diff --git a/App/apps/aprsrx/README.md b/App/apps/aprsrx/README.md
new file mode 100644
index 00000000..223699ae
--- /dev/null
+++ b/App/apps/aprsrx/README.md
@@ -0,0 +1,156 @@
+# APRS RX: on-radio APRS receiver (work in progress)
+
+Goal: an overlay app that receives APRS (AX.25 UI frames, Bell 202 AFSK 1200
+bauds) on the UV-K1 / UV-K5 v3 and shows the last frame, then an APRS TX app.
+
+Status:
+
+| Step | State |
+|---|---|
+| Hardware demodulation by the BK4829 FSK block | **Dead end** (2026-09-25, FT3D on 144.800: the chip has no Bell 202 demodulator) |
+| Audio path an app can sample | **Done** by EPIRB 406: RX audio on PA4, ADC channel 4 at 9.6 kHz |
+| Integer demodulator, modelled on synthetic audio (`test/model_rx.py`) | **Done** (see below) |
+| Flipper Zero test transmitter (`test/flipper_aprs.py`) | **Done**, files in `test/flipper/` |
+| Radio app (`aprsrx_app.c`) | **v0.1 receives the Flipper frames on the radio**; v0.3 decodes Mic-E (on air: F5RAV via F1PRY-14); v0.4 decodes continuously with 3 slicers (on air: F1PRY-14 via F5KTR-3); v0.5 shows standard positions, the frequency bottom right as Beacon, drops `pp` and the UP/DOWN/5 tuning offset to fit 4 KiB (builds: 3976 B, 120 B free; radio test pending) |
+| Bench test with the Flipper on 433.650 MHz | **Done** (2026-09-30, v0.1: `_long` 10/10 in STD; `_badfcs` not shown) |
+| Real station: FT3D beacon on 144.800 MHz | **Done** (2026-09-30, v0.1: Mic-E frame `>TXUPX9` received, FCS good, = 48°50.89' N 2°16.25' E) |
+| Mic-E decoding (`test/mice.py`: spec encoder vs the app's decoder) | **Done** in the model: 6 cases + the FT3D frame |
+
+## Using the app
+
+1. Set the VFO to the APRS frequency, **FM**: 144.800 MHz, or 433.650 MHz for the
+   Flipper test files.
+2. Launch **APRS RX**.
+3. Lower the volume: the RX audio must stay on (it is what reaches PA4), so the
+   speaker plays the channel.
+
+Since v0.4 the app decodes **continuously**, as a TNC does: no RSSI trigger,
+the FCS and a UI-frame check (control 0x03, PID 0xF0) sort frames from noise.
+Up to v0.3, captures started 10 dB above a tracked noise floor; on a busy
+144.800 that floor crept up (−132 → −104 dBm), so weak stations were never
+sampled. Several frames in one transmission are now received too.
+
+Keys and the screen cost sample time (the key scan alone is ~400 µs), so they
+are served every 50 ms only while no slicer is inside a preamble (two
+back-to-back flags) or a frame whose first bytes look like a callsign (busy
+~4 % of the time on noise, in the model), and after 3 s of busy at the latest.
+The screen is redrawn after a new frame, a key, or every 5 s.
+
+| Screen | Content |
+|---|---|
+| Status bar | `APRS RX` title, then a `WAIT` capsule until the first frame |
+| Line 0 | Source call and frame number, e.g. `F4HWN-7 #3` |
+| Tiny row y=8 | `>DEST,DIGI*,...` (as many path entries as fit on one row) |
+| Tiny rows y=13/19/25 | Info field, 3 × 32 characters (non-ASCII shown as `.`); for Mic-E (most Yaesu/Kenwood beacons, v0.3): position `48 50.89N 002 16.25E`, then speed km/h, course, symbol and message type (`Off Duty`, `En Route`...), then altitude and comment without the device markers; for an uncompressed position (`!` `=` `/` `@`, v0.5): position, then the timestamp if any, the symbol (table + code) and the comment over two rows. Compressed positions stay raw text |
+| Lines 4-5 | Under a dotted separator (y=30), the frequency drawn as the main screen draws it (big digits up to the kHz, the last two in the small font), centred; same code as APRS TX |
+| Bottom row y=49 | `ok 12  -89dBm  sl 5/12/7`: frames received, RSSI at the end of the last frame, frames per slicer (space-favouring / neutral / mark-favouring; a frame found by several slicers counts in each, but once in `ok`) |
+
+Keys (UV-K5 and UV-K1):
+
+| Key | Action |
+|---|---|
+| MENU | Clear the last frame and the counters |
+| EXIT | Quit |
+
+The receive path is the firmware's own (STD: 300 Hz high-pass, de-emphasis,
+3 kHz low-pass). Up to v0.3, key 1 switched to RAW (filters and AFC off, as
+EPIRB 406); every on-air decode was made in STD and the model shows no gain
+for RAW, so v0.4 dropped it to fit the 4 KiB overlay.
+
+The last good frame is kept on `app_main`'s stack and the demodulator state on
+`capture`'s: the 4 KiB overlay also holds `.bss`. The screen texts and the two
+cos tables are assets.
+
+## Demodulator (`test/model_rx.py`, class `Demod`; the C is a transcription)
+
+Per ADC sample (9.6 kHz, 8 samples per bit):
+
+1. DC removal (1-pole tracker, 64 samples).
+2. Band-pass biquad centred on √(1200·2200) = 1625 Hz, Q 0.9 (Q14): equal gain
+   on both tones, removes the out-of-band noise the box correlators let through.
+3. Four sliding correlators over one bit: I/Q at 1200 Hz (8-entry cos table) and
+   2200 Hz (48 entries = 11 cycles). The sine is the cos table read 3/4 period
+   ahead (+6, +12). Products `>> 8`, so the decision below never overflows int32.
+4. Magnitudes `max + 3/8 min`, per-tone peak trackers (attack 1/32, decay
+   1/1024): each tone normalised by its own peak, so the twist (pre-emphasis or
+   not, de-emphasis or not) does not bias the decision much.
+5. **3 slicers** (since v0.4), decision `sign(wa·Mm·Ps − wb·Ms·Pm)` with
+   wa:wb = 2:3, 1:1, 3:2, each with its own DPLL, NRZI and HDLC below (Direwolf's
+   multi-slicer idea): the AGC does not cancel a strong twist in noise. A frame
+   from any slicer is accepted; a copy from another slicer within 1 s is dropped.
+6. DPLL: 65536 per bit, a bit at each wrap; each transition pulls the phase 1/4 of
+   the way toward mid-bit + half a sample (the transition is only seen at the
+   next sample: without that half-sample, a +1 % clock failed long frames).
+7. NRZI, HDLC (flag, destuffing, abort after 7 ones), CRC-16/X.25 per byte,
+   frame accepted on the residue 0xF0B8 **and** as a UI frame: noise brings ~0.7
+   candidates per second to the FCS check, so without the UI check a false frame
+   would pass about once a day.
+
+### Slicers (`test/variants.py`, 4 seeds, 24 hard cases: noise 3000-4000 Hz, ±1 % clock, twist −9 to +9 dB at noise 2500 Hz, RAW and STD)
+
+| Variant | Frames /96 |
+|---|---|
+| 1 slicer (v0.1-v0.3) | 57 |
+| 3 slicers, weights ×2 | 65 |
+| **3 slicers, weights ×1.5 (v0.4)** | **71** |
+| 5 slicers (×1.5 and ×2) | 71 |
+
+The gain is on strong twist: sine AFSK at +6 / +9 dB in RAW goes from 0/4 to 4/4.
+Noise only (30 s, 2 seeds, 50 and 400 LSB rms): no frame accepted.
+
+### Model results (`test/model_rx.py`, 3 seeds per case, 1 slicer; 3 slicers: all ≥ these)
+
+Channel: discriminator output + white noise (rms over 48 kHz) → radio audio path
+(RAW: 5 kHz low-pass; STD: 300 Hz high-pass, 750 µs de-emphasis, 3 kHz low-pass)
+→ 12-bit ADC at 9.6 kHz, 0.065 LSB/Hz (EPIRB 406 measurement), optional clock
+error. 150 ms of no-carrier noise before and after each burst.
+
+| Case | RAW | STD |
+|---|---|---|
+| Flipper, clean: `pos`, `long` (233 bytes) | 3/3, 3/3 | 3/3, 3/3 |
+| Flipper `badfcs` (must be rejected) | 0 frames | 0 frames |
+| Flipper, noise 1500 / 3000 / 4500 Hz | 3/3, 2/3, 0/3 | 3/3, 2/3, 0/3 |
+| Flipper, ±4 kHz carrier offset | 3/3 | 3/3 |
+| Flipper `long`, ±1 % sample clock | 3/3 | 3/3 (−1 %), 3/3 (+1 %) |
+| Sine AFSK (a real station), twist −6 / 0 / +6 dB, noise 1500 | 3/3, 3/3, 2/3 | 2/3, 3/3, 3/3 |
+
+Noise 4500 Hz is Eb/N0 ≈ 9.6 dB: the theoretical frame success of non-coherent
+FSK on a 520-bit frame is then ~6 %, so the failures there are expected.
+(At ±0.5 % clock, 6/6 in every variant tried.)
+
+## Flipper Zero test transmitter (`test/flipper_aprs.py`)
+
+The Flipper's CC1101 cannot put an audio tone on FM, only switch between two
+frequencies (preset `2FSKDev238Async`, ±2.38 kHz). Each AFSK tone is therefore
+sent as a square wave: the carrier toggles at twice the tone frequency,
+phase-continuous across bits, with edge times rounded from exact values (no
+drift). The receiver's discriminator outputs that square wave and its audio
+low-pass leaves mostly the fundamental. The Flipper cannot reach 2 m anyway; the
+script refuses 144-146 MHz.
+
+```
+test/flipper_aprs.py test/flipper [--call F4HWN] [--freq 433650000]
+```
+
+writes `aprs_pos.sub`, `_digi`, `_msg`, `_status`, `_long` (233 bytes, 2 s) and
+`_badfcs` (one info bit flipped: must not be shown). 100 ms of carrier, 40 flags
+(267 ms), the frame, 3 flags, 10 ms of carrier. Copy them to `subghz/` on the
+Flipper, set the radio to 433.650 MHz FM, launch the app, then Send one file at
+a time, about 1 s apart. (Up to v0.4, UP/DOWN tuned ±5 kHz for a Flipper whose
+crystal puts the carrier off the channel; never needed on the bench, dropped in
+v0.5 to fit 4 KiB.)
+
+`test/ax25.py` builds the frames (shared by the generator and the model);
+`test/mice.py` checks the Mic-E display decoder against a spec encoder, and
+the standard position display against real frames;
+`test/variants.py` compares demodulator variants on the hard cases (dev tool).
+
+## Bench checklist
+
+- Level reaching the ADC (`pp`, shown up to v0.4, dropped in v0.5 to make
+  room): estimated ~300 LSB peak-to-peak for the Flipper (±2.38 kHz at
+  0.065 LSB/Hz), **measured 734-778** with the Flipper and **916** with a real
+  station (F1PRY-14): ~20 % of full scale, plenty of headroom, and the per-tone
+  AGC makes the absolute level irrelevant.
+- The per-slicer counters show which decision threshold the stations need: if
+  one outer slicer does most of the work, the twist of the path is off-centre.
diff --git a/App/apps/aprsrx/app.ld b/App/apps/aprsrx/app.ld
new file mode 100644
index 00000000..4a4525de
--- /dev/null
+++ b/App/apps/aprsrx/app.ld
@@ -0,0 +1,43 @@
+/* Overlay-app link script (POC).
+ *
+ * The blob is linked to run at the PY25Q16 sector-cache overlay VMA (shared with
+ * the multiboot RAM stub — never both active at once). Code + rodata + data +
+ * bss must all fit in the 4 KiB overlay. objcopy -O binary emits text+rodata+
+ * data only; the loader zeroes the overlay before copying, so bss starts clean.
+ *
+ * VMA must match ADDR(.mb_workspace) in Core/py32f071xb.ld. If the firmware RAM
+ * layout shifts, update APP_VMA and the loader's compile-time assert catches a
+ * mismatch. */
+
+/* APP_VMA is the target firmware's __mb_workspace_start (read from its .map). It
+ * varies with the RAM layout, so pass it from the build: -Wl,--defsym,APP_VMA=0x...
+ * The default is only a fallback for a standalone size check. */
+APP_VMA    = DEFINED(APP_VMA) ? APP_VMA : 0x20000280;
+APP_LENGTH = 0x1000;       /* 4 KiB sector-cache overlay                        */
+
+ENTRY(app_main)
+
+MEMORY {
+    APP (rwx) : ORIGIN = APP_VMA, LENGTH = APP_LENGTH
+}
+
+SECTIONS {
+    .app APP_VMA : {
+        KEEP(*(.text.entry))      /* app_main pinned to offset 0 */
+        *(.text .text.*)
+        *(.rodata .rodata.*)
+        . = ALIGN(4);
+        *(.data .data.*)
+        . = ALIGN(4);
+        __app_bss_start = .;
+        *(.bss .bss.* COMMON)
+        . = ALIGN(4);
+        __app_bss_end = .;
+    } > APP
+
+    __app_end = .;
+    ASSERT(__app_end <= APP_VMA + APP_LENGTH,
+           "APRS RX overlay app overflows the 4 KiB overlay")
+
+    /DISCARD/ : { *(.ARM.exidx*) *(.ARM.extab*) *(.eh_frame*) *(.comment) *(.note.*) }
+}
diff --git a/App/apps/aprsrx/aprsrx_app.c b/App/apps/aprsrx/aprsrx_app.c
new file mode 100644
index 00000000..dda33871
--- /dev/null
+++ b/App/apps/aprsrx/aprsrx_app.c
@@ -0,0 +1,625 @@
+/* Copyright 2026 Armel F4HWN
+ * https://github.com/armel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+/*
+ * APRS RX - receives APRS (AX.25 UI frames, Bell 202 AFSK 1200 bauds) in
+ * software and shows the last frame: source, destination and path, the info
+ * field. Tune the VFO (FM; 144.800 MHz, or 433.650 MHz for the Flipper Zero
+ * bench files of test/flipper_aprs.py), then launch.
+ *
+ * The BK4829 has no Bell 202 demodulator (see README.md), so the RX audio is
+ * sampled as EPIRB 406 does: it reaches PA4 (the voice DAC pin), held at
+ * mid-scale by the MCU DAC (unbuffered), and is read on ADC channel 4 at
+ * 9.6 kHz, timed from SysTick, continuously, as a TNC does: no RSSI gate, the
+ * FCS and the UI check sort frames from noise. Each sample goes through the
+ * demodulator modelled and tested in test/model_rx.py: band-pass, 1200/2200 Hz
+ * sliding correlators over one bit, per-tone AGC, then 3 slicers (mark/space
+ * weights 2:3, 1:1, 3:2), each with its DPLL, NRZI, HDLC and FCS. Keep the two
+ * in step.
+ * Keys and the screen cost sample time (the key scan alone is ~400 us), so they
+ * are served every 50 ms only while no slicer is inside a preamble or a
+ * plausible frame; the redraw follows a new frame, a key, or every 5 s.
+ *
+ * Keys (UV-K5 and UV-K1): MENU clear · EXIT quit. The speaker plays the
+ *   channel: lower the volume.
+ * The loader re-runs RADIO_SetupRegisters on exit; the app restores the ADC,
+ * PA4, the DAC and its clock itself.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "../app_api.h"
+#include "aprsrx_assets.h"     /* generated by gen_assets.py */
+
+/* ---- MCU registers (PY32F071, core and SysTick at 48 MHz, 10 ms period) ---- */
+#define SYST_LOAD   (*(volatile uint32_t *)0xE000E014u)
+#define SYST_VAL    (*(volatile uint32_t *)0xE000E018u)
+#define ADC_SR      (*(volatile uint32_t *)0x40012400u)
+#define ADC_CR2     (*(volatile uint32_t *)0x40012408u)
+#define ADC_SMPR3   (*(volatile uint32_t *)0x40012414u)
+#define ADC_SQR3    (*(volatile uint32_t *)0x40012438u)
+#define ADC_DR      (*(volatile uint32_t *)0x40012450u)
+#define GPIOA_MODER (*(volatile uint32_t *)0x50000000u)
+#define DAC_CR      (*(volatile uint32_t *)0x40007400u)
+#define DAC_SWTRIGR (*(volatile uint32_t *)0x40007404u)
+#define DAC_DHR12R1 (*(volatile uint32_t *)0x40007408u)
+#define RCC_APBENR1 (*(volatile uint32_t *)0x4002103Cu)
+#define RCC_DACEN   (1u << 29)
+/* DAC channel 1 on, output buffer off, software trigger (TSEL1 = 111) */
+#define DAC_CR_BIAS ((1u << 0) | (1u << 1) | (1u << 2) | (7u << 3))
+#define BIAS_CODE   2048u
+#define ADC_SR_EOC     (1u << 1)
+#define ADC_CR2_START  ((1u << 22) | (1u << 20))   /* SWSTART | EXTTRIG */
+#define SMP8_POS       24u
+#define SMP4_POS       12u
+#define ADC_CH_PA4     4u
+#define FS             9600u
+#define CYC_PER_SAMPLE (48000000u / FS)            /* 5000 */
+#define HOUSE_EVERY    480u    /* samples between key/screen slots (50 ms)       */
+#define BUSY_MAX       60u     /* serve them anyway after 60 busy slots (3 s)    */
+#define REFRESH_MS     5000u   /* periodic redraw (battery)                      */
+#define DUP_MS         1000u   /* the same frame from another slicer             */
+
+/* ---- BK4829 ---- */
+
+/* ---- demodulator (test/model_rx.py, class Demod) ---- */
+#define BP_B0       5356   /* band-pass 1625 Hz, Q 0.9, Q14 (b2 = -b0, b1 = 0) */
+#define BP_A1     (-10714)
+#define BP_A2       5673
+#define AGC_ATT     5      /* peak tracker: attack 1/32 ...                 */
+#define AGC_DEC     10     /* ... decay 1/1024 per sample                   */
+#define PK_MIN      16
+#define PLL_STEP    8192   /* 65536 per bit / 8 samples per bit             */
+#define PLL_CTR     36864  /* transitions pulled to mid-bit + half a sample */
+#define PLL_SHIFT   2      /* 1/4 of the error per transition               */
+#define NSL         3      /* slicers                                       */
+#define PRE_BITS    24u    /* busy for 3 bytes after two back-to-back flags */
+
+/* ---- AX.25 ---- */
+#define FRAME_MAX   330u   /* 10 addresses + control + PID + 256 info + FCS */
+#define FRAME_MIN   18u    /* 2 addresses + control + PID + FCS              */
+#define FCS_GOOD    0xF0B8u
+#define COUNT_MAX   999u   /* counters stop here: the stats row stays within 32 tiny chars */
+
+/* the front end shared by the slicers */
+typedef struct {
+    int32_t  dc;                       /* DC tracker, Q4                          */
+    int32_t  x1, x2, y1, y2;           /* band-pass state                         */
+    int32_t  im, qm, is, qs;           /* sliding correlator sums                 */
+    int32_t  pm, ps;                   /* per-tone magnitude peaks (AGC)          */
+    int16_t  ring[8][4];               /* the products of the last bit            */
+    uint8_t  r, km, ks;                /* ring slot, table phases                 */
+    int8_t   cm[8], cs[48];            /* cos tables (assets)                     */
+} dem_t;
+
+/* one slicer: decision weights, DPLL, NRZI, HDLC */
+typedef struct {
+    int32_t  dprev, phase;             /* last decision, DPLL phase (65536/bit)   */
+    uint16_t n, crc;                   /* bytes, running FCS                      */
+    uint8_t  wa, wb, last;             /* mark/space weights, last level          */
+    uint8_t  sr, ones, byte, nb;       /* HDLC: shift reg, 1 run, byte, bit count */
+    uint8_t  inframe, hdr;             /* between flags, first bytes look like a call */
+    uint8_t  bits, pre;                /* bits since the last flag, back-to-back flags */
+    uint8_t  buf[FRAME_MAX];
+} sl_t;
+
+/* The app state in one struct: a function loads one base address instead of one
+ * literal-pool word per global. Words, then bytes, then halfwords, so every field
+ * stays within the Thumb load/store immediate ranges (ldrb <= 31, ldrh <= 62,
+ * ldr <= 124). The loader zeroes the overlay (.bss) at every launch. */
+static struct {
+    const app_api_t *A;
+    uint8_t *frm;                      /* last good frame (app_main's stack)      */
+    uint32_t vfoFreq;                  /* VFO RX frequency at launch, 10 Hz units */
+    uint32_t tPrev, tCyc;              /* SysTick cycle counter                   */
+    uint32_t tFrame, tDraw;            /* ticks_ms of the last frame, last redraw */
+    uint32_t savedSqr3, savedSmpr3, savedModer, savedDac, savedRcc, savedDhr;
+    uint8_t  seq, prevKey, redraw;
+    bool     running;
+    int16_t  rssi;                     /* RSSI at the end of the last frame       */
+    uint16_t flen, nOk;                /* frame length, frames                    */
+    uint16_t good[NSL];                /* frames per slicer (duplicates included) */
+} g;
+static char str[34];
+
+/* ---- tiny freestanding helpers: GCC may turn the zeroing / copy loops into calls ---- */
+void *memset(void *d, int c, size_t n) {
+    uint8_t *p = d; while (n--) *p++ = (uint8_t)c; return d;
+}
+void *memcpy(void *d, const void *s, size_t n) {
+    uint8_t *p = d; const uint8_t *q = s; while (n--) *p++ = *q++; return d;
+}
+
+/* ---- formatting ---- */
+static char *put(char *o,const char *s){ while(*s)*o++=*s++; return o; }
+/* Formatting by repeated subtraction: no division. Values printed stay below 100000. */
+static uint8_t sub(uint32_t *v,uint32_t d){ uint8_t q=0; while(*v>=d){ *v-=d; q++; } return q; }
+static const uint16_t P10[]={10000u,1000u,100u,10u,1u};
+static char *puti(char *o,int32_t v){
+    uint32_t u;
+    if(v<0){*o++='-';u=(uint32_t)(-v);} else u=(uint32_t)v;
+    bool lead=false;
+    for(uint8_t i=0;i<5;i++){
+        uint8_t c=sub(&u,P10[i]);
+        if(c||lead||i==4u){ *o++=(char)('0'+c); lead=true; }
+    }
+    return o;
+}
+/* A tiny row holds 32 characters (4 px each): print_tiny does not clip, so
+ * every row built below stays within that. */
+static void tiny(uint8_t y,char *end){ *end='\0'; g.A->print_tiny(str,0,y,false,true); }
+
+#define WAIT_CAPS_X 40u    /* "WAIT" capsule in the status bar, after the title */
+
+/* Tiny rows under the source line: the path (capitals and digits: no
+ * descenders), then 3 info rows 6 px apart (the 3x5 font is 5 px, 6 with
+ * descenders), ending at y = 29 above the separator (y = 30). */
+#define Y_PATH      8u
+#define Y_INFO      13u
+#define ROW_STEP    6u
+
+/* The frequency (10 Hz units) drawn as the main screen draws it (ui/main.c,
+ * ENABLE_BIG_FREQ): the big digits up to the kHz on lines 4-5, the last two
+ * digits in the small font on line 5 right after them (from 1 GHz, the whole
+ * string in the big font), the group centred. Big digits are 13 px (drawn from
+ * +2), the point 3 px: the group shows (n big digits x 13 + 14) px. No division.
+ * Same code as APRS TX. */
+static void drawFreq(uint32_t f){
+    const app_api_t *A=g.A;
+    uint16_t m=0;
+    while(f>=100000u){ f-=100000u; m++; }
+    char *o=puti(str,m);
+    *o++='.';
+    for(uint8_t i=0;i<5u;i++) *o++=(char)('0'+sub(&f,P10[i]));
+    *o='\0';
+    uint8_t n=(uint8_t)(o-str), big=(uint8_t)(n-3u);    /* digits before "00" */
+    if(m>=1000u){ A->print_string(str,(uint8_t)((128u-n*8u)>>1),0,4,8); return; }
+    uint8_t x=(uint8_t)(((128u-(big*13u+14u))>>1)-2u);
+    A->print_normal(str+n-2u,(uint8_t)(x+big*13u+3u),0,5);   /* "00"      */
+    str[n-2u]='\0';
+    A->display_freq(str,x,4,false);                          /* "144.800" */
+}
+
+/* ---- SysTick cycle counter (call at least every 10 ms; wraps every 89 s,
+ * so compare with a signed difference) ---- */
+static void clkStart(void){ g.tPrev=SYST_VAL; g.tCyc=0; }
+static uint32_t clkCyc(void){
+    uint32_t v=SYST_VAL;
+    g.tCyc += (v<=g.tPrev) ? g.tPrev-v : g.tPrev+(SYST_LOAD+1u-v);
+    g.tPrev=v;
+    return g.tCyc;
+}
+
+/* ---- PA4 bias: the pin has no DC reference of its own (AC-coupled audio); the
+ * MCU DAC on PA4, output buffer off, at mid-scale, holds it at ~VDD/2.
+ * Set for the whole run, restored on exit (see EPIRB 406). ---- */
+static void biasOn(void){
+    GPIOA_MODER=g.savedModer|(3u<<8);           /* PA4 analog                     */
+    RCC_APBENR1=g.savedRcc|RCC_DACEN;
+    DAC_CR=DAC_CR_BIAS;
+    DAC_DHR12R1=BIAS_CODE;
+    DAC_SWTRIGR=1u;                           /* DHR -> DOR                     */
+}
+static void biasOff(void){ DAC_CR=g.savedDac; DAC_DHR12R1=g.savedDhr; RCC_APBENR1=g.savedRcc; GPIOA_MODER=g.savedModer; }
+
+/* ---- ADC on PA4 (channel 4); channel 8 (battery) restored afterwards ---- */
+static void adcSelPA4(void){
+    ADC_SMPR3=(g.savedSmpr3&~(7u<<SMP4_POS))|(((g.savedSmpr3>>SMP8_POS)&7u)<<SMP4_POS);
+    ADC_SQR3=(g.savedSqr3&~0x1Fu)|ADC_CH_PA4;
+}
+static void adcRestore(void){ ADC_SQR3=g.savedSqr3; ADC_SMPR3=g.savedSmpr3; }
+static uint16_t adcRead(void){
+    ADC_CR2|=ADC_CR2_START;
+    for(uint16_t n=0; !(ADC_SR&ADC_SR_EOC) && n<2000u; n++){}
+    return (uint16_t)(ADC_DR&0x0FFFu);
+}
+
+static bool callChar(uint8_t c){ return (c>='A'&&c<='Z')||(c>='0'&&c<='9')||c==' '; }
+
+/* An APRS frame is a UI frame: the address field ends (bit 0 of an SSID byte)
+ * and is followed by control 0x03 and PID 0xF0. Rejects the noise burst that
+ * passes the 16-bit FCS about once a day in continuous decoding. */
+static bool isUI(const uint8_t *f,uint16_t n){
+    uint16_t end=(uint16_t)(n-2u), e=13;
+    while(!(f[e]&1u) && e+7u<end) e+=7;
+    return (f[e]&1u) && e+2u<end && f[e+1]==0x03u && f[e+2]==0xF0u;
+}
+
+/* ---- HDLC: one bit after NRZI. True when a UI frame with a good FCS just
+ * ended (m->buf, m->n bytes, until the next byte). ---- */
+static bool hdlcBit(sl_t *m,uint8_t b){
+    if(m->bits<255u) m->bits++;
+    m->sr=(uint8_t)((m->sr>>1)|(b<<7));
+    if(m->sr==0x7Eu){
+        bool ok = m->inframe && m->n>=FRAME_MIN && m->crc==FCS_GOOD && isUI(m->buf,m->n);
+        m->pre = m->bits==8u ? (uint8_t)(m->pre<255u?m->pre+1u:255u) : 0;
+        m->bits=0;
+        if(ok) return true;                   /* n kept for the caller, reset below */
+        m->inframe=1; m->hdr=1; m->n=0; m->crc=0xFFFFu;
+        m->ones=m->byte=m->nb=0;
+        return false;
+    }
+    if(b){
+        if(++m->ones>6u){ m->ones=7; m->inframe=0; return false; }   /* abort / noise */
+    } else {
+        if(m->ones==5u){ m->ones=0; return false; }                 /* stuffed zero  */
+        m->ones=0;
+    }
+    if(!m->inframe) return false;
+    m->byte|=(uint8_t)(b<<m->nb);
+    if(++m->nb==8u){
+        if(m->n<FRAME_MAX){
+            uint16_t c=m->crc^m->byte;        /* CRC-16/X.25, reflected 0x1021 */
+            for(uint8_t i=0;i<8u;i++) c=(c&1u)?(uint16_t)((c>>1)^0x8408u):(uint16_t)(c>>1);
+            m->crc=c;
+            if(m->n<6u && ((m->byte&1u) || !callChar((uint8_t)(m->byte>>1)))) m->hdr=0;
+            m->buf[m->n++]=m->byte;
+        } else m->inframe=0;
+        m->byte=m->nb=0;
+    }
+    return false;
+}
+
+/* A slicer is busy inside a preamble (two back-to-back flags, then 3 bytes) or
+ * a frame whose first bytes look like a callsign: noise is busy ~4 % of the time. */
+static bool busy(const sl_t *m){
+    return (m->pre && m->bits<PRE_BITS) || (m->inframe && m->n && m->hdr);
+}
+
+/* |(i, q)| ~ max + 3/8 min */
+static int32_t mag(int32_t i,int32_t q){
+    if(i<0) i=-i;
+    if(q<0) q=-q;
+    if(i<q){ int32_t t=i; i=q; q=t; }
+    return i+(q>>2)+(q>>3);
+}
+
+/* ---- front end, one ADC sample: *a = Mm*Ps, *b = Ms*Pm (each tone over its
+ * own peak, without division; both stay below ~2^21) ---- */
+static void front(dem_t *m,int32_t adc,int32_t *a,int32_t *b){
+    m->dc+=((adc<<4)-m->dc)>>6;
+    int32_t x=adc-(m->dc>>4);
+    int32_t y=(BP_B0*(x-m->x2)-BP_A1*m->y1-BP_A2*m->y2)>>14;
+    m->x2=m->x1; m->x1=x; m->y2=m->y1; m->y1=y;
+
+    /* sliding correlators over one bit; the sine is the cos table 3/4 period ahead */
+    int16_t *o=m->ring[m->r];
+    uint8_t k=(uint8_t)(m->ks+12u); if(k>=48u) k-=48u;
+    int32_t p;
+    p=(y*m->cm[m->km])>>8;              m->im+=p-o[0]; o[0]=(int16_t)p;
+    p=(y*m->cm[(m->km+6u)&7u])>>8;      m->qm+=p-o[1]; o[1]=(int16_t)p;
+    p=(y*m->cs[m->ks])>>8;              m->is+=p-o[2]; o[2]=(int16_t)p;
+    p=(y*m->cs[k])>>8;                  m->qs+=p-o[3]; o[3]=(int16_t)p;
+    m->r=(uint8_t)((m->r+1u)&7u);
+    m->km=(uint8_t)((m->km+1u)&7u);
+    if(++m->ks>=48u) m->ks=0;
+
+    int32_t mm=mag(m->im,m->qm), ms=mag(m->is,m->qs);
+    m->pm+= mm>m->pm ? (mm-m->pm)>>AGC_ATT : -(m->pm>>AGC_DEC);
+    m->ps+= ms>m->ps ? (ms-m->ps)>>AGC_ATT : -(m->ps>>AGC_DEC);
+    if(m->pm<PK_MIN) m->pm=PK_MIN;
+    if(m->ps<PK_MIN) m->ps=PK_MIN;
+    *a=mm*m->ps;
+    *b=ms*m->pm;
+}
+
+/* ---- slicer: decision sign(wa*a - wb*b), DPLL, NRZI, HDLC ---- */
+static bool slice(sl_t *m,int32_t a,int32_t b){
+    int32_t d=a*m->wa-b*m->wb;
+    /* DPLL: a bit at each phase wrap (mid-bit), transitions pulled to mid-phase */
+    m->phase+=PLL_STEP;
+    if((d>0)!=(m->dprev>0)) m->phase+=(PLL_CTR-m->phase)>>PLL_SHIFT;
+    m->dprev=d;
+    if(m->phase>=65536){
+        m->phase-=65536;
+        uint8_t lv=d>0;
+        bool r=hdlcBit(m,lv==m->last);    /* NRZI: no change = 1 */
+        m->last=lv;
+        return r;
+    }
+    return false;
+}
+
+/* ---- a good frame from slicer k: shown unless another slicer just gave it ---- */
+static void accept(sl_t *m,uint8_t k){
+    const app_api_t *A=g.A;
+    uint16_t n=m->n;
+    uint32_t t=A->ticks_ms();
+    if(g.good[k]<COUNT_MAX) g.good[k]++;
+    if(!(n==g.flen && g.frm[n-1]==m->buf[n-1] && g.frm[n-2]==m->buf[n-2]
+         && t-g.tFrame<DUP_MS)){
+        memcpy(g.frm,m->buf,n);
+        g.flen=n;
+        if(g.nOk<COUNT_MAX) g.nOk++;
+        g.seq++;
+        g.rssi=A->rssi_dbm();              /* the carrier is still up: closing flags */
+        g.redraw=1;
+    }
+    g.tFrame=t;
+    m->inframe=1; m->hdr=1; m->n=0; m->crc=0xFFFFu;   /* this flag opens the next frame */
+    m->ones=m->byte=m->nb=0;
+}
+
+/* ---- AX.25 address field -> "F4HWN-7" ---- */
+static char *putCall(char *o,const uint8_t *a){
+    for(uint8_t i=0;i<6u;i++){ char c=(char)(a[i]>>1); if(c!=' ') *o++=c; }
+    uint8_t ssid=(uint8_t)((a[6]>>1)&15u);
+    if(ssid){ *o++='-'; o=puti(o,ssid); }
+    return o;
+}
+
+/* The tiny font covers 0x20-0x7F: anything else shows as '.'. */
+static char safe(uint8_t ch){ return (ch<0x20u||ch>0x7Eu)?'.':(char)ch; }
+
+/* Info bytes f[i..end) on one tiny row from o (up to 32 characters); returns
+ * the next byte. */
+static uint16_t textRow(char *o,const uint8_t *f,uint16_t i,uint16_t end,uint8_t y){
+    for(; o<str+32 && i<end; i++) *o++=safe(f[i]);
+    tiny(y,o);
+    return i;
+}
+
+/* ---- Mic-E (APRS 1.0.1 chapter 10; test/mice.py is the reference) ----
+ * The latitude, N/S, the longitude +100 offset, E/W and the message bits are in
+ * the destination address; the longitude, speed, course and symbol in the info
+ * field. Byte arithmetic wraps as uint8, so a bad field prints junk, never loops. */
+static char *put2(char *o,uint32_t v){ *o++=(char)('0'+sub(&v,10u)); *o++=(char)('0'+v); return o; }
+static char *put3(char *o,uint32_t v){ *o++=(char)('0'+sub(&v,100u)); return put2(o,v); }
+static uint8_t micDigit(uint8_t c){
+    if(c>='0'&&c<='9') return (uint8_t)(c-'0');
+    if(c>='A'&&c<='J') return (uint8_t)(c-'A');
+    if(c>='P'&&c<='Y') return (uint8_t)(c-'P');
+    return 0;                                 /* K, L, Z: position ambiguity */
+}
+static bool micBit(uint8_t c){ return c>='P' || (c>='A'&&c<='K'); }
+static bool micType(uint8_t t){ return t=='`'||t=='\''||t==0x1Cu||t==0x1Du; }
+
+static void drawMicE(const uint8_t *f,uint16_t i,uint16_t end,const char *s){
+    const app_api_t *A=g.A;
+    uint8_t c[6];
+    for(uint8_t k=0;k<6u;k++) c[k]=(uint8_t)(f[k]>>1);
+
+    /* "48 50.89N 002 16.25E" */
+    char *o=str;
+    for(uint8_t k=0;k<6u;k++){
+        *o++=(char)('0'+micDigit(c[k]));
+        if(k==1u) *o++=' ';
+        if(k==3u) *o++='.';
+    }
+    *o++=micBit(c[3])?'N':'S';
+    uint32_t deg=(uint8_t)(f[i+1]-28u);
+    if(micBit(c[4])) deg+=100u;
+    if(deg>=180u && deg<=189u) deg-=80u;
+    else if(deg>=190u && deg<=199u) deg-=190u;
+    uint32_t mn=(uint8_t)(f[i+2]-28u);
+    if(mn>=60u) mn-=60u;
+    *o++=' '; o=put3(o,deg); *o++=' '; o=put2(o,mn); *o++='.'; o=put2(o,(uint8_t)(f[i+3]-28u));
+    *o++=micBit(c[5])?'W':'E';
+    tiny(Y_INFO,o);
+
+    /* "12km/h 245 [/ En Route": speed in knots x 1.8525 (1897/1024) */
+    uint32_t dc=(uint8_t)(f[i+5]-28u);
+    uint32_t sp=(uint32_t)(uint8_t)(f[i+4]-28u)*10u+sub(&dc,10u);
+    uint32_t crs=dc*100u+(uint8_t)(f[i+6]-28u);
+    if(sp>=800u) sp-=800u;
+    if(crs>=400u) crs-=400u;
+    o=puti(str,(int32_t)((sp*1897u)>>10)); o=put(o,s+T_KMH);
+    o=puti(o,(int32_t)crs); *o++=' ';
+    *o++=safe(f[i+7]); *o++=safe(f[i+8]); *o++=' ';
+    uint8_t idx=(uint8_t)(micBit(c[0])*4u+micBit(c[1])*2u+micBit(c[2]));
+    bool custom=false;
+    for(uint8_t k=0;k<3u;k++) if(c[k]>='A'&&c[k]<='K') custom=true;
+    if(custom && idx){ o=put(o,s+T_CUSTOM); *o++=(char)('0'+7u-idx); }
+    else o+=A->asset_read((uint16_t)(T_MSG+idx*T_MSG_STRIDE),o,T_MSG_STRIDE); /* NUL-padded */
+    tiny(Y_INFO+ROW_STEP,o);
+
+    /* comment: trailing CR/LF, the device markers (Yaesu/other: '`' or '\'' +
+     * text + 2 chars; Kenwood: '>' or ']' + text [+ '=' or '^']) and a leading
+     * "xxx}" altitude (base 91, metres + 10000) */
+    uint16_t j=(uint16_t)(i+9u);
+    while(end>j && (f[end-1]=='\r'||f[end-1]=='\n')) end--;
+    if(j<end){
+        uint8_t m=f[j];
+        if(m=='`'||m=='\''){ j++; if(end-j>=2) end-=2u; }
+        else if(m=='>'||m==']'){ j++; if(end>j && (f[end-1]=='='||f[end-1]=='^')) end--; }
+    }
+    o=str;
+    if(end-j>=4 && f[j+3]=='}'){
+        int32_t alt=(((int32_t)f[j]-33)*91+((int32_t)f[j+1]-33))*91+((int32_t)f[j+2]-33)-10000;
+        o=puti(o,alt); *o++='m'; *o++=' ';
+        j+=4u;
+    }
+    textRow(o,f,j,end,Y_INFO+2u*ROW_STEP);
+}
+
+/* ---- uncompressed position ('!' '=' or, after a 7-character timestamp, '/'
+ * '@'; test/mice.py draw_pos is the reference): "49 21.07N 001 50.50E", then
+ * the timestamp, the symbol and the comment. False for anything else (compressed
+ * positions included), which is then shown as raw text. ---- */
+static bool drawPos(const uint8_t *f,uint16_t i,uint16_t end){
+    uint8_t t=f[i];
+    uint16_t p=(uint16_t)(i+1u);
+    if(t=='/'||t=='@') p+=7u;
+    else if(t!='!'&&t!='=') return false;
+    if(end<p+19u || f[p+4]!='.' || f[p+14]!='.') return false;
+    const uint8_t *q=f+p;                     /* DDMM.hhN T DDDMM.hhE C */
+    char *o=str;
+    for(uint8_t k=0;k<18u;k++){
+        if(k==8u) continue;                   /* symbol table: next row */
+        if(k==2u||k==9u||k==12u) *o++=' ';
+        *o++=safe(q[k]);
+    }
+    tiny(Y_INFO,o);
+    o=str;
+    if(p>i+1u){ for(uint16_t k=(uint16_t)(i+1u);k<p;k++) *o++=safe(f[k]); *o++=' '; }
+    *o++=safe(q[8]); *o++=safe(q[18]); *o++=' ';
+    textRow(str,f,textRow(o,f,(uint16_t)(p+19u),end,Y_INFO+ROW_STEP),end,Y_INFO+2u*ROW_STEP);
+    return true;
+}
+
+/* ---- display ---- */
+static void draw(void){
+    const app_api_t *A=g.A;
+    /* The UI texts live in the assets: one read per frame into this word-aligned
+     * stack block, so each text costs a 2-byte sp-relative add instead of a
+     * literal and its pool word (gen_assets.py keeps every offset aligned). */
+    char s[UI_SIZE] __attribute__((aligned(4)));
+    char *o;
+    A->asset_read(0,s,UI_SIZE);
+    A->display_clear();
+    A->status_clear();
+    A->print_inverse(s+T_TITLE,2,0,true,true,(uint8_t)(2u+T_TITLE_CHARS*4u));
+    A->draw_battery();
+
+    if(!g.flen)                          /* no frame yet: a capsule, as APRS TX's TRANSMIT */
+        A->print_inverse(s+T_WAIT,WAIT_CAPS_X,0,true,true,(uint8_t)(WAIT_CAPS_X+T_WAIT_CHARS*4u));
+    else {
+        const uint8_t *f=g.frm;
+        uint16_t end=(uint16_t)(g.flen-2u);    /* the FCS is not shown */
+
+        o=putCall(str,f+7); *o++=' '; *o++='#'; o=puti(o,g.seq); *o='\0';
+        A->print_normal(str,0,0,0);          /* source */
+
+        /* ">DEST,DIGI*,..." while it fits one tiny row, then the rest of the
+         * address field is skipped up to its end bit */
+        o=str; *o++='>'; o=putCall(o,f);
+        uint16_t e=13;                         /* SSID byte of the current address */
+        while(!(f[e]&1u) && e+7u<end){
+            e+=7;
+            if(o<=str+20){ *o++=','; o=putCall(o,f+e-6); if(f[e]&0x80u) *o++='*'; }
+        }
+        tiny(Y_PATH,o);
+
+        /* info field (after control and PID): Mic-E and uncompressed positions
+         * decoded, anything else as text on 3 rows of 32 characters */
+        uint16_t i=(uint16_t)(e+3u);
+        if(end>=i+9u && micType(f[i])) drawMicE(f,i,end,s);
+        else if(!drawPos(f,i,end))
+            for(uint8_t row=0;row<3u;row++) i=textRow(str,f,i,end,(uint8_t)(Y_INFO+row*ROW_STEP));
+    }
+
+    /* dotted separator above the frequency: y = 30, bit 6 of line 3 (the big
+     * digits start at y = 33) */
+    for(uint8_t x=0;x<128u;x+=2u) A->fb[3][x]|=0x40u;
+    drawFreq(g.vfoFreq);
+
+    /* bottom line: "ok 12  -89dBm  sl 5/12/7": frames, RSSI of the last one,
+     * frames per slicer (<= 31 characters) */
+    o=put(str,s+T_OK); o=puti(o,g.nOk); *o++=' '; *o++=' ';
+    o=puti(o,g.rssi); o=put(o,s+T_DBM);
+    for(uint8_t k=0;k<NSL;k++){ if(k) *o++='/'; o=puti(o,g.good[k]); }
+    tiny(49,o);
+}
+
+/* ---- input ---- */
+static void handleKeys(void){
+    const app_api_t *A=g.A;
+    uint8_t key=A->get_key();
+    if(key==APP_KEY_INVALID||key==g.prevKey){ g.prevKey=key; return; }
+    g.prevKey=key;
+    g.redraw=1;
+    if(key==APP_KEY_EXIT) g.running=false;
+    else if(key==APP_KEY_MENU){
+        g.flen=0; g.nOk=0; g.seq=0; g.rssi=0;
+        for(uint8_t k=0;k<NSL;k++) g.good[k]=0;
+    }
+}
+
+/* ---- keys and screen, between frames ---- */
+static void house(void){
+    const app_api_t *A=g.A;
+    handleKeys();
+    if(!g.running) return;
+    A->backlight_on();         /* keep the screen lit while listening */
+    uint32_t t=A->ticks_ms();
+    if(t-g.tDraw>=REFRESH_MS) g.redraw=1;
+    if(!g.redraw) return;
+    g.redraw=0;
+    g.tDraw=t;
+    adcRestore();                /* the battery is on ADC channel 8 */
+    A->battery_sample();
+    adcSelPA4();
+    draw();
+    A->blit_status();
+    A->blit_full();
+}
+
+/* ---- the receiver: PA4 at 9.6 kHz, continuously, until EXIT ---- */
+static void listen(void){
+    const app_api_t *A=g.A;
+    dem_t d;
+    sl_t sl[NSL];
+    memset(&d,0,sizeof d);
+    memset(sl,0,sizeof sl);
+    A->asset_read(COS1200,d.cm,COS1200_LEN);
+    A->asset_read(COS2200,d.cs,COS2200_LEN);
+    d.dc=(int32_t)BIAS_CODE<<4;
+    d.pm=d.ps=64;
+    sl[0].wa=2; sl[0].wb=3;      /* favours space */
+    sl[1].wa=1; sl[1].wb=1;
+    sl[2].wa=3; sl[2].wb=2;      /* favours mark  */
+    for(uint8_t k=0;k<NSL;k++) sl[k].crc=0xFFFFu;
+
+    adcSelPA4();
+    clkStart();
+    uint32_t next=CYC_PER_SAMPLE;
+    uint16_t cnt=0;
+    uint8_t busyFor=0;
+    g.redraw=1;
+    while(g.running){
+        while((int32_t)(clkCyc()-next)<0){}
+        next+=CYC_PER_SAMPLE;
+        int32_t a,b;
+        front(&d,adcRead(),&a,&b);
+        bool bz=false;
+        for(uint8_t k=0;k<NSL;k++){
+            if(slice(&sl[k],a,b)) accept(&sl[k],k);
+            bz|=busy(&sl[k]);
+        }
+        if(++cnt<HOUSE_EVERY) continue;
+        cnt=0;
+        if(bz && ++busyFor<BUSY_MAX) continue;
+        busyFor=0;
+        house();
+        next=clkCyc()+CYC_PER_SAMPLE;   /* skip the samples the slot took */
+    }
+    adcRestore();
+}
+
+__attribute__((section(".text.entry"),used))
+void app_main(const app_api_t *api){
+    uint8_t frm[FRAME_MAX];      /* on the stack: the 4 KiB overlay also holds .bss */
+    g.A=api;
+    g.frm=frm;
+    g.prevKey=APP_KEY_INVALID;   /* the rest of g starts at 0 (overlay zeroed by the loader) */
+
+    g.savedSqr3=ADC_SQR3; g.savedSmpr3=ADC_SMPR3; g.savedModer=GPIOA_MODER; g.savedDac=DAC_CR;
+    g.savedRcc=RCC_APBENR1; g.savedDhr=DAC_DHR12R1;
+    biasOn();
+    api->backlight_on();
+    g.vfoFreq=api->rx_freq();
+    api->audio_path(true);
+    api->set_af(APP_AF_FM);
+    api->delay_ms(50);
+
+    g.running=true;
+    listen();
+
+    biasOff();
+    api->set_af(APP_AF_MUTE);
+    api->audio_path(false);
+}
diff --git a/App/apps/aprsrx/build.sh b/App/apps/aprsrx/build.sh
new file mode 100755
index 00000000..9cbb3b30
--- /dev/null
+++ b/App/apps/aprsrx/build.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# Build one overlay-app blob (.app). Invoked by ../../../compile-app.sh inside
+# the uvk1-uvk5v3 Docker image, run from this app's directory. Everything is
+# derived from the directory name; only APP_NAME - the human label baked into
+# the 64-byte blob header - is per-app. The .app file is named after it (spaces
+# stripped), so "Broadcast FM" -> BroadcastFM.app.
+set -euo pipefail
+
+APP="$(basename "$PWD")"            # breakout, foxhunt, beacon, fm, ...
+APP_NAME="APRS RX"                  # <-- the only per-app line
+APP_VER="0.5"
+APP_API_MIN=2
+APP_VMA=${APP_VMA:-0x20000280}      # pinned overlay VMA (Core/py32f071xb.ld)
+OUT="${APP_NAME// /}"               # blob basename ("Broadcast FM" -> BroadcastFM)
+
+CC=/opt/toolchain/bin/arm-none-eabi-gcc
+OBJCOPY=/opt/toolchain/bin/arm-none-eabi-objcopy
+command -v arm-none-eabi-gcc >/dev/null 2>&1 && { CC=arm-none-eabi-gcc; OBJCOPY=arm-none-eabi-objcopy; }
+
+CFLAGS="-mcpu=cortex-m0plus -mthumb -Os -fno-jump-tables -std=gnu11 -ffreestanding -fno-builtin -fno-common \
+  -fomit-frame-pointer -ffunction-sections -fdata-sections -Wall -Wextra"
+LDFLAGS="-nostdlib -nostartfiles -T app.ld -Wl,--defsym,APP_VMA=${APP_VMA} \
+  -Wl,--gc-sections -Wl,-Map=${APP}.map -Wl,--build-id=none -Wl,--no-warn-rwx-segments"
+
+rm -f ./*.app ./*.elf ./*.bin        # drop stale artifacts so discovery is unambiguous
+
+step() { printf '\r  🔨 %-13s [%d/4] %-8s' "$APP_NAME" "$1" "$2"; }
+trap 'printf "\r  ❌ %-13s build failed            \n" "$APP_NAME"' ERR
+
+step 1 assets  ; APP_VER="$APP_VER" python3 ./gen_assets.py "${APP}_assets.bin" "${APP}_assets.h"
+step 2 compile ; "$CC" $CFLAGS $LDFLAGS "${APP}_app.c" -lgcc -o "${APP}.elf"
+step 3 objcopy ; "$OBJCOPY" -O binary "${APP}.elf" "${APP}.bin"
+step 4 pack    ; python3 ../pack_app.py "${APP}.bin" "${OUT}.app" \
+                   --name "$APP_NAME" --ver "$APP_VER" --api-min "$APP_API_MIN" --vma "${APP_VMA}" \
+                   --shortcut none --assets "${APP}_assets.bin" >/dev/null
+trap - ERR
+
+BYTES=$(wc -c < "${APP}.bin")
+if [ "$BYTES" -gt 4096 ]; then
+  printf '\r  🚨 %-13s OVERFLOWS 4 KiB (%d B)     \n' "$APP_NAME" "$BYTES"; exit 1
+fi
+printf '\r  ✅ %-13s %4d B  (%d%% of 4 KiB)  ->  %s.app   \n' \
+       "$APP_NAME" "$BYTES" "$(( BYTES * 100 / 4096 ))" "$OUT"
diff --git a/App/apps/aprsrx/gen_assets.py b/App/apps/aprsrx/gen_assets.py
new file mode 100755
index 00000000..89d6ffa1
--- /dev/null
+++ b/App/apps/aprsrx/gen_assets.py
@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+# APRS RX read-only assets: the screen texts and the correlator tables.
+#
+# The UI texts come first, each padded to a multiple of 4 bytes: draw() reads
+# them in one asset_read into a word-aligned stack block, so every text costs a
+# 2-byte sp-relative add instead of a literal-pool load and a pool word.
+# The Mic-E message names are a fixed-stride table read straight into the row.
+# The tables are 127 * cos(2 pi f n / 9600): one period of 1200 Hz (8 samples)
+# and of 2200 Hz (48 samples = 11 cycles). The sine is the same table read 3/4
+# of a period ahead (+6 and +12), as in test/model_rx.py.
+#
+#   ./gen_assets.py aprsrx_assets.bin aprsrx_assets.h
+import math, os, sys
+sys.dont_write_bytecode = True
+HERE = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.join(HERE, ".."))
+from app_assets import Assets
+
+FS = 9600
+TITLE = "APRS RX"                           # the version is in the .app header
+WAIT_CAPS = "WAIT"                          # status-bar capsule until a frame
+
+UI = [
+    ("T_TITLE",  TITLE),
+    ("T_WAIT",   WAIT_CAPS),
+    ("T_DBM",    "dBm  sl "),
+    ("T_OK",     "ok "),
+    ("T_KMH",    "km/h "),
+    ("T_CUSTOM", "Custom-"),
+]
+
+# Mic-E message types, indexed by the destination's message bits A B C
+MIC_MSG = ["Emergency", "Priority", "Special", "Committed",
+           "Returning", "In Service", "En Route", "Off Duty"]
+
+def cos_table(f):
+    per = FS // math.gcd(FS, f)
+    return [int(round(127 * math.cos(2 * math.pi * f * n / FS))) for n in range(per)]
+
+a = Assets("APRSRX")
+ui_size = 0
+for name, s in UI:
+    pad = -(len(s) + 1) % 4                 # keep every offset word-aligned
+    a.text(name, s + "\0" * pad)
+    ui_size += len(s) + 1 + pad
+a.const("UI_SIZE", ui_size)                 # the UI block read by draw()
+a.const("T_TITLE_CHARS", len(TITLE))
+a.const("T_WAIT_CHARS", len(WAIT_CAPS))
+a.table("T_MSG", MIC_MSG)                    # Mic-E standard messages
+a.i8("COS1200", cos_table(1200))            # 8 entries
+a.i8("COS2200", cos_table(2200))            # 48 entries
+a.main()
diff --git a/App/apps/aprsrx/test/ax25.py b/App/apps/aprsrx/test/ax25.py
new file mode 100644
index 00000000..4d075f1f
--- /dev/null
+++ b/App/apps/aprsrx/test/ax25.py
@@ -0,0 +1,107 @@
+#!/usr/bin/env python3
+"""AX.25 UI frames for APRS, and their Bell 202 bit stream.
+
+build(src, dst, path, info) -> frame bytes (addresses + 0x03 0xF0 + info + FCS)
+hdlc_bits(frame)            -> bits on the air before NRZI: flags, the frame
+                               LSB first with bit stuffing, flags
+decode(frame)               -> "SRC>DST,PATH:info" (None if the FCS is wrong)
+
+  ax25.py [--call F4HWN]   prints the test frames and their length
+"""
+import argparse
+
+TXDELAY_FLAGS = 40      # ~267 ms of 0x7E before the frame (1 flag = 6.67 ms)
+TAIL_FLAGS = 3
+
+
+def crc16(data):
+    """CRC-16/X.25 (the AX.25 FCS): reflected 0x1021, init/xorout 0xFFFF."""
+    crc = 0xFFFF
+    for b in data:
+        crc ^= b
+        for _ in range(8):
+            crc = (crc >> 1) ^ 0x8408 if crc & 1 else crc >> 1
+    return crc ^ 0xFFFF
+
+
+def addr(call, last=False, repeated=False):
+    """One 7-byte address field: 6 chars shifted left, then the SSID byte."""
+    call, _, ssid = call.upper().rstrip("*").partition("-")
+    out = bytes((ord(c) << 1) for c in call.ljust(6)[:6])
+    sb = 0x60 | ((int(ssid) if ssid else 0) << 1)
+    if repeated:
+        sb |= 0x80                          # H bit: this digipeater has relayed it
+    if last:
+        sb |= 0x01                          # end of the address field
+    return out + bytes([sb])
+
+
+def build(src, dst="APZK5", path=(), info=""):
+    hops = list(path)
+    f = addr(dst) + addr(src, last=not hops)
+    for i, h in enumerate(hops):
+        f += addr(h, last=i == len(hops) - 1, repeated=h.endswith("*"))
+    f += b"\x03\xF0" + info.encode("latin-1")
+    fcs = crc16(f)
+    return f + bytes([fcs & 0xFF, fcs >> 8])
+
+
+def hdlc_bits(frame, lead=TXDELAY_FLAGS, tail=TAIL_FLAGS):
+    flag = [(0x7E >> i) & 1 for i in range(8)]
+    bits = flag * lead
+    ones = 0
+    for b in frame:
+        for i in range(8):
+            bit = (b >> i) & 1
+            bits.append(bit)
+            ones = ones + 1 if bit else 0
+            if ones == 5:
+                bits.append(0)              # stuffed zero
+                ones = 0
+    return bits + flag * tail
+
+
+def decode(frame):
+    """Readable form of a received frame, or None if too short / bad FCS."""
+    if len(frame) < 18 or crc16(frame[:-2]) != frame[-2] | (frame[-1] << 8):
+        return None
+    calls, i = [], 0
+    while i + 7 <= len(frame) - 2:
+        c = "".join(chr(x >> 1) for x in frame[i:i + 6]).rstrip()
+        ssid = (frame[i + 6] >> 1) & 15
+        if ssid:
+            c += "-%d" % ssid
+        if len(calls) >= 2 and frame[i + 6] & 0x80:
+            c += "*"
+        calls.append(c)
+        i += 7
+        if frame[i - 1] & 1:
+            break
+    info = frame[i + 2:-2].decode("latin-1")
+    return "%s>%s%s:%s" % (calls[1], calls[0],
+                           "".join("," + c for c in calls[2:]), info)
+
+
+def test_frames(call="F4HWN"):
+    """name -> frame bytes. 'badfcs' has one flipped info bit: must be rejected."""
+    pos = "!4850.90N/00216.25E-UV-K5 APRS RX test"
+    fr = {
+        "pos":    build(call, path=["WIDE1-1"], info=pos),
+        "digi":   build(call, path=["F1ZZZ-10*", "WIDE2-1"], info=pos),
+        "msg":    build(call, path=["WIDE1-1"], info=":%-9s:Hello from the Flipper{01" % call),
+        "status": build(call, info=">Flipper Zero AFSK square-wave test"),
+        "long":   build(call, path=["WIDE1-1", "WIDE2-2"],
+                        info=">" + "".join(chr(0x41 + i % 26) for i in range(200))),
+    }
+    bad = bytearray(fr["pos"])
+    bad[20] ^= 0x04
+    fr["badfcs"] = bytes(bad)
+    return fr
+
+
+if __name__ == "__main__":
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--call", default="F4HWN")
+    a = ap.parse_args()
+    for name, f in test_frames(a.call).items():
+        print("%-7s %3d bytes  %s" % (name, len(f), decode(f)))
diff --git a/App/apps/aprsrx/test/flipper/aprs_badfcs.sub b/App/apps/aprsrx/test/flipper/aprs_badfcs.sub
new file mode 100644
index 00000000..ccdd7749
--- /dev/null
+++ b/App/apps/aprsrx/test/flipper/aprs_badfcs.sub
@@ -0,0 +1,11 @@
+Filetype: Flipper SubGhz RAW File
+Version: 1
+Frequency: 433650000
+Preset: FuriHalSubGhzPreset2FSKDev238Async
+Protocol: RAW
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diff --git a/App/apps/aprsrx/test/flipper/aprs_digi.sub b/App/apps/aprsrx/test/flipper/aprs_digi.sub
new file mode 100644
index 00000000..5369a7ea
--- /dev/null
+++ b/App/apps/aprsrx/test/flipper/aprs_digi.sub
@@ -0,0 +1,11 @@
+Filetype: Flipper SubGhz RAW File
+Version: 1
+Frequency: 433650000
+Preset: FuriHalSubGhzPreset2FSKDev238Async
+Protocol: RAW
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diff --git a/App/apps/aprsrx/test/flipper/aprs_long.sub b/App/apps/aprsrx/test/flipper/aprs_long.sub
new file mode 100644
index 00000000..54350670
--- /dev/null
+++ b/App/apps/aprsrx/test/flipper/aprs_long.sub
@@ -0,0 +1,18 @@
+Filetype: Flipper SubGhz RAW File
+Version: 1
+Frequency: 433650000
+Preset: FuriHalSubGhzPreset2FSKDev238Async
+Protocol: RAW
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diff --git a/App/apps/aprsrx/test/flipper/aprs_msg.sub b/App/apps/aprsrx/test/flipper/aprs_msg.sub
new file mode 100644
index 00000000..f64c5984
--- /dev/null
+++ b/App/apps/aprsrx/test/flipper/aprs_msg.sub
@@ -0,0 +1,10 @@
+Filetype: Flipper SubGhz RAW File
+Version: 1
+Frequency: 433650000
+Preset: FuriHalSubGhzPreset2FSKDev238Async
+Protocol: RAW
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diff --git a/App/apps/aprsrx/test/flipper/aprs_pos.sub b/App/apps/aprsrx/test/flipper/aprs_pos.sub
new file mode 100644
index 00000000..9295714d
--- /dev/null
+++ b/App/apps/aprsrx/test/flipper/aprs_pos.sub
@@ -0,0 +1,11 @@
+Filetype: Flipper SubGhz RAW File
+Version: 1
+Frequency: 433650000
+Preset: FuriHalSubGhzPreset2FSKDev238Async
+Protocol: RAW
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+RAW_Data: 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 417 -417 227 -227 227 -291 417 -353 227 -228 227 -353 417 -417 416 -291 227 -227 228 -416 417 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 417 -417 416 -417 227 -228 227 -290 417 -417 416 -354 227 -227 228 -227 227 -227 228 -227 227 -227 291 -417 416 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -291 416 -417 417 -353 227 -228 227 -353 417 -417 416 -291 227 -227 228 -227 227 -227 291 -417 416 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -291 416 -354 227 -227 228 -353 417 -290 227 -228 227 -417 416 -228 227 -227 291 -416 417 -417 353 -227 228 -227 353 -417 291 -227 227 -227 417 -417 227 -227 227 -291 417 -416 417 -417 416 -354 227 -227 228 -353 417 -290 227 -228 227 -227 228 -227 227 -227 228 -227 353 -417 291 -227 227 -227 417 -417 416 -417 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -417 417 -416 417 -417 416 -228 227 -227 291 -416 354 -227 227 -228 353 -417 290 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -417 417 -416 417 -417 416 -417 417 -227 227 -227 228 -227 227 -228 353 -417 416 -417 291 -227 227 -227 417 -417 416 -417 417 -416 417 -417 227 -227 227 -291 417 -416 417 -353 228 -227 227 -354 416 -291 227 -227 228 -416 417 -227 228 -227 290 -417 417 -416 354 -227 227 -228 353 -417 290 -227 228 -227 417 -416 228 -227 227 -291 416 -417 417 -416 417 -353 228 -227 227 -354 416 -417 417 -416 417 -417 416 -291 227 -227 228 -227 227 -227 291 -417 416 -417 353 -228 227 -227 228 -227 227 -227 417 -417 227 -227 227 -228 227 -227 228 -353 417 -290 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 354 -416 417 -417 290 -227 228 -227 417 -416 228 -227 227 -227 228 -227 227 -354 416 -417 417 -290 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 354 -416 417 -417 290 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -354 416 -417 417 -416 417 -291 227 -227 227 -417 417 -227 227 -227 291 -417
+RAW_Data: 353 -227 228 -227 353 -417 291 -227 227 -227 228 -227 227 -291 416 -417 417 -416 417 -353 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 353 -417 416 -417 417 -416 291 -227 227 -228 416 -417 227 -228 227 -290 417 -353 228 -227 227 -354 416 -291 227 -227 228 -416 417 -227 228 -227 290 -417 417 -416 417 -417 416 -417 417 -416 417 -417 353 -227 228 -227 353 -417 291 -227 227 -227 417 -417 227 -227 227 -228 227 -227 228 -353 417 -290 227 -228 227 -417 416 -228 227 -227 227 -228 227 -227 354 -416 417 -417 416 -417 291 -227 227 -227 417 -417 227 -227 227 -291 417 -353 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 353 -417 291 -227 227 -227 228 -227 227 -291 416 -417 417 -353 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 354 -416 291 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -417 416 -228 227 -227 291 -416 417 -417 416 -417 417 -416 354 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -353 417 -291 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 417 -417 227 -227 227 -291 417 -353 227 -228 227 -353 417 -291 227 -227 227 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 416 -417 417 -416 417 -417 416 -417 227 -228 227 -290 417 -417 416 -354 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 417 -416 228 -227 227 -291 416 -354 227 -227 228 -353 417 -290 227 -228 227 -417 416 -417 417 -416 417 -227 228 -227 290 -417 353 -228 227 -227 354 -416 291 -227 227 -228 416 -417 417 -416 417 -417 227 -227 227 -291 417 -353 227 -228 227 -227 227 -228 227 -417 416 -228 227 -227 227 -228 227 -227 228 -227 227 -227 417 -417 227 -227 227 -228 227 -227 228 -353 417 -290 227 -228 227 -417 416 -417 417 -416 417 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -291 416 -417 417 -416 417 -353 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 417 -416 228 -227 227 -291 416 -354 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 417 -416 228 -227 227 -227 228 -227 227 -354 416 -417 417 -290 227 -228 227 -227 228 -227 227 -227 228 -227 353 -417 291 -227 227 -227 228 -227 227 -291 416 -417 417 -353 227 -228
+RAW_Data: 227 -353 417 -291 227 -227 227 -228 227 -227 291 -416 417 -417 353 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -417 416 -354 227 -227 228 -353 417 -416 417 -291 227 -227 227 -228 227 -227 291 -416 417 -417 353 -227 228 -227 227 -227 228 -227 417 -416 228 -227 227 -227 228 -227 227 -228 227 -227 227 -417 417 -416 417 -227 228 -227 227 -227 228 -227 353 -417 417 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -353 417 -416 417 -291 227 -227 227 -417 417 -416 417 -417 416 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 227 -227 227 -291 417 -416 417 -353 228 -227 227 -228 227 -227 227 -417 417 -416 417 -417 416 -228 227 -227 291 -416 354 -227 227 -228 353 -417 290 -227 228 -227 417 -416 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 291 -417 353 -227 228 -227 353 -417 291 -227 227 -227 417 -417 416 -417 227 -228 227 -290 417 -353 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 291 -417 416 -417 353 -228 227 -227 354 -416 417 -417 290 -227 228 -227 417 -416 417 -417 227 -227 227 -228 227 -227 228 -353 417 -416 417 -417 416 -291 227 -227 228 -416 417 -417 416 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 416 -417 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -417 417 -227 227 -227 291 -417 416 -417 353 -228 227 -227 354 -416 417 -417 290 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 353 -417 416 -417 291 -227 227 -227 417 -417 227 -227 227 -291 417 -353 227 -228 227 -353 417 -417 416 -291 227 -227 228 -416 417 -227 228 -227 290 -417 417 -416 354 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -353 417 -416 417 -291 227 -227 227 -228 227 -227 291 -416 354 -227 227 -228 227 -227 227 -228 227 -227 227 -291 417 -416 417 -417 416 -354 227 -227 228 -353 417 -416 417 -417 416 -417 417 -290 227 -228 227 -417 416 -228 227 -227 227 -228 227 -227 354 -416 417 -417 416 -417 417 -416 291 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -353 417 -417 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 353 -417 290 -227 228 -227 227 -228 227 -290 417 -417 416 -417 417 -416 417 -353 228 -227 227 -354 416 -417 417 -416 417 -417 416 -417 417 -416 417 -417 416 -291 227 -227 228 -416 417 -417 416 -417 417 -416 417 -417
+RAW_Data: 416 -417 417 -416 417 -227 228 -227 290 -417 417 -416 417 -417 416 -417 417 -416 417 -417 416 -417 353 -228 227 -227 10076
diff --git a/App/apps/aprsrx/test/flipper/aprs_status.sub b/App/apps/aprsrx/test/flipper/aprs_status.sub
new file mode 100644
index 00000000..a11936b7
--- /dev/null
+++ b/App/apps/aprsrx/test/flipper/aprs_status.sub
@@ -0,0 +1,10 @@
+Filetype: Flipper SubGhz RAW File
+Version: 1
+Frequency: 433650000
+Preset: FuriHalSubGhzPreset2FSKDev238Async
+Protocol: RAW
+RAW_Data: 100227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227
+RAW_Data: 227 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -353
+RAW_Data: 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 417 -417 227 -227 227 -291 417 -353 227 -228 227 -353 417 -417 416 -291 227 -227 228 -416 417 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 417 -417 416 -417 227 -228 227 -290 417 -417 416 -354 227 -227 228 -227 227 -227 228 -227 227 -227 291 -417 416 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -291 416 -417 417 -353 227 -228 227 -353 417 -417 416 -291 227 -227 228 -227 227 -227 291 -417 416 -417 353 -228 227 -227 228 -227 227 -227 228 -227 227 -291 416 -354 227 -227 228 -353 417 -290 227 -228 227 -417 416 -228 227 -227 291 -416 417 -417 353 -227 228 -227 353 -417 291 -227 227 -227 417 -417 227 -227 227 -291 417 -416 417 -417 416 -354 227 -227 228 -353 417 -290 227 -228 227 -227 228 -227 227 -227 228 -227 353 -417 291 -227 227 -227 417 -417 416 -417 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -417 417 -416 417 -417 416 -228 227 -227 291 -416 354 -227 227 -228 353 -417 290 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -417 417 -416 417 -417 416 -417 417 -227 227 -227 228 -227 227 -228 353 -417 416 -417 291 -227 227 -227 417 -417 416 -417 417 -416 417 -417 227 -227 227 -291 417 -416 417 -353 228 -227 227 -354 416 -291 227 -227 228 -416 417 -227 228 -227 290 -417 417 -416 354 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -228 227 -227 291 -416 417 -417 416 -417 353 -228 227 -227 354 -416 291 -227 227 -228 416 -417 227 -228 227 -290 417 -353 228 -227 227 -354 416 -291 227 -227 228 -416 417 -417 416 -417 417 -416 417 -417 416 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -417 417 -227 227 -227 291 -417 353 -227 228 -227 227 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -354 416 -417 417 -290 227 -228 227 -417 416 -228 227 -227 227 -228 227 -227 228 -227 227 -227 417 -417 416 -417 417 -416 228 -227
+RAW_Data: 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 291 -417 416 -417 417 -416 354 -227 227 -228 353 -417 290 -227 228 -227 417 -416 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 227 -227 291 -416 354 -227 227 -228 353 -417 290 -227 228 -227 417 -416 417 -417 416 -417 417 -416 228 -227 227 -227 228 -227 227 -354 416 -417 417 -290 227 -228 227 -417 416 -417 417 -416 417 -227 228 -227 290 -417 417 -416 354 -227 227 -228 353 -417 416 -417 417 -416 417 -417 290 -227 228 -227 417 -416 228 -227 227 -291 416 -354 227 -227 228 -353 417 -416 417 -291 227 -227 227 -417 417 -227 227 -227 228 -227 227 -228 353 -417 416 -417 417 -416 291 -227 227 -228 227 -227 227 -291 417 -416 417 -353 228 -227 227 -228 227 -227 227 -417 417 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -353 417 -291 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 417 -417 416 -417 417 -416 417 -417 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -417 416 -228 227 -227 291 -416 354 -227 227 -228 353 -417 290 -227 228 -227 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -417 417 -227 227 -227 291 -417 353 -227 228 -227 353 -417 417 -416 291 -227 227 -228 416 -417 417 -416 417 -417 227 -227 227 -291 417 -353 227 -228 227 -227 227 -228 227 -417 416 -417 417 -416 417 -227 228 -227 290 -417 417 -416 354 -227 227 -228 227 -227 227 -228 416 -417 417 -416 417 -417 227 -227 227 -228 227 -227 228 -353 417 -290 227 -228 227 -227 228 -227 290 -417 353 -228 227 -227 354 -416 291 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -353 417 -291 227 -227 227 -228 227 -227 227 -228 227 -227 354 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -417 416 -228 227 -227 291 -416 354 -227 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -353 417 -416 417 -291 227 -227 227 -228 227 -227 291 -416 417 -417 416 -417 417 -416 354 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -290 417 -353 228 -227 227 -228 227 -227 227 -228 227 -227 291 -416 354 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -227 228 -227 290 -417 417 -416 354 -227 227 -228 227 -227 227 -228 416 -417 227 -228 227 -227 227 -228 227 -227 227 -228 227 -417 416 -417 417 -227 227 -227
+RAW_Data: 228 -227 227 -228 227 -227 227 -228 416 -417 417 -416 228 -227 227 -291 416 -417 417 -416 417 -417 416 -354 227 -227 228 -227 227 -227 228 -227 227 -227 228 -227 227 -228 353 -417 416 -417 291 -227 227 -227 417 -417 227 -227 227 -291 417 -416 417 -417 416 -354 227 -227 228 -353 417 -416 417 -417 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 227 -227 227 -228 416 -417 417 -416 228 -227 227 -227 228 -227 227 -354 416 -291 227 -227 228 -227 227 -227 228 -227 227 -228 353 -417 290 -227 228 -227 417 -416 228 -227 227 -291 416 -354 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 290 -417 353 -228 227 -227 228 -227 227 -227 417 -417 416 -417 417 -416 417 -417 227 -227 227 -228 227 -227 228 -353 417 -416 417 -291 227 -227 227 -417 417 -416 417 -417 416 -228 227 -227 227 -228 227 -227 228 -227 227 -227 417 -417 227 -227 227 -228 227 -227 228 -227 227 -227 228 -227 227 -227 291 -417 353 -227 228 -227 353 -417 417 -416 291 -227 227 -228 227 -227 227 -228 227 -227 228 -227 227 -227 228 -416 417 -227 228 -227 290 -417 417 -416 417 -417 353 -227 228 -227 353 -417 417 -416 417 -417 290 -227 228 -227 417 -416 417 -417 227 -227 227 -291 417 -416 417 -353 228 -227 227 -228 227 -227 227 -417 417 -416 417 -417 416 -417 417 -416 417 -417 416 -417 417 -227 227 -227 291 -417 416 -417 417 -416 417 -417 416 -417 417 -416 417 -417 353 -227 228 -227 353 -417 417 -416 417 -417 416 -417 417 -416 417 -417 416 -417 291 -227 227 -227 10000
diff --git a/App/apps/aprsrx/test/flipper_aprs.py b/App/apps/aprsrx/test/flipper_aprs.py
new file mode 100644
index 00000000..3fd12666
--- /dev/null
+++ b/App/apps/aprsrx/test/flipper_aprs.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+"""Flipper Zero test transmitter for the APRS RX app: write Sub-GHz RAW files
+(.sub) that play an APRS frame (AX.25, Bell 202 AFSK 1200 bauds) on 433.650 MHz
+(433 MHz SRD band, the same bench channel as EPIRB 406).
+
+The Flipper's CC1101 cannot frequency-modulate with an audio tone, only switch
+between two frequencies (preset 2FSKDev238Async, +/-2.38 kHz). So each AFSK
+tone is sent as a square wave: the carrier toggles at twice the tone frequency
+(1200 Hz mark, 2200 Hz space), phase-continuous across bit boundaries, and the
+receiver's discriminator outputs that square wave; its audio low-pass leaves
+mostly the fundamental. The RAW durations are the square wave's half-periods,
+rounded from exact edge times so the timing error never accumulates.
+
+  flipper_aprs.py <out_dir> [--call F4HWN] [--freq 433650000]
+    -> aprs_pos.sub, _digi, _msg, _status, _long, _badfcs (see ax25.test_frames)
+One frame per file: press Send once, wait ~1 s before the next one.
+"""
+import argparse, os, sys
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from ax25 import test_frames, hdlc_bits, decode
+
+PRESET = "FuriHalSubGhzPreset2FSKDev238Async"
+BAUD = 1200
+MARK, SPACE = 1200.0, 2200.0
+LEAD_US = 100000        # unmodulated carrier before the flags (squelch / RSSI trigger)
+TAIL_US = 10000         # carrier kept after the last flag
+PER_LINE = 512          # values per RAW_Data line, as the Flipper writes them
+
+
+def nrzi_tones(bits):
+    """Bell 202 NRZI: a 0 changes the tone, a 1 keeps it. Starts on mark."""
+    f, out = MARK, []
+    for b in bits:
+        if not b:
+            f = SPACE if f == MARK else MARK
+        out.append(f)
+    return out
+
+
+def edges(tones, lead_us=LEAD_US, tail_us=TAIL_US):
+    """Exact edge times (us) of the square wave; level is high at t=0.
+    Returns (edge_times, end_time)."""
+    t0 = float(lead_us)                  # lead carrier holds the high level
+    ph = 0.0                             # tone phase in cycles (high while frac < 0.5)
+    tb = 1e6 / BAUD
+    ed = []
+    for i, f in enumerate(tones):
+        start, end = t0 + i * tb, t0 + (i + 1) * tb
+        t = start
+        while True:
+            nxt = (int(ph * 2) + 1) / 2.0             # next half-cycle boundary
+            dt = (nxt - ph) / f * 1e6
+            if t + dt > end:
+                ph += (end - t) * f / 1e6
+                break
+            t += dt
+            ph = nxt
+            ed.append(t)
+    return ed, t0 + len(tones) * tb + tail_us
+
+
+def raw_durations(ed, end):
+    """Signed RAW durations: positive = high tone, negative = low tone."""
+    pts = [0] + [round(t) for t in ed] + [round(end)]
+    out, lv = [], 1
+    for a, b in zip(pts, pts[1:]):
+        out.append((b - a) if lv else -(b - a))
+        lv ^= 1
+    return out
+
+
+def sub_durations(frame):
+    ed, end = edges(nrzi_tones(hdlc_bits(frame)))
+    return raw_durations(ed, end)
+
+
+def write_sub(path, frame, freq):
+    d = sub_durations(frame)
+    lines = ["Filetype: Flipper SubGhz RAW File", "Version: 1",
+             "Frequency: %d" % freq, "Preset: %s" % PRESET, "Protocol: RAW"]
+    for i in range(0, len(d), PER_LINE):
+        lines.append("RAW_Data: " + " ".join(str(x) for x in d[i:i + PER_LINE]))
+    with open(path, "w") as f:
+        f.write("\n".join(lines) + "\n")
+    return d
+
+
+if __name__ == "__main__":
+    ap = argparse.ArgumentParser()
+    ap.add_argument("out", nargs="?", default=".")
+    ap.add_argument("--call", default="F4HWN")
+    ap.add_argument("--freq", type=int, default=433650000)
+    a = ap.parse_args()
+    if 144000000 <= a.freq <= 146000000:
+        sys.exit("refusing 2 m: the Flipper cannot reach it anyway, and 144.800 is live APRS")
+    os.makedirs(a.out, exist_ok=True)
+    for name, fr in test_frames(a.call).items():
+        p = os.path.join(a.out, "aprs_%s.sub" % name)
+        d = write_sub(p, fr, a.freq)
+        print("%-28s %5.0f ms %5d edges  %s" % (p, sum(abs(x) for x in d) / 1000,
+                                               len(d), decode(fr) or "(bad FCS)"))
diff --git a/App/apps/aprsrx/test/mice.py b/App/apps/aprsrx/test/mice.py
new file mode 100644
index 00000000..43bdb36e
--- /dev/null
+++ b/App/apps/aprsrx/test/mice.py
@@ -0,0 +1,250 @@
+#!/usr/bin/env python3
+"""Mic-E: an encoder written from the APRS 1.0.1 spec (chapter 10), and the
+display decoder of aprsrx_app.c transliterated byte for byte (uint8 wrap, no
+division), checked against each other and against a real FT3D frame.
+Also the standard (uncompressed) position display, against real frames.
+
+  mice.py        runs the tests and prints the screen rows
+"""
+import os, sys
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+MSG = ["Emergency", "Priority", "Special", "Committed",
+       "Returning", "In Service", "En Route", "Off Duty"]   # index = bits A B C
+
+
+# ------------------------------------------------------------ encoder (spec) --
+
+def encode(call, lat, lon, speed_kn=0, course=0, sym="[/", msg=7, custom=False,
+           comment="", path=(), marker="`", suffix="_0", alt_m=None):
+    """lat/lon in signed decimal degrees -> AX.25 frame bytes."""
+    north, east = lat >= 0, lon >= 0
+    lat, lon = abs(lat), abs(lon)
+    ld = int(lat); lm = (lat - ld) * 60
+    lmi = int(lm); lh = int(round((lm - lmi) * 100))
+    if lh == 100: lmi, lh = lmi + 1, 0
+    digits = "%02d%02d%02d" % (ld, lmi, lh)
+    od = int(lon); om = (lon - od) * 60
+    omi = int(om); oh = int(round((om - omi) * 100))
+    if oh == 100: omi, oh = omi + 1, 0
+    offset = od < 10 or od >= 100
+    bits = [(msg >> 2) & 1, (msg >> 1) & 1, msg & 1]
+    dest = ""
+    for k, ch in enumerate(digits):
+        d = int(ch)
+        if k < 3:
+            one = bits[k]
+            dest += chr((ord("A") if custom else ord("P")) + d) if one else chr(ord("0") + d)
+        elif k == 3:
+            dest += chr(ord("P") + d) if north else chr(ord("0") + d)
+        elif k == 4:
+            dest += chr(ord("P") + d) if offset else chr(ord("0") + d)
+        else:
+            dest += chr(ord("P") + d) if not east else chr(ord("0") + d)
+    if od <= 9:      b1 = od + 118
+    elif od <= 99:   b1 = od + 28
+    elif od <= 109:  b1 = od + 8
+    else:            b1 = od - 72
+    b2 = omi + 88 if omi <= 9 else omi + 28
+    b3 = oh + 28
+    b4 = speed_kn // 10 + 28
+    b5 = (speed_kn % 10) * 10 + course // 100 + 28
+    b6 = course % 100 + 28
+    info = bytes([0x60, b1, b2, b3, b4, b5, b6]) + sym.encode()
+    body = comment
+    if alt_m is not None:
+        v = alt_m + 10000
+        body = chr(v // 8281 + 33) + chr(v // 91 % 91 + 33) + chr(v % 91 + 33) + "}" + body
+    if marker:
+        body = marker + body + suffix
+    return _frame(call, dest, path, info + body.encode("latin-1"))
+
+
+def _frame(call, dest, path, info):
+    from ax25 import addr, crc16
+    hops = list(path)
+    f = addr(dest) + addr(call, last=not hops)
+    for i, h in enumerate(hops):
+        f += addr(h, last=i == len(hops) - 1)
+    f += b"\x03\xF0" + info
+    c = crc16(f)
+    return f + bytes([c & 0xFF, c >> 8])
+
+
+# ------------------------------------------- decoder (mirror of aprsrx_app.c) --
+
+def sub(v, d):
+    q = 0
+    while v >= d:
+        v -= d; q += 1
+    return q, v
+
+def put2(v):
+    q, v = sub(v, 10)
+    return chr(48 + q) + chr(48 + v)
+
+def put3(v):
+    q, v = sub(v, 100)
+    return chr(48 + q) + put2(v)
+
+def mic_digit(c):
+    if 0x30 <= c <= 0x39: return c - 0x30
+    if 0x41 <= c <= 0x4A: return c - 0x41
+    if 0x50 <= c <= 0x59: return c - 0x50
+    return 0                                   # K, L, Z: position ambiguity
+
+def mic_bit(c):
+    return c >= 0x50 or (0x41 <= c <= 0x4B)
+
+def text_row(o, f, i, end):
+    while len(o) < 32 and i < end:
+        ch = f[i]
+        o += "." if ch < 0x20 or ch > 0x7E else chr(ch)
+        i += 1
+    return o, i
+
+def is_mice(f, i, end):
+    return end - i >= 9 and f[i] in (0x60, 0x27, 0x1C, 0x1D)
+
+def draw_mice(f, i, end):
+    c = [f[k] >> 1 for k in range(6)]
+    # row 1: position
+    o = ""
+    for k in range(6):
+        o += chr(48 + mic_digit(c[k]))
+        if k == 1: o += " "
+        if k == 3: o += "."
+    o += "N" if mic_bit(c[3]) else "S"
+    deg = (f[i + 1] - 28) & 0xFF
+    if mic_bit(c[4]): deg += 100
+    if 180 <= deg <= 189: deg -= 80
+    elif 190 <= deg <= 199: deg -= 190
+    mn = (f[i + 2] - 28) & 0xFF
+    if mn >= 60: mn -= 60
+    o += " " + put3(deg) + " " + put2(mn) + "." + put2((f[i + 3] - 28) & 0xFF)
+    o += "W" if mic_bit(c[5]) else "E"
+    r1 = o
+    # row 2: speed, course, symbol, message
+    dc = (f[i + 5] - 28) & 0xFF
+    q, dc = sub(dc, 10)
+    sp = ((f[i + 4] - 28) & 0xFF) * 10 + q
+    crs = dc * 100 + ((f[i + 6] - 28) & 0xFF)
+    if sp >= 800: sp -= 800
+    if crs >= 400: crs -= 400
+    kmh = (sp * 1897) >> 10
+    o = "%dkm/h %d " % (kmh, crs) + chr(f[i + 7]) + chr(f[i + 8]) + " "
+    idx = mic_bit(c[0]) * 4 + mic_bit(c[1]) * 2 + mic_bit(c[2])
+    custom = any(0x41 <= x <= 0x4B for x in c[:3])
+    o += ("Custom-" + chr(48 + 7 - idx)) if custom and idx else MSG[idx]
+    r2 = o
+    # row 3: comment without the device markers, altitude first
+    j = i + 9
+    while end > j and f[end - 1] in (0x0D, 0x0A): end -= 1
+    if j < end:
+        m = f[j]
+        if m in (0x60, 0x27):
+            j += 1
+            if end - j >= 2: end -= 2
+        elif m in (0x3E, 0x5D):
+            j += 1
+            if end > j and f[end - 1] in (0x3D, 0x5E): end -= 1
+    o = ""
+    if end - j >= 4 and f[j + 3] == 0x7D:
+        alt = (((f[j] - 33) * 91 + (f[j + 1] - 33)) * 91 + (f[j + 2] - 33)) - 10000
+        o = "%dm " % alt
+        j += 4
+    r3, _ = text_row(o, f, j, end)
+    return r1, r2, r3
+
+
+def safe(ch):
+    return "." if ch < 0x20 or ch > 0x7E else chr(ch)
+
+def draw_pos(f, i, end):
+    """Uncompressed position ('!' '=' or, after a 7-char timestamp, '/' '@'):
+    None when the info field is anything else (shown as raw text)."""
+    t = f[i]
+    p = i + 1
+    if t in (0x2F, 0x40): p += 7
+    elif t not in (0x21, 0x3D): return None
+    if end < p + 19 or f[p + 4] != 0x2E or f[p + 14] != 0x2E: return None
+    q = f[p:]
+    o = ""
+    for k in range(18):
+        if k == 8: continue
+        if k in (2, 9, 12): o += " "
+        o += safe(q[k])
+    r1 = o
+    o = ""
+    if p > i + 1:
+        o += "".join(safe(f[k]) for k in range(i + 1, p)) + " "
+    o += safe(q[8]) + safe(q[18]) + " "
+    r2, j = text_row(o, f, p + 19, end)
+    r3, _ = text_row("", f, j, end)
+    return r1, r2, r3
+
+
+def info_start(f):
+    end = len(f) - 2
+    e = 13
+    while not (f[e] & 1) and e + 7 < end:
+        e += 7
+    return e + 3, end
+
+
+# ------------------------------------------------------------------- tests --
+
+def main():
+    ok = True
+    # the FT3D frame received on 2026-09-30 (screen: >TXUPX9, `x,5l .[/`_0.)
+    ft3d = _frame("F4HWN", "TXUPX9", (), b"`x,5l \x1c[/`_0\r")
+    i, end = info_start(ft3d)
+    rows = draw_mice(ft3d, i, end)
+    print("FT3D  ", rows)
+    ok &= rows == ("48 50.89N 002 16.25E", "0km/h 0 [/ Off Duty", "")
+
+    cases = [
+        # lat, lon, speed kn, course, msg, custom, alt, comment -> expected rows
+        (48.848306, 2.270844, 0, 0, 7, False, None, "", "48 50.90N 002 16.25E"),
+        (-33.8688, 151.2093, 25, 271, 6, False, 58, "Hello", "33 52.13S 151 12.56E"),
+        (40.7128, -74.0060, 5, 90, 0, False, None, "", "40 42.77N 074 00.36W"),
+        (51.5, -0.1276, 799, 359, 3, True, -12, "x", "51 30.00N 000 07.66W"),
+        (10.0, 105.5, 12, 0, 5, False, 1234, "", "10 00.00N 105 30.00E"),
+        (1.0, -179.99, 100, 180, 1, False, None, "", "01 00.00N 179 59.40W"),
+    ]
+    for lat, lon, sp, crs, msg, cu, alt, com, want in cases:
+        f = encode("F4HWN-7", lat, lon, sp, crs, "[/", msg, cu, com, alt_m=alt)
+        i, end = info_start(f)
+        r1, r2, r3 = draw_mice(f, i, end)
+        kmh = (sp * 1897) >> 10
+        m = ("Custom-%d" % (7 - msg)) if cu and msg else MSG[msg]
+        w2 = "%dkm/h %d [/ %s" % (kmh, crs, m)
+        w3 = ("%dm " % alt if alt is not None else "") + com
+        good = (r1, r2, r3) == (want, w2, w3) and all(len(r) <= 32 for r in (r1, r2, r3))
+        ok &= good
+        print("OK  " if good else "FAIL", (r1, r2, r3), "" if good else (want, w2, w3))
+    # standard positions (aprsrx_app.c drawPos)
+    pos_cases = [
+        ("F1PRY-14", "@300158z4921.07N/00150.50EN APRS OISE V=12.5V",
+         ("49 21.07N 001 50.50E", "300158z /N  APRS OISE V=12.5V", "")),
+        ("F4HWN", "!4850.90N/00216.25E-UV-K5 APRS RX test",
+         ("48 50.90N 002 16.25E", "/- UV-K5 APRS RX test", "")),
+        ("F4HWN", "=4850.90S\\12345.67W>" + "x" * 60,
+         ("48 50.90S 123 45.67W", "\\> " + "x" * 29, "x" * 31)),
+        ("F4HWN", "!/5L!!<*e7>7P[", None),            # compressed: raw text
+        ("F4HWN", "!4850.90N/00216.25", None),        # too short
+        ("F4HWN", ">status text", None),
+    ]
+    for call, info, want in pos_cases:
+        f = _frame(call, "APZK5", (), info.encode("latin-1"))
+        i, end = info_start(f)
+        got = draw_pos(f, i, end)
+        good = got == want and (got is None or all(len(r) <= 32 for r in got))
+        ok &= good
+        print("OK  " if good else "FAIL", got, "" if good else want)
+    print("ALL OK" if ok else "FAILURES")
+    return 0 if ok else 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/App/apps/aprsrx/test/model_rx.py b/App/apps/aprsrx/test/model_rx.py
new file mode 100644
index 00000000..6e6cfd20
--- /dev/null
+++ b/App/apps/aprsrx/test/model_rx.py
@@ -0,0 +1,328 @@
+#!/usr/bin/env python3
+"""Pure-Python model of the APRS receive chain, and the integer demodulator the
+radio app will run (written to be transliterated to C: ints, shifts, no division).
+
+Chain: source (Flipper square-wave FSK from the .sub durations, or a real
+station's sine AFSK with a given twist) -> discriminator output in Hz + offset +
+white noise -> radio audio path (RAW: 5 kHz low-pass as in EPIRB 406; STD: 300 Hz
+high-pass, 750 us de-emphasis, 3 kHz low-pass) -> 12-bit ADC on PA4 around 2048 at
+9.6 kHz (optional clock error) -> Demod -> frames.
+
+Demod (per ADC sample):
+  DC removal -> band-pass -> 4 sliding correlators over one bit (8 samples):
+  I/Q at 1200 and 2200 Hz -> magnitudes (max + 3/8 min) -> per-tone peak AGC
+  -> 3 slicers, decision sign(wa*Mm*Ps - wb*Ms*Pm) with wa:wb = 2:3, 1:1, 3:2,
+  each with its own DPLL (16-bit phase per bit, nudged 1/4 toward mid-bit on
+  each transition), NRZI, HDLC (flag, destuff, abort), FCS and UI check.
+
+  model_rx.py            runs the test sweep, prints a table
+"""
+import math, os, random, sys
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from ax25 import test_frames, hdlc_bits, crc16, decode
+from flipper_aprs import nrzi_tones, edges
+
+FS_SIM = 96000
+FS_ADC = 9600
+BIAS = 2048
+LSB_PER_HZ = 0.065      # measured on the K1 (EPIRB 406 lab): ~2.3 kHz -> ~150 LSB
+FLIPPER_DEV = 2380.0
+
+
+# ---------------------------------------------------------------- channel ----
+
+def flipper_wave(frame):
+    """Discriminator output (Hz) of the Flipper square-wave FSK, box-averaged
+    per simulation sample from the exact (rounded to us, as in the .sub) edges."""
+    ed, end = edges(nrzi_tones(hdlc_bits(frame)))
+    ed = [float(round(t)) for t in ed]
+    n = int(end * 1e-6 * FS_SIM)
+    T = 1e6 / FS_SIM
+    out, lv, k = [], 1, 0
+    for i in range(n):
+        t0, t1 = i * T, (i + 1) * T
+        acc, t = 0.0, t0
+        while k < len(ed) and ed[k] < t1:
+            acc += (ed[k] - t) * (1 if lv else -1)
+            t = ed[k]
+            lv ^= 1
+            k += 1
+        acc += (t1 - t) * (1 if lv else -1)
+        out.append(FLIPPER_DEV * acc / T)
+    return out
+
+
+def sine_wave(frame, dev=3000.0, twist_db=0.0):
+    """A real station: phase-continuous sine AFSK, space tone twist_db louder."""
+    tones = nrzi_tones(hdlc_bits(frame))
+    spb = FS_SIM / 1200.0
+    out, ph = [], 0.0
+    lead = [0.0] * int(0.1 * FS_SIM)
+    a_space = dev * 10 ** (twist_db / 20)
+    for i in range(int(len(tones) * spb)):
+        f = tones[int(i / spb)]
+        ph += f / FS_SIM
+        out.append((dev if f == 1200.0 else a_space) * math.sin(2 * math.pi * ph))
+    return lead + out
+
+
+def biquad_lp(x, fc):
+    w = math.tan(math.pi * fc / FS_SIM)
+    q = 1 / math.sqrt(2)
+    n = 1 / (1 + w / q + w * w)
+    b0 = w * w * n; b1 = 2 * b0; a1 = 2 * (w * w - 1) * n; a2 = (1 - w / q + w * w) * n
+    y, x1, x2, y1, y2 = [], 0.0, 0.0, 0.0, 0.0
+    for v in x:
+        o = b0 * v + b1 * x1 + b0 * x2 - a1 * y1 - a2 * y2
+        x2, x1, y2, y1 = x1, v, y1, o
+        y.append(o)
+    return y
+
+
+def rc_hp(x, fc):
+    a = math.exp(-2 * math.pi * fc / FS_SIM)
+    y, acc, prev = [], 0.0, 0.0
+    for v in x:
+        acc = a * (acc + v - prev)
+        prev = v
+        y.append(acc)
+    return y
+
+
+def deemph(x, tau_us=750.0, ref_hz=1200.0):
+    """1-pole de-emphasis, unity gain at ref_hz."""
+    k = 1 - math.exp(-1 / (FS_SIM * tau_us * 1e-6))
+    g = math.sqrt(1 + (2 * math.pi * ref_hz * tau_us * 1e-6) ** 2)
+    y, acc = [], 0.0
+    for v in x:
+        acc += k * (v - acc)
+        y.append(acc * g)
+    return y
+
+
+def channel(sig, mode="raw", noise_hz=0.0, off_hz=0.0, ppm=0.0, seed=1,
+            gap_ms=150):
+    rnd = random.Random(seed)
+    gap = int(gap_ms * 1e-3 * FS_SIM)
+    # no carrier around the burst: the discriminator outputs full-scale noise
+    x = [rnd.gauss(0, 6000) for _ in range(gap)]
+    x += [v + off_hz + rnd.gauss(0, noise_hz) for v in sig]
+    x += [rnd.gauss(0, 6000) for _ in range(gap)]
+    if mode == "raw":
+        x = rc_hp(biquad_lp(x, 5000), 30)
+    else:
+        x = biquad_lp(deemph(rc_hp(x, 300)), 3000)
+    step = FS_SIM / FS_ADC * (1 + ppm * 1e-6)
+    out, p = [], 0.0
+    while p < len(x) - 1:
+        i = int(p); f = p - i
+        v = x[i] * (1 - f) + x[i + 1] * f
+        out.append(min(4095, max(0, int(round(BIAS + LSB_PER_HZ * v + rnd.gauss(0, 1))))))
+        p += step
+    return out
+
+
+# ------------------------------------------------------ integer demodulator --
+
+def _tab(f, fs):
+    per = fs // math.gcd(fs, int(f))
+    c = [int(round(127 * math.cos(2 * math.pi * f * n / fs))) for n in range(per)]
+    s = [int(round(127 * math.sin(2 * math.pi * f * n / fs))) for n in range(per)]
+    return c, s
+
+
+def is_ui(f):
+    """An APRS frame is a UI frame: the address field ends (bit 0 of an SSID
+    byte) and is followed by control 0x03 and PID 0xF0. Rejects the rare noise
+    burst that passes the 16-bit FCS in continuous decoding."""
+    end = len(f) - 2
+    e = 13
+    while not (f[e] & 1) and e + 7 < end:
+        e += 7
+    return bool(f[e] & 1) and e + 2 < end and f[e + 1] == 0x03 and f[e + 2] == 0xF0
+
+
+class Slicer:
+    """One decision threshold + its own DPLL and HDLC. The decision is
+    sign(wa*Mm*Ps - wb*Ms*Pm): wa/wb != 1 favours one tone, which recovers
+    frames whose twist the per-tone AGC does not fully cancel (Direwolf's
+    multi-slicer idea)."""
+    def __init__(self, dm, wa, wb):
+        self.dm, self.wa, self.wb = dm, wa, wb
+        self.dprev = 0; self.phase = 0; self.last = 0
+        self.sr = 0; self.ones = 0; self.byte = 0; self.nb = 0
+        self.buf = bytearray(); self.inframe = False
+        self.good = 0
+
+    def step(self, a, b):
+        dm = self.dm
+        d = a * self.wa - b * self.wb
+        # DPLL: sample at phase wrap (mid-bit), transitions pulled to mid-phase
+        self.phase += dm.step
+        if (d > 0) != (self.dprev > 0):
+            self.phase += (dm.ctr - self.phase) >> dm.pll
+        self.dprev = d
+        if self.phase >= 65536:
+            self.phase -= 65536
+            lv = 1 if d > 0 else 0
+            self.bit(1 if lv == self.last else 0)
+            self.last = lv
+
+    def bit(self, b):
+        self.sr = (self.sr >> 1) | (b << 7)
+        if self.sr == 0x7E:
+            if self.inframe and len(self.buf) >= 18 and \
+                    crc16(self.buf[:-2]) == self.buf[-2] | (self.buf[-1] << 8) and \
+                    is_ui(self.buf):
+                self.good += 1
+                self.dm.frame(bytes(self.buf))
+            self.buf = bytearray(); self.inframe = True
+            self.ones = self.byte = self.nb = 0
+            return
+        if b:
+            self.ones += 1
+            if self.ones > 6:                   # abort / noise: wait for a flag
+                self.inframe = False
+                return
+        else:
+            if self.ones == 5:                  # stuffed zero
+                self.ones = 0
+                return
+            self.ones = 0
+        if not self.inframe:
+            return
+        self.byte |= b << self.nb
+        self.nb += 1
+        if self.nb == 8:
+            if len(self.buf) < 330:
+                self.buf.append(self.byte)
+            else:
+                self.inframe = False
+            self.byte = self.nb = 0
+
+
+class Demod:
+    def __init__(self, fs=FS_ADC, agc=True, bp=True, att=5, dec=10, pll=2, ctr=36864,
+                 slicers=((2, 3), (1, 1), (3, 2))):
+        self.ctr, self.bp, self.att, self.dec, self.pll = ctr, bp, att, dec, pll
+        # 2nd-order band-pass (RBJ, constant 0 dB peak) centred on
+        # sqrt(1200*2200) = 1625 Hz, Q = 0.9: coefficients in Q14
+        w0 = 2 * math.pi * 1625 / fs
+        al = math.sin(w0) / (2 * 0.9)
+        a0 = 1 + al
+        self.b0 = int(round(al / a0 * 16384))
+        self.a1 = int(round(-2 * math.cos(w0) / a0 * 16384))
+        self.a2 = int(round((1 - al) / a0 * 16384))
+        self.x1 = self.x2 = self.y1 = self.y2 = 0
+        self.N = fs // 1200                    # correlation window = one bit
+        self.cm, _ = _tab(1200, fs)            # 8 entries at 9.6 kHz
+        self.cs, _ = _tab(2200, fs)            # 48 entries at 9.6 kHz
+        self.im = self.qm = self.is_ = self.qs = 0
+        self.ring = [[0, 0, 0, 0] for _ in range(self.N)]
+        self.r = 0; self.km = 0; self.ks = 0
+        self.dc = BIAS << 4
+        self.pm = self.ps = 64
+        self.agc = agc
+        self.step = (65536 * 1200 + fs // 2) // fs
+        self.sl = [Slicer(self, wa, wb) for wa, wb in slicers]
+        self.frames = []
+        self.maxab = 0
+
+    def frame(self, f):
+        if f not in self.frames:                # the same frame from several slicers
+            self.frames.append(f)
+
+    @staticmethod
+    def mag(i, q):
+        a, b = abs(i), abs(q)
+        if a < b: a, b = b, a
+        return a + (b >> 2) + (b >> 3)
+
+    def sample(self, adc):
+        self.dc += ((adc << 4) - self.dc) >> 6
+        x = adc - (self.dc >> 4)
+        if self.bp:
+            y = (self.b0 * (x - self.x2) - self.a1 * self.y1 - self.a2 * self.y2) >> 14
+            self.x2, self.x1, self.y2, self.y1 = self.x1, x, self.y1, y
+            x = y
+        # sin = cos read 3/4 period ahead: +6 of 8 (1200 Hz), +12 of 48 (2200 Hz:
+        # 11 cycles per 48 samples, 12 samples = 2.75 cycles)
+        cm, cs = self.cm, self.cs
+        p = ((x * cm[self.km]) >> 8, (x * cm[(self.km + 6) & 7]) >> 8,
+             (x * cs[self.ks]) >> 8, (x * cs[(self.ks + 12) % 48]) >> 8)
+        o = self.ring[self.r]
+        self.im += p[0] - o[0]; self.qm += p[1] - o[1]
+        self.is_ += p[2] - o[2]; self.qs += p[3] - o[3]
+        self.ring[self.r] = p
+        self.r = (self.r + 1) % self.N
+        self.km = (self.km + 1) % len(self.cm)
+        self.ks = (self.ks + 1) % len(self.cs)
+        mm, ms = self.mag(self.im, self.qm), self.mag(self.is_, self.qs)
+        if self.agc:
+            self.pm += (mm - self.pm) >> self.att if mm > self.pm else -(self.pm >> self.dec)
+            self.ps += (ms - self.ps) >> self.att if ms > self.ps else -(self.ps >> self.dec)
+            if self.pm < 16: self.pm = 16
+            if self.ps < 16: self.ps = 16
+            a, b = mm * self.ps, ms * self.pm
+        else:
+            a, b = mm, ms
+        if a > self.maxab: self.maxab = a
+        if b > self.maxab: self.maxab = b
+        for s in self.sl:
+            s.step(a, b)
+
+
+def run(adc, **kw):
+    d = Demod(**kw)
+    for s in adc:
+        d.sample(s)
+    return d.frames
+
+
+# ------------------------------------------------------------------ sweep ----
+
+def main():
+    fr = test_frames()
+    waves = {}
+    def wave(name, src, twist=0.0):
+        key = (name, src, twist)
+        if key not in waves:
+            waves[key] = flipper_wave(fr[name]) if src == "flipper" \
+                else sine_wave(fr[name], twist_db=twist)
+        return waves[key]
+
+    cases = []
+    for mode in ("raw", "std"):
+        for name in ("pos", "long", "badfcs"):
+            cases.append(("flipper", 0.0, mode, name, 0, 0, 0))
+        for noise in (1500, 3000, 4500, 6000):
+            cases.append(("flipper", 0.0, mode, "pos", noise, 0, 0))
+        for off in (-4000, 4000):
+            cases.append(("flipper", 0.0, mode, "pos", 1500, off, 0))
+        for ppm in (-10000, 10000):
+            cases.append(("flipper", 0.0, mode, "long", 1500, 0, ppm))
+        for tw in (-6.0, 0.0, 6.0):
+            cases.append(("sine", tw, mode, "pos", 1500, 0, 0))
+
+    print("%-7s %5s %-4s %-6s %6s %6s %7s | %-7s %-7s" %
+          ("source", "twist", "mode", "frame", "noise", "off", "ppm", "agc", "no-agc"))
+    for src, tw, mode, name, noise, off, ppm in cases:
+        oks = []
+        for seed in (1, 2, 3):
+            adc = channel(wave(name, src, tw), mode, noise, off, ppm, seed)
+            for agc in (True, False):
+                got = run(adc, agc=agc)
+                want = [] if name == "badfcs" else [fr[name]]
+                oks.append((agc, got == want))
+        res = ["%d/3" % sum(ok for a, ok in oks if a == agc) for agc in (True, False)]
+        print("%-7s %5.0f %-4s %-6s %6d %6d %7d | %-7s %-7s" %
+              (src, tw, mode, name, noise, off, ppm, res[0], res[1]))
+
+
+if __name__ == "__main__":
+    if len(sys.argv) > 1 and sys.argv[1] == "--one":
+        f = test_frames()["pos"]
+        got = run(channel(flipper_wave(f)))
+        print([decode(g) for g in got])
+    else:
+        main()
diff --git a/App/apps/aprsrx/test/variants.py b/App/apps/aprsrx/test/variants.py
new file mode 100644
index 00000000..5c6d9ed0
--- /dev/null
+++ b/App/apps/aprsrx/test/variants.py
@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+"""Compare demodulator variants on the hard cases of the sweep (dev tool).
+Run from a file (multiprocessing re-imports __main__)."""
+import os, sys
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from multiprocessing import Pool
+from model_rx import *
+
+FR = test_frames()
+CASES = []
+for mode in ("raw", "std"):
+    for noise in (3000, 4000):
+        CASES.append(("flipper", 0.0, mode, "pos", noise, 0, 0))
+    CASES.append(("flipper", 0.0, mode, "long", 2000, 0, 10000))
+    CASES.append(("flipper", 0.0, mode, "long", 2000, 0, -10000))
+    for tw in (-9.0, -6.0, -3.0, 0.0, 3.0, 6.0, 9.0):
+        CASES.append(("sine", tw, mode, "pos", 2500, 0, 0))
+    CASES.append(("flipper", 0.0, mode, "badfcs", 1000, 0, 0))
+
+VARIANTS = {
+    "s1":       dict(slicers=((1, 1),)),
+    "s3x2":     dict(slicers=((1, 2), (1, 1), (2, 1))),
+    "s3x1.5":   dict(slicers=((2, 3), (1, 1), (3, 2))),
+    "s5":       dict(slicers=((1, 2), (2, 3), (1, 1), (3, 2), (2, 1))),
+    "s3x3":     dict(slicers=((1, 3), (1, 1), (3, 1))),
+}
+SEEDS = (1, 2, 3, 4)
+
+
+def job(c):
+    src, tw, mode, name, noise, off, ppm = c
+    w = flipper_wave(FR[name]) if src == "flipper" else sine_wave(FR[name], twist_db=tw)
+    row, mx = [], 0
+    for seed in SEEDS:
+        adc = channel(w, mode, noise, off, ppm, seed)
+        want = [] if name == "badfcs" else [FR[name]]
+        r = []
+        for kw in VARIANTS.values():
+            d = Demod(**kw)
+            for s in adc:
+                d.sample(s)
+            r.append(d.frames == want)
+            mx = max(mx, d.maxab)
+        row.append(r)
+    return c, [sum(r[i] for r in row) for i in range(len(VARIANTS))], mx
+
+
+if __name__ == "__main__":
+    with Pool() as p:
+        res = p.map(job, CASES)
+    names = list(VARIANTS)
+    print("%-40s " % "case" + " ".join("%6s" % n for n in names))
+    tot = [0] * len(names)
+    mx = 0
+    for c, r, m in res:
+        print("%-40s " % (" ".join(str(x) for x in c)) + " ".join("%6d" % x for x in r))
+        tot = [a + b for a, b in zip(tot, r)]
+        mx = max(mx, m)
+    print("%-40s " % ("TOTAL /%d" % (len(CASES) * len(SEEDS))) + " ".join("%6d" % x for x in tot))
+    print("max(Mm*Ps, Ms*Pm) = %d  (x3 = %d, int32 max 2147483647)" % (mx, 3 * mx))
diff --git a/App/apps/aprstx/README.md b/App/apps/aprstx/README.md
new file mode 100644
index 00000000..82d5cfd2
--- /dev/null
+++ b/App/apps/aprstx/README.md
@@ -0,0 +1,100 @@
+# APRS TX: on-radio APRS position beacon (work in progress)
+
+Sends one APRS position frame (AX.25 UI frame, Bell 202 AFSK 1200 bauds) on the
+TX VFO at each press of PTT or MENU. Companion of [APRS RX](../aprsrx/README.md),
+which is also the test receiver.
+
+| Step | State |
+|---|---|
+| Frame and bit stream model (`test/tx_model.py`) | **Done**: identical to the RX app's AX.25 reference, decoded by the RX model |
+| Radio app (`aprstx_app.c`) | **v0.1 works on the radio** (2026-09-30); v0.2 edits the position on the radio, frequency bottom right as Beacon (builds: 2812 B; radio test pending) |
+| On-air test: APRS RX on a second radio, FT3D | **Done** (2026-09-30, v0.1: frames received by a UV-K1 running APRS RX and by the FT3D, first try, default level 66 and twist 0) |
+
+## Station settings (`gen_assets.py`, then rebuild)
+
+| Setting | Default |
+|---|---|
+| Source | the boot-message callsign (API `boot_callsign`, 1-6 letters/digits) + `SSID` = 7 |
+| `DEST` | `APZK5` (APZ = experimental software) |
+| `PATH` | `WIDE1-1` (0 to 2 entries) |
+| `LAT`, `LON` | `4850.90N`, `00216.25E`: the **default** position, until one is edited on the radio (key 5) |
+| `SYMBOL` | `/[` (person) |
+| `COMMENT` | `UV-K5 APRS TX` (43 characters at most) |
+
+Frame sent: `F4HWN-7>APZK5,WIDE1-1:!4850.90N/00216.25E[UV-K5 APRS TX` (58 bytes,
+~0.73 s on the air: 50 ms of tone settle, 40 flags = 267 ms, the frame, 3 flags).
+If the boot message is not a plain callsign (empty, more than 6 characters once
+spaces are dropped, or with a `/`), the app shows `No boot callsign` and does not
+transmit.
+
+## Keys (UV-K5 and UV-K1)
+
+| Key | Action |
+|---|---|
+| PTT or MENU | Send one frame |
+| UP / DOWN | Tone level (deviation): REG_70 gain 10-127, step 4, default 66 (the firmware's tone gain) |
+| 1 / 3 | Twist `tw` -4..+8: 2200 Hz gain = level × (8 + tw) / 8 (-6..+6 dB) |
+| 5 | Edit the position |
+| EXIT | Quit (level, twist and position are saved) |
+
+### Position editor (v0.2)
+
+```
+
+LAT  48 50.90 N
+       ^
+LON 002 16.25 E
+0-9 digit  * N/S E/W
+UP/DN move  MENU ok  EXIT
+```
+
+Type the 13 digits in a row, as a frequency: `485090` then `0021625` (degrees,
+minutes, hundredths of a minute: the APRS format, read as is from a GPS or
+aprs.fi in degrees-minutes). The cursor skips the separators and goes on from
+the latitude to the longitude.
+
+| Key | Action |
+|---|---|
+| 0-9 | Digit at the cursor, then the next one |
+| * | N/S (on the latitude) or E/W (on the longitude) |
+| UP / DOWN | Move the cursor (to fix one digit) |
+| MENU | Check (degrees ≤ 90 / 180, minutes < 60) and keep: the frame is rebuilt; `Invalid position` otherwise |
+| EXIT | Cancel |
+
+The position is saved on exit with the level and twist (`cfg_save`, 10 bytes:
+magic 0xA8, level, twist, 13 digits and the hemispheres in nibbles). A v0.1
+config (magic 0xA7) is ignored: defaults.
+
+## How it transmits
+
+As the Beacon app keys MCW: `tx_set_params` (carrier + PA on the TX VFO),
+REG_51 = 0 (no CTCSS/DCS under the AFSK), `tx_tone(1200)` (tone path on, mic ADC
+off, 50 ms settle). Then each bit is timed from SysTick, 40000 cycles at 48 MHz
+(exact), and at each NRZI transition the tone frequency REG_71 (1200 Hz = 12389,
+2200 Hz = 22714, the driver's `scale_freq`) and gain REG_70 are rewritten: two
+SPI writes, a few tens of µs out of 833. `tx_mute` + `tx_end` restore RX.
+
+## Unknowns for the first on-air test (all fine with the defaults on 2026-09-30)
+
+1. **Phase continuity** when REG_71 is rewritten (an NCO keeps it, probably).
+   The RX model decodes even with a phase reset at every transition (3/3 clean,
+   2/3 with noise in STD); a hardware TNC such as the FT3D may be stricter.
+2. **Twist.** The tone probably enters after the pre-emphasis, so the signal is
+   flat and a receiver with de-emphasis sees 2200 Hz ~5 dB low. If the FT3D
+   misses frames that APRS RX decodes, raise `tw` (key 3): +4 is +3.5 dB.
+3. **Deviation** at level 66: aim for ~3 kHz; UP/DOWN.
+
+## Test plan
+
+1. Simplex test frequency (not 144.800 for the first frames), low power.
+2. Receivers: APRS RX on a second radio (its per-slicer counters `s a/b/c`
+   show the twist: frames only on the space-favouring slicer = 2200 Hz low) and
+   the FT3D (APRS on band B, same frequency).
+3. PTT, check both; adjust level and twist; then 144.800.
+
+`test/tx_model.py` (needs `../aprsrx/test`): frame from the real assets vs
+`ax25.build`, bit stream vs `ax25.hdlc_bits`, bad boot callsigns refused, an
+edited position (south/west) vs `ax25.build`, the config round trip, the editor
+rows and caret, the position limits, then
+AFSK (continuous phase or reset, tw 0/+4, TX path twist 0/+5 dB) decoded by the
+RX model through its RAW and STD audio paths, with and without noise.
diff --git a/App/apps/aprstx/app.ld b/App/apps/aprstx/app.ld
new file mode 100644
index 00000000..f04a2ec7
--- /dev/null
+++ b/App/apps/aprstx/app.ld
@@ -0,0 +1,43 @@
+/* Overlay-app link script (POC).
+ *
+ * The blob is linked to run at the PY25Q16 sector-cache overlay VMA (shared with
+ * the multiboot RAM stub — never both active at once). Code + rodata + data +
+ * bss must all fit in the 4 KiB overlay. objcopy -O binary emits text+rodata+
+ * data only; the loader zeroes the overlay before copying, so bss starts clean.
+ *
+ * VMA must match ADDR(.mb_workspace) in Core/py32f071xb.ld. If the firmware RAM
+ * layout shifts, update APP_VMA and the loader's compile-time assert catches a
+ * mismatch. */
+
+/* APP_VMA is the target firmware's __mb_workspace_start (read from its .map). It
+ * varies with the RAM layout, so pass it from the build: -Wl,--defsym,APP_VMA=0x...
+ * The default is only a fallback for a standalone size check. */
+APP_VMA    = DEFINED(APP_VMA) ? APP_VMA : 0x20000280;
+APP_LENGTH = 0x1000;       /* 4 KiB sector-cache overlay                        */
+
+ENTRY(app_main)
+
+MEMORY {
+    APP (rwx) : ORIGIN = APP_VMA, LENGTH = APP_LENGTH
+}
+
+SECTIONS {
+    .app APP_VMA : {
+        KEEP(*(.text.entry))      /* app_main pinned to offset 0 */
+        *(.text .text.*)
+        *(.rodata .rodata.*)
+        . = ALIGN(4);
+        *(.data .data.*)
+        . = ALIGN(4);
+        __app_bss_start = .;
+        *(.bss .bss.* COMMON)
+        . = ALIGN(4);
+        __app_bss_end = .;
+    } > APP
+
+    __app_end = .;
+    ASSERT(__app_end <= APP_VMA + APP_LENGTH,
+           "APRS TX overlay app overflows the 4 KiB overlay")
+
+    /DISCARD/ : { *(.ARM.exidx*) *(.ARM.extab*) *(.eh_frame*) *(.comment) *(.note.*) }
+}
diff --git a/App/apps/aprstx/aprstx_app.c b/App/apps/aprstx/aprstx_app.c
new file mode 100644
index 00000000..c526c664
--- /dev/null
+++ b/App/apps/aprstx/aprstx_app.c
@@ -0,0 +1,431 @@
+/* Copyright 2026 Armel F4HWN
+ * https://github.com/armel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+/*
+ * APRS TX - sends one APRS position frame (AX.25 UI frame, Bell 202 AFSK
+ * 1200 bauds) on the TX VFO at each press of PTT or MENU.
+ *
+ * The source is the boot-message callsign (API boot_callsign) with the SSID of
+ * gen_assets.py; destination, path, symbol and comment are AX.25-encoded there
+ * too (assets). The position is edited on the radio (key 5: 13 digits typed in
+ * a row, as a frequency) and saved; gen_assets.py holds the default. The frame
+ * is built at launch and after each edit, FCS included.
+ *
+ * AFSK comes from the BK4829 tone generator, as the Beacon app keys MCW: the tone
+ * frequency (REG_71) is rewritten at each NRZI transition, 1200 Hz mark / 2200 Hz
+ * space, bits timed to the cycle (40000 cycles at 48 MHz) from SysTick. The
+ * mic ADC is off while a tone is sent; any CTCSS/DCS of the VFO is cleared
+ * (REG_51) so nothing rides under the AFSK. test/tx_model.py mirrors the frame
+ * and bit stream and decodes them with the APRS RX model.
+ *
+ * Keys (UV-K5 and UV-K1): PTT or MENU send · UP/DOWN tone level (deviation,
+ *   REG_70 gain 10-127) · 1/3 twist: 2200 Hz gain = level x (8 + tw) / 8,
+ *   tw -4..+8 (-6..+6 dB), for a receiver's de-emphasis · 5 edit the position
+ *   · EXIT quit.
+ * Position editor: 0-9 type a digit (the cursor skips the separators and moves
+ *   on) · * toggle N/S or E/W on the cursor's line · UP/DOWN move the cursor ·
+ *   MENU check and keep · EXIT cancel.
+ * Level, twist and position are saved on exit (cfg_save, 10 bytes).
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "../app_api.h"
+#include "aprstx_assets.h"     /* generated by gen_assets.py */
+
+/* ---- SysTick (core at 48 MHz, 10 ms period) ---- */
+#define SYST_LOAD   (*(volatile uint32_t *)0xE000E014u)
+#define SYST_VAL    (*(volatile uint32_t *)0xE000E018u)
+#define CYC_PER_BIT (48000000u / 1200u)   /* 40000: exact */
+
+/* ---- BK4829 ---- */
+#define REG_51      0x51   /* sub-audio: 0 = no CTCSS/DCS (BK4819_ExitSubAu)   */
+#define REG_70      0x70   /* tone 1: <15> enable, <14:8> gain                */
+#define REG_71      0x71   /* tone 1 frequency, Hz x 10.32444                 */
+#define F_MARK      12389u /* 1200 Hz: (f * 1353245 + 2^16) >> 17, scale_freq */
+#define F_SPACE     22714u /* 2200 Hz                                         */
+
+#define LVL_DEF     66     /* BK4819_TransmitTone's tone gain                 */
+#define LVL_MIN     10
+#define LVL_MAX     127
+#define LVL_STEP    4
+#define TW_MIN      (-4)   /* 2200 Hz gain x 0.5 (-6 dB)                      */
+#define TW_MAX      8      /* 2200 Hz gain x 2 (+6 dB)                        */
+
+/* ---- AX.25 ---- */
+#define TXDELAY_FLAGS 40u  /* 267 ms of flags before the frame                */
+#define TAIL_FLAGS  3u
+#define CALL_MAX    6u
+#define INFO_LEN    (1u + 8u + 1u + 9u + 1u + F_COMMENT_LEN)   /* !lat/lon[comment */
+#define FRAME_MAX   (7u + 7u + F_PATH_LEN + 2u + INFO_LEN + 2u)
+
+/* position: 13 digits DDMMhh DDDMMhh, hemispheres bit 0 south, bit 1 west */
+#define POS_DIGITS  13u
+#define LAT_DIGITS  6u
+#define TX_CAPS_X   40u    /* "TRANSMIT" capsule in the status bar, after the title */
+#define CFG_MAGIC   0xA8u  /* 0xA7 (v0.1: level and twist only) is ignored */
+#define CFG_LEN     10u    /* magic, level, twist, 13 digits + hemispheres in nibbles */
+
+enum { ST_IDLE = 0, ST_TX, ST_DENIED, ST_NOCALL, ST_BADPOS };
+
+/* The app state in one struct: a function loads one base address instead of one
+ * literal-pool word per global. Words, then bytes. The loader zeroes the overlay
+ * (.bss) at every launch. */
+static struct {
+    const app_api_t *A;
+    uint8_t *frm;                      /* the frame (app_main's stack)            */
+    uint32_t tPrev, tCyc, next;        /* SysTick cycle counter, next bit edge    */
+    uint16_t sent;                     /* frames sent                             */
+    uint8_t  flen, prevKey, space, ones, lvl, status;
+    int8_t   tw;
+    bool     running, edit;
+    uint8_t  hemi, ehemi, cur;         /* hemispheres, edited ones, cursor digit  */
+    uint8_t  pos[POS_DIGITS];          /* the position sent                       */
+    uint8_t  ed[POS_DIGITS];           /* the position being edited               */
+} g;
+static char str[34];
+
+/* ---- tiny freestanding helpers: GCC may turn small copies into calls ---- */
+void *memset(void *d, int c, size_t n) {
+    uint8_t *p = d; while (n--) *p++ = (uint8_t)c; return d;
+}
+void *memcpy(void *d, const void *s, size_t n) {
+    uint8_t *p = d; const uint8_t *q = s; while (n--) *p++ = *q++; return d;
+}
+
+/* ---- formatting ---- */
+static char *put(char *o,const char *s){ while(*s)*o++=*s++; return o; }
+/* Formatting by repeated subtraction: no division. Values printed stay below 100000. */
+static uint8_t sub(uint32_t *v,uint32_t d){ uint8_t q=0; while(*v>=d){ *v-=d; q++; } return q; }
+static const uint16_t P10[]={10000u,1000u,100u,10u,1u};
+static char *puti(char *o,int32_t v){
+    uint32_t u;
+    if(v<0){*o++='-';u=(uint32_t)(-v);} else u=(uint32_t)v;
+    bool lead=false;
+    for(uint8_t i=0;i<5;i++){
+        uint8_t c=sub(&u,P10[i]);
+        if(c||lead||i==4u){ *o++=(char)('0'+c); lead=true; }
+    }
+    return o;
+}
+/* A tiny row holds 32 characters (4 px each): print_tiny does not clip, so
+ * every row built below stays within that. */
+static void tiny(uint8_t y,char *end){ *end='\0'; g.A->print_tiny(str,0,y,false,true); }
+/* The frequency (10 Hz units) drawn as the main screen draws it (ui/main.c,
+ * ENABLE_BIG_FREQ): the big digits up to the kHz on lines 4-5, the last two
+ * digits in the small font on line 5 right after them (from 1 GHz, the whole
+ * string in the big font), the group centred. Big digits are 13 px (drawn from
+ * +2), the point 3 px: the group shows (n big digits x 13 + 14) px. No division. */
+static void drawFreq(uint32_t f){
+    const app_api_t *A=g.A;
+    uint16_t m=0;
+    while(f>=100000u){ f-=100000u; m++; }
+    char *o=puti(str,m);
+    *o++='.';
+    for(uint8_t i=0;i<5u;i++) *o++=(char)('0'+sub(&f,P10[i]));
+    *o='\0';
+    uint8_t n=(uint8_t)(o-str), big=(uint8_t)(n-3u);    /* digits before "00" */
+    if(m>=1000u){ A->print_string(str,(uint8_t)((128u-n*8u)>>1),0,4,8); return; }
+    uint8_t x=(uint8_t)(((128u-(big*13u+14u))>>1)-2u);
+    A->print_normal(str+n-2u,(uint8_t)(x+big*13u+3u),0,5);   /* "00"      */
+    str[n-2u]='\0';
+    A->display_freq(str,x,4,false);                          /* "144.800" */
+}
+/* AX.25 address field -> "F4HWN-7" */
+static char *putCall(char *o,const uint8_t *a){
+    for(uint8_t i=0;i<6u;i++){ char c=(char)(a[i]>>1); if(c!=' ') *o++=c; }
+    uint8_t ssid=(uint8_t)((a[6]>>1)&15u);
+    if(ssid){ *o++='-'; o=puti(o,ssid); }
+    return o;
+}
+
+/* ---- position ---- */
+/* "4850.90N" (6 digits) or "00216.25E" (7 digits), as APRS sends it */
+static uint8_t *putCoord(uint8_t *o,const uint8_t *d,uint8_t n,char h){
+    for(uint8_t i=0;i<n;i++){ if(i==n-2u) *o++='.'; *o++=(uint8_t)('0'+d[i]); }
+    *o++=(uint8_t)h;
+    return o;
+}
+/* degrees <= 90 / 180 (and nothing beyond), minutes < 60 */
+static bool posOk(const uint8_t *d){
+    uint8_t la=(uint8_t)(d[0]*10u+d[1]), lam=(uint8_t)(d[2]*10u+d[3]);
+    uint8_t lom=(uint8_t)(d[9]*10u+d[10]);
+    uint16_t lo=(uint16_t)(d[6]*100u+d[7]*10u+d[8]);
+    for(uint8_t i=0;i<POS_DIGITS;i++) if(d[i]>9u) return false;
+    if(la>90u || lam>59u || lo>180u || lom>59u) return false;
+    if(la==90u && (lam|d[4]|d[5])) return false;
+    if(lo==180u && (lom|d[11]|d[12])) return false;
+    return true;
+}
+
+/* ---- the frame: dest, source (boot callsign + SSID), path, UI, info, FCS ---- */
+static void build(void){
+    const app_api_t *A=g.A;
+    uint8_t *f=g.frm;
+    char call[12];
+    A->boot_callsign(call,sizeof call);
+    uint8_t n=0;
+    while(call[n]){ if(call[n]=='/') return; n++; }   /* AX.25: letters and digits */
+    if(!n || n>CALL_MAX) return;                      /* flen stays 0: no TX        */
+
+    A->asset_read(F_DEST,f,F_DEST_LEN);
+    for(uint8_t i=0;i<6u;i++) f[7+i]=(uint8_t)((i<n?call[i]:' ')<<1);
+    f[13]=(uint8_t)(0x60u|(CFG_SSID<<1)|(F_PATH_LEN?0u:1u));   /* end bit if no path */
+    uint8_t k=14;
+    A->asset_read(F_PATH,f+k,F_PATH_LEN); k+=F_PATH_LEN;
+    f[k++]=0x03; f[k++]=0xF0;                                  /* UI frame, no layer 3 */
+    uint8_t sym[2];
+    A->asset_read(F_SYM,sym,2);
+    f[k++]='!';                                                /* position, no messaging */
+    k=(uint8_t)(putCoord(f+k,g.pos,LAT_DIGITS,(g.hemi&1u)?'S':'N')-f);
+    f[k++]=sym[0];                                             /* symbol table */
+    k=(uint8_t)(putCoord(f+k,g.pos+LAT_DIGITS,POS_DIGITS-LAT_DIGITS,(g.hemi&2u)?'W':'E')-f);
+    f[k++]=sym[1];                                             /* symbol code  */
+    A->asset_read(F_COMMENT,f+k,F_COMMENT_LEN); k+=F_COMMENT_LEN;
+    uint16_t c=0xFFFFu;                                        /* CRC-16/X.25 */
+    for(uint8_t i=0;i<k;i++){
+        c^=f[i];
+        for(uint8_t b=0;b<8u;b++) c=(c&1u)?(uint16_t)((c>>1)^0x8408u):(uint16_t)(c>>1);
+    }
+    c^=0xFFFFu;
+    f[k++]=(uint8_t)c; f[k++]=(uint8_t)(c>>8);
+    g.flen=k;
+}
+
+/* ---- SysTick cycle counter (call at least every 10 ms; compare with a signed
+ * difference) ---- */
+static void clkStart(void){ g.tPrev=SYST_VAL; g.tCyc=0; }
+static uint32_t clkCyc(void){
+    uint32_t v=SYST_VAL;
+    g.tCyc += (v<=g.tPrev) ? g.tPrev-v : g.tPrev+(SYST_LOAD+1u-v);
+    g.tPrev=v;
+    return g.tCyc;
+}
+
+/* ---- AFSK ---- */
+static void setTone(void){
+    const app_api_t *A=g.A;
+    uint32_t v=g.lvl;
+    if(g.space){ v=(v*(uint32_t)(8+g.tw))>>3; if(v>LVL_MAX) v=LVL_MAX; }
+    A->bk_write(REG_71,(uint16_t)(g.space?F_SPACE:F_MARK));
+    A->bk_write(REG_70,(uint16_t)(0x8000u|(v<<8)));
+}
+/* one bit on the air: NRZI (a 0 changes the tone), from the next bit edge */
+static void sendBit(uint8_t b){
+    while((int32_t)(clkCyc()-g.next)<0){}
+    if(!b){ g.space^=1u; setTone(); }
+    g.next+=CYC_PER_BIT;
+}
+/* one byte LSB first; inside the frame, a 0 is stuffed after five 1s */
+static void sendByte(uint8_t v,bool stuff){
+    for(uint8_t i=0;i<8u;i++){
+        uint8_t b=(uint8_t)(v&1u);
+        v>>=1;
+        sendBit(b);
+        if(stuff){
+            if(!b) g.ones=0;
+            else if(++g.ones==5u){ sendBit(0); g.ones=0; }
+        }
+    }
+}
+
+/* "LAT  48 50.90 N" on a normal-font line (7 px per character), and a '^' under
+ * the digit at cursor cur (-1: none) */
+static void editRow(const char *label,uint8_t line,const uint8_t *d,uint8_t n,char h,int8_t cur){
+    char *o=put(str,label);
+    uint8_t col=0;
+    for(uint8_t i=0;i<n;i++){
+        if(i==n-4u) *o++=' ';
+        if(i==n-2u) *o++='.';
+        if((int8_t)i==cur) col=(uint8_t)(o-str);
+        *o++=(char)('0'+d[i]);
+    }
+    *o++=' '; *o++=h; *o='\0';
+    g.A->print_normal(str,0,0,line);
+    if(cur>=0){ str[0]='^'; str[1]='\0'; g.A->print_tiny(str,(uint8_t)(col*7u+2u),(uint8_t)(line*8u+9u),false,true); }
+}
+
+/* ---- display ---- */
+static void draw(void){
+    /* The UI texts live in the assets: one read per frame into this word-aligned
+     * stack block (gen_assets.py keeps every offset aligned). */
+    char s[UI_SIZE] __attribute__((aligned(4)));
+    const app_api_t *A=g.A;
+    char *o;
+    A->asset_read(0,s,UI_SIZE);
+    A->display_clear();
+    A->status_clear();
+    A->print_inverse(s+T_TITLE,2,0,true,true,(uint8_t)(2u+T_TITLE_CHARS*4u));
+    if(g.status==ST_TX)                  /* a second capsule while on the air */
+        A->print_inverse(s+T_TX,TX_CAPS_X,0,true,true,(uint8_t)(TX_CAPS_X+T_TX_CHARS*4u));
+    A->draw_battery();
+
+    if(g.edit){
+        int8_t c=(int8_t)g.cur;
+        editRow(s+T_LAT,1,g.ed,LAT_DIGITS,(g.ehemi&1u)?'S':'N',c<(int8_t)LAT_DIGITS?c:-1);
+        editRow(s+T_LON,3,g.ed+LAT_DIGITS,POS_DIGITS-LAT_DIGITS,(g.ehemi&2u)?'W':'E',
+                c>=(int8_t)LAT_DIGITS?(int8_t)(c-(int8_t)LAT_DIGITS):-1);
+        tiny(40,put(str,s+T_HELP1));
+        tiny(48,put(str,g.status==ST_BADPOS?s+T_BADPOS:s+T_HELP2));
+        A->blit_status();
+        A->blit_full();
+        return;
+    }
+
+    if(g.flen){
+        const uint8_t *f=g.frm;
+        o=putCall(str,f+7); *o='\0';
+        A->print_normal(str,0,0,0);              /* source */
+        o=str; *o++='>'; o=putCall(o,f);
+        for(uint8_t e=13; !(f[e]&1u); ){ e+=7; *o++=','; o=putCall(o,f+e-6); }
+        tiny(9,o);                               /* ">APZK5,WIDE1-1" (<= 2 hops) */
+        uint8_t i=(uint8_t)(14u+F_PATH_LEN+2u), end=(uint8_t)(g.flen-2u);   /* info */
+        for(uint8_t row=0;row<2u;row++){         /* info (<= 64), 2 rows of 32 */
+            o=str;
+            for(; o<str+32 && i<end; i++) *o++=(char)f[i];
+            tiny((uint8_t)(17u+row*7u),o);
+        }
+    }
+
+    /* dotted separator above the frequency: y = 30, bit 6 of line 3 (the big
+     * digits start at y = 33) */
+    for(uint8_t x=0;x<128u;x+=2u) A->fb[3][x]|=0x40u;
+    drawFreq(A->tx_freq());
+
+    /* bottom line: "lvl 66  tw +0  sent 3", or why nothing was sent */
+    if(g.status==ST_DENIED||g.status==ST_NOCALL)
+        o=put(str,g.status==ST_DENIED?s+T_DENIED:s+T_NOCALL);
+    else {
+        o=put(str,s+T_LVL); o=puti(o,g.lvl);
+        o=put(o,s+T_TW); if(g.tw>0) *o++='+'; o=puti(o,g.tw);
+        o=put(o,s+T_SENT); o=puti(o,g.sent);
+    }
+    tiny(49,o);
+
+    A->blit_status();
+    A->blit_full();
+}
+
+/* ---- one frame on the air ---- */
+static void send(void){
+    const app_api_t *A=g.A;
+    if(!g.flen){ g.status=ST_NOCALL; return; }
+    if(A->tx_state()){ g.status=ST_DENIED; return; }
+    g.status=ST_TX;
+    draw();
+
+    A->tx_set_params();                  /* carrier + PA on the TX VFO          */
+    A->bk_write(REG_51,0);               /* no CTCSS/DCS under the AFSK         */
+    A->tx_tone(1200);                    /* tone path on, mic off, 50 ms settle */
+    g.space=0;
+    setTone();                           /* mark at our level                   */
+    clkStart();
+    g.next=CYC_PER_BIT;
+    for(uint8_t i=0;i<TXDELAY_FLAGS;i++) sendByte(0x7E,false);
+    g.ones=0;
+    for(uint8_t i=0;i<g.flen;i++) sendByte(g.frm[i],true);
+    for(uint8_t i=0;i<TAIL_FLAGS;i++) sendByte(0x7E,false);
+    while((int32_t)(clkCyc()-g.next)<0){}   /* the last bit plays out           */
+    A->tx_mute(true);
+    A->tx_end();                         /* PA off + RX restored                */
+
+    if(g.sent<9999u) g.sent++;
+    g.status=ST_IDLE;
+}
+
+/* ---- input ---- */
+static void handleKeys(void){
+    const app_api_t *A=g.A;
+    uint8_t key=A->get_key();
+    if(key==APP_KEY_INVALID||key==g.prevKey){ g.prevKey=key; return; }
+    g.prevKey=key;
+    A->backlight_on();
+    if(g.edit){                          /* position editor */
+        g.status=ST_IDLE;
+        if(key<=APP_KEY_9){ g.ed[g.cur]=key; if(g.cur<POS_DIGITS-1u) g.cur++; }
+        else if(key==APP_KEY_STAR) g.ehemi^=(uint8_t)(g.cur<LAT_DIGITS?1u:2u);
+        else if(key==APP_KEY_MENU){
+            if(!posOk(g.ed)){ g.status=ST_BADPOS; return; }
+            memcpy(g.pos,g.ed,POS_DIGITS);
+            g.hemi=g.ehemi;
+            g.edit=false;
+            build();
+            if(!g.flen) g.status=ST_NOCALL;
+        }
+        else if(key==APP_KEY_EXIT) g.edit=false;
+        else {
+            int8_t d=A->nav_dir(key);
+            if(d<0 && g.cur) g.cur--;
+            if(d>0 && g.cur<POS_DIGITS-1u) g.cur++;
+        }
+        return;
+    }
+    if(key==APP_KEY_EXIT) g.running=false;
+    else if(key==APP_KEY_MENU||key==APP_KEY_PTT) send();
+    else if(key==APP_KEY_1){ if(g.tw>TW_MIN) g.tw--; }
+    else if(key==APP_KEY_3){ if(g.tw<TW_MAX) g.tw++; }
+    else if(key==APP_KEY_5){
+        memcpy(g.ed,g.pos,POS_DIGITS);
+        g.ehemi=g.hemi;
+        g.cur=0;
+        g.edit=true;
+        if(g.status!=ST_NOCALL) g.status=ST_IDLE;
+    }
+    else {
+        int8_t d=A->nav_dir(key);
+        if(d>0 && g.lvl<=LVL_MAX-LVL_STEP) g.lvl=(uint8_t)(g.lvl+LVL_STEP);
+        if(d<0 && g.lvl>=LVL_MIN+LVL_STEP) g.lvl=(uint8_t)(g.lvl-LVL_STEP);
+    }
+}
+
+__attribute__((section(".text.entry"),used))
+void app_main(const app_api_t *api){
+    uint8_t frm[FRAME_MAX];      /* on the stack: the 4 KiB overlay also holds .bss */
+    uint8_t c[CFG_LEN];
+    g.A=api;
+    g.frm=frm;
+    g.prevKey=APP_KEY_INVALID;   /* the rest of g starts at 0 (overlay zeroed by the loader) */
+    g.lvl=LVL_DEF;
+    api->asset_read(POS_DEF,g.pos,POS_DIGITS);
+    api->asset_read(POS_DEF+POS_DIGITS,&g.hemi,1);
+    api->cfg_load(c,CFG_LEN);
+    if(c[0]==CFG_MAGIC){
+        if(c[1]>=LVL_MIN && c[1]<=LVL_MAX) g.lvl=c[1];
+        if((int8_t)c[2]>=TW_MIN && (int8_t)c[2]<=TW_MAX) g.tw=(int8_t)c[2];
+        for(uint8_t i=0;i<POS_DIGITS;i++) g.ed[i]=(uint8_t)((c[3+i/2u]>>((i&1u)*4u))&15u);
+        uint8_t h=(uint8_t)(c[9]>>4);
+        if(posOk(g.ed) && h<=3u){ memcpy(g.pos,g.ed,POS_DIGITS); g.hemi=h; }
+    }
+    build();
+    if(!g.flen) g.status=ST_NOCALL;
+    api->backlight_on();
+
+    g.running=true;
+    while(g.running){
+        handleKeys();
+        if(!g.running) break;
+        draw();
+        api->battery_sample();
+        api->delay_ms(40);
+    }
+
+    c[0]=CFG_MAGIC; c[1]=g.lvl; c[2]=(uint8_t)g.tw;
+    for(uint8_t i=3;i<CFG_LEN;i++) c[i]=0;
+    for(uint8_t i=0;i<POS_DIGITS;i++) c[3+i/2u]|=(uint8_t)(g.pos[i]<<((i&1u)*4u));
+    c[9]|=(uint8_t)(g.hemi<<4);          /* the 14th nibble */
+    api->cfg_save(c,CFG_LEN);
+}
diff --git a/App/apps/aprstx/build.sh b/App/apps/aprstx/build.sh
new file mode 100755
index 00000000..13c26f2f
--- /dev/null
+++ b/App/apps/aprstx/build.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# Build one overlay-app blob (.app). Invoked by ../../../compile-app.sh inside
+# the uvk1-uvk5v3 Docker image, run from this app's directory. Everything is
+# derived from the directory name; only APP_NAME - the human label baked into
+# the 64-byte blob header - is per-app. The .app file is named after it (spaces
+# stripped), so "Broadcast FM" -> BroadcastFM.app.
+set -euo pipefail
+
+APP="$(basename "$PWD")"            # breakout, foxhunt, beacon, fm, ...
+APP_NAME="APRS TX"                  # <-- the only per-app line
+APP_VER="0.2"
+APP_API_MIN=2
+APP_VMA=${APP_VMA:-0x20000280}      # pinned overlay VMA (Core/py32f071xb.ld)
+OUT="${APP_NAME// /}"               # blob basename ("Broadcast FM" -> BroadcastFM)
+
+CC=/opt/toolchain/bin/arm-none-eabi-gcc
+OBJCOPY=/opt/toolchain/bin/arm-none-eabi-objcopy
+command -v arm-none-eabi-gcc >/dev/null 2>&1 && { CC=arm-none-eabi-gcc; OBJCOPY=arm-none-eabi-objcopy; }
+
+CFLAGS="-mcpu=cortex-m0plus -mthumb -Os -fno-jump-tables -std=gnu11 -ffreestanding -fno-builtin -fno-common \
+  -fomit-frame-pointer -ffunction-sections -fdata-sections -Wall -Wextra"
+LDFLAGS="-nostdlib -nostartfiles -T app.ld -Wl,--defsym,APP_VMA=${APP_VMA} \
+  -Wl,--gc-sections -Wl,-Map=${APP}.map -Wl,--build-id=none -Wl,--no-warn-rwx-segments"
+
+rm -f ./*.app ./*.elf ./*.bin        # drop stale artifacts so discovery is unambiguous
+
+step() { printf '\r  🔨 %-13s [%d/4] %-8s' "$APP_NAME" "$1" "$2"; }
+trap 'printf "\r  ❌ %-13s build failed            \n" "$APP_NAME"' ERR
+
+step 1 assets  ; APP_VER="$APP_VER" python3 ./gen_assets.py "${APP}_assets.bin" "${APP}_assets.h"
+step 2 compile ; "$CC" $CFLAGS $LDFLAGS "${APP}_app.c" -lgcc -o "${APP}.elf"
+step 3 objcopy ; "$OBJCOPY" -O binary "${APP}.elf" "${APP}.bin"
+step 4 pack    ; python3 ../pack_app.py "${APP}.bin" "${OUT}.app" \
+                   --name "$APP_NAME" --ver "$APP_VER" --api-min "$APP_API_MIN" --vma "${APP_VMA}" \
+                   --shortcut none --assets "${APP}_assets.bin" >/dev/null
+trap - ERR
+
+BYTES=$(wc -c < "${APP}.bin")
+if [ "$BYTES" -gt 4096 ]; then
+  printf '\r  🚨 %-13s OVERFLOWS 4 KiB (%d B)     \n' "$APP_NAME" "$BYTES"; exit 1
+fi
+printf '\r  ✅ %-13s %4d B  (%d%% of 4 KiB)  ->  %s.app   \n' \
+       "$APP_NAME" "$BYTES" "$(( BYTES * 100 / 4096 ))" "$OUT"
diff --git a/App/apps/aprstx/gen_assets.py b/App/apps/aprstx/gen_assets.py
new file mode 100755
index 00000000..92e044c7
--- /dev/null
+++ b/App/apps/aprstx/gen_assets.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+# APRS TX read-only assets: the screen texts and the fixed part of the frame.
+#
+# The UI texts come first, each padded to a multiple of 4 bytes: draw() reads
+# them in one asset_read into a word-aligned stack block, so every text costs a
+# 2-byte sp-relative add instead of a literal-pool load and a pool word.
+# The frame parts are AX.25-encoded here (addresses shifted left, SSID bytes,
+# end-of-address bit on the last path entry): the app adds the source
+# (boot-message callsign + SSID), the position (edited on the radio, this one is
+# the default) and the FCS. Edit the station settings below, then rebuild;
+# test/tx_model.py checks the resulting frame.
+#
+#   ./gen_assets.py aprstx_assets.bin aprstx_assets.h
+import os, re, sys
+sys.dont_write_bytecode = True
+HERE = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.join(HERE, ".."))
+from app_assets import Assets
+
+# ---- station settings ----
+SSID = 7                                   # F4HWN-7
+DEST = "APZK5"                             # APZ = experimental software
+PATH = ["WIDE1-1"]                         # [] for none
+LAT, LON = "4850.90N", "00216.25E"         # default position: DDMM.hhN, DDDMM.hhE
+SYMBOL = "/["                              # table, code: '[' = person
+COMMENT = "UV-K5 APRS TX"
+# info field: "!" + LAT + SYMBOL[0] + LON + SYMBOL[1] + COMMENT
+
+TITLE = "APRS TX"
+TX_CAPS = "TRANSMIT"                       # status-bar capsule while on the air
+
+UI = [
+    ("T_TITLE",  TITLE),
+    ("T_TX",     TX_CAPS),
+    ("T_DENIED", "TX denied"),
+    ("T_NOCALL", "No boot callsign"),
+    ("T_LVL",    "lvl "),
+    ("T_TW",     "  tw "),
+    ("T_SENT",   "  sent "),
+    ("T_LAT",    "LAT  "),              # 2 spaces: digits aligned with LON
+    ("T_LON",    "LON "),
+    ("T_HELP1",  "0-9 digit  * N/S E/W"),
+    ("T_HELP2",  "UP/DN move  MENU ok  EXIT"),
+    ("T_BADPOS", "Invalid position"),
+]
+
+
+def addr(call, last=False):
+    call, _, ssid = call.upper().partition("-")
+    if not (1 <= len(call) <= 6 and call.isalnum()):
+        sys.exit(f"bad AX.25 address {call!r}")
+    b = bytes(ord(c) << 1 for c in call.ljust(6))
+    return b + bytes([0x60 | (int(ssid or 0) << 1) | (1 if last else 0)])
+
+
+if not 0 <= SSID <= 15:
+    sys.exit("SSID must be 0-15")
+if len(PATH) > 2:
+    sys.exit("at most 2 path entries (frame buffer)")
+if not (re.fullmatch(r"\d{4}\.\d{2}[NS]", LAT) and re.fullmatch(r"\d{5}\.\d{2}[EW]", LON)):
+    sys.exit("LAT must be DDMM.hhN/S, LON DDDMM.hhE/W")
+if len(SYMBOL) != 2 or len(COMMENT) > 43:
+    sys.exit("SYMBOL is 2 characters, COMMENT at most 43 (frame buffer)")
+# 13 digits (DDMMhh DDDMMhh), then the hemispheres: bit 0 south, bit 1 west
+POS = [int(c) for c in LAT + LON if c.isdigit()]
+HEMI = (LAT[-1] == "S") | (LON[-1] == "W") << 1
+
+a = Assets("APRSTX")
+ui_size = 0
+for name, s in UI:
+    pad = -(len(s) + 1) % 4                 # keep every offset word-aligned
+    a.text(name, s + "\0" * pad)
+    ui_size += len(s) + 1 + pad
+a.const("UI_SIZE", ui_size)                 # the UI block read by draw()
+a.const("T_TITLE_CHARS", len(TITLE))
+a.const("T_TX_CHARS", len(TX_CAPS))
+a.const("CFG_SSID", SSID)
+a.raw("F_DEST", addr(DEST))
+a.raw("F_PATH", b"".join(addr(h, i == len(PATH) - 1) for i, h in enumerate(PATH)))
+a.u8("POS_DEF", POS + [HEMI])
+a.raw("F_SYM", SYMBOL.encode("ascii"))
+a.raw("F_COMMENT", COMMENT.encode("ascii"))
+a.main()
diff --git a/App/apps/aprstx/test/tx_model.py b/App/apps/aprstx/test/tx_model.py
new file mode 100644
index 00000000..ec5e84a3
--- /dev/null
+++ b/App/apps/aprstx/test/tx_model.py
@@ -0,0 +1,202 @@
+#!/usr/bin/env python3
+"""Model of the APRS TX app: the frame and bit stream of aprstx_app.c rebuilt
+from the real assets (gen_assets.py), checked against the AX.25 reference of
+the RX app (ax25.py), then sent as AFSK and decoded by the APRS RX model
+(model_rx.py) through a receiver audio path.
+
+The tone generator is modelled with a phase-continuous NCO (expected: REG_71 is
+rewritten, not the phase) and, as the worst case, with a phase reset at each
+tone change. The TX tone path is assumed flat (no pre-emphasis): a receiver with
+de-emphasis (STD path, FT3D) then sees 2200 Hz ~5 dB low, which the app's twist
+setting (2200 Hz gain x (8 + tw) / 8) compensates.
+
+  tx_model.py        runs the checks and the decode sweep
+"""
+import math, os, re, subprocess, sys, tempfile
+HERE = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.join(HERE, "..", "..", "aprsrx", "test"))
+from ax25 import build, hdlc_bits, crc16, decode
+import model_rx as M
+
+CALL = "F4HWN"            # boot message
+TXDELAY_FLAGS, TAIL_FLAGS = 40, 3
+LEAD_S = 0.050 + 1 / 1200 # tx_tone's 50 ms settle, then the first bit edge
+DEV_MARK = 3000.0         # Hz of deviation for the mark tone at the chosen level
+
+
+def assets():
+    d = tempfile.mkdtemp()
+    b, h = os.path.join(d, "a.bin"), os.path.join(d, "a.h")
+    subprocess.run([sys.executable, os.path.join(HERE, "..", "gen_assets.py"), b, h], check=True)
+    defs = dict(re.findall(r"#define (\w+) (\d+)u", open(h).read()))
+    return open(b, "rb").read(), {k: int(v) for k, v in defs.items()}
+
+
+def put_coord(d, h):
+    """aprstx_app.c putCoord(): 4850.90N / 00216.25E"""
+    n = len(d)
+    return "".join(("." if i == n - 2 else "") + str(x) for i, x in enumerate(d)) + h
+
+
+def pos_ok(d):
+    """aprstx_app.c posOk()"""
+    if any(x > 9 for x in d): return False
+    la, lam, lo, lom = d[0] * 10 + d[1], d[2] * 10 + d[3], d[6] * 100 + d[7] * 10 + d[8], d[9] * 10 + d[10]
+    if la > 90 or lam > 59 or lo > 180 or lom > 59: return False
+    if la == 90 and (lam | d[4] | d[5]): return False
+    if lo == 180 and (lom | d[11] | d[12]): return False
+    return True
+
+
+def cfg_pack(lvl, tw, pos, hemi):
+    c = [0xA8, lvl, tw & 0xFF] + [0] * 7
+    for i, x in enumerate(pos): c[3 + i // 2] |= x << ((i & 1) * 4)
+    c[9] |= hemi << 4
+    return bytes(c)
+
+
+def cfg_unpack(c):
+    pos = [(c[3 + i // 2] >> ((i & 1) * 4)) & 15 for i in range(13)]
+    return pos, c[9] >> 4
+
+
+def edit_row(label, d, h, cur):
+    """aprstx_app.c editRow(): the text and the caret column"""
+    o, col, n = label, None, len(d)
+    for i, x in enumerate(d):
+        if i == n - 4: o += " "
+        if i == n - 2: o += "."
+        if i == cur: col = len(o)
+        o += str(x)
+    return o + " " + h, col
+
+
+def build_c(blob, D, call=CALL, pos=None, hemi=None):
+    """aprstx_app.c build()"""
+    if not call or len(call) > 6 or "/" in call:
+        return None
+    rd = lambda name: blob[D[name]:D[name] + D[name + "_LEN"]]
+    pd = rd("POS_DEF")
+    pos = list(pd[:13]) if pos is None else pos
+    hemi = pd[13] if hemi is None else hemi
+    sym = rd("F_SYM").decode()
+    info = "!" + put_coord(pos[:6], "S" if hemi & 1 else "N") + sym[0] + \
+        put_coord(pos[6:], "W" if hemi & 2 else "E") + sym[1] + rd("F_COMMENT").decode()
+    f = bytearray(rd("F_DEST"))
+    f += bytes(ord(call[i]) << 1 if i < len(call) else 0x40 for i in range(6))
+    f.append(0x60 | (D["CFG_SSID"] << 1) | (0 if D["F_PATH_LEN"] else 1))
+    f += rd("F_PATH") + b"\x03\xF0" + info.encode()
+    c = 0xFFFF
+    for x in f:
+        c ^= x
+        for _ in range(8):
+            c = (c >> 1) ^ 0x8408 if c & 1 else c >> 1
+    c ^= 0xFFFF
+    return bytes(f + bytes([c & 0xFF, c >> 8]))
+
+
+def bits_c(frame):
+    """aprstx_app.c sendByte()/sendBit(): the bits on the air, before NRZI"""
+    out, ones = [], 0
+    def byte(v, stuff):
+        nonlocal ones
+        for _ in range(8):
+            b = v & 1; v >>= 1
+            out.append(b)
+            if stuff:
+                if not b: ones = 0
+                else:
+                    ones += 1
+                    if ones == 5: out.append(0); ones = 0
+    for _ in range(TXDELAY_FLAGS): byte(0x7E, False)
+    ones = 0
+    for x in frame: byte(x, True)
+    for _ in range(TAIL_FLAGS): byte(0x7E, False)
+    return out
+
+
+def afsk(bits, tw=0, reset=False, twist_path_db=0.0):
+    """discriminator output (Hz) of the transmitted AFSK; tw as in the app,
+    twist_path_db an extra 2200 Hz gain of the TX audio path (unknown)"""
+    fs = M.FS_SIM
+    a_sp = DEV_MARK * min(127, 66 * (8 + tw) // 8) / 66 * 10 ** (twist_path_db / 20)
+    out, ph, space = [], 0.0, False
+    for i in range(int(LEAD_S * fs)):                  # plain mark before the flags
+        ph += 1200 / fs
+        out.append(DEV_MARK * math.sin(2 * math.pi * ph))
+    spb = fs / 1200
+    t = 0.0
+    for b in bits:
+        if not b:
+            space = not space
+            if reset: ph = 0.0
+        f, a = (2200, a_sp) if space else (1200, DEV_MARK)
+        t += spb
+        while len(out) < int(LEAD_S * fs + t):
+            ph += f / fs
+            out.append(a * math.sin(2 * math.pi * ph))
+    return out
+
+
+def main():
+    blob, D = assets()
+    ok = True
+    f = build_c(blob, D)
+    ssid = D["CFG_SSID"]
+    info = "!4850.90N/00216.25E[UV-K5 APRS TX"          # gen_assets.py defaults
+    ref = build("%s-%d" % (CALL, ssid) if ssid else CALL, dst="APZK5", path=["WIDE1-1"], info=info)
+    print("frame  ", decode(f), "(%d bytes)" % len(f))
+    ok &= f == ref
+    print("frame == ax25.build:", f == ref)
+    bc = bits_c(f)
+    ok &= bc == hdlc_bits(f, TXDELAY_FLAGS, TAIL_FLAGS)
+    print("bits  == ax25.hdlc_bits:", bc == hdlc_bits(f, TXDELAY_FLAGS, TAIL_FLAGS),
+          "(%d bits, %.0f ms + %.0f ms lead)" % (len(bc), len(bc) / 1.2, LEAD_S * 1000))
+    for bad in ("", "F4HWN/P", "F4HWN73"):
+        ok &= build_c(blob, D, bad) is None
+    print("bad boot callsigns refused:", True)
+
+    # position editor: another position, south/west, the frame and the config
+    pos = [3, 3, 5, 2, 1, 3, 1, 5, 1, 1, 2, 5, 6]           # 33 52.13S 151 12.56W
+    f2 = build_c(blob, D, pos=pos, hemi=3)
+    want = build("F4HWN-7", dst="APZK5", path=["WIDE1-1"],
+                 info="!3352.13S/15112.56W[UV-K5 APRS TX")
+    ok &= f2 == want
+    print("edited position frame:", f2 == want, decode(f2))
+    c = cfg_pack(70, -2, pos, 3)
+    ok &= len(c) == 10 and cfg_unpack(c) == (pos, 3)
+    print("config round trip:", cfg_unpack(c) == (pos, 3), c.hex())
+    rows = (edit_row("LAT  ", pos[:6], "S", 2), edit_row("LON ", pos[6:], "W", -1))
+    ok &= rows == (("LAT  33 52.13 S", 8), ("LON 151 12.56 W", None))
+    print("editor rows:", rows)
+    checks = [([4,8,5,0,9,0,0,0,2,1,6,2,5], True), ([9,0,0,0,0,0,1,8,0,0,0,0,0], True),
+              ([9,0,0,1,0,0,0,0,0,0,0,0,0], False), ([4,8,6,0,0,0,0,0,0,0,0,0,0], False),
+              ([4,8,0,0,0,0,1,8,0,0,0,0,1], False), ([4,8,0,0,0,0,1,8,1,0,0,0,0], False),
+              ([4,8,0,0,0,0,0,0,0,6,0,0,0], False)]
+    good = all(pos_ok(d) == w for d, w in checks)
+    ok &= good
+    print("posOk limits:", good)
+
+    print("\n%-6s %-5s %4s %6s %5s | frames (3 seeds)" % ("phase", "rx", "tw", "path", "noise"))
+    for reset in (False, True):
+        for mode in ("raw", "std"):
+            for tw, path_db in ((0, 0.0), (4, 0.0), (0, 5.0)):
+                for noise in (0, 1500):
+                    w = afsk(bc, tw, reset, path_db)
+                    n = 0
+                    for seed in (1, 2, 3):
+                        adc = M.channel(w, mode, noise, 0, 0, seed)
+                        d = M.Demod()
+                        for s in adc:
+                            d.sample(s)
+                        n += d.frames == [f]
+                    print("%-6s %-5s %4d %+5.0fdB %5d | %d/3" % (
+                        "reset" if reset else "cont", mode, tw, path_db, noise, n))
+                    if not reset and noise == 0:
+                        ok &= n == 3
+    print("\nALL OK" if ok else "\nFAILURES")
+    return 0 if ok else 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/cmake/check_printf_formats.py b/cmake/check_printf_formats.py
index d1c510f2..d4eb5267 100644
--- a/cmake/check_printf_formats.py
+++ b/cmake/check_printf_formats.py
@@ -278,7 +278,9 @@ def main() -> int:
         *args.source_root.rglob("*.h"),
     )
     for path in sorted(source_files):
-        if "external" in path.parts:
+        # external code, and host-side test programs (App/apps/*/test) that use
+        # the host printf and are never built into the firmware
+        if "external" in path.parts or "test" in path.parts:
             continue
         errors.extend(validate_file(path, debug_defined))