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uv-k1-k5v3-firmware-custom/App/apps/app_api.h
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/* 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.
*/
/*
* Overlay-app ABI (POC).
*
* A leaf, modal "overlay app" is a self-contained code blob stored in the
* external SPI flash and copied into the 4 KiB overlay RAM (the PY25Q16 sector
* cache) to run, then discarded. It is linked with NOCROSSREFS and must not
* reference resident firmware symbols: every service it needs is reached through
* this table, which the loader fills and passes to the entry point.
*
* void app_main(const app_api_t *api); // entry, at blob offset 0
*
* Both the firmware loader and the app include THIS header, so the struct layout
* can never disagree. Bump APP_ABI_VERSION on any incompatible change; the loader
* refuses a blob whose header abi_version does not match.
*/
#ifndef APPS_APP_API_H
#define APPS_APP_API_H
#include <stdint.h>
#include <stdbool.h>
/* The table below is a single versioned layout. Any change to app_api_t - a
* reorder, a removal, or an append - MUST bump this. Keep in sync with the
* value read by pack_app.py, which
* stamps the blob the loader checks against. */
#define APP_ABI_VERSION 5u
/* KEY codes mirrored from driver/keyboard.h (enum KEY_Code_e). Kept in sync by
* value so the app stays independent of the firmware headers. */
enum {
APP_KEY_0 = 0,
APP_KEY_1 = 1,
APP_KEY_2 = 2,
APP_KEY_3 = 3,
APP_KEY_4 = 4,
APP_KEY_5 = 5,
APP_KEY_6 = 6,
APP_KEY_7 = 7,
APP_KEY_8 = 8,
APP_KEY_9 = 9,
APP_KEY_MENU = 10,
APP_KEY_UP = 11,
APP_KEY_DOWN = 12,
APP_KEY_EXIT = 13,
APP_KEY_STAR = 14,
APP_KEY_F = 15,
APP_KEY_PTT = 16,
APP_KEY_INVALID = 19,
};
/* The framebuffer is the resident gFrameBuffer[FRAME_LINES][128]; the app draws
* into it and calls a blit_* to push it to the LCD. */
typedef uint8_t (*app_fb_t)[128];
/* Broadcast FM shared state (mirrors gEeprom.FM_*), read/written via fm_state. */
#define APP_FM_CH_MAX 48
typedef struct {
uint16_t freq_playing; /* current tuned frequency (0.1 MHz) */
uint16_t sel_freq; /* last VFO frequency */
uint8_t band; /* 0..3 */
uint8_t is_mr; /* memory mode */
uint8_t sel_ch; /* selected memory channel 0..47 */
} app_fm_state_t;
/* Compact, pointer-free description of one receiver in the resident triple-VFO
* service. Overlay apps must never see VFO_Info_t directly: its layout varies
* with firmware features and contains resident pointers. */
typedef struct {
uint32_t frequency; /* RX frequency, x10 Hz */
uint16_t channel; /* memory channel, zero based */
uint16_t step; /* step, 10 Hz units */
uint16_t code_value; /* CTCSS x0.1 Hz or DCS octal source value */
int16_t rssi_dbm; /* last/current corrected RSSI */
uint8_t modulation;
uint8_t power;
uint8_t bandwidth;
uint8_t code_type;
uint8_t code;
uint8_t offset_direction;
uint8_t reverse;
uint8_t squelch;
uint8_t flags; /* APP_TRIVFO_* below */
char name[11]; /* channel name, trimmed and NUL terminated */
} app_trivfo_info_t;
enum {
APP_TRIVFO_SELECTED = 1u << 0,
APP_TRIVFO_TUNED = 1u << 1,
APP_TRIVFO_RECEIVING = 1u << 2,
APP_TRIVFO_TX = 1u << 3,
APP_TRIVFO_USER_POWER = 1u << 4,
APP_TRIVFO_AUDIO_BAR = 1u << 5,
};
enum {
APP_TRIVFO_SCAN = 0,
APP_TRIVFO_RX = 1,
APP_TRIVFO_HOLD = 2,
APP_TRIVFO_TX_STATE = 3,
};
typedef struct app_api {
uint8_t abi_version; /* == APP_ABI_VERSION */
app_fb_t fb; /* -> gFrameBuffer */
/* ---- display ---- */
void (*display_clear)(void); /* UI_DisplayClear */
void (*status_clear)(void); /* UI_StatusClear */
void (*draw_line)(app_fb_t fb, int16_t x1, int16_t y1,
int16_t x2, int16_t y2, bool black); /* UI_DrawLineBuffer */
void (*draw_rect)(app_fb_t fb, int16_t x1, int16_t y1,
int16_t x2, int16_t y2, bool black); /* UI_DrawRectangleBuffer */
void (*print_bold)(const char *s, uint8_t start,
uint8_t end, uint8_t line); /* UI_PrintStringSmallBold */
void (*print_tiny)(const char *s, uint8_t x, uint8_t y,
bool statusbar, bool fill); /* GUI_DisplaySmallest */
void (*blit_full)(void); /* ST7565_BlitFullScreen */
void (*blit_line)(unsigned line); /* ST7565_BlitLine */
void (*blit_status)(void); /* ST7565_BlitStatusLine */
/* ---- input / system ---- */
uint8_t (*get_key)(void); /* KEYBOARD_GetKey, returns an APP_KEY_* code */
void (*delay_ms)(uint32_t ms); /* SYSTEM_DelayMs */
/* ---- audio / indicator ---- */
void (*play_tone)(uint16_t tone, uint16_t ms); /* full BK4819 tone burst + AF path */
void (*led)(bool on); /* green GPIO indicator */
/* ==== appended when the ABI moved 1 -> 2; now an integral part of ABI 2.
* A firmware and an app that agree on abi_version agree on this whole layout,
* so these must never be reached through a table that does not include them. == */
/* ---- extra text drawing ---- */
void (*print_normal)(const char *s, uint8_t start, uint8_t end, uint8_t line); /* UI_PrintStringSmallNormal */
void (*print_inverse)(const char *s, uint8_t x, uint8_t line,
bool statusbar, bool fill, uint8_t endX); /* GUI_DisplaySmallestInverse */
void (*display_freq)(const char *s, uint8_t x, uint8_t y, bool statusbar); /* UI_DisplayFrequency (big font) */
/* ---- BK4819 radio access ---- */
int16_t (*rssi_dbm)(void); /* corrected RSSI of the RX VFO, dBm */
uint16_t (*bk_read)(uint8_t reg); /* BK4819_ReadRegister */
void (*bk_write)(uint8_t reg, uint16_t v);/* BK4819_WriteRegister */
void (*set_agc)(bool on); /* BK4819_SetAGC */
void (*set_af)(uint8_t mode); /* BK4819_SetAF (APP_AF_* below) */
void (*audio_path)(bool on); /* AUDIO_AudioPathOn/Off */
void (*prepare_tone)(void); /* BK4819_PrepareToPlayTone(true) */
void (*play_tone_raw)(uint16_t hz, uint16_t ms); /* BK4819_PlayToneRaw */
void (*tones_off_rx)(void); /* BK4819_TurnsOffTones_TurnsOnRX */
uint32_t (*rx_freq)(void); /* current RX VFO frequency (x10 Hz) */
/* ---- config persistence (deferred: staged now, committed on exit) ---- */
void (*cfg_load)(uint8_t *buf, uint8_t len); /* read the app's saved config bytes */
void (*cfg_save)(const uint8_t *buf, uint8_t len); /* stage bytes; resident commits after the app returns */
/* ---- battery + backlight ---- */
void (*draw_battery)(void); /* UI_DrawStatusBattery into the status line */
void (*battery_sample)(void); /* periodic ADC sample so the level stays live */
void (*backlight_on)(void); /* BACKLIGHT_TurnOn */
void (*backlight_update)(void); /* BACKLIGHT_Update (fade step) */
uint8_t *status_line; /* -> gStatusLine (for status-bar icons) */
/* ---- TX (beacon) ---- */
uint8_t (*tx_state)(void); /* 0 = OK to transmit, else a denial code */
void (*tx_set_params)(void); /* RADIO_SetTxParameters (key up: carrier+PA) */
void (*tx_tone)(uint16_t hz);/* BK4819_TransmitTone prime (MCW tone) */
void (*tx_mute)(bool on); /* key the tone on(false)/off(true) via TxMute */
void (*tx_end)(void); /* PA off + RADIO_SetupRegisters (back to RX) */
uint32_t (*tx_freq)(void); /* current TX VFO frequency (x10 Hz) */
void (*boot_callsign)(char *buf, uint8_t len); /* sanitised callsign from the boot message */
void (*print_string)(const char *s, uint8_t start, uint8_t end,
uint8_t line, uint8_t width); /* UI_PrintString (big font) */
/* ---- broadcast FM (BK1080), sovereign: no BK4819 dual-watch ---- */
void (*fm_enter)(uint16_t freq, uint8_t band); /* BK1080_Init + antenna filter + audio on */
void (*fm_exit)(void); /* audio off + BK1080_Init0 + restore filter */
void (*fm_set_freq)(uint16_t freq, uint8_t band);/* BK1080_SetFrequency (freq in 0.1 MHz) */
uint16_t (*fm_lo)(uint8_t band); /* band low limit (0.1 MHz) */
uint16_t (*fm_hi)(uint8_t band); /* band high limit (0.1 MHz) */
void (*fm_mute)(bool mute); /* BK1080_Mute */
int8_t (*fm_valid)(uint16_t freq, uint16_t lo); /* FM_CheckFrequencyLock: 0 = station */
uint16_t *fm_channels; /* -> gFM_Channels[APP_FM_CH_MAX], shared RAM r/w */
void (*fm_state)(app_fm_state_t *s, bool write);/* read/write the resident gEeprom.FM_* */
void (*fm_commit)(void); /* deferred SETTINGS_SaveFM (config + channels) */
/* ---- navigation (ABI 3) ----
* Convert a raw APP_KEY_UP/DOWN into a semantic value direction:
* UV-K5 UP/DOWN -> +1/-1
* UV-K1 LEFT/RIGHT -> -1/+1
* Returns 0 for any other key. Keep get_key() raw for spatial controls. */
int8_t (*nav_dir)(uint8_t key);
/* ---- triple VFO (ABI 4) ----
* A and B are the live Main Display VFOs. C is a resident temporary VFO
* loaded from c_channel (or the first valid memory after B when invalid).
* tick is called every 20 ms by the app and returns APP_TRIVFO_* state. */
uint16_t (*trivfo_enter)(uint16_t c_channel);
void (*trivfo_leave)(void);
void (*trivfo_get)(uint8_t vfo, app_trivfo_info_t *info);
void (*trivfo_select)(uint8_t vfo);
uint16_t (*trivfo_step)(uint8_t vfo, int8_t direction);
uint8_t (*trivfo_tick)(void);
uint8_t (*trivfo_ptt)(bool pressed); /* 0 OK; non-zero TX denial/timeout */
} app_api_t;
/* BK4819 AF modes for set_af (mirror driver/bk4819.h values). */
enum { APP_AF_MUTE = 0, APP_AF_FM = 1, APP_AF_AM = 7 };
/* Register ids the apps use (mirror driver/bk4819-regs.h). */
enum { APP_BK_REG_13 = 0x13 };
/* Entry point every app blob exports, placed at blob offset 0. */
typedef void (*app_entry_t)(const app_api_t *api);
#endif /* APPS_APP_API_H */
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