Add scan RSSI sparkline indicator

App/CMakeLists.txt

@@ -197,6 +197,7 @@ enable_feature(ENABLE_FEAT_F4HWN_INV)
 enable_feature(ENABLE_FEAT_F4HWN_CTR)
 enable_feature(ENABLE_FEAT_F4HWN_SCAN_PROGRESS)
 enable_feature(ENABLE_FEAT_F4HWN_SCAN_FASTER)
+enable_feature(ENABLE_FEAT_F4HWN_SCAN_RSSI)
 enable_feature(ENABLE_FEAT_F4HWN_RESCUE_OPS)
 enable_feature(ENABLE_FEAT_F4HWN_VOL)
 enable_feature(ENABLE_FEAT_F4HWN_AUDIO)

App/app/chFrScanner.c

@@ -1,5 +1,6 @@
 
 #include <stddef.h>
+#include <string.h>
 
 #include "app/app.h"
 #include "app/chFrScanner.h"
@@ -232,6 +233,65 @@ static uint32_t scanFastPrevFrequency;
 static bool     scanFastLastFullTuneCandidate;
 static VFO_Info_t scanFastDisplayVfo;
 static bool       scanFastDisplayVfoValid;
+#ifdef ENABLE_FEAT_F4HWN_SCAN_RSSI
+static uint16_t scanRssiSparkline[CHFRSCANNER_RSSI_SPARKLINE_WIDTH];
+static uint8_t  scanRssiSparklineWrite;
+static uint8_t  scanRssiSparklineCount;
+
+static void ScanRssiSparklineReset(void)
+{
+    memset(scanRssiSparkline, 0, sizeof(scanRssiSparkline));
+    scanRssiSparklineWrite = 0;
+    scanRssiSparklineCount = 0;
+}
+
+static void ScanRssiSparklinePush(uint16_t rssi)
+{
+    scanRssiSparkline[scanRssiSparklineWrite] = rssi;
+    scanRssiSparklineWrite++;
+    if (scanRssiSparklineWrite >= CHFRSCANNER_RSSI_SPARKLINE_WIDTH)
+        scanRssiSparklineWrite = 0;
+
+    if (scanRssiSparklineCount < CHFRSCANNER_RSSI_SPARKLINE_WIDTH)
+        scanRssiSparklineCount++;
+}
+
+bool CHFRSCANNER_HasScanRssiSparkline(void)
+{
+    return gScanStateDir != SCAN_OFF && scanRssiSparklineCount > 1;
+}
+
+uint8_t CHFRSCANNER_GetScanRssiSparklineLevel(uint8_t index)
+{
+    uint16_t minRssi = SCAN_FAST_RSSI_MAX;
+    uint16_t rssi = 0;
+    uint8_t oldest;
+
+    if (index >= CHFRSCANNER_RSSI_SPARKLINE_WIDTH || scanRssiSparklineCount == 0)
+        return 0;
+
+    if (index < CHFRSCANNER_RSSI_SPARKLINE_WIDTH - scanRssiSparklineCount)
+        return 0;
+
+    oldest = (uint8_t)((scanRssiSparklineWrite + CHFRSCANNER_RSSI_SPARKLINE_WIDTH - scanRssiSparklineCount)
+                       % CHFRSCANNER_RSSI_SPARKLINE_WIDTH);
+    index -= (uint8_t)(CHFRSCANNER_RSSI_SPARKLINE_WIDTH - scanRssiSparklineCount);
+
+    for (uint8_t i = 0; i < scanRssiSparklineCount; i++)
+    {
+        const uint16_t sample = scanRssiSparkline[(oldest + i) % CHFRSCANNER_RSSI_SPARKLINE_WIDTH];
+        if (sample != 0 && sample < minRssi)
+            minRssi = sample;
+    }
+
+    rssi = scanRssiSparkline[(oldest + index) % CHFRSCANNER_RSSI_SPARKLINE_WIDTH];
+    if (rssi == 0 || minRssi == SCAN_FAST_RSSI_MAX || rssi <= minRssi + 2)
+        return 0;
+
+    // 48 RSSI units ~= 24 dB. This keeps quiet jitter low while strong hits pop.
+    return (uint8_t)MIN(((uint32_t)(rssi - minRssi) * 5u + 24u) / 48u, 5u);
+}
+#endif
 
 static void ScanFastResetState(void)
 {
@@ -538,6 +598,9 @@ static scan_fast_result_t ScanRangeFastPrecheck(void)
         ScanFastTune(freq);
 
         const uint16_t rssi = ScanFastReadCandidateRssi();
+#ifdef ENABLE_FEAT_F4HWN_SCAN_RSSI
+        ScanRssiSparklinePush(rssi);
+#endif
         if (ScanFastIsCandidate(rssi))
         {
             ScanRangeFastRefineCandidate(rssi);
@@ -573,7 +636,12 @@ static bool MemChannelFastPrecheck(uint16_t channel)
     scanFastReg30 = BK4819_ReadRegister(BK4819_REG_30) & ~BK4819_REG_30_MASK_ENABLE_AF_DAC;
     ScanFastTune(frequency);
 
-    if (ScanFastIsCandidate(ScanFastReadCandidateRssi()))
+    const uint16_t rssi = ScanFastReadCandidateRssi();
+#ifdef ENABLE_FEAT_F4HWN_SCAN_RSSI
+    ScanRssiSparklinePush(rssi);
+#endif
+
+    if (ScanFastIsCandidate(rssi))
     {
         scanFastLastFullTuneCandidate = true;
         return true;  // signal detected: let the full tune path follow
@@ -637,6 +705,9 @@ void CHFRSCANNER_Start(const bool storeBackupSettings, const int8_t scan_directi
     currentScanList = SCAN_NEXT_CHAN_SCANLIST1;
     gScanStateDir    = scan_direction;
 #ifdef ENABLE_FEAT_F4HWN_SCAN_FASTER
+#ifdef ENABLE_FEAT_F4HWN_SCAN_RSSI
+    ScanRssiSparklineReset();
+#endif
     ScanFastResetState();
 #endif
 
@@ -820,6 +891,9 @@ void CHFRSCANNER_Stop(void)
     }
     
     gScanStateDir = SCAN_OFF;
+#if defined(ENABLE_FEAT_F4HWN_SCAN_FASTER) && defined(ENABLE_FEAT_F4HWN_SCAN_RSSI)
+    ScanRssiSparklineReset();
+#endif
 
     const uint32_t chFr = gScanKeepResult ? lastFoundFrqOrChan : initialFrqOrChan;
     const bool channelChanged = chFr != initialFrqOrChan;

App/app/chFrScanner.h

@@ -26,6 +26,11 @@ void CHFRSCANNER_ManualResume(const int8_t scan_direction);
 void CHFRSCANNER_ContinueScanning(void);
 #ifdef ENABLE_FEAT_F4HWN_SCAN_FASTER
 const VFO_Info_t *CHFRSCANNER_GetScanDisplayVfo(void);
+#ifdef ENABLE_FEAT_F4HWN_SCAN_RSSI
+bool CHFRSCANNER_HasScanRssiSparkline(void);
+uint8_t CHFRSCANNER_GetScanRssiSparklineLevel(uint8_t index);
+#define CHFRSCANNER_RSSI_SPARKLINE_WIDTH 24u
+#endif
 #endif
 
 #if defined(ENABLE_FEAT_F4HWN_RESUME_STATE) || defined(ENABLE_SCAN_RANGES)

App/ui/main.c

@@ -140,6 +140,71 @@ const char *VfoStateStr[] = {
        [VFO_STATE_VOLTAGE_HIGH]="VOLT HIGH"
 };
 
+#if defined(ENABLE_FEAT_F4HWN_SCAN_FASTER) && defined(ENABLE_FEAT_F4HWN_SCAN_RSSI)
+static uint8_t UI_MAIN_GetScanRssiSparklineMask(uint8_t previousLevel, uint8_t level)
+{
+    uint8_t mask = 0;
+    const uint8_t bottom = 5;
+
+    if (level == 0)
+        return (uint8_t)(1u << bottom);
+
+    const uint8_t top = bottom + 1 - level;
+    uint8_t bridgeTop = top;
+    uint8_t bridgeBottom = top;
+
+    if (previousLevel > 0)
+    {
+        const uint8_t previousTop = bottom + 1 - previousLevel;
+        if (previousTop < bridgeTop)
+            bridgeTop = previousTop;
+        else if (previousTop > bridgeBottom)
+            bridgeBottom = previousTop;
+    }
+
+    // Solid crest line with a small vertical bridge to avoid broken diagonals.
+    for (uint8_t y = bridgeTop; y <= bridgeBottom; y++)
+        mask |= (uint8_t)(1u << y);
+
+    return mask;
+}
+
+static void UI_MAIN_DrawScanRssiSparkline(uint8_t line)
+{
+    uint8_t *p_line = gFrameBuffer[line];
+    const uint8_t x0 = 7;
+    uint8_t level[CHFRSCANNER_RSSI_SPARKLINE_WIDTH];
+
+    if (!CHFRSCANNER_HasScanRssiSparkline())
+        return;
+
+    for (uint8_t i = 0; i < CHFRSCANNER_RSSI_SPARKLINE_WIDTH; i++)
+        level[i] = CHFRSCANNER_GetScanRssiSparklineLevel(i);
+
+    for (uint8_t i = 0; i < CHFRSCANNER_RSSI_SPARKLINE_WIDTH; i++)
+    {
+        const uint8_t previousRaw = (i > 0) ? level[i - 1] : 0;
+        const uint8_t nextRaw = (i + 1 < CHFRSCANNER_RSSI_SPARKLINE_WIDTH) ? level[i + 1] : 0;
+        uint8_t displayLevel = (uint8_t)((previousRaw + 2u * level[i] + nextRaw + 2u) >> 2);
+        uint8_t previousLevel = previousRaw;
+
+        if (level[i] == 0 && previousRaw == 0 && nextRaw == 0)
+            displayLevel = 0;
+        else if (displayLevel == 0)
+            displayLevel = 1;
+
+        if (i > 0)
+        {
+            const uint8_t previousPreviousRaw = (i > 1) ? level[i - 2] : 0;
+            previousLevel = (uint8_t)((previousPreviousRaw + 2u * previousRaw + level[i] + 2u) >> 2);
+        }
+
+        const uint8_t mask = UI_MAIN_GetScanRssiSparklineMask(previousLevel, displayLevel);
+        p_line[x0 + i] = (p_line[x0 + i] & 0x80) | mask;
+    }
+}
+#endif
+
 #ifdef ENABLE_FEAT_F4HWN_SCAN_PROGRESS
 static void ScanProgress_ResetSession(void)
 {
@@ -1442,6 +1507,11 @@ void UI_DisplayMain(void)
 #endif
         }
 
+#if defined(ENABLE_FEAT_F4HWN_SCAN_FASTER) && defined(ENABLE_FEAT_F4HWN_SCAN_RSSI)
+        if (vfo_num == gEeprom.RX_VFO && gScanStateDir != SCAN_OFF && !FUNCTION_IsRx())
+            UI_MAIN_DrawScanRssiSparkline(line);
+#endif
+
         if(TX_freq_check(frequency) != 0 && gEeprom.VfoInfo[vfo_num].TX_LOCK == true)
         {
             if (!FUNCTION_IsRx() || RxOnVfofrequency != frequency)

CMakePresets.json

@@ -70,6 +70,7 @@
                 "ENABLE_FEAT_F4HWN_MEM": false,
                 "ENABLE_FEAT_F4HWN_SCAN_PROGRESS": false,
                 "ENABLE_FEAT_F4HWN_SCAN_FASTER": false,
+                "ENABLE_FEAT_F4HWN_SCAN_RSSI": false,
                 "ENABLE_FEAT_F4HWN_BEAM": false,
                 "ENABLE_FEAT_F4HWN_LOGO": false,
                 "ENABLE_FEAT_F4HWN_LOGO_SAV": false,
@@ -199,6 +200,7 @@
                 "ENABLE_FEAT_F4HWN_AUDIO_SCOPE": true,
                 "ENABLE_FEAT_F4HWN_SCAN_PROGRESS": true,
                 "ENABLE_FEAT_F4HWN_SCAN_FASTER": true,
+                "ENABLE_FEAT_F4HWN_SCAN_RSSI": true,
                 "ENABLE_FEAT_F4HWN_BEAM": true,
                 "ENABLE_FEAT_F4HWN_QRCODE": true,
                 "ENABLE_FEAT_F4HWN_MEM": true,