Add subaudible detection for scan ranges

App/CMakeLists.txt

@@ -198,6 +198,7 @@ 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_SCAN_SUBAUDIBLE)
 enable_feature(ENABLE_FEAT_F4HWN_RESCUE_OPS)
 enable_feature(ENABLE_FEAT_F4HWN_VOL)
 enable_feature(ENABLE_FEAT_F4HWN_AUDIO)

App/app/app.c

@@ -1755,6 +1755,10 @@ void APP_TimeSlice10ms(void)
 
     SCANNER_TimeSlice10ms();
 
+#if defined(ENABLE_SCAN_RANGES) && defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+    CHFRSCANNER_UpdateCssDetection();
+#endif
+
 #ifdef ENABLE_AIRCOPY
     if (gScreenToDisplay == DISPLAY_AIRCOPY && gAircopyState == AIRCOPY_TRANSFER && gAirCopyIsSendMode == 1) {
         if (!AIRCOPY_SendMessage()) {

App/app/chFrScanner.c

@@ -22,6 +22,13 @@ bool              gScanPauseMode;
 uint32_t          gScanRangeStart;
 uint32_t          gScanRangeStop;
 
+#if defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+DCS_CodeType_t    gScanRangeCssType  = CODE_TYPE_OFF;
+uint8_t           gScanRangeCssCode  = 0xFF;
+static uint8_t    scanRangeCssCandidate = 0xFF;
+static uint8_t    scanRangeCssHitCount  = 0;
+#endif
+
 #define SCAN_RANGE_SKIP_MAX 32
 #if (SCAN_RANGE_SKIP_MAX & (SCAN_RANGE_SKIP_MAX - 1)) != 0
     #error SCAN_RANGE_SKIP_MAX must be a power of two
@@ -183,6 +190,58 @@ bool CHFRSCANNER_HasScanRangeExcludedOrdinal(uint32_t first_ordinal, uint32_t la
 
     return false;
 }
+
+#if defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+void CHFRSCANNER_UpdateCssDetection(void)
+{
+    if (!gScanRangeStart || !FUNCTION_IsRx())
+    {
+        gScanRangeCssType    = CODE_TYPE_OFF;
+        gScanRangeCssCode    = 0xFF;
+        scanRangeCssCandidate = 0xFF;
+        scanRangeCssHitCount  = 0;
+        return;
+    }
+
+    uint32_t cdcssFreq;
+    uint16_t ctcssFreq;
+    const BK4819_CssScanResult_t result = BK4819_GetCxCSSScanResult(&cdcssFreq, &ctcssFreq);
+
+    if (result == BK4819_CSS_RESULT_CDCSS)
+    {
+        const uint8_t Code = DCS_GetCdcssCode(cdcssFreq);
+        if (Code != 0xFF && Code != gScanRangeCssCode)
+        {
+            gScanRangeCssType    = CODE_TYPE_DIGITAL;
+            gScanRangeCssCode    = Code;
+            scanRangeCssCandidate = 0xFF;
+            scanRangeCssHitCount  = 0;
+            gUpdateDisplay = true;
+        }
+    }
+    else if (result == BK4819_CSS_RESULT_CTCSS)
+    {
+        const uint8_t Code = DCS_GetCtcssCode(ctcssFreq);
+        if (Code != 0xFF)
+        {
+            if (Code == scanRangeCssCandidate)
+            {
+                if (++scanRangeCssHitCount >= 2 && Code != gScanRangeCssCode)
+                {
+                    gScanRangeCssType = CODE_TYPE_CONTINUOUS_TONE;
+                    gScanRangeCssCode = Code;
+                    gUpdateDisplay    = true;
+                }
+            }
+            else
+            {
+                scanRangeCssCandidate = Code;
+                scanRangeCssHitCount  = 1;
+            }
+        }
+    }
+}
+#endif
 #endif
 
 static void CHFRSCANNER_AbortActiveReception(void)

App/app/chFrScanner.h

@@ -15,8 +15,16 @@ extern bool              gScanPauseMode;
 #ifdef ENABLE_SCAN_RANGES
 extern uint32_t          gScanRangeStart;
 extern uint32_t          gScanRangeStop;
+#if defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+extern DCS_CodeType_t    gScanRangeCssType;
+extern uint8_t           gScanRangeCssCode;
+#endif
+
 bool CHFRSCANNER_ExcludeCurrentScanRange(void);
 bool CHFRSCANNER_HasScanRangeExcludedOrdinal(uint32_t first_ordinal, uint32_t last_ordinal);
+#if defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+void CHFRSCANNER_UpdateCssDetection(void);
+#endif
 #endif
 
 void CHFRSCANNER_Found(void);

App/ui/main.c

@@ -1233,6 +1233,26 @@ static void UI_FormatFrequency(uint32_t freq, char *buffer) {
     sprintf(buffer, "%3u.%05u", freq / 100000, freq % 100000);
 }
 
+#if defined(ENABLE_SCAN_RANGES) && defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+static void UI_PrintScanRangeCss(char *String, uint8_t LabelX, uint8_t ValueX, uint8_t Line)
+{
+    if (gScanRangeCssType == CODE_TYPE_CONTINUOUS_TONE)
+    {
+        strcpy(String, "CTCSS");
+        UI_PrintStringSmallNormalInverse(String, LabelX, 0, Line);
+        sprintf(String, "%u.%uHz", CTCSS_Options[gScanRangeCssCode] / 10, CTCSS_Options[gScanRangeCssCode] % 10);
+    }
+    else
+    {
+        strcpy(String, "DCS");
+        UI_PrintStringSmallNormalInverse(String, LabelX, 0, Line);
+        sprintf(String, "D%03o%c", DCS_Options[gScanRangeCssCode], gScanRangeCssType == CODE_TYPE_REVERSE_DIGITAL ? 'I' : 'N');
+    }
+
+    UI_PrintStringSmallNormal(String, ValueX, 0, Line);
+}
+#endif
+
 void UI_DisplayMain(void)
 {
     char               String[22];
@@ -1331,6 +1351,11 @@ void UI_DisplayMain(void)
                     UI_FormatFrequency(gScanRangeStop, String);
                     UI_PrintStringSmallNormal(String, 56, 0, line + shift + 1);
 
+#if defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+                    if (!isMainOnly() && gScanRangeCssCode != 0xFF)
+                        UI_PrintScanRangeCss(String, 6, 48, line + 2);
+#endif
+
                     if (!isMainOnly())
                         continue;
                 }
@@ -1344,6 +1369,12 @@ void UI_DisplayMain(void)
                 UI_PrintStringSmallNormal(String, 56, 0, line);
                 UI_FormatFrequency(gScanRangeStop, String);
                 UI_PrintStringSmallNormal(String, 56, 0, line + 1);
+
+#if defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+                if (gScanRangeCssCode != 0xFF)
+                    UI_PrintScanRangeCss(String, 2, 44, line + 2);
+#endif
+
                 continue;
 #endif
             }
@@ -2172,6 +2203,11 @@ void UI_DisplayMain(void)
     UI_MAIN_PrintAGC(false);
 #endif
 
+#if defined(ENABLE_SCAN_RANGES) && defined(ENABLE_FEAT_F4HWN) && defined(ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE) && ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE
+    if (isMainOnly() && gScanRangeStart && gScanRangeCssCode != 0xFF)
+        UI_PrintScanRangeCss(String, 2, 46, 6);
+#endif
+
     if (center_line == CENTER_LINE_NONE)
     {   // we're free to use the middle line
 

CMakePresets.json

@@ -71,6 +71,7 @@
                 "ENABLE_FEAT_F4HWN_SCAN_PROGRESS": false,
                 "ENABLE_FEAT_F4HWN_SCAN_FASTER": false,
                 "ENABLE_FEAT_F4HWN_SCAN_RSSI": false,
+                "ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE": false,
                 "ENABLE_FEAT_F4HWN_BEAM": false,
                 "ENABLE_FEAT_F4HWN_LOGO": false,
                 "ENABLE_FEAT_F4HWN_LOGO_SAV": false,
@@ -201,6 +202,7 @@
                 "ENABLE_FEAT_F4HWN_SCAN_PROGRESS": true,
                 "ENABLE_FEAT_F4HWN_SCAN_FASTER": true,
                 "ENABLE_FEAT_F4HWN_SCAN_RSSI": true,
+                "ENABLE_FEAT_F4HWN_SCAN_SUBAUDIBLE": true,
                 "ENABLE_FEAT_F4HWN_BEAM": true,
                 "ENABLE_FEAT_F4HWN_QRCODE": true,
                 "ENABLE_FEAT_F4HWN_MEM": true,