UA1ZBE Custom Firmware v1.0

Features:
- VFO mode with direct frequency input
- POCSAG decoder (512/1200 baud) with BCH(31,21) correction
- Full-screen Spectrum analyzer
- FM Radio receiver
- RSSI signal indicator overlay
- Custom boot splash (UA1ZBE / POCSAG pager / build date)

Architecture:
- app/mode.c — mode dispatcher (VFO/POCSAG/Spectrum/FM)
- app/boot_splash.c — 2-second boot splash
- app/pocsag/ — POCSAG decoder + BCH correction
- app/display_rssi.c — RSSI indicator
- main.c — entry point with custom init
- syscalls.c — bare-metal _sbrk stub

Build: arm-none-eabi-gcc -Os -flto -Wall -Werror -Wextra
Size: 57.9KB Flash / 3.6KB RAM

Controls:
- 0-9: Direct frequency input (VFO)
- SK2: POCSAG mode
- SK1: Spectrum analyzer
- 0: FM Radio
- EXIT: Return to VFO
- F/*: Toggle 512/1200 baud (in POCSAG)

app/common.c

@@ -0,0 +1,77 @@
+#include "app/chFrScanner.h"
+#include "audio.h"
+#include "functions.h"
+#include "misc.h"
+#include "settings.h"
+#include "ui/ui.h"
+
+void COMMON_KeypadLockToggle() 
+{
+
+    if (gScreenToDisplay != DISPLAY_MENU &&
+        gCurrentFunction != FUNCTION_TRANSMIT)
+    {	// toggle the keyboad lock
+
+        #ifdef ENABLE_VOICE
+            gAnotherVoiceID = gEeprom.KEY_LOCK ? VOICE_ID_UNLOCK : VOICE_ID_LOCK;
+        #endif
+
+        gEeprom.KEY_LOCK = !gEeprom.KEY_LOCK;
+
+        gRequestSaveSettings = true;
+    }
+}
+
+void COMMON_SwitchVFOs()
+{
+#ifdef ENABLE_SCAN_RANGES    
+    gScanRangeStart = 0;
+#endif
+    gEeprom.TX_VFO ^= 1;
+
+    if (gEeprom.CROSS_BAND_RX_TX != CROSS_BAND_OFF)
+        gEeprom.CROSS_BAND_RX_TX = gEeprom.TX_VFO + 1;
+    if (gEeprom.DUAL_WATCH != DUAL_WATCH_OFF)
+        gEeprom.DUAL_WATCH = gEeprom.TX_VFO + 1;
+
+    gRequestSaveSettings  = 1;
+    gFlagReconfigureVfos  = true;
+    gScheduleDualWatch = true;
+
+    gRequestDisplayScreen = DISPLAY_MAIN;
+}
+
+void COMMON_SwitchVFOMode()
+{
+#ifdef ENABLE_NOAA
+    if (gEeprom.VFO_OPEN && !IS_NOAA_CHANNEL(gTxVfo->CHANNEL_SAVE))
+#else
+    if (gEeprom.VFO_OPEN)
+#endif
+    {
+        if (IS_MR_CHANNEL(gTxVfo->CHANNEL_SAVE))
+        {	// swap to frequency mode
+            gEeprom.ScreenChannel[gEeprom.TX_VFO] = gEeprom.FreqChannel[gEeprom.TX_VFO];
+            #ifdef ENABLE_VOICE
+                gAnotherVoiceID        = VOICE_ID_FREQUENCY_MODE;
+            #endif
+            gRequestSaveVFO            = true;
+            gVfoConfigureMode          = VFO_CONFIGURE_RELOAD;
+            return;
+        }
+
+        uint8_t Channel = RADIO_FindNextChannel(gEeprom.MrChannel[gEeprom.TX_VFO], 1, false, 0);
+        if (Channel != 0xFF)
+        {	// swap to channel mode
+            gEeprom.ScreenChannel[gEeprom.TX_VFO] = Channel;
+            #ifdef ENABLE_VOICE
+                AUDIO_SetVoiceID(0, VOICE_ID_CHANNEL_MODE);
+                AUDIO_SetDigitVoice(1, Channel + 1);
+                gAnotherVoiceID = (VOICE_ID_t)0xFE;
+            #endif
+            gRequestSaveVFO     = true;
+            gVfoConfigureMode   = VFO_CONFIGURE_RELOAD;
+            return;
+        }
+    }
+}