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)

utils/clean.bat

@@ -0,0 +1,24 @@
+@echo off
+
+del /S /Q *.~*
+del /S /Q *.map
+del /S /Q *.tds
+del /S /Q *.obj
+del /S /Q *.db
+del /S /Q *.ilc
+del /S /Q *.ild
+del /S /Q *.ilf
+del /S /Q *.ils
+del /S /Q *.dcu
+del /S /Q *.dsk
+
+rd /S /Q Debug
+rd /S /Q Release
+rd /S /Q ipch
+
+del /S gain_table.c
+del /S uv-k5_small.c
+del /S uv-k5_small_bold.c
+
+::pause
+@echo on