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)

external/CMSIS_5/CMSIS/DAP/Firmware/Validation/MDK5/README.md

@@ -0,0 +1,37 @@
+CMSIS-DAP debug unit validation
+-------------------------------
+
+The following debug functionality is tested:
+
+- Execution breakpoint with hit count
+- Breakpoint on read
+- Breakpoint on write
+- Memory read
+- Memory write
+- Register read
+- Register write
+- Single stepping
+- Run/stop debugging
+
+The test is self-contained and can be executed on the hardware target.
+
+To configure the test for a specific hardware target:
+
+1. Open the µVision project and select device mounted on hardware target
+   (automatically selects flash algorithm for download).
+2. Select CMSIS-DAP as the debugger (if not already selected).
+3. Build the project.
+
+To run the test on the hardware target:
+
+1. Connect the CMSIS-DAP debug unit via JTAG/SWD to the hardware target.
+2. Connect the CMSIS-DAP debug unit under test to a PC via USB.
+3. Open the µVision project and start a debug session.
+4. Test results are printed into a `test.log` file.
+
+To run the test on the target in batch mode, open a Command window and execute:
+```
+C:\> .\test.bat
+```
+
+Test results are printed into a `test_results.txt` file.