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/flashlight.c

@@ -0,0 +1,66 @@
+#ifdef ENABLE_FLASHLIGHT
+
+#include "driver/gpio.h"
+#include "bsp/dp32g030/gpio.h"
+
+#include "flashlight.h"
+
+enum FlashlightMode_t  gFlashLightState;
+
+void FlashlightTimeSlice()
+{
+	if (gFlashLightState == FLASHLIGHT_BLINK && (gFlashLightBlinkCounter & 15u) == 0) {
+		GPIO_FlipBit(&GPIOC->DATA, GPIOC_PIN_FLASHLIGHT);
+		return;
+	}
+
+	if (gFlashLightState == FLASHLIGHT_SOS) {
+		const uint16_t u = 15;
+		static uint8_t c;
+		static uint16_t next;
+
+		if (gFlashLightBlinkCounter - next > 7 * u) {
+			c = 0;
+			next = gFlashLightBlinkCounter + 1;
+			return;
+		}
+
+		if (gFlashLightBlinkCounter == next) {
+			if (c==0) {
+				GPIO_ClearBit(&GPIOC->DATA, GPIOC_PIN_FLASHLIGHT);
+			} else {
+				GPIO_FlipBit(&GPIOC->DATA, GPIOC_PIN_FLASHLIGHT);
+			}
+
+			if (c >= 18) {
+				next = gFlashLightBlinkCounter + 7 * u;
+				c = 0;
+			} else if(c==7 || c==9 || c==11) {
+				next = gFlashLightBlinkCounter + 3 * u;
+			} else {
+				next = gFlashLightBlinkCounter + u;
+			}
+			c++;
+		}
+	}
+}
+
+void ACTION_FlashLight(void)
+{
+	switch (gFlashLightState) {
+		case FLASHLIGHT_OFF:
+			gFlashLightState++;
+			GPIO_SetBit(&GPIOC->DATA, GPIOC_PIN_FLASHLIGHT);
+			break;
+		case FLASHLIGHT_ON:
+		case FLASHLIGHT_BLINK:
+			gFlashLightState++;
+			break;
+		case FLASHLIGHT_SOS:
+		default:
+			gFlashLightState = 0;
+			GPIO_ClearBit(&GPIOC->DATA, GPIOC_PIN_FLASHLIGHT);
+	}
+}
+
+#endif