reduce FM radio compile size if only 1 band used

app/action.c

@@ -346,7 +346,8 @@ void ACTION_Scan(bool bRestart)
 		if (g_current_function != FUNCTION_TRANSMIT)
 		{
 			if (g_fm_radio_mode)
-			{
+			{	// return normal service
+		
 				FM_TurnOff();
 
 				g_input_box_index = 0;
@@ -359,6 +360,8 @@ void ACTION_Scan(bool bRestart)
 				return;
 			}
 
+			// switch to FM radio mode
+
 			g_monitor_enabled = false;
 
 			RADIO_select_vfos();

app/app.c

@@ -469,11 +469,6 @@ bool APP_start_listening(void)
 	if (g_setting_backlight_on_tx_rx >= 2)
 		backlight_turn_on(backlight_tx_rx_time_500ms);
 
-	#ifdef ENABLE_FMRADIO
-		if (g_fm_radio_mode)
-			BK1080_Init(0, false);
-	#endif
-
 	#ifdef ENABLE_MDC1200
 //		MDC1200_reset_rx();
 	#endif
@@ -558,6 +553,11 @@ bool APP_start_listening(void)
 		AUDIO_set_mod_mode(g_rx_vfo->am_mode);
 	#endif
 
+	#ifdef ENABLE_FMRADIO
+		if (g_fm_radio_mode)
+			BK1080_Init(0, false);		// disable the FM radio audio
+	#endif
+
 	// enable the speaker
 	g_speaker_enabled = true;
 	GPIO_SetBit(&GPIOC->DATA, GPIOC_PIN_SPEAKER);

app/fm.c

@@ -706,6 +706,7 @@ void FM_Start(void)
 	g_fm_scan_state        = FM_SCAN_OFF;
 	g_fm_restore_tick_10ms = 0;
 
+	// enable the FM radio chip and audio
 	BK1080_Init(g_eeprom.fm_frequency_playing, true);
 
 	g_speaker_enabled = true;

driver/bk1080.c

@@ -104,10 +104,12 @@ uint16_t BK1080_freq_upper;
 uint16_t BK1080_BaseFrequency;
 uint16_t BK1080_FrequencyDeviation;
 
-void BK1080_Init(uint16_t Frequency, bool bDoScan)
+void BK1080_Init(const uint16_t frequency, const bool initialise)
 {
 	unsigned int i;
 
+	#if defined(ENABLE_FMRADIO_64_108)
+		// determine the lower and upper frequency limits
 		BK1080_freq_lower = 0xffff;
 		BK1080_freq_upper = 0;
 		for (i = 0; i < ARRAY_SIZE(FM_RADIO_FREQ_BAND_TABLE); i++)
@@ -125,9 +127,14 @@ void BK1080_Init(uint16_t Frequency, bool bDoScan)
 			if (BK1080_freq_upper < upper)
 				BK1080_freq_upper = upper;
 		}
+	#else
+		BK1080_freq_lower = FM_RADIO_FREQ_BAND_TABLE[0].lower;
+		BK1080_freq_upper = FM_RADIO_FREQ_BAND_TABLE[0].upper;
+	#endif
+
+	if (initialise)
+	{	// init and enable the chip
 
-	if (bDoScan)
-	{
 		GPIO_ClearBit(&GPIOB->DATA, GPIOB_PIN_BK1080);
 
 		if (!is_init)
@@ -149,10 +156,11 @@ void BK1080_Init(uint16_t Frequency, bool bDoScan)
 			BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, (1u << 9) | (1u << 0));
 		}
 
-		BK1080_SetFrequency(Frequency);
+		BK1080_SetFrequency(frequency);
 	}
 	else
-	{
+	{	// disable the chip
+
 		BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, (1u << 9) | (1u << 6) | (1u << 0)); // 0x0241); // 0000 0010 0100 0001
 		GPIO_SetBit(&GPIOB->DATA, GPIOB_PIN_BK1080);
 	}
@@ -181,29 +189,31 @@ void BK1080_WriteRegister(BK1080_Register_t Register, uint16_t Value)
 
 void BK1080_Mute(bool Mute)
 {
-	uint16_t val = (1u << 9) | (1u << 0);
-	if (Mute)
-		val |= 1u << 14;
-	BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, val);
-	
+	BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, (1u << 9) | (1u << 0) | (Mute ? 1u << 14 : 0u));
 }
 
 void BK1080_SetFrequency(uint16_t Frequency)
 {
-	uint16_t band;
 	uint16_t channel;
+	uint16_t band = 0;
 
+//	#if (ARRAY_SIZE(FM_RADIO_FREQ_BAND_TABLE) > 1)   // compiler doesn't like this :(
+	#if defined(ENABLE_FMRADIO_64_108)
 		// determine which band to use
 		for (band = 0; band < ARRAY_SIZE(FM_RADIO_FREQ_BAND_TABLE); band++)
 			if (Frequency >= FM_RADIO_FREQ_BAND_TABLE[band].lower && Frequency < FM_RADIO_FREQ_BAND_TABLE[band].upper)
 				break;
 
 		if (band >= ARRAY_SIZE(FM_RADIO_FREQ_BAND_TABLE))
-		return;
-	
-	channel = Frequency - FM_RADIO_FREQ_BAND_TABLE[band].lower;  // 100kHz channel spacing
+		{
+			Frequency = BK1080_freq_lower;
+	//		return;
+		}
 
 		BK1080_WriteRegister(BK1080_REG_05_SYSTEM_CONFIGURATION2, (SEEK_THRESHOLD << 8) | (band << 6) | (CHAN_SPACING << 4) | (VOLUME << 0));
+	#endif
+
+	channel = Frequency - FM_RADIO_FREQ_BAND_TABLE[band].lower;  // 100kHz channel spacing
 
 	BK1080_WriteRegister(BK1080_REG_03_CHANNEL, channel);
 	BK1080_WriteRegister(BK1080_REG_03_CHANNEL, channel | (1u << 15));

driver/bk1080.h

@@ -27,7 +27,7 @@ extern uint16_t BK1080_freq_upper;
 extern uint16_t BK1080_BaseFrequency;
 extern uint16_t BK1080_FrequencyDeviation;
 
-void     BK1080_Init(uint16_t Frequency, bool bDoScan);
+void     BK1080_Init(const uint16_t frequency, const bool initialise);
 uint16_t BK1080_ReadRegister(BK1080_Register_t Register);
 void     BK1080_WriteRegister(BK1080_Register_t Register, uint16_t Value);
 void     BK1080_Mute(bool Mute);