扩展FM频率范围为 64mhz - 108mhz

app/fm.c

@@ -62,7 +62,7 @@ static void Key_FUNC(KEY_Code_t Key, uint8_t state);
 
 bool FM_CheckValidChannel(uint8_t Channel)
 {
-return (Channel < ARRAY_SIZE(gFM_Channels) && (gFM_Channels[Channel] >= 760 && gFM_Channels[Channel] < 1080));
+return (Channel < ARRAY_SIZE(gFM_Channels) && (gFM_Channels[Channel] >= 640 && gFM_Channels[Channel] < 1080));
 }
 
 uint8_t FM_FindNextChannel(uint8_t Channel, uint8_t Direction)

driver/bk1080.c

@@ -19,63 +19,131 @@
 #include "driver/gpio.h"
 #include "driver/i2c.h"
 #include "driver/system.h"
+#include "frequencies.h"
 #include "misc.h"
 
-#ifndef ARRAY_SIZE
+//#define CHAN_SPACING     0u  // 200kHz
-	#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+//#define CHAN_SPACING     1u  // 100kHz
-#endif
+#define   CHAN_SPACING     2u  // 50kHz
+
+#define VOLUME             15u
+
+#define SEEK_THRESHOLD     10u
+
+const freq_band_table_t FM_RADIO_FREQ_BAND_TABLE[] =
+{
+	{875, 1080},   // 87.5 ~ 108 MHz
+	{760, 1080},   // 76   ~ 108 MHz
+	{760,  900},   // 76   ~  90 MHz
+	{640,  760}    // 64   ~  76 MHz
+};
 
 static const uint16_t BK1080_RegisterTable[] =
 {
-	0x0008, 0x1080, 0x0201, 0x0000, 0x40C0, 0x0A1F, 0x002E, 0x02FF,
+	0x0008,                 // 0x00
-	0x5B11, 0x0000, 0x411E, 0x0000, 0xCE00, 0x0000, 0x0000, 0x1000,
+	0x1080,                 // 0x01   chip ID
-	0x3197, 0x0000, 0x13FF, 0x9852, 0x0000, 0x0000, 0x0008, 0x0000,
+	(1u << 9) | (1u << 0),  // 0x02   0x0201  0000001000000001
-	0x51E1, 0xA8BC, 0x2645, 0x00E4, 0x1CD8, 0x3A50, 0xEAE0, 0x3000,
+	0x0000,                 // 0x03
-	0x0200, 0x0000,
+	0x40C0,                 // 0x04   0100000011000000
+	(SEEK_THRESHOLD << 8) | (0u << 6) | (CHAN_SPACING << 4) | (VOLUME << 0), // 0x0A1F,  // 0x05  00001010 00 01 1111
+	0x002E,                 // 0x06   0000000000101110
+	0x02FF,                 // 0x07   0000001011111111
+	0x5B11,                 // 0x08   0101101100010001
+	0x0000,                 // 0x09
+	0x411E,                 // 0x0A   0100000100011110
+	0x0000,                 // 0x0B
+	0xCE00,                 // 0x0C   1100111000000000
+	0x0000,                 // 0x0D
+	0x0000,                 // 0x0E
+	0x1000,                 // 0x0F   1000000000000000
+	0x3197,                 // 0x10   0011000110010111
+	0x0000,                 // 0x11
+	0x13FF,                 // 0x12   0001001111111111
+	0x9852,                 // 0x13   1001100001010010
+	0x0000,                 // 0x14
+	0x0000,                 // 0x15
+	0x0008,                 // 0x16
+	0x0000,                 // 0x17
+	0x51E1,                 // 0x18   0101000111100001
+	0xA8BC,                 // 0x19   1010100010111100
+	0x2645,                 // 0x1A   0010011001000101
+	0x00E4,                 // 0x1B   0000000011100100
+	0x1CD8,                 // 0x1C   0001110011011000
+	0x3A50,                 // 0x1D   0011101001010000
+	0xEAE0,                 // 0x1E   1110101011100000
+	0x3000,                 // 0x1F   0011000000000000
+	0x0200,                 // 0x20   0010000000000000
+	0x0000                  // 0x21
 };
 
-static bool gIsInitBK1080;
-
 uint16_t BK1080_BaseFrequency;
 uint16_t BK1080_FrequencyDeviation;
 
-void BK1080_Init(uint16_t Frequency, bool bDoScan)
+bool     is_init;
+uint16_t BK1080_freq_lower;
+uint16_t BK1080_freq_upper;
+uint16_t BK1080_freq_base;
+int16_t  BK1080_freq_offset;
+
+void BK1080_Init(const uint16_t frequency, const bool initialise)
 {
 	unsigned int i;
 
-	if (bDoScan)
+	// determine the lower and upper frequency limits when multiple bands are used
+
+	if (!is_init)
 	{
+		BK1080_freq_base   = 0;
+		BK1080_freq_offset = 0;
+
+		BK1080_freq_lower = 0xffff;
+		BK1080_freq_upper = 0;
+
+		for (i = 0; i < ARRAY_SIZE(FM_RADIO_FREQ_BAND_TABLE); i++)
+		{
+			const uint16_t lower = FM_RADIO_FREQ_BAND_TABLE[i].lower;
+			const uint16_t upper = FM_RADIO_FREQ_BAND_TABLE[i].upper;
+	
+			if (BK1080_freq_lower > lower)
+				BK1080_freq_lower = lower;
+
+			if (BK1080_freq_upper < upper)
+				BK1080_freq_upper = upper;
+		}
+	}
+
+	if (initialise)
+	{	// init and enable the chip
+
 		GPIO_ClearBit(&GPIOB->DATA, GPIOB_PIN_BK1080);
 
-		if (!gIsInitBK1080)
+		if (!is_init)
 		{
 			for (i = 0; i < ARRAY_SIZE(BK1080_RegisterTable); i++)
 				BK1080_WriteRegister(i, BK1080_RegisterTable[i]);
 
 			SYSTEM_DelayMs(250);
 
-			BK1080_WriteRegister(BK1080_REG_25_INTERNAL, 0xA83C);
+			BK1080_WriteRegister(BK1080_REG_25_INTERNAL, 0xA83C);  // 1010 1000 0011 1100
-			BK1080_WriteRegister(BK1080_REG_25_INTERNAL, 0xA8BC);
+			BK1080_WriteRegister(BK1080_REG_25_INTERNAL, 0xA8BC);  // 1010 1000 1011 1100
 
 			SYSTEM_DelayMs(60);
 
-			gIsInitBK1080 = true;
+			is_init = true;
 		}
 		else
 		{
-			BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, 0x0201);
+			BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, (1u << 9) | (1u << 0));
 		}
 		
-		BK1080_WriteRegister(BK1080_REG_05_SYSTEM_CONFIGURATION2, 0x0A5F);
+		BK1080_WriteRegister(BK1080_REG_05_SYSTEM_CONFIGURATION2, 0x0A5F);  // 0000 1010 0101 1111
-		BK1080_WriteRegister(BK1080_REG_03_CHANNEL, Frequency - 760);
 
-		SYSTEM_DelayMs(10);
+		BK1080_SetFrequency(frequency);
-
-		BK1080_WriteRegister(BK1080_REG_03_CHANNEL, (Frequency - 760) | 0x8000);
 	}
 	else
-	{
+	{	// disable the chip
-		BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, 0x0241);
+
+		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);
 	}
 }
@@ -83,13 +151,11 @@ void BK1080_Init(uint16_t Frequency, bool bDoScan)
 uint16_t BK1080_ReadRegister(BK1080_Register_t Register)
 {
 	uint8_t Value[2];
-
 	I2C_Start();
 	I2C_Write(0x80);
 	I2C_Write((Register << 1) | I2C_READ);
 	I2C_ReadBuffer(Value, sizeof(Value));
 	I2C_Stop();
-
 	return (Value[0] << 8) | Value[1];
 }
 
@@ -103,16 +169,42 @@ void BK1080_WriteRegister(BK1080_Register_t Register, uint16_t Value)
 	I2C_Stop();
 }
 
-void BK1080_Mute(bool Mute)
+void BK1080_Mute(const bool Mute)
 {
-	BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, Mute ? 0x4201 : 0x0201);
+	BK1080_WriteRegister(BK1080_REG_02_POWER_CONFIGURATION, (1u << 9) | (1u << 0) | (Mute ? 1u << 14 : 0u));
 }
 
 void BK1080_SetFrequency(uint16_t Frequency)
 {
-	BK1080_WriteRegister(BK1080_REG_03_CHANNEL, Frequency - 760);
+	int      channel;
-	SYSTEM_DelayMs(10);
+	uint16_t band = 0;
-	BK1080_WriteRegister(BK1080_REG_03_CHANNEL, (Frequency - 760) | 0x8000);
+
+	// 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))
+	{
+		Frequency = BK1080_freq_lower;
+	}
+
+//	channel =  (int)Frequency - FM_RADIO_FREQ_BAND_TABLE[band].lower;       // 100kHz channel spacing
+	channel = ((int)Frequency - FM_RADIO_FREQ_BAND_TABLE[band].lower) * 2;  // 50kHz channel spacing
+	channel = (channel < 0) ? 0 : (channel > 1023) ? 1023 : channel;
+
+	BK1080_WriteRegister(BK1080_REG_05_SYSTEM_CONFIGURATION2, (SEEK_THRESHOLD << 8) | (band << 6) | (CHAN_SPACING << 4) | (VOLUME << 0));
+
+	BK1080_WriteRegister(BK1080_REG_03_CHANNEL, (uint16_t)channel);
+//	SYSTEM_DelayMs(1);
+	BK1080_WriteRegister(BK1080_REG_03_CHANNEL, (uint16_t)channel | (1u << 15));
+}
+
+int16_t BK1080_get_freq_offset(const uint16_t Frequency)
+{
+	BK1080_freq_base   = Frequency;
+	BK1080_freq_offset = (int16_t)BK1080_ReadRegister(BK1080_REG_07) / 16;
+	return BK1080_freq_offset;
 }
 
 void BK1080_GetFrequencyDeviation(uint16_t Frequency)

settings.c

@@ -98,7 +98,7 @@ void SETTINGS_InitEEPROM(void)
 		} __attribute__((packed)) FM;
 
 		EEPROM_ReadBuffer(0x0E88, &FM, 8);
-		gEeprom.FM_LowerLimit = 760;
+		gEeprom.FM_LowerLimit = 640;
 		gEeprom.FM_UpperLimit = 1080;
 		if (FM.SelectedFrequency < gEeprom.FM_LowerLimit || FM.SelectedFrequency > gEeprom.FM_UpperLimit)
 			gEeprom.FM_SelectedFrequency = 960;