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Diffstat (limited to 'firmware/drivers/tuner/si4700.c')
-rw-r--r--firmware/drivers/tuner/si4700.c145
1 files changed, 106 insertions, 39 deletions
diff --git a/firmware/drivers/tuner/si4700.c b/firmware/drivers/tuner/si4700.c
index a55a8cfcc4..f68ea5a750 100644
--- a/firmware/drivers/tuner/si4700.c
+++ b/firmware/drivers/tuner/si4700.c
@@ -31,24 +31,84 @@
#define I2C_ADR 0x20
-/* I2C writes start at register 02h so the first two bytes are
- 02h, next two 03h, etc. */
-static unsigned char write_bytes[8]; /* registers 02 - 05 */
+#define DEVICEID 0x0
+#define CHIPID 0x1
+#define POWERCFG 0x2
+#define CHANNEL 0x3
+#define SYSCONFIG1 0x4
+#define SYSCONFIG2 0x5
+#define SYSCONFIG3 0x6
+#define TEST1 0x7
+#define TEST2 0x8
+#define BOOTCONFIG 0x9
+#define STATUSRSSI 0xA
+#define READCHAN 0xB
+#define RDSA 0xC
+#define RDSB 0xD
+#define RDSC 0xE
+#define RDSD 0xF
+
+/* some models use the internal 32 kHz oscillator which needs special attention
+ during initialisation, power-up and power-down.
+*/
+#if defined(SANSA_CLIP) || defined(SANSA_E200V2) || defined(SANSA_FUZE)
+#define USE_INTERNAL_OSCILLATOR
+#endif
+
static bool tuner_present = false;
+static unsigned short cache[16];
+
+/* reads <len> registers from radio at offset 0x0A into cache */
+static void si4700_read(int len)
+{
+ int i;
+ unsigned char buf[32];
+ unsigned char *ptr = buf;
+ unsigned short data;
+
+ fmradio_i2c_read(I2C_ADR, buf, len * 2);
+ for (i = 0; i < len; i++) {
+ data = ptr[0] << 8 | ptr[1];
+ cache[(i + STATUSRSSI) & 0xF] = data;
+ ptr += 2;
+ }
+}
+
+/* writes <len> registers from cache to radio at offset 0x02 */
+static void si4700_write(int len)
+{
+ int i;
+ unsigned char buf[32];
+ unsigned char *ptr = buf;
+ unsigned short data;
+
+ for (i = 0; i < len; i++) {
+ data = cache[(i + POWERCFG) & 0xF];
+ *ptr++ = (data >> 8) & 0xFF;
+ *ptr++ = data & 0xFF;
+ }
+ fmradio_i2c_write(I2C_ADR, buf, len * 2);
+}
+
void si4700_init(void)
{
- unsigned char read_bytes[32];
tuner_power(true);
- fmradio_i2c_read(I2C_ADR, read_bytes, sizeof(read_bytes));
- if ((read_bytes[12] << 8 | read_bytes[13]) == 0x1242)
+ /* read all registers */
+ si4700_read(16);
+
+ /* check device id */
+ if (cache[DEVICEID] == 0x1242)
{
tuner_present = true;
- /* fill in the initial values in write_bytes */
- memcpy(&write_bytes[0], &read_bytes[16], sizeof(write_bytes));
- /* -6dB volume, keep everything else as default */
- write_bytes[7] = (write_bytes[7] & ~0xf) | 0xc;
+
+#ifdef USE_INTERNAL_OSCILLATOR
+ /* enable the internal oscillator */
+ cache[TEST1] |= (1 << 15); /* XOSCEN */
+ si4700_write(6);
+ sleep(HZ/2);
+#endif
}
tuner_power(false);
@@ -56,20 +116,19 @@ void si4700_init(void)
static void si4700_tune(void)
{
- unsigned char read_bytes[1];
-
- write_bytes[2] |= (1 << 7); /* Set TUNE high to start tuning */
- fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
+ cache[CHANNEL] |= (1 << 15); /* Set TUNE high to start tuning */
+ si4700_write(2);
do
{
- sleep(HZ/50);
- fmradio_i2c_read(I2C_ADR, read_bytes, 1);
+ /* tuning should be done within 60 ms according to the datasheet */
+ sleep(HZ * 60 / 1000);
+ si4700_read(2);
}
- while (!(read_bytes[0] & (1 << 6))); /* STC high == Seek/Tune complete */
+ while (!(cache[STATUSRSSI] & (1 << 14))); /* STC high */
- write_bytes[2] &= ~(1 << 7); /* Set TUNE low */
- fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
+ cache[CHANNEL] &= ~(1 << 15); /* Set TUNE low */
+ si4700_write(2);
}
/* tuner abstraction layer: set something to the tuner */
@@ -80,13 +139,25 @@ int si4700_set(int setting, int value)
case RADIO_SLEEP:
if (value)
{
- write_bytes[1] = (1 | (1 << 6)); /* ENABLE high, DISABLE high */
+ /* power down */
+ cache[POWERCFG] = (1 | (1 << 6)); /* ENABLE high, DISABLE high */
+ si4700_write(1);
}
else
{
- write_bytes[1] = 1; /* ENABLE high, DISABLE low */
+ /* power up */
+ cache[POWERCFG] = 1; /* ENABLE high, DISABLE low */
+ si4700_write(1);
+ sleep(110 * HZ / 1000);
+
+ /* update register cache */
+ si4700_read(16);
+
+ /* -6dB volume, keep everything else as default */
+ cache[SYSCONFIG2] = (cache[SYSCONFIG2] & ~0xF) | 0xC;
+ si4700_write(5);
}
- break;
+ return 1;
case RADIO_FREQUENCY:
{
@@ -95,9 +166,9 @@ int si4700_set(int setting, int value)
200000, 100000, 50000
};
unsigned int chan;
- unsigned int spacing = spacings[(write_bytes[7] >> 4) & 3] ;
+ unsigned int spacing = spacings[(cache[5] >> 4) & 3] ;
- if (write_bytes[7] & (3 << 6)) /* check BAND */
+ if (cache[SYSCONFIG2] & (3 << 6)) /* check BAND */
{
chan = (value - 76000000) / spacing;
}
@@ -106,9 +177,7 @@ int si4700_set(int setting, int value)
chan = (value - 87500000) / spacing;
}
- write_bytes[2] = (write_bytes[2] & ~3) | ((chan & (3 << 8)) >> 8);
- write_bytes[3] = (chan & 0xff);
- fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
+ cache[CHANNEL] = (cache[CHANNEL] & ~0x3FF) | chan;
si4700_tune();
return 1;
}
@@ -121,12 +190,12 @@ int si4700_set(int setting, int value)
if (value)
{
/* mute */
- write_bytes[0] &= ~(1 << 6);
+ cache[POWERCFG] &= ~(1 << 14);
}
else
{
/* unmute */
- write_bytes[0] |= (1 << 6);
+ cache[POWERCFG] |= (1 << 14);
}
break;
@@ -135,20 +204,20 @@ int si4700_set(int setting, int value)
const struct si4700_region_data *rd =
&si4700_region_data[value];
- write_bytes[4] = ((write_bytes[4] & ~(1 << 3)) | (rd->deemphasis << 3));
- write_bytes[7] = ((write_bytes[7] & ~(3 << 6)) | (rd->band << 6));
- write_bytes[7] = ((write_bytes[7] & ~(3 << 4)) | (rd->spacing << 4));
+ cache[SYSCONFIG1] = (cache[SYSCONFIG1] & ~(1 << 11)) | (rd->deemphasis << 11);
+ cache[SYSCONFIG2] = (cache[SYSCONFIG2] & ~(3 << 6)) | (rd->band << 6);
+ cache[SYSCONFIG2] = (cache[SYSCONFIG2] & ~(3 << 4)) | (rd->spacing << 4);
break;
}
case RADIO_FORCE_MONO:
if (value)
{
- write_bytes[0] |= (1 << 5);
+ cache[POWERCFG] |= (1 << 13);
}
else
{
- write_bytes[0] &= ~(1 << 5);
+ cache[POWERCFG] &= ~(1 << 13);
}
break;
@@ -156,15 +225,13 @@ int si4700_set(int setting, int value)
return -1;
}
- fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
+ si4700_write(5);
return 1;
}
/* tuner abstraction layer: read something from the tuner */
int si4700_get(int setting)
{
- /* I2C reads start with register 0xA */
- unsigned char read_bytes[1];
int val = -1; /* default for unsupported query */
switch(setting)
@@ -178,8 +245,8 @@ int si4700_get(int setting)
break;
case RADIO_STEREO:
- fmradio_i2c_read(I2C_ADR, read_bytes, sizeof(read_bytes));
- val = (read_bytes[0] & 1); /* ST high == Stereo */
+ si4700_read(1);
+ val = (cache[STATUSRSSI] & (1 << 8)); /* ST high == Stereo */
break;
}