diff options
| -rw-r--r-- | firmware/drivers/tuner/si4700.c | 145 |
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; } |