static void si4700_set_frequency(int freq)
{
static const unsigned int spacings[3] =
{
200000, /* SYSCONFIG2_SPACE_200KHZ */
100000, /* SYSCONFIG2_SPACE_100KHZ */
50000, /* SYSCONFIG2_SPACE_50KHZ */
};
static const unsigned int bands[3] =
{
87500000, /* SYSCONFIG2_BAND_875_1080 */
76000000, /* SYSCONFIG2_BAND_760_1080 */
76000000, /* SYSCONFIG2_BAND_760_900 */
};
/* check BAND and spacings */
int space = SYSCONFIG2_SPACEr(cache[SYSCONFIG2]);
int band = SYSCONFIG2_BANDr(cache[SYSCONFIG2]);
int chan = (freq - bands[band]) / spacings[space];
int readchan;
do
{
/* tuning should be done within 60 ms according to the datasheet */
si4700_write_reg(CHANNEL, CHANNEL_CHANw(chan) | CHANNEL_TUNE);
sleep(HZ * 60 / 1000);
/* get tune result */
readchan = si4700_read_reg(READCHAN) & READCHAN_READCHAN;
si4700_write_clear(CHANNEL, CHANNEL_TUNE);
} while (!((cache[STATUSRSSI] & STATUSRSSI_STC) && (readchan == chan)));
}
static void rda5802_set_frequency(int freq)
{
int i;
uint16_t readchan;
/* check BAND and spacings */
int start = CHANNEL_BANDr(cache[CHANNEL]) & 1 ? 76000000 : 87000000;
int chan = (freq - start) / 50000;
for (i = 0; i < 5; i++) {
/* tune and wait a bit */
rda5802_write_masked(CHANNEL, CHANNEL_CHANw(chan) | CHANNEL_TUNE,
CHANNEL_CHAN | CHANNEL_TUNE);
rda5802_write_cache();
sleep(HZ * 70 / 1000);
rda5802_write_clear(CHANNEL, CHANNEL_TUNE);
rda5802_write_cache();
/* check if tuning was successful */
readchan = rda5802_read_reg(READCHAN);
if (readchan & READCHAN_STC) {
if (READCHAN_READCHANr(readchan) == chan) {
break;
}
}
}
}
static void rda5802_set_frequency(int freq)
{
int i;
uint16_t readchan;
static const int spacings[] = {100000, 200000, 50000, 50000};
static const int bandstart[] = {87000000, 76000000, 76000000, 65000000};
/* calculate channel number */
int start = bandstart[CHANNEL_BANDr(cache[CHANNEL])];
int space = spacings[CHANNEL_SPACEr(cache[CHANNEL])];
int chan = (freq - start) / space;
for (i = 0; i < 5; i++) {
/* tune and wait a bit */
rda5802_write_masked(CHANNEL, CHANNEL_CHANw(chan) | CHANNEL_TUNE,
CHANNEL_CHAN | CHANNEL_TUNE);
rda5802_write_cache();
sleep(HZ * 70 / 1000);
rda5802_write_clear(CHANNEL, CHANNEL_TUNE);
rda5802_write_cache();
/* check if tuning was successful */
readchan = rda5802_read_reg(READCHAN);
if (readchan & READCHAN_STC) {
if (READCHAN_READCHANr(readchan) == chan) {
break;
}
}
}
}