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osmosdr: implement setting of sample rate

This commit is contained in:
Dimitri Stolnikov 2012-06-02 23:57:17 +02:00
parent c6fa979160
commit 842e48d101
1 changed files with 28 additions and 4 deletions
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32
lib/osmosdr/osmosdr_src_c.cc
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@ -119,7 +119,11 @@ osmosdr_src_c::osmosdr_src_c (const std::string &args)
if (ret < 0)
throw std::runtime_error("Failed to disable IQ swapping.");
ret = osmosdr_set_sample_rate( _dev, 1000000 );
ret = osmosdr_set_fpga_decimation( _dev, 3 ); /* DS register 0x06 */
if (ret < 0)
throw std::runtime_error("Failed to set default decimation.");
ret = osmosdr_set_sample_rate( _dev, 500000 );
if (ret < 0)
throw std::runtime_error("Failed to set default samplerate.");
@ -280,8 +284,8 @@ osmosdr::meta_range_t osmosdr_src_c::get_sample_rates()
{
osmosdr::meta_range_t range;
range += osmosdr::range_t( 500000 ); // known to work
range += osmosdr::range_t( 1000000 ); // known to work
for (unsigned int i = 64; i >= 4; i >>= 1 ) /* FIXME: hardcoded decimation */
range += osmosdr::range_t( 4000000 / i ); /* FIXME: hardcoded clock */
// TODO: read from the libosmosdr as soon as the api is available
@ -290,7 +294,27 @@ osmosdr::meta_range_t osmosdr_src_c::get_sample_rates()
double osmosdr_src_c::set_sample_rate(double rate)
{
if (_dev) {
if ( _dev && rate >= 62500.0 ) {
int decimation = 4000000 / int(rate); /* FIXME: hardcoded clock */
int reg_value;
if (decimation == 4)
reg_value = 2;
else if (decimation == 8)
reg_value = 3;
else if (decimation == 16)
reg_value = 4;
else if (decimation == 32)
reg_value = 5;
else if (decimation == 64)
reg_value = 6;
else {
reg_value = 3;
rate = 500e6;
}
osmosdr_set_fpga_decimation( _dev, reg_value );
osmosdr_set_sample_rate( _dev, (uint32_t)rate );
}