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Use register interface to set sample rate

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This commit is contained in:
Michael Ossmann
2026-02-24 17:30:00 -05:00
parent 4baf480c9d
commit 4eea497e44
2 changed files with 27 additions and 8 deletions
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34
host/libhackrf/src/hackrf.c
View File

@@ -1822,9 +1822,7 @@ typedef struct {
} set_fracrate_params_t;
/*
* You should probably use hackrf_set_sample_rate() below instead of this
* function. They both result in automatic baseband filter selection as
* described below.
* @deprecated This has been replaced by @ref hackrf_set_sample_rate
*/
int ADDCALL hackrf_set_sample_rate_manual(
hackrf_device* device,
@@ -1862,12 +1860,9 @@ int ADDCALL hackrf_set_sample_rate_manual(
}
/*
* For anti-aliasing, the baseband filter bandwidth is automatically set to the
* widest available setting that is no more than 75% of the sample rate. This
* happens every time the sample rate is set. If you want to override the
* baseband filter selection, you must do so after setting the sample rate.
* @deprecated This has been replaced by @ref hackrf_set_sample_rate
*/
int ADDCALL hackrf_set_sample_rate(hackrf_device* device, const double freq)
int hackrf_set_sample_rate_frac(hackrf_device* device, const double freq)
{
const int MAX_N = 32;
uint32_t freq_hz, divider;
@@ -1908,6 +1903,29 @@ int ADDCALL hackrf_set_sample_rate(hackrf_device* device, const double freq)
return hackrf_set_sample_rate_manual(device, freq_hz, divider);
}
/*
* For anti-aliasing, the baseband filter bandwidth is automatically set to the
* widest available setting that is no more than 75% of the sample rate. This
* happens every time the sample rate is set. If you want to override the
* baseband filter selection, you must do so after setting the sample rate.
*/
int ADDCALL hackrf_set_sample_rate(hackrf_device* device, const double freq)
{
/* Use old fractional vendor request on old firmware. */
uint16_t usb_version = 0;
hackrf_usb_api_version_read(device, &usb_version);
if (usb_version < 0x0111) {
return hackrf_set_sample_rate_frac(device, freq);
}
/* Convert sample rate to 40.24 fixed-point. */
const uint64_t value = freq * (1 << 24);
const uint8_t bank = 1; /* RADIO_BANK_ACTIVE */
const uint8_t register_number = 6; /* RADIO_SAMPLE_RATE */
return hackrf_radio_write_register(device, bank, register_number, value);
}
int ADDCALL hackrf_set_amp_enable(hackrf_device* device, const uint8_t value)
{
int result;

1
host/libhackrf/src/hackrf.h
View File

@@ -1790,6 +1790,7 @@ extern ADDAPI int ADDCALL hackrf_set_freq_explicit(
* @param device device to configure
* @param freq_hz sample rate base frequency in Hz
* @param divider frequency divider. Must be in the range 1-31
* @deprecated This has been replaced by @ref hackrf_set_sample_rate
* @return @ref HACKRF_SUCCESS on success or @ref hackrf_error variant
* @ingroup configuration
*/