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apply frequency correction value on the xtal clock directly

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by using this approach both, the tuning frequency and the sample rate
should be corrected at the same time.
This commit is contained in:
Dimitri Stolnikov
2012-07-08 15:52:59 +02:00
parent 7dc15d9fd7
commit f9b5d7b0a6
2 changed files with 59 additions and 29 deletions
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17
include/rtl-sdr.h
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@ -60,9 +60,9 @@ RTLSDR_API int rtlsdr_close(rtlsdr_dev_t *dev);
*
* Usually both ICs use the same clock. Changing the clock may make sense if
* you are applying an external clock to the tuner or to compensate the
* frequency (and samplerate) error caused by the original cheap crystal.
* frequency (and samplerate) error caused by the original (cheap) crystal.
*
* NOTE: Call this function only if you know what you are doing.
* NOTE: Call this function only if you fully understand the implications.
*
* \param dev the device handle given by rtlsdr_open()
* \param rtl_freq frequency value used to clock the RTL2832 in Hz
@ -109,8 +109,21 @@ RTLSDR_API int rtlsdr_set_center_freq(rtlsdr_dev_t *dev, uint32_t freq);
*/
RTLSDR_API uint32_t rtlsdr_get_center_freq(rtlsdr_dev_t *dev);
/*!
* Set the frequency correction value for the device.
*
* \param dev the device handle given by rtlsdr_open()
* \param ppm correction value in parts per million (ppm)
* \return 0 on success
*/
RTLSDR_API int rtlsdr_set_freq_correction(rtlsdr_dev_t *dev, int ppm);
/*!
* Get actual frequency correction value of the device.
*
* \param dev the device handle given by rtlsdr_open()
* \return correction value in parts per million (ppm)
*/
RTLSDR_API int rtlsdr_get_freq_correction(rtlsdr_dev_t *dev);
enum rtlsdr_tuner {