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https://github.com/rtlsdrblog/rtl-sdr-blog.git
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f9b5d7b0a6
by using this approach both, the tuning frequency and the sample rate should be corrected at the same time.
284 lines
9.0 KiB
C
284 lines
9.0 KiB
C
/*
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* rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
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* Copyright (C) 2012 by Steve Markgraf <steve@steve-m.de>
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* Copyright (C) 2012 by Dimitri Stolnikov <horiz0n@gmx.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __RTL_SDR_H
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#define __RTL_SDR_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <rtl-sdr_export.h>
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typedef struct rtlsdr_dev rtlsdr_dev_t;
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RTLSDR_API uint32_t rtlsdr_get_device_count(void);
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RTLSDR_API const char* rtlsdr_get_device_name(uint32_t index);
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/*!
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* Get USB device strings.
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*
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* NOTE: The string arguments must provide space for up to 256 bytes.
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*
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* \param index the device index
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* \param manufact manufacturer name, may be NULL
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* \param product product name, may be NULL
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* \param serial serial number, may be NULL
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_get_device_usb_strings(uint32_t index,
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char *manufact,
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char *product,
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char *serial);
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RTLSDR_API int rtlsdr_open(rtlsdr_dev_t **dev, uint32_t index);
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RTLSDR_API int rtlsdr_close(rtlsdr_dev_t *dev);
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/* configuration functions */
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/*!
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* Set crystal oscillator frequencies used for the RTL2832 and the tuner IC.
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*
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* Usually both ICs use the same clock. Changing the clock may make sense if
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* you are applying an external clock to the tuner or to compensate the
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* frequency (and samplerate) error caused by the original (cheap) crystal.
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*
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* NOTE: Call this function only if you fully understand the implications.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param rtl_freq frequency value used to clock the RTL2832 in Hz
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* \param tuner_freq frequency value used to clock the tuner IC in Hz
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_set_xtal_freq(rtlsdr_dev_t *dev, uint32_t rtl_freq,
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uint32_t tuner_freq);
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/*!
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* Get crystal oscillator frequencies used for the RTL2832 and the tuner IC.
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*
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* Usually both ICs use the same clock.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param rtl_freq frequency value used to clock the RTL2832 in Hz
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* \param tuner_freq frequency value used to clock the tuner IC in Hz
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_get_xtal_freq(rtlsdr_dev_t *dev, uint32_t *rtl_freq,
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uint32_t *tuner_freq);
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/*!
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* Get USB device strings.
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*
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* NOTE: The string arguments must provide space for up to 256 bytes.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param manufact manufacturer name, may be NULL
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* \param product product name, may be NULL
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* \param serial serial number, may be NULL
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_get_usb_strings(rtlsdr_dev_t *dev, char *manufact,
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char *product, char *serial);
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RTLSDR_API int rtlsdr_set_center_freq(rtlsdr_dev_t *dev, uint32_t freq);
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/*!
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* Get actual frequency the device is tuned to.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \return 0 on error, frequency in Hz otherwise
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*/
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RTLSDR_API uint32_t rtlsdr_get_center_freq(rtlsdr_dev_t *dev);
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/*!
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* Set the frequency correction value for the device.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param ppm correction value in parts per million (ppm)
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_set_freq_correction(rtlsdr_dev_t *dev, int ppm);
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/*!
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* Get actual frequency correction value of the device.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \return correction value in parts per million (ppm)
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*/
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RTLSDR_API int rtlsdr_get_freq_correction(rtlsdr_dev_t *dev);
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enum rtlsdr_tuner {
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RTLSDR_TUNER_UNKNOWN = 0,
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RTLSDR_TUNER_E4000,
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RTLSDR_TUNER_FC0012,
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RTLSDR_TUNER_FC0013,
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RTLSDR_TUNER_FC2580
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};
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/*!
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* Get the tuner type.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \return <= 0 on error, tuner type otherwise
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*/
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RTLSDR_API enum rtlsdr_tuner rtlsdr_get_tuner_type(rtlsdr_dev_t *dev);
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/*!
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* Get a list of gains supported by the tuner.
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*
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* NOTE: The gains argument must be preallocated by the caller. If NULL is
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* being given instead, the number of available gain values will be returned.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param gains array of gain values. In tenths of a dB, 115 means 11.5 dB.
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* \return <= 0 on error, number of available (returned) gain values otherwise
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*/
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RTLSDR_API int rtlsdr_get_tuner_gains(rtlsdr_dev_t *dev, int *gains);
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/*!
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* Set the gain for the device.
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* Manual gain mode must be enabled for this to work.
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*
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* Valid gain values (in tenths of a dB) for the E4000 tuner:
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* -10, 15, 40, 65, 90, 115, 140, 165, 190,
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* 215, 240, 290, 340, 420, 430, 450, 470, 490
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*
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* Valid gain values may be queried with \ref rtlsdr_get_tuner_gains function.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param gain in tenths of a dB, 115 means 11.5 dB.
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_set_tuner_gain(rtlsdr_dev_t *dev, int gain);
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/*!
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* Get actual gain the device is configured to.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \return 0 on error, gain in tenths of a dB, 115 means 11.5 dB.
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*/
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RTLSDR_API int rtlsdr_get_tuner_gain(rtlsdr_dev_t *dev);
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/*!
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* Set the intermediate frequency gain for the device.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param stage intermediate frequency gain stage number (1 to 6 for E4000)
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* \param gain in tenths of a dB, -30 means -3.0 dB.
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_set_tuner_if_gain(rtlsdr_dev_t *dev, int stage, int gain);
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/*!
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* Set the gain mode (automatic/manual) for the device.
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* Manual gain mode must be enabled for the gain setter function to work.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param manual gain mode, 1 means manual gain mode shall be enabled.
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_set_tuner_gain_mode(rtlsdr_dev_t *dev, int manual);
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/* this will select the baseband filters according to the requested sample rate */
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RTLSDR_API int rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t rate);
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/*!
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* Get actual sample rate the device is configured to.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \return 0 on error, sample rate in Hz otherwise
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*/
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RTLSDR_API uint32_t rtlsdr_get_sample_rate(rtlsdr_dev_t *dev);
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/*!
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* Enable test mode that returns an 8 bit counter instead of the samples.
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* The counter is generated inside the RTL2832.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param test mode, 1 means enabled, 0 disabled
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_set_testmode(rtlsdr_dev_t *dev, int on);
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/*!
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* Enable or disable the internal digital AGC of the RTL2832.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param digital AGC mode, 1 means enabled, 0 disabled
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_set_agc_mode(rtlsdr_dev_t *dev, int on);
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/* streaming functions */
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RTLSDR_API int rtlsdr_reset_buffer(rtlsdr_dev_t *dev);
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RTLSDR_API int rtlsdr_read_sync(rtlsdr_dev_t *dev, void *buf, int len, int *n_read);
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typedef void(*rtlsdr_read_async_cb_t)(unsigned char *buf, uint32_t len, void *ctx);
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/*!
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* Read samples from the device asynchronously. This function will block until
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* it is being canceled using rtlsdr_cancel_async()
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*
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* NOTE: This function is deprecated and is subject for removal.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param cb callback function to return received samples
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* \param ctx user specific context to pass via the callback function
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_wait_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx);
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/*!
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* Read samples from the device asynchronously. This function will block until
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* it is being canceled using rtlsdr_cancel_async()
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*
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* \param dev the device handle given by rtlsdr_open()
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* \param cb callback function to return received samples
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* \param ctx user specific context to pass via the callback function
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* \param buf_num optional buffer count, buf_num * buf_len = overall buffer size
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* set to 0 for default buffer count (32)
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* \param buf_len optional buffer length, must be multiple of 512,
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* set to 0 for default buffer length (16 * 32 * 512)
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_read_async(rtlsdr_dev_t *dev,
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rtlsdr_read_async_cb_t cb,
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void *ctx,
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uint32_t buf_num,
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uint32_t buf_len);
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/*!
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* Cancel all pending asynchronous operations on the device.
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*
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* \param dev the device handle given by rtlsdr_open()
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* \return 0 on success
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*/
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RTLSDR_API int rtlsdr_cancel_async(rtlsdr_dev_t *dev);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __RTL_SDR_H */
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