/* * rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver * Copyright (C) 2012 by Steve Markgraf * Copyright (C) 2012 by Dimitri Stolnikov * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifndef __RTL_SDR_H #define __RTL_SDR_H #ifdef __cplusplus extern "C" { #endif #include #include typedef struct rtlsdr_dev rtlsdr_dev_t; RTLSDR_API uint32_t rtlsdr_get_device_count(void); RTLSDR_API const char* rtlsdr_get_device_name(uint32_t index); RTLSDR_API int rtlsdr_open(rtlsdr_dev_t **dev, uint32_t index); RTLSDR_API int rtlsdr_close(rtlsdr_dev_t *dev); /* configuration functions */ /*! * Set crystal oscillator frequencies used for the RTL2832 and the tuner IC. * * 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. * * NOTE: Call this function only if you know what you are doing. * * \param dev the device handle given by rtlsdr_open() * \param rtl_freq frequency value used to clock the RTL2832 in Hz * \param tuner_freq frequency value used to clock the tuner IC in Hz * \return 0 on success */ RTLSDR_API int rtlsdr_set_xtal_freq(rtlsdr_dev_t *dev, uint32_t rtl_freq, uint32_t tuner_freq); /*! * Get crystal oscillator frequencies used for the RTL2832 and the tuner IC. * * Usually both ICs use the same clock. * * \param dev the device handle given by rtlsdr_open() * \param rtl_freq frequency value used to clock the RTL2832 in Hz * \param tuner_freq frequency value used to clock the tuner IC in Hz * \return 0 on success */ RTLSDR_API int rtlsdr_get_xtal_freq(rtlsdr_dev_t *dev, uint32_t *rtl_freq, uint32_t *tuner_freq); RTLSDR_API int rtlsdr_set_center_freq(rtlsdr_dev_t *dev, uint32_t freq); /*! * Get actual frequency the device is tuned to. * * \param dev the device handle given by rtlsdr_open() * \return 0 on error, frequency in Hz otherwise */ RTLSDR_API uint32_t rtlsdr_get_center_freq(rtlsdr_dev_t *dev); RTLSDR_API int rtlsdr_set_freq_correction(rtlsdr_dev_t *dev, int ppm); RTLSDR_API int rtlsdr_get_freq_correction(rtlsdr_dev_t *dev); /*! * Set the gain for the device. * Manual gain mode must be enabled for this to work. * * Valid gain values (in tenths of a dB) for the E4000 tuner: * -10, 15, 40, 65, 90, 115, 140, 165, 190, * 215, 240, 290, 340, 420, 430, 450, 470, 490 * * \param dev the device handle given by rtlsdr_open() * \param gain in tenths of a dB, 115 means 11.5 dB. * \return 0 on success */ RTLSDR_API int rtlsdr_set_tuner_gain(rtlsdr_dev_t *dev, int gain); /*! * Get actual gain the device is configured to. * * \param dev the device handle given by rtlsdr_open() * \return < 0 on error, gain in tenths of a dB, 115 means 11.5 dB. */ RTLSDR_API int rtlsdr_get_tuner_gain(rtlsdr_dev_t *dev); /*! * Set the gain mode (automatic/manual) for the device. * Manual gain mode must be enabled for the gain setter function to work. * * \param dev the device handle given by rtlsdr_open() * \param manual gain mode, 1 means manual gain mode shall be enabled. * \return 0 on success */ RTLSDR_API int rtlsdr_set_tuner_gain_mode(rtlsdr_dev_t *dev, int manual); /* this will select the baseband filters according to the requested sample rate */ RTLSDR_API int rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t rate); /*! * Get actual sample rate the device is configured to. * * \param dev the device handle given by rtlsdr_open() * \return 0 on error, sample rate in Hz otherwise */ RTLSDR_API uint32_t rtlsdr_get_sample_rate(rtlsdr_dev_t *dev); /* streaming functions */ RTLSDR_API int rtlsdr_reset_buffer(rtlsdr_dev_t *dev); RTLSDR_API int rtlsdr_read_sync(rtlsdr_dev_t *dev, void *buf, int len, int *n_read); typedef void(*rtlsdr_read_async_cb_t)(unsigned char *buf, uint32_t len, void *ctx); /*! * Read samples from the device asynchronously. This function will block until * it is being canceled using rtlsdr_cancel_async() * * NOTE: This function is deprecated and is subject for removal. * * \param dev the device handle given by rtlsdr_open() * \param cb callback function to return received samples * \param ctx user specific context to pass via the callback function * \return 0 on success */ RTLSDR_API int rtlsdr_wait_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx); /*! * Read samples from the device asynchronously. This function will block until * it is being canceled using rtlsdr_cancel_async() * * \param dev the device handle given by rtlsdr_open() * \param cb callback function to return received samples * \param ctx user specific context to pass via the callback function * \param buf_num optional buffer count, buf_num * buf_len = overall buffer size * set to 0 for default buffer count (32) * \param buf_len optional buffer length, must be multiple of 512, * set to 0 for default buffer length (16 * 32 * 512) * \return 0 on success */ RTLSDR_API int rtlsdr_read_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx, uint32_t buf_num, uint32_t buf_len); /*! * Cancel all pending asynchronous operations on the device. * * \param dev the device handle given by rtlsdr_open() * \return 0 on success */ RTLSDR_API int rtlsdr_cancel_async(rtlsdr_dev_t *dev); #ifdef __cplusplus } #endif #endif /* __RTL_SDR_H */