osmocom-sdr December 2016

osmocom-sdr@lists.osmocom.org

9 participants
9 discussions

by Krzysztof Halasa

Hello, it's my first mail on this list, so please forgive me if I do something wrong. I'm about to post a couple of patches for RTL drivers: 1. RTL-SDR: convert _lut to float[] to reduce size by a factor of 256. The _lut is being indexed by I + Q (16 bits = 65536 entries), however both samples can be processed independently, resulting in 8-bit LUT. Saves a bit of RAM and CPU cache. lib/rtl/rtl_source_c.cc | 19 ++++++------------- lib/rtl/rtl_source_c.h | 4 ++-- 2 files changed, 8 insertions(+), 15 deletions(-) 2. RTL-TCP: Convert to single class model The existing RTL TCP driver is quite different from its brother RTL_SDR. It's much more complicated, uses gr::blocks::deinterleave and gr::blocks::float_to_complex, and generally doesn't work correctly (e.g. https://github.com/csete/gqrx/issues/99 Spectrum is mirrored when filter or demodulator changes (rtl_tcp) #99) I've converted the RTL TCP driver to the model used by RTL_SDR, simplifying it in the process, and fixing the GQRX issue. lib/rtl_tcp/CMakeLists.txt | 1 - lib/rtl_tcp/rtl_tcp_source_c.cc | 352 ++++++++++++++++++++++++++++++++-------- lib/rtl_tcp/rtl_tcp_source_c.h | 32 +++- lib/rtl_tcp/rtl_tcp_source_f.cc | 327 ------------------------------------- lib/rtl_tcp/rtl_tcp_source_f.h | 125 -------------- 5 files changed, 309 insertions(+), 528 deletions(-) I'm also thinking about merging the code common to RTL-SDR and RTL-TCP, but this it's done yet. Comments? -- Krzysztof Halasa

8 years

Just Getting Started with the SDR Dongles.

by Martin McCormick

Here are some real beginner questions that I would like to have a better understanding of concerning SDR in general and the rtl dongles: I understand that the I and Q signals are both 8-bit numbers so each one can have 2^8 possible levels. Is the in-phase value related to the amplitude of the signal such that frequency variations within the pass band don't change it much? Is the Q or Quadrature value something that varies with whether or not the frequency is higher or lower than the center frequency set in to the device? I could imagine that if the Q value responds to changes in frequency that one could get the effect of a discriminator circuit. I bought a couple of the rtl dongles and tried out the rtl-fm program to receive local FM signals and it worked quite well. Finally, what determines the pass-band? It did seem to get smaller if I tried a 12,000 HZ sample rate. I also was surprised at how accurate the frequency is. Other than the fact that I am at the low end of the learning curve, I see all kinds of possibilities. Martin McCormick WB5AGZ

8 years, 5 months

[RFC PATCH] rtl-sdr: add support to change FIR coefficients

by Luigi Tarenga

Hello list, these days I was experimenting with the FIR filters. If my reasoning are correct there is rooms for improvement with some trade-off between bandwidth flatness and image aliasing. I'm not saying the default FIR is to trash but I think there can be specialized application that will benefit from a custom FIR. Even to just let more people test my theory I need support for FIR coefficient loading so even who can't program the driver but have lab test equipment can give me a feedback. I have prepared a patch for rtl-sdr and gr-osmosdr to load FIR coefficients with a device string like "rtl=0,fir=50:54:57:60:63:65:68:70:72:74:75:77:78:78:79:79" for a little discussion see here with some screenshot: https://www.reddit.com/r/RTLSDR/comments/5jqk5h/playing_with_rtl2832u_fir_f… I'm looking for feedback and once this patch get accepted (I hope so :) ) I will push the one for gr-osmosdr. best regards Luigi PS: I hope to not send another garbage patch.... Signed-off-by: Luigi Tarenga <luigi.tarenga(a)gmail.com> --- include/rtl-sdr.h | 9 +++++++++ src/librtlsdr.c | 6 ++++++ 2 files changed, 15 insertions(+) diff --git a/include/rtl-sdr.h b/include/rtl-sdr.h index fe64bea..74cd765 100644 --- a/include/rtl-sdr.h +++ b/include/rtl-sdr.h @@ -169,6 +169,15 @@ RTLSDR_API int rtlsdr_set_freq_correction(rtlsdr_dev_t *dev, int ppm); */ RTLSDR_API int rtlsdr_get_freq_correction(rtlsdr_dev_t *dev); +/*! + * Load and set FIR filter coefficients. + * + * \param dev the device handle given by rtlsdr_open() + * \param new_fir the vector of 16 integer FIR coefficients + * \return 0 on success + */ +RTLSDR_API int rtlsdr_load_fir_coefficients(rtlsdr_dev_t *dev, int *new_fir); + enum rtlsdr_tuner { RTLSDR_TUNER_UNKNOWN = 0, RTLSDR_TUNER_E4000, diff --git a/src/librtlsdr.c b/src/librtlsdr.c index 9b7ba52..4b7855f 100644 --- a/src/librtlsdr.c +++ b/src/librtlsdr.c @@ -613,6 +613,12 @@ int rtlsdr_set_fir(rtlsdr_dev_t *dev) return 0; } +int rtlsdr_load_fir_coefficients(rtlsdr_dev_t *dev, int *new_fir) +{ + memcpy(dev->fir, new_fir, sizeof(fir_default)); + return rtlsdr_set_fir(dev); +} + void rtlsdr_init_baseband(rtlsdr_dev_t *dev) { unsigned int i; -- 2.11.0

8 years, 6 months

[RFC PATCH] rtl-sdr: add support for independent gain settings

by Luigi Tarenga

hello list, with this patch I try to start adding support for independent gain setting to rtl-sdr. If this will go on (after review of course) I will be able to send a patch for gr-osmosdr to expose those controls to end user applications like gqrx. I see some users wish to experiment with manual tuning like it's possible to do on SDR# with airspy dongle that use R820T tuner. I see some users started their own tree to add this. There will be some complexity added but I think this can be masked with a proper patching of gr-osmosdr to no break compatibility with existing software and let users get the old control layout. In a future patch I wish to add: - single automatic gain control. I ask if it's ok to expose a function like rtlsdr_set_tuner_gain_mode() and internally recycle the function added by this patch but with a new *mode* parameter. - optimized gain for *max sensitivity* and *max linearity* like those found in airspy code. here I ask if is fine to expose gains as just integers instead of tenth of dB. best regards Luigi Signed-off-by: Luigi Tarenga <luigi.tarenga(a)gmail.com> --- include/rtl-sdr.h | 62 ++++++++++++++++++++++++++ include/tuner_r82xx.h | 3 ++ src/librtlsdr.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++--- src/tuner_r82xx.c | 53 +++++++++++++++++++++- 4 files changed, 230 insertions(+), 8 deletions(-) diff --git a/include/rtl-sdr.h b/include/rtl-sdr.h index fe64bea..2eec99c 100644 --- a/include/rtl-sdr.h +++ b/include/rtl-sdr.h @@ -216,6 +216,41 @@ RTLSDR_API int rtlsdr_get_tuner_gains(rtlsdr_dev_t *dev, int *gains); RTLSDR_API int rtlsdr_set_tuner_gain(rtlsdr_dev_t *dev, int gain); /*! + * Set the LNA gain for the device. + * + * Valid gain values for the R820T tuner are from 0 to 15. + * + * \param dev the device handle given by rtlsdr_open() + * \param gain between 0 and 15. + * \return 0 on success + */ +RTLSDR_API int rtlsdr_set_tuner_lna_gain(rtlsdr_dev_t *dev, int gain); + +/*! + * Set the Mixer gain for the device. + * Manual gain mode must be enabled for this to work. + * + * Valid gain values for the R820T tuner are from 0 to 15. + * + * \param dev the device handle given by rtlsdr_open() + * \param gain between 0 and 15. + * \return 0 on success + */ +RTLSDR_API int rtlsdr_set_tuner_mix_gain(rtlsdr_dev_t *dev, int gain); + +/*! + * Set the VGA gain for the device. + * Manual gain mode must be enabled for this to work. + * + * Valid gain values for the R820T tuner are from 0 to 15. + * + * \param dev the device handle given by rtlsdr_open() + * \param gain between 0 and 15. + * \return 0 on success + */ +RTLSDR_API int rtlsdr_set_tuner_vga_gain(rtlsdr_dev_t *dev, int gain); + +/*! * Set the bandwidth for the device. * * \param dev the device handle given by rtlsdr_open() @@ -233,6 +268,33 @@ RTLSDR_API int rtlsdr_set_tuner_bandwidth(rtlsdr_dev_t *dev, uint32_t bw); RTLSDR_API int rtlsdr_get_tuner_gain(rtlsdr_dev_t *dev); /*! + * Get actual LNA gain the device is configured to. + * The LNA gain must have been set with \ref rtlsdr_set_tuner_lna_gain function. + * + * \param dev the device handle given by rtlsdr_open() + * \return -1 on error, LNA gain register value (0 to 15 for R820T). + */ +RTLSDR_API int rtlsdr_get_tuner_lna_gain(rtlsdr_dev_t *dev); + +/*! + * Get actual Mixer gain the device is configured to. + * The Mixer gain must have been set with \ref rtlsdr_set_tuner_mix_gain function. + * + * \param dev the device handle given by rtlsdr_open() + * \return -1 on error, Mixer gain register value (0 to 15 for R820T). + */ +RTLSDR_API int rtlsdr_get_tuner_mix_gain(rtlsdr_dev_t *dev); + +/*! + * Get actual VGA gain the device is configured to. + * The VGA gain must have been set with \ref rtlsdr_set_tuner_vga_gain function. + * + * \param dev the device handle given by rtlsdr_open() + * \return -1 on error, VGA gain register value (0 to 15 for R820T). + */ +RTLSDR_API int rtlsdr_get_tuner_vga_gain(rtlsdr_dev_t *dev); + +/*! * Set the intermediate frequency gain for the device. * * \param dev the device handle given by rtlsdr_open() diff --git a/include/tuner_r82xx.h b/include/tuner_r82xx.h index f6c206a..3ddb9c6 100644 --- a/include/tuner_r82xx.h +++ b/include/tuner_r82xx.h @@ -115,6 +115,9 @@ int r82xx_standby(struct r82xx_priv *priv); int r82xx_init(struct r82xx_priv *priv); int r82xx_set_freq(struct r82xx_priv *priv, uint32_t freq); int r82xx_set_gain(struct r82xx_priv *priv, int set_manual_gain, int gain); +int r82xx_set_lna_gain(struct r82xx_priv *priv, int gain); +int r82xx_set_mix_gain(struct r82xx_priv *priv, int gain); +int r82xx_set_vga_gain(struct r82xx_priv *priv, int gain); int r82xx_set_bandwidth(struct r82xx_priv *priv, int bandwidth, uint32_t rate); #endif diff --git a/src/librtlsdr.c b/src/librtlsdr.c index 9b7ba52..10556a8 100644 --- a/src/librtlsdr.c +++ b/src/librtlsdr.c @@ -62,6 +62,9 @@ typedef struct rtlsdr_tuner_iface { int (*set_freq)(void *, uint32_t freq /* Hz */); int (*set_bw)(void *, int bw /* Hz */); int (*set_gain)(void *, int gain /* tenth dB */); + int (*set_lna_gain)(void *, int gain /* register value */); + int (*set_mix_gain)(void *, int gain /* register value */); + int (*set_vga_gain)(void *, int gain /* register value */); int (*set_if_gain)(void *, int stage, int gain /* tenth dB */); int (*set_gain_mode)(void *, int manual); } rtlsdr_tuner_iface_t; @@ -117,6 +120,9 @@ struct rtlsdr_dev { uint32_t offs_freq; /* Hz */ int corr; /* ppm */ int gain; /* tenth dB */ + int lna_gain; /* register value */ + int mix_gain; /* register value */ + int vga_gain; /* register value */ struct e4k_state e4k_s; struct r82xx_config r82xx_c; struct r82xx_priv r82xx_p; @@ -258,6 +264,18 @@ int r820t_set_gain(void *dev, int gain) { rtlsdr_dev_t* devt = (rtlsdr_dev_t*)dev; return r82xx_set_gain(&devt->r82xx_p, 1, gain); } +int r820t_set_lna_gain(void *dev, int gain) { + rtlsdr_dev_t* devt = (rtlsdr_dev_t*)dev; + return r82xx_set_lna_gain(&devt->r82xx_p, gain); +} +int r820t_set_mix_gain(void *dev, int gain) { + rtlsdr_dev_t* devt = (rtlsdr_dev_t*)dev; + return r82xx_set_mix_gain(&devt->r82xx_p, gain); +} +int r820t_set_vga_gain(void *dev, int gain) { + rtlsdr_dev_t* devt = (rtlsdr_dev_t*)dev; + return r82xx_set_vga_gain(&devt->r82xx_p, gain); +} int r820t_set_gain_mode(void *dev, int manual) { rtlsdr_dev_t* devt = (rtlsdr_dev_t*)dev; return r82xx_set_gain(&devt->r82xx_p, manual, 0); @@ -266,36 +284,37 @@ int r820t_set_gain_mode(void *dev, int manual) { /* definition order must match enum rtlsdr_tuner */ static rtlsdr_tuner_iface_t tuners[] = { { - NULL, NULL, NULL, NULL, NULL, NULL, NULL /* dummy for unknown tuners */ + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL /* dummy for unknown tuners */ }, { e4000_init, e4000_exit, - e4000_set_freq, e4000_set_bw, e4000_set_gain, e4000_set_if_gain, + e4000_set_freq, e4000_set_bw, e4000_set_gain, NULL, NULL, NULL, e4000_set_if_gain, e4000_set_gain_mode }, { _fc0012_init, fc0012_exit, - fc0012_set_freq, fc0012_set_bw, _fc0012_set_gain, NULL, + fc0012_set_freq, fc0012_set_bw, _fc0012_set_gain, NULL, NULL, NULL, NULL, fc0012_set_gain_mode }, { _fc0013_init, fc0013_exit, - fc0013_set_freq, fc0013_set_bw, _fc0013_set_gain, NULL, + fc0013_set_freq, fc0013_set_bw, _fc0013_set_gain, NULL, NULL, NULL, NULL, fc0013_set_gain_mode }, { fc2580_init, fc2580_exit, - _fc2580_set_freq, fc2580_set_bw, fc2580_set_gain, NULL, + _fc2580_set_freq, fc2580_set_bw, fc2580_set_gain, NULL, NULL, NULL, NULL, fc2580_set_gain_mode }, { r820t_init, r820t_exit, - r820t_set_freq, r820t_set_bw, r820t_set_gain, NULL, + r820t_set_freq, r820t_set_bw, r820t_set_gain, + r820t_set_lna_gain, r820t_set_mix_gain, r820t_set_vga_gain, NULL, r820t_set_gain_mode }, { r820t_init, r820t_exit, - r820t_set_freq, r820t_set_bw, r820t_set_gain, NULL, + r820t_set_freq, r820t_set_bw, r820t_set_gain, NULL, NULL, NULL, NULL, r820t_set_gain_mode }, }; @@ -1049,6 +1068,69 @@ int rtlsdr_set_tuner_gain(rtlsdr_dev_t *dev, int gain) return r; } +int rtlsdr_set_tuner_lna_gain(rtlsdr_dev_t *dev, int gain) +{ + int r = 0; + + if (!dev || !dev->tuner) + return -1; + + if (dev->tuner->set_lna_gain) { + rtlsdr_set_i2c_repeater(dev, 1); + r = dev->tuner->set_lna_gain((void *)dev, gain); + rtlsdr_set_i2c_repeater(dev, 0); + } + + if (!r) + dev->lna_gain = gain; + else + dev->lna_gain = 0; + + return r; +} + +int rtlsdr_set_tuner_mix_gain(rtlsdr_dev_t *dev, int gain) +{ + int r = 0; + + if (!dev || !dev->tuner) + return -1; + + if (dev->tuner->set_mix_gain) { + rtlsdr_set_i2c_repeater(dev, 1); + r = dev->tuner->set_mix_gain((void *)dev, gain); + rtlsdr_set_i2c_repeater(dev, 0); + } + + if (!r) + dev->mix_gain = gain; + else + dev->mix_gain = 0; + + return r; +} + +int rtlsdr_set_tuner_vga_gain(rtlsdr_dev_t *dev, int gain) +{ + int r = 0; + + if (!dev || !dev->tuner) + return -1; + + if (dev->tuner->set_vga_gain) { + rtlsdr_set_i2c_repeater(dev, 1); + r = dev->tuner->set_vga_gain((void *)dev, gain); + rtlsdr_set_i2c_repeater(dev, 0); + } + + if (!r) + dev->vga_gain = gain; + else + dev->vga_gain = 0; + + return r; +} + int rtlsdr_get_tuner_gain(rtlsdr_dev_t *dev) { if (!dev) @@ -1057,6 +1139,30 @@ int rtlsdr_get_tuner_gain(rtlsdr_dev_t *dev) return dev->gain; } +int rtlsdr_get_tuner_lna_gain(rtlsdr_dev_t *dev) +{ + if (!dev) + return -1; + + return dev->lna_gain; +} + +int rtlsdr_get_tuner_mix_gain(rtlsdr_dev_t *dev) +{ + if (!dev) + return -1; + + return dev->mix_gain; +} + +int rtlsdr_get_tuner_vga_gain(rtlsdr_dev_t *dev) +{ + if (!dev) + return -1; + + return dev->vga_gain; +} + int rtlsdr_set_tuner_if_gain(rtlsdr_dev_t *dev, int stage, int gain) { int r = 0; diff --git a/src/tuner_r82xx.c b/src/tuner_r82xx.c index f620238..64d412b 100644 --- a/src/tuner_r82xx.c +++ b/src/tuner_r82xx.c @@ -1018,7 +1018,7 @@ int r82xx_set_gain(struct r82xx_priv *priv, int set_manual_gain, int gain) if (rc < 0) return rc; - /* Mixer auto off */ + /* Mixer auto off */ rc = r82xx_write_reg_mask(priv, 0x07, 0, 0x10); if (rc < 0) return rc; @@ -1073,6 +1073,57 @@ int r82xx_set_gain(struct r82xx_priv *priv, int set_manual_gain, int gain) return 0; } +int r82xx_set_lna_gain(struct r82xx_priv *priv, int gain) +{ + int rc; + + /* LNA auto off */ + rc = r82xx_write_reg_mask(priv, 0x05, 0x10, 0x10); + if (rc < 0) + return rc; + + /* set LNA gain */ + rc = r82xx_write_reg_mask(priv, 0x05, (uint8_t) gain, 0x0f); + if (rc < 0) + return rc; + + return 0; +} + +int r82xx_set_mix_gain(struct r82xx_priv *priv, int gain) +{ + int rc; + + /* Mixer auto off */ + rc = r82xx_write_reg_mask(priv, 0x07, 0, 0x10); + if (rc < 0) + return rc; + + /* set Mixer gain */ + rc = r82xx_write_reg_mask(priv, 0x07, (uint8_t) gain, 0x0f); + if (rc < 0) + return rc; + + return 0; +} + +int r82xx_set_vga_gain(struct r82xx_priv *priv, int gain) +{ + int rc; + + /* VGA auto off */ + rc = r82xx_write_reg_mask(priv, 0x0c, 0, 0x10); + if (rc < 0) + return rc; + + /* set VGA gain */ + rc = r82xx_write_reg_mask(priv, 0x0c, (uint8_t) gain, 0x0f); + if (rc < 0) + return rc; + + return 0; +} + /* Bandwidth contribution by low-pass filter. */ static const int r82xx_if_low_pass_bw_table[] = { 1700000, 1600000, 1550000, 1450000, 1200000, 900000, 700000, 550000, 450000, 350000 -- 2.11.0

8 years, 6 months

[PATCH] gr-osmosdr: add set_bandwidth and independent gains via extended_mode

by Luigi Tarenga

Hello list, the following patch rely on librtlsdr fork on github. I would like to receive feedback on what is the best option to backport the commit: https://github.com/librtlsdr/librtlsdr/commit/25d0e8e6737b93b3564ad04d0fd2c… or alternatively put a preprocessor switch in this patch in order to enable build against 2 different rtlsdr driver. regards Luigi --- a/lib/rtl/rtl_source_c.cc +++ b/lib/rtl/rtl_source_c.cc @@ -88,7 +88,11 @@ rtl_source_c::rtl_source_c (const std::string &args) _no_tuner(false), _auto_gain(false), _if_gain(0), - _skipped(0) + _lna_gain(0), + _mix_gain(0), + _vga_gain(0), + _skipped(0), + _extended_mode(0) { int ret; int index; @@ -150,6 +154,9 @@ rtl_source_c::rtl_source_c (const std::string &args) if (dict.count("offset_tune")) offset_tune = boost::lexical_cast< unsigned int >( dict["offset_tune"] ); + if (dict.count("extended_mode")) + _extended_mode = boost::lexical_cast< bool >( dict["extended_mode"] ); + _buf_num = _buf_len = _buf_head = _buf_used = _buf_offset = 0; if (dict.count("buffers")) @@ -528,6 +535,13 @@ std::vector<std::string> rtl_source_c::get_gain_names( size_t chan ) if ( rtlsdr_get_tuner_type(_dev) == RTLSDR_TUNER_E4000 ) { names += "IF"; } + + if ( rtlsdr_get_tuner_type(_dev) == RTLSDR_TUNER_R820T ) { + if ( _extended_mode ) { + names += "MIX"; + names += "IF"; + } + } } return names; @@ -553,14 +567,31 @@ osmosdr::gain_range_t rtl_source_c::get_gain_range( size_t chan ) osmosdr::gain_range_t rtl_source_c::get_gain_range( const std::string & name, size_t chan ) { - if ( "IF" == name ) { - if ( _dev ) { - if ( rtlsdr_get_tuner_type(_dev) == RTLSDR_TUNER_E4000 ) { - return osmosdr::gain_range_t(3, 56, 1); - } else { + + if ( _dev ) { + if ( rtlsdr_get_tuner_type(_dev) == RTLSDR_TUNER_R820T ) { + if ( _extended_mode ) { + if ( "LNA" == name ) { + return osmosdr::gain_range_t( 0, 15, 1 ); + } + + if ( "MIX" == name ) { + return osmosdr::gain_range_t( 0, 15, 1 ); + } + + if ( "IF" == name ) { + return osmosdr::gain_range_t( 0, 15, 1 ); + } + return osmosdr::gain_range_t(); } } + + if ( rtlsdr_get_tuner_type(_dev) == RTLSDR_TUNER_E4000 ) { + if ( "IF" == name ) { + return osmosdr::gain_range_t(3, 56, 1); + } + } } return get_gain_range( chan ); @@ -584,21 +615,86 @@ bool rtl_source_c::get_gain_mode( size_t chan ) return _auto_gain; } +double rtl_source_c::set_bandwidth( double bandwidth, size_t chan ) +{ + if (_dev) { + return (double)rtlsdr_set_tuner_bandwidth( _dev, (uint32_t)bandwidth); + } + + return 0; +} + double rtl_source_c::set_gain( double gain, size_t chan ) { osmosdr::gain_range_t rf_gains = rtl_source_c::get_gain_range( chan ); - if (_dev) { + if ( _dev ) { rtlsdr_set_tuner_gain( _dev, int(rf_gains.clip(gain) * 10.0) ); } return get_gain( chan ); } +double rtl_source_c::set_lna_gain( double gain, size_t chan ) +{ + osmosdr::gain_range_t gains = rtl_source_c::get_gain_range( "LNA", chan ); + + if ( _dev ) { + _lna_gain = gains.clip( gain ); + return rtlsdr_set_tuner_gain_ext( _dev, int(_lna_gain), int(_mix_gain), int(_vga_gain) ); + } + + return _lna_gain; +} + +double rtl_source_c::set_mix_gain( double gain, size_t chan ) +{ + osmosdr::gain_range_t gains = rtl_source_c::get_gain_range( "MIX", chan ); + + if ( _dev ) { + _mix_gain = gains.clip( gain ); + return rtlsdr_set_tuner_gain_ext( _dev, int(_lna_gain), int(_mix_gain), int(_vga_gain) ); + } + + return _mix_gain; +} + +double rtl_source_c::set_vga_gain( double gain, size_t chan ) +{ + osmosdr::gain_range_t gains = rtl_source_c::get_gain_range( "IF", chan ); + + if ( _dev ) { + _vga_gain = gains.clip( gain ); + return rtlsdr_set_tuner_gain_ext( _dev, int(_lna_gain), int(_mix_gain), int(_vga_gain) ); + } + + return _vga_gain; +} + double rtl_source_c::set_gain( double gain, const std::string & name, size_t chan) { - if ( "IF" == name ) { - return set_if_gain( gain, chan ); + if ( _dev ) { + if ( rtlsdr_get_tuner_type(_dev) == RTLSDR_TUNER_R820T ) { + if ( _extended_mode ) { + if ( "LNA" == name ) { + return set_lna_gain( gain, chan ); + } + + if ( "MIX" == name ) { + return set_mix_gain( gain, chan ); + } + + if ( "IF" == name ) { + return set_vga_gain( gain, chan ); + } + } + } + + if ( rtlsdr_get_tuner_type(_dev) == RTLSDR_TUNER_E4000 ) { + if ( "IF" == name ) { + return set_if_gain( gain, chan ); + } + } } return set_gain( gain, chan ); @@ -614,6 +710,20 @@ double rtl_source_c::get_gain( size_t chan ) double rtl_source_c::get_gain( const std::string & name, size_t chan ) { + if ( _extended_mode ) { + if ( "LNA" == name ) { + return _lna_gain; + } + + if ( "MIX" == name ) { + return _mix_gain; + } + + if ( "IF" == name ) { + return _vga_gain; + } + } + if ( "IF" == name ) { return _if_gain; } diff --git a/lib/rtl/rtl_source_c.h b/lib/rtl/rtl_source_c.h index 76de400..bb20e5c 100644 --- a/lib/rtl/rtl_source_c.h +++ b/lib/rtl/rtl_source_c.h @@ -101,12 +101,16 @@ public: osmosdr::gain_range_t get_gain_range( const std::string & name, size_t chan = 0 ); bool set_gain_mode( bool automatic, size_t chan = 0 ); bool get_gain_mode( size_t chan = 0 ); + double set_bandwidth( double bandwidth, size_t chan = 0 ); double set_gain( double gain, size_t chan = 0 ); double set_gain( double gain, const std::string & name, size_t chan = 0 ); double get_gain( size_t chan = 0 ); double get_gain( const std::string & name, size_t chan = 0 ); double set_if_gain( double gain, size_t chan = 0 ); + double set_lna_gain( double gain, size_t chan = 0 ); + double set_mix_gain( double gain, size_t chan = 0 ); + double set_vga_gain( double gain, size_t chan = 0 ); std::vector< std::string > get_antennas( size_t chan = 0 ); std::string set_antenna( const std::string & antenna, size_t chan = 0 ); @@ -141,7 +145,12 @@ private: bool _no_tuner; bool _auto_gain; double _if_gain; + double _lna_gain; + double _mix_gain; + double _vga_gain; unsigned int _skipped; + + bool _extended_mode; }; #endif /* INCLUDED_RTLSDR_SOURCE_C_H */

8 years, 6 months

minor bug in gr-osmosdr's gnuradio-osmosdr.pc.in?

by Cinaed Simson

The include directory in gnuradio-osmosdr.pc.in includedir=${prefix}/@GR_INCLUDE_DIR@ ends up pointing to includedir=${prefix}/include when the file gnuradio-osmosdr.pc is installed in $prefix/lib/pkgconfig. But it appears the include files for gnuradio-osmosdr.pc are installed in includedir=${prefix}/include/osmosdr When I attempted to build software using gr-osmosdr outside of the gnuradio tree, I had to add the subdirectory ./osmosdr to the include path in gnuradio-osmosdr.pc otherwise cmake complained it couldn't find the gnuradio-osmosdr includes. Since it appears to build gr-osmosdr without the subdirectory osmosdr added to the include path, I'm not really sure what's going on. -- Cinaed

8 years, 6 months

compiling rtl-sdr on win10 with qtcreator

by Luigi Tarenga

hello, I'm trying to build rtl-sdr on win10. I choosed to use mingw and qtcreator. I installed: cmake 3.7.1 qtcreate 4.2.0 mingw32 (to build libusb) I compiled libusb with mingw32 and automake and installed in Desktop\libusb\. Now I'm trying to find out how to generate make files for rtl-sdr passing the folder where I installed libusb (library and header) in qtcreator. I don't understand if I have to modify CMakeLists.txt or there is some gui to enter the correct parameter. I have even to find out if I have to explicit the variable LIBUSB_PKG_INCLUDE_DIRS or what... running cmake (from qtcreator) returns with error that I'm missing libusb and libpthread. I think that once I can solve the problem for libusb I will be able to solve even the one of libpthread. can someone help me in this phase? thanks Luigi

8 years, 6 months

RFC: OsmoDevCon 2017 planning

by Harald Welte

Dear Osmocom Community, [please respect the Reply-To and post all follow-up discussion to this to openbsc(a)lists.osmocom.org, so we avoid having long threads cross-posted to several mailing lists.] >From 2012 to 2016 we were running a series of small, invitation-only Osmocom Developer Conferences. Access was intentionally restricted to those community members who have demonstrated an existing track record of contribution to any of the projects under the Osmocom umbrella. This format of a small, tightly knit group of about 20 people has been successful over the years, and I have received a lot of positive feedback from past participants. On the other hand, the Osmocom project has grown in scope and diversity, and some of those projects don't have all that much relationship to each other - except being started by people from within the same group. There's the cellular communications (GSM/GPRS/EDGE/UMTS and hopefully at some point LTE) protocols which is attracting a lot of professional users. And then there's pure community projects like rtl-sdr, OsmocomBB, OsmocomGMR and many other efforts. Particularly the cellular infrastructure projects (OsmoBTS, OsmoPCU, OsmoBTS, OsmoNITB, OsmoSGSN, OpenGGSN, OsmoIuh & co) are somehow "standing out" of the othe projects in the context of having a wider user bsae, and in that user base also primarily commercial users. So I'd like to start a discussion on how to possibly change the event format to accomodate the various interests and parties. I definitely don't want to loose the "annual meeting of old friends" atmosphere, while at the same time also opening up to other interested parties. One idea would be to keep OsmoDevCon as-is and have a separate event where non-contributing/developing users / sysadmins / system integrators could also be attending. Another idea would be to split into a 'user day' and 'developer days' format. This is something the netfilter developer workshops have been using for many years, and from my limited insight quite successfully so. The "user day" is more like a traditional tech conference, with a large auditorium and talks oriented towards users / sysadmins / integrators of the software. The "developer days" are the invitation-only part, for known contributing developers only, similar to what we have at OsmoDevCon. Having both events (or both parts of an event) back-to-back has the advantage that a large number of potential speakers for the 'user day' are already present, and they don't have to travel yet another time. One could even structure it further and say we have one user day, one public 'Osmocom cellular developer day' and then the closed 'OsmoDevCon classic', maybe reduced from 4 days to 3 or even 2 days only? What is the general opinion about this? Are there people lurking on this list who would be interested in attending a public 'user day' or even 'developer day' about the Osmocom cellular projects, with presentations and workshops around topics such as running Osmocom based cellular networks? In terms of when/where, I would suggest to keep the tradition of April in Berlin/Germany. But I'm of course very happy if somebody wants to host it some place else... Regards, and looking forward to meeting you [again] in 2017, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

8 years, 6 months

Example of Setting Auto Gain

by john

Hello, I am not sure how to set auto gain on a RTL dongle. I ran across this which I think should be what I need: http://cgit.osmocom.org/gr-osmosdr/tree/grc/gen_osmosdr_blocks.py From that page: |<param> <name>Ch$(n): Gain Mode</name> <key>gain_mode$(n)</key> <value>False</value> <type>bool</type> <hide>\#if \$nchan() > $n then 'none' else 'all'#</hide> <option> <name>Manual</name> <key>False</key> </option> <option> <name>Automatic</name> <key>True</key> </option> </param> | However it is not clear what I need to pass to make auto gain happen. Thanks, John

8 years, 6 months

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osmocom-sdr December 2016