diff options
| author | Steve Markgraf <steve@steve-m.de> | 2012-07-07 20:59:48 +0200 |
|---|---|---|
| committer | Steve Markgraf <steve@steve-m.de> | 2012-07-07 21:06:38 +0200 |
| commit | f3cf83e3d7cc86218a1d7f6f4ed7ae3ad46f2105 (patch) | |
| tree | 78804729c750332f1c109dca60912cc479995e59 | |
| parent | 98d1b864b6dc40131808280df1bf0db149cba942 (diff) | |
disable DAGC by default, add control function
This adds rtlsdr_set_agc_mode() to enable/disable it.
Thanks to Leif Asbrink for finding this setting.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
| -rw-r--r-- | include/rtl-sdr.h | 9 | ||||
| -rw-r--r-- | src/librtlsdr.c | 15 |
2 files changed, 21 insertions, 3 deletions
diff --git a/include/rtl-sdr.h b/include/rtl-sdr.h index a7a3ee9..7de8455 100644 --- a/include/rtl-sdr.h +++ b/include/rtl-sdr.h @@ -206,6 +206,15 @@ RTLSDR_API uint32_t rtlsdr_get_sample_rate(rtlsdr_dev_t *dev); */ RTLSDR_API int rtlsdr_set_testmode(rtlsdr_dev_t *dev, int on); +/*! + * Enable or disable the internal digital AGC of the RTL2832. + * + * \param dev the device handle given by rtlsdr_open() + * \param digital AGC mode, 1 means enabled, 0 disabled + * \return 0 on success + */ +RTLSDR_API int rtlsdr_set_agc_mode(rtlsdr_dev_t *dev, int on); + /* streaming functions */ RTLSDR_API int rtlsdr_reset_buffer(rtlsdr_dev_t *dev); diff --git a/src/librtlsdr.c b/src/librtlsdr.c index adb9530..0853767 100644 --- a/src/librtlsdr.c +++ b/src/librtlsdr.c @@ -485,12 +485,13 @@ void rtlsdr_init_baseband(rtlsdr_dev_t *dev) for (i = 0; i < sizeof (fir_coeff); i++) rtlsdr_demod_write_reg(dev, 1, 0x1c + i, fir_coeff[i], 1); - rtlsdr_demod_write_reg(dev, 0, 0x19, 0x25, 1); + /* enable SDR mode, disable DAGC (bit 5) */ + rtlsdr_demod_write_reg(dev, 0, 0x19, 0x05, 1); /* init FSM state-holding register */ rtlsdr_demod_write_reg(dev, 1, 0x93, 0xf0, 1); - /* disable AGC (en_dagc, bit 0) */ + /* disable AGC (en_dagc, bit 0) (this seems to have no effect) */ rtlsdr_demod_write_reg(dev, 1, 0x11, 0x00, 1); /* disable PID filter (enable_PID = 0) */ @@ -842,7 +843,15 @@ int rtlsdr_set_testmode(rtlsdr_dev_t *dev, int on) if (!dev) return -1; - return rtlsdr_demod_write_reg(dev, 0, 0x19, on ? 0x23 : 0x25 , 1); + return rtlsdr_demod_write_reg(dev, 0, 0x19, on ? 0x03 : 0x05, 1); +} + +int rtlsdr_set_agc_mode(rtlsdr_dev_t *dev, int on) +{ + if (!dev) + return -1; + + return rtlsdr_demod_write_reg(dev, 0, 0x19, on ? 0x25 : 0x05, 1); } static rtlsdr_dongle_t *find_known_device(uint16_t vid, uint16_t pid) |