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lib: Use GPIO P0 to toggle an (optional) bias-t

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At least one distributor of rtl-sdr dongles (rtl-sdr.com) added
a bias-t to their dongles which could be toggled via GPIO P0 of the
RTL2832U chip.

source: http://www.rtl-sdr.com/rtl-sdr-blog-v-3-dongles-user-guide/

Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Lucas Teske 2016-08-17 10:14:57 -03:00 committed by Steve Markgraf
parent ba64a7459a
commit 2be1612e60
2 changed files with 20 additions and 0 deletions
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9
include/rtl-sdr.h
View File

@ -380,6 +380,15 @@ RTLSDR_API int rtlsdr_read_async(rtlsdr_dev_t *dev,
*/ */
RTLSDR_API int rtlsdr_cancel_async(rtlsdr_dev_t *dev); RTLSDR_API int rtlsdr_cancel_async(rtlsdr_dev_t *dev);
/*!
* Enable or disable the bias tee on GPIO PIN 0.
*
* \param dev the device handle given by rtlsdr_open()
* \param on 1 for Bias T on. 0 for Bias T off.
* \return -1 if device is not initialized. 0 otherwise.
*/
RTLSDR_API int rtlsdr_set_bias_tee(rtlsdr_dev_t *dev, int on);
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif

11
src/librtlsdr.c
View File

@ -1937,3 +1937,14 @@ int rtlsdr_i2c_read_fn(void *dev, uint8_t addr, uint8_t *buf, int len)
return -1; return -1;
} }
int rtlsdr_set_bias_tee(rtlsdr_dev_t *dev, int on)
{
if (!dev)
return -1;
rtlsdr_set_gpio_output(dev, 0);
rtlsdr_set_gpio_bit(dev, 0, on);
return 0;
}