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David Kozub zub at linux.fjfi.cvut.czOn Sun, 4 Feb 2018, David Basden wrote: > This patch fixes a regression of rtl-sdr dongles with the FC00012 tuner. > > The code to switch on the FC00012 tuner by pulling it's ~RESET line > low ended up with an off-by-one error in a refactor a long time ago, > > The FC00012 only continued to work by accident as a different bug in > rtlsdr_set_gpio_output had a side-effect of pulling low the FC00012's > ~RESET line > > When the rtl_set_gpio_output bug was fixed in ba64a7459a43 the side- > effect also went away, leaving the FC00012 tuner in reset, and failing > to be detected (or indeed work at all). > > This patch fixes the original off-by-one error. It's been tested > on an FC00012 in a GTek T803 from both warm and cold starts, but needs testing on the FC2580 as both the FC00012 and FC2580 are brought out of reset by a GPIO off the RTL (at least in some > designs). If the FC2580 actually uses a different pin, this code will also break. (I'm only going from vague memory that the FC2580 used the same pin.) Hi David, I ran into the same issue and already submitted a patch http://lists.osmocom.org/pipermail/osmocom-sdr/2017-November/001630.html but it seems nobody was interested in integrating it. I wasn't the first to run into this either: http://lists.osmocom.org/pipermail/osmocom-sdr/2017-October/001617.html I see we reached the same conclusions and the patches are also very similar. The one difference is that you also do: > @@ -1581,7 +1581,7 @@ int rtlsdr_open(rtlsdr_dev_t **out_dev, uint32_t index) > reg = rtlsdr_i2c_read_reg(dev, FC0012_I2C_ADDR, FC0012_CHECK_ADDR); > if (reg == FC0012_CHECK_VAL) { > fprintf(stderr, "Found Fitipower FC0012 tuner\n"); > - rtlsdr_set_gpio_output(dev, 6); > + rtlsdr_set_gpio_output(dev, 5); > dev->tuner_type = RTLSDR_TUNER_FC0012; > goto found; > } What is the purpose of this change? I see GPIO 6 is used in fc0012_set_freq(): int fc0012_set_freq(void *dev, uint32_t freq) { /* select V-band/U-band filter */ rtlsdr_set_gpio_bit(dev, 6, (freq > 300000000) ? 1 : 0); return fc0012_set_params(dev, freq, 6000000); } so I think we need to set GPIO 6 to output mode. Best regards, David