The commit ba64a745 fixed rtlsdr_set_gpio_output() but also caused librtlsdr to stop working with (at least some) dongles with the FC0012 tuner. It seems that the FC0012 is connected to GPIO 4 while rtlsdr_open() assumes it's connected to GPIO 5. Before ba64a745 the bug in rtlsdr_set_gpio_output() caused GPIOs 3 and 4 to be set low and so everything worked. This changes the GPIO used in rtlsdr_open() from 5 to 4. At least on my dongle this fixes the regression. --- src/librtlsdr.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/src/librtlsdr.c b/src/librtlsdr.c index b369a5d..4fb2128 100644 --- a/src/librtlsdr.c +++ b/src/librtlsdr.c @@ -1565,11 +1565,11 @@ int rtlsdr_open(rtlsdr_dev_t **out_dev, uint32_t index) } /* initialise GPIOs */ - rtlsdr_set_gpio_output(dev, 5); + rtlsdr_set_gpio_output(dev, 4); /* reset tuner before probing */ - rtlsdr_set_gpio_bit(dev, 5, 1); - rtlsdr_set_gpio_bit(dev, 5, 0); + rtlsdr_set_gpio_bit(dev, 4, 1); + rtlsdr_set_gpio_bit(dev, 4, 0); reg = rtlsdr_i2c_read_reg(dev, FC2580_I2C_ADDR, FC2580_CHECK_ADDR); if ((reg & 0x7f) == FC2580_CHECK_VAL) { -- 2.14.2