Strange gain behaviors

[KarlL2]

Hi,

I opened an issue on SoapyBladeRF pothosware/SoapyBladeRF#30 but it seems to be linked to libBladeRF.

I tried setting the gain of the RX but it would always return 60. It seems that I first need to set the gain mode to manual, and then set the gain. I would have expected the gain to automatically go to manual if I set it.

A strange thing though, is that it seems the gain doesn't get set at once. I roughly do

SoapySDRDevice *sdr = SoapySDRDevice_make(&args);      // open device
SoapySDRDevice_setGainMode(sdr, dir, chan, false);     // set gain to manual
SoapySDRDevice_setGain(sdr, dir, chan, gain);          // set gain
returnedGain = SoapySDRDevice_getGain(sdr, dir, chan); // get gain
SoapySDRDevice_unmake(sdr);                            // close device

Each time I run it, getGain returns the gain set at the previous run. So I ask for 10 and I get 0, then 15 and I get 10, 20 and I get 15, ...

Also SoapySDRDevice_getGainMode returns always false, whether the gain is set to auto or manual (for this I'm not sure if SoapyBladeRF should check against BLADERF_GAIN_MGC or BLADERF_GAIN_MANUAL instead).

[KarlL2]

This issue doesn't happen anymore. I opened a different one for another gain issue https://github.com/Nuand/bladeRF/issues/746 .