I am trying to get the GPIO pins on a USRP B210 working from GNU radio using the ATR to toggle GPIO states. I have it working for channel A but can not get it to toggle when transmitting or receiving on channel B. I want to have both channel A and B toggle separate pins as they will be toggling an amp when transmitting. Alternatively, if both are toggled when either channel is transmitting is workable too. Channel B is working for the signal but I am unsure how to select channel B to control the ATR. I have gone through the commands which select the different sources and banks to control the GPIOs but usually just get a "not implemented for this motherboard" error. Any help would be greatly appreciated, thank you.
