Navio2 PPM (RCInput) Problems

I am having problems connecting my Spectrum Dx9 to the Navio2 autopilot. I’ve tried two different Spektrum setups with no luck. The first configuration uses the AR9310 receiver and the 3DR PPM decoder. I also tried using the AR7700 that has a built-in PPM decoder. When I run the cat /sys/kernel/rcio/status/alive I receive a 0. I was able to connect successfully to APM planner over UDP; everything is working except for RCInput.

Board Configurations

PPM Signals


Problem solved hardware issue with raspberry pi.