Spektrum RC Bind Issues after SDK Update
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I've got an older Sentinel that shipped with Spektrum RC satellite receiver and some SDK pre v1.0.0 (I think it's SDK v0.8). It hasn't been used since we got it and I was setting up for first flight. I flashed the lastest SDK (1.6.3) and went through the set up procedure, calibrated it and flew it with the same Spektrum Transmitter I've used for some other Sentinels we've been flying more regularly.
I noticed after power cycling the vehicle and transmitter (Spektrum SPM9900), the Spektrum receiver and transmitter appear to bind automatically as expected (solid orange light on transmitter and receiver light up at same time when powered on), but px4 never gets the RC data (px4-listener input_rc returns never published) until I force them to rebind by running voxl-bind-spektrum -s and setting the transmitter in bind mode.
Does anyone know what could be causing this? I don't know enough about how the spektrum bind board (M0094) works, but reading through voxl-spektrum-bind.c I'm guessing this has something to do with the GPIO pin direction settings. Did the default settings change between SDK versions? I don't have this problem with other Sentinels running SDK 1.1