When building Radio devices with the Rpi02W, I am using a modified form of the CM108 SoundCard that interfaces with the OTG cable, and is controllable with the /dev/hidraw0 via the cable. It means that I can control a transceiver via the card and not use the gpio bus on the Rpi02W. Makes for miniaturisation of the whole interface. Ideally a shorter cable with two right angled plugs would be even better. One facing left and the other right would be superlative, so the two boards would fit in the smaller box.
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