Jack, one version of my radio (it has been in progress for 10 years!) did use the Raspberry PI for the display. I used Python and it worked quite well. Hated the? boot time so I looked at other options.? My radio, up until now, always used a DSPIC as the RX and TX processor, modeled somewhat from the SDRCube project. Another processor has always been used for the UI. I even split the audio processing up with another DSPIC. An FPGA has always been the frequency/down/up convertor.? Next iteration used an ARM (Microchip again) running at 300MHz for the UI and that worked quite well. The current iteration uses two Teensys, one for the UI and the other in place of the DSPIC.
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Russ
