SPI interface to the FlySky/Turnigy 9x

Interfacing a RC radio to a microcontroller is a bit of a pain, especially if you want a lot of channels, because you have to time each channel's output individually. An AVR only has one 16 bit timer with two compare channels, so either you can only use two channels at full resolution or you have to waste lots of cycles sampling it. The other hassle is having loads of wires running from the rx to the micro. ...

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