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@BrucePerens_K6BP The actual demodulation code is the same, since it's running on the processor, but e.g. the spectrum calculation takes place in the FPGA.
A lot of interaction with the programmable logic is hidden in the kernel driver which is controlled via ioctls.
The forked KiwiSDR code can be found here https://github.com/RaspSDR/server/tree/master, but the source code of the kernel module unfortunately not.
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