wrote an I2C core, added some registers to access through it, plugged the bus in oh no it doesn't work after twenty minutes of headscratching i realize i didn't actually give the FPGA any clock to run on
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Reminds me of a redstone computer with a 'variable-length clock' -- it raised clock when the current instruction was finished. To halt, all you had to do was not send a clock pulse.
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I've always liked Wireworld for this kind of thing. You have an implicit clock since it's a simulation, so serial data works great and you can just store bits in a loop of wire. It's beautifully simple. https://en.m.wikipedia.org/wiki/Wireworld
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