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@Gordon
When I looked at the timeout length, I don't think there was any specific spec - but 1ms seemed the one everyone went for - so it's doable, but a bit close and I guess it could end up being unreliable.
Good idea about the 'common' I2C slave mode. We could do a similar one with SPI slave as well. Just something like an array of arrays that could be indexed for reading - and writes could just go via a callback.