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well now I’m unsure again. SDO/SDI seems to be consensus, but MOSI/MISO has clarity when there are both controllers and peripherals on a board. COPI/CIPO retains that clarity, but CIPO has issues in the Polish language. And some folks say to keep the terms as Main/Selected. Torn. https://twitter.com/josecastillo/status/1284103460607139841

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