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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
I'd not have expected a busy pin but a register that can be read whether the controller is busy or it would respond on a command to not have accepted it because being busy. I have to read up on the HT16K33 controller. The lines cannot be read for it because the data line changes between input and output and the clock is always (open) output (because of stretching by client).