Arduino can be built with C20/C++20 or C17/C++17 by switching to the latest gcc-arm-none-eabi. Below shows 2 different ways one using arduino-cli and the other using a Makefile included in this repo.
This example demonstrates how to use the navigation switch and detect if the SD card is inserted. The !INT pin of the GPIO expander IC (PCA9554) triggers an interrupt any time a button is pressed or ...
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