It happens very often that the IDE doesn't load anything when you open it and you only see a white surface. Furthermore, it takes a long time (maybe 30 sec) until a source code becomes visible when it ...
I have code that has been working for a long time. It uses hardware SPI to communicate with a couple devices. After updating from Arduino IDE 2.0.4 to Arduino IDE 2.1.0, hardware SPI no longer works.
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