We like to use our Pretty Pins generator to make lovely and *accurate* diagrams of dev boards. It starts with the Fritzing object (which is generated from the original Eagle files), and then cross references the Arduino and CircuitPython variant definition file to get the true pin names of each exposed pad and signal. Finally it looks up the multiplexing functionality for that gpio pin on the chip in a spreadsheet to generate the lovely label boxes. The pinmux spreadsheet has to be made by hand but we finally got around to doing the massive table used for the SAMD51 so we can now generate Pretty Pins for all SAMD51-based designs. You can see the CSV here https://github.com/adafruit/PrettyPins/blob/main/samd51pins.csv & video.
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