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Do not order the board, or blindly copy the design, there are several known issues. Namely:

  • USB-PD doesn't work. I thought I could do dead battery the way I did, but it's not a good way to do it, use PA9 and PA10 instead
  • Display reset needs to be wired via an RC filter to 3.3V
  • Vref needs to be connected up
  • Button logic is flipped - so DFU firmware upload doesn't work
  • There are unidirectional transils on the input - which blow up when incorrect polarity is plugged in. Should be replaced by bidirectional transils, the ideal diodes will protect the input
  • There aren't dedicated I2C pullups, which limits speed

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