Commits on Mar 1, 2021

1. Disable USB pullup when stopping USB …

   It turns out that stopping the USB peripheral does not automatically
   reset this pullup, so stopping USB (e.g. through USBDevice.detach())
   would let the pullup enabled, making the USB host think the board was
   still connected (but any subsequent communication would fail).
   Additionally, this would use around 300μA of current.
   
   This is a bug in the USB HAL used. This commit backports a small change
   from the HAL v1.11.3 to fix this.
   
   This fixes GrumpyOldPizza#171

   

   matthijskooijman committed Mar 1, 2021
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