OK, I'll put a blinky on RA2.
Give me some time to modify and test.
In the mean time.
1. Check the voltage on pin 18 Vusb. It should be ~3.3V.
2. D+ uses the internal pull-up to signify FULL speed operation. You should see around 2.8-3.3 volts on pin 24. If not, disconnect the USB cable, and check again.
3. Try plugging another USB device into that USB port on the computer or hub. Make sure the port itself is working.
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