Hardware : EB185, EB031, EB034
The device may not enumerate on the USB and you receive a USB device not recognised warning in Windows.
a) The bootloader firmware has become corrupted.
b) There is a program running that is toggling the output controlling the USB pullup circuitry. Pressing Prog and tapping Reset allows the device to be recognised again.
a) Follow the instructions documented inside the Flowcode_ARM/Tools/Bootloader folder.
b) Use J18 to disconnect from the USB circuitry while running programs not meant for USB comms.