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Earle F. Philhower, III authored
When the Serial software FIFOs overeflowed, the IRQ handler would not read any more data from the hardware FIFOs. This would cause the IRQ handler to be continually called as soon as it exited since the HW FIFOS were not empty. Now always read every available HW FIFO entry and throw out any that don't fit in the SW FIFO. Also fix a too long by half stop bit timing in the PIOSerial receiver.
3a2a7f8c
