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67a6d5724c
Before this patch, all UART characters went through a fifo/ringbuffer of depth 512, while events like timeout were delivered directly via a global flags variable from ISR to main code. This means that one or more correct/complete TPDUs could theoretically still be in the FIFO, but the "Fast path" of the timeout handling is pre-empting that and messing with the state machines. All events from the UART should be delivered via the ring-buffer to make sure they arrive in order at the main function. The old "report timeout via change flags in separate USB message" code is left in place. On the USB protocol we should keep it for compatibility. Internally we should probably also migrate that over to the new ring-buffer method in a second step. Change-Id: I4434c6fcd59d1a425e9ded734bbc8b0411a0a0d8