CDC ZLP May Be Sent When BULK IN Endpoint Is Not Ready

r2axz / bluepill-serial-monster

USB to 3 Port Serial (UART) adapter firmware for STM32 Blue Pill.

MIT License

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CDC ZLP May Be Sent When BULK IN Endpoint Is Not Ready #17

Closed r2axz closed 3 years ago

r2axz commented 3 years ago

Code does not check is CDC BULK IN endpoint is ready to transmit before sending ZLP packets. This leads to RX data corruption. Surprisingly, nobody reported this behavior, but this issue is very visible when doing stress tests.