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We analyze the problem that is occurring when using parity mode transformation required for 9 bit serial communication under Linux environment and propose the solution. The parity mode change is used for 9 bit serial communication in the Linux that by nature supports only 8 bit serial communication. delay (around OS tick) arises. Our analysis shows that the cause is minimum length of waiting time to transmit data remained in Tx FIFO buffers. A modified Linux serial driver proposed in this paper decreases the delay less than 1ms by using accurate time delaying. Despite various system communication interfaces, enormous existing standards and system have adopted RS-232 serial communication, and the part of them have communicated by 9bit serial.

Diagnosis and Improvement of mode transition delay in Linux 9bit serial communications