CODEWITHSUNDEEP
linuxserial-portuarttermios
Samuel
Samuel

Reputation: 8935

How do the CLOCAL and CRTSCTS Flags in termios.c_cflag Affect the Serial Port?

I want to configure a UART to use the Hardware Flow Control lines RTS and CTS in Linux. According to http://linux.die.net/man/3/termios, CRTSCTS enables RTS/CTS (hardware) flow control, and CLOCAL configures the serial port to ignore modem control lines. The 2 flags seem contradictory, how can you have hardware flow control enabled with CRTSCTS and ignore the lines with CLOCAL?

Upvotes: 8

Views: 17560

Answers (1)

ninjalj
ninjalj

Reputation: 43718

CLOCAL ignores only the CD signal.

Upvotes: 12

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