Controlling serial ports in Linux
Introduction
Built-in serial ports in embedded Linux devices typically show up as
/dev/ttyS0 /dev/ttyS1
You can configure the serial port using the Busybox stty command.
Configuring baudrate
Here is the stty command I use to set the baud rate:
serial_port=/dev/ttyS0 baud=9600 stty -F $serial_port $baud intr ^C quit ^D erase ^H kill ^U eof ^Z eol ^J start ^Q stop ^S -echo echoe echok -echonl echoke -echoctl -istrip -icrnl -ocrnl -igncr -inlcr onlcr -opost -isig -icanon cs8 -cstopb clocal -crtscts -ixoff -ixon -parenb -parodd -inpck
To test the changed baudrate, on a host PC I use picocom.
picocom -b 9600 -r -l /dev/ttyUSB3
where /dev/ttyUSB3 is my host's serial port (via a USB RS-232 dongle).
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