Controlling serial ports in Linux: Difference between revisions
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<seo title="Linux Serial Port Programming | Control Linux Serial Ports" titlemode="replace" keywords="GStreamer, Linux SDK, Linux BSP, Embedded Linux, Device Drivers, Nvidia, Xilinx, TI, NXP, Freescale, Embedded Linux driver development, Linux Software development, Embedded Linux SDK, Embedded Linux Application development, GStreamer Multimedia Framework." description="This useful wiki document contains information on controlling serial ports in Linux. Learn about Linux serial port programming from RidgeRun today."></seo> | |||
== Introduction == | == Introduction == | ||
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[[Category:HowTo]] | [[Category:HowTo]][[Category:Ubuntu]] | ||
Latest revision as of 20:16, 26 January 2018
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).