Checking and configuring the serial port (baud rate/data sending and receiving, etc.) under the Linux development board

How to set and edit the serial port baud rate and open the specified uart port on the Linux development board?

The following demonstrates commonly used command operations:

1) Edit the configuration file that opens the specified serial port

ls  -l   /boot/uEnv/

sudo   vim  /boot/uEnv/xxx.txt

2) Check whether the serial port is opened successfully

ls  /dev/tty*

3) Check the serial port baud rate

stty -F /dev/ttyS3

4) Set the serial port baud rate

stty -F /dev/ttyS3 ispeed 115200 ospeed 115200

5) Send data to the designated serial port

echo  hello >/dev/ttyS3

6) View the received serial port data

cat /dev/ttyS3