Fun with Raspberry Pi Boards - Part 8 (Serial Port Loop back)

Following commands to be used for looping back from TXD0 to RXD0 on the ttys0 port:

$ sudo su root

$ echo "hello" > /dev/ttyS0

To check the buffer:

$ cat /dev/ttyS0

cat < /dev/serial0

Check the below video to see the connectivity on real board.

https://youtu.be/43fs--_8feA