UART test

sudo usermod -aG dialout $USER
sudo reboot

stty -F /dev/ttyS0 115200 cs8 -cstopb -parenb
stty -F /dev/ttyS1 115200 cs8 -cstopb -parenb
cat /dev/ttyS0
echo "123" > /dev/ttyS1

 

1. Oepn read terminal with ttyS0

2. Open write terminal with ttyS1

3. On read terminal, read ttyS0

4. On write terminal, write "123"

5. Should see "123" on read terminal

 

 

In case minicom...

minicom -D /dev/ttyS1

you can type strings on minicom screen and will get at opposite terminal