How To Use Uart

This documentation will introduce how to use the uart of 40PIN headers.

Check Uart Hardware PINs

Uart PIN in 40 PINs header is PIN15 and PIN16:

Enable uart node via device tree overlays. Edit /boot/env.txt to add uartX to overlays.

e.g.

1	overlays=uart4 pwm_ao_a pwm_f i2c0

e.g.

VIM1/VIM2 - uar4

VIM3/VIM3L - uart3

Reboot to take effect.

After reboot, you will see the uart device node.

e.g.

VIM1/VIM2 - /dev/ttyS4

VIM3/VIM3L - /dev/ttyS3