Confirm serial port hardware pins
Uart pin in 40 pins header is pin15 and pin16
Open uart node
openg uart node via device tree overlays.
vim /boot/env.txt |
Make sure UART is in the overlays list (default is enable).
overlays=uart4 pwm_ao_a pwm_f i2c0 |
note: VIM1/VIM2 is uar4,VIM3/VIM3L is uart3
Setting serial tool in PC
Connect you board’s uart and you PC via ttytoUSB tool.
The baud rate is set to 115200, here is Ubuntu as an example:
sudo minicom -b 115200 -D /dev/ttyUSBx |
How to Use
Open the terminal on the board and set the serial port baud rate.
sudo stty -F /dev/ttySx 115200 |
Print info via echo command
echo khadas | sudo tee /dev/ttySx |
You will receive khadas in you PC