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products:sbc:common:applications:gpio:uart
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Table of Contents
UART
Introduction
This document mainly introduces the usage of UART on 40-Pin Header.
UART Information
| UART | PIN & GPIO(#Number) | DT Overlays Node | Device Node | |
|---|---|---|---|---|
| VIM1/2 | UART_AO_B | RX(15) - GPIOAO_5(#506) TX(16) - GPIOAO_4(#505) | uart4 | /dev/ttyS4 |
| VIM3/3L | UART_C | RX(15) - GPIOH_6(#433) TX(16) - GPIOH_7(#434) | uart3 | /dev/ttyS3 |
| VIM4 | UART_E | RX(15) - GPIOY_7(#491) TX(16) - GPIOY_6(#490) | uart_e | /dev/ttyS4 |
Enable UART
Uart PIN in 40-Pin Header is PIN15 and PIN16. Refer to Device Tree Overlay.
Enable uart node via device tree overlays. Edit /boot/env.txt to add uartX to overlays. E.g.
overlays=uart4 pwm_ao_a pwm_f i2c0
Reboot to effect.
- VIM1/VIM2/VIM4 - uar4
- VIM3/VIM3L - uart3
Check UART Node
After reboot, you will see the uart device node.
- VIM1/VIM2/VIM4 - /dev/ttyS4
- VIM3/VIM3L - /dev/ttyS3
Last modified: 2022/07/12 23:02 by nick