OrangePi Zero3: 26pin UART test

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Chapt 3. Instructions for use of Debian/Ubuntu Server and Xfce desktop system

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Chapter 3 contents

3.19.5. 26pin UART test

1) According to the schematic diagram of the 26pin interface, the available uart is uart5

Img 3.161

2) uart5 is disabled by default in the Linux system, and it needs to be opened manually to use it. The steps to open are as follows:

a. First run orangepi-config, normal users remember to add sudo permission

orangepi@orangepi:~$ sudo orangepi-config

b. Then select System

Img 3.162

c. Then select Hardware

Img 3.163

d. Then use the arrow keys on the keyboard to navigate to the position shown in the figure below, and then use the space to select ph-uart5

Img 3.164

e. Then select 'Save' to save

Img 3.165

f. Then select 'Back'

Img 3.166

g. Then select 'Reboot' to restart the system to make the configuration take effect

Img 3.167

3) After entering the linux system, first confirm whether there is a uart5 device node under /dev

Note that the linux5.4 system is /dev/ttyAS5.

4) Then start to test the uart5 interface, first use the DuPont line to short the rx and tx of the uart5 interface to be tested

uart5 tx pin Corresponding to pin 8 in 26pin rx pin Corresponding to pin 10 in 26pin

5) Finally, you can run the serialTest.py program in the examples to test the loopback function of the serial port. If you can see the following print, it means that the loopback

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