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products:sbc:common:applications:gpio:40pin-header
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GPIO Header
GPIO usage examples
Please make sure that the GPIOs you want to use are not configured as other functions, if they are, you can follow Device Tree Overlay to configure them as normal GPIOs.
When you get the GPIO number, you can follow the steps below to control it. Here we take GPIO number 465 as an example.
Export GPIO
$ echo 465 | sudo tee /sys/class/gpio/export
Set-up GPIO direction
We can configure direction as input or output.
$ echo out | sudo tee /sys/class/gpio/gpio465/direction # Set GPIO output $ echo in | sudo tee /sys/class/gpio/gpio465/direction # Set GPIO input
Set GPIO value
$ echo 1 | sudo tee /sys/class/gpio/gpio465/value # Set GPIO output high $ echo 0 | sudo tee /sys/class/gpio/gpio465/value # Set GPIO output low
Get GPIO value
$ cat /sys/class/gpio/gpio465/value # Get GPIO input value
Unexport GPIO
$ echo 465 | sudo tee /sys/class/gpio/unexport
Troubleshooting
If you got the similar error below, it means that the PIN you try to export is used for another function, you need to edit Device Tree Overlay configuration file to set the PIN as normal GPIO.
khadas@Khadas:~$ echo 465 | sudo tee /sys/class/gpio/export
tee: /sys/class/gpio/export: Invalid argument
Last modified: 2023/08/16 06:33 by jacobe