OK3568 4.19.206 Buildroot Command Line Control of GPIO Pins
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Revision History
Date |
Version |
Revision History |
|---|---|---|
04/08/2022 |
V1.0 |
Initial Version |
Command Line Control of GPIO Pins
1. Control GPIO pins through sysfs/sys/class/gpio
A-D corresponding 1-4：A-1，B-2，C-3，D-4.
GPIOn_xy =n*32+(x-1)*8+y
GPIO4_C6=4*32+(3-1)*8+6=150
2. Configure gpio as input read state
[root@rk3568:/]# echo 150 > /sys/class/gpio/export //Export GPIO4_C6 pin
[root@rk3568:/]# echo in > /sys/class/gpio/gpio150/direction //Set IO input direction
[root@rk3568:/]# cat /sys/class/gpio/gpio150/value //View IO value
[root@rk3568:/]# echo 150 > /sys/class/gpio/unexport //Unexport Pin
3. Configure gpio to set state for output
[root@rk3568:/]# echo 150 > /sys/class/gpio/export //Export GPIO4_C6 pin
[root@rk3568:/]# echo out > /sys/class/gpio/gpio150/direction //Set IO output direction
[root@rk3568:/]# echo 0 > /sys/class/gpio/gpio150/value //Set IO output to low level
[root@rk3568:/]# echo 1 > /sys/class/gpio/gpio150/value //Set IO output to high level
[root@rk3568:/]# echo 150 > /sys/class/gpio/unexport //Unexport Pin