I want set GPIO3_05 and GPIO3_07 to be output gpios.
To ensure that LCD drivers are not affected, I removed the LCD drivers from the kernel configuration.And delete LCD related content in DTS.
Then I use sysfs interface to control GPIO for testing.But no level changes were tested.
The following is my operation process:
- In the board
echo 69 > export # 69 is GPIO3_05
echo 71 > export # 71 is GPIO3_07
echo 'out' > gpio69/direction
echo 'out' > gpio71/direction
echo 0 > gpio69/value
echo 0 > gpio71/value
echo 1 > gpio69/value # Can't measure high level
echo 1 > gpio71/value # Can't measure high level
When I use sysfs interface to control GPIO1_26 and GPIO1_27,they are ok.
Is there a mistake in my operation? Please help me!