AnsweredAssumed Answered

imx6ul-evk GPIO3 Unable to operate

Question asked by on Feb 28, 2019
Latest reply on Mar 7, 2019 by

Board: imx6ul-evk

BSP: fsl-yocto-L4.1.15_2.0.0-ga


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

cd /sys/class/gpio/

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  > 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!