iMX8MMINI GPIO control

Rona_329 — Mon, 13 Feb 2023 07:28:16 GMT

Hello

I have some questions about imx8mmini GPIO control.

"GPIO1_IO09, GPIO1_IO11, GPIO1_IO04" doesn't toggle High and Low.

GPIO1_IO04 is used for PMIC(PCA9450AAHN) "SD_VSEL"

Here are the command about gpio1_io04

echo 4 > /sys/class/gpio/export

echo out > /sys/class/gpio/gpio4/direction

High

echo 1 > /sys/class/gpio/gpio4/value

Low

echo 0 > /sys/class/gpio/gpio4/value

Here are the command about gpio1_io09

echo 9 > /sys/class/gpio/export

echo out > /sys/class/gpio/gpio9/direction

High

echo 1 > /sys/class/gpio/gpio9/value

Low

echo 0 > /sys/class/gpio/gpio9/value

Please help me why the GPIO can't be controlled.

Is there any other purpose in this GPIO pins ?

Re: iMX8MMINI GPIO control

dpog — Mon, 13 Feb 2023 09:42:58 GMT

Did you try to control the GPIOs from your bootloader? I'm facing similar problems, in uboot I can set and read the correct values, but not in the Kernel/Userspace

Re: iMX8MMINI GPIO control

Rona_329 — Fri, 14 Apr 2023 03:49:08 GMT

Control is not working even in bootloader ( U-boot )

Is there anyone who can help me ?

topic iMX8MMINI GPIO control in i.MX Processors

iMX8MMINI GPIO control

Re: iMX8MMINI GPIO control

Re: iMX8MMINI GPIO control