GPIO pins SD pins as GPIO pins

Nagarjuna Reddy

@crispyoz
How to use SD_CD pin 23 & SD_WD pin 22 as GPIO pins.

crispyoz

https://docs.onion.io/omega2-docs/pin-multiplexing.html

Nagarjuna Reddy

@crispyoz
they don't mention how to utilize SDIO pins clearly. They have mentioned clearly below the GPIO pins

crispyoz

@Nagarjuna-Reddy I can't test this right now, but first I think you need to remove the sdcard module as it will likely be managing the registers:

rmmod mtk_sd

Then I expect you can use the GPIO like so:

gpioctl dirout-high 22
gpioctl get 22
gpioctl dirout-low 22
gpioctl get 22

cat /sys/class/gpio/gpio22/value

Nagarjuna Reddy

@crispyoz
gpio 22 not created

cd /sys/class/gpio/
root@Omega-6834:/sys/class/gpio# ls
export gpiochip0 gpiochip32 gpiochip64 unexport
root@Omega-6834:/sys/class/gpio# ls
export gpiochip0 gpiochip32 gpiochip64 unexport

i enabled high gpio22, but voltages not showing.

Nagarjuna Reddy

@crispyoz said in GPIO pins SD pins as GPIO pins:

rmmod mtk_sd
Then I expect you can use the GPIO like so:
gpioctl dirout-high 22
gpioctl get 22
gpioctl dirout-low 22
gpioctl get 22
cat /sys/class/gpio/gpio22/value

voltage always showing HIGH. LOW method not happening.
SD_WP_21 always showing HIGH(3.45V)
SD_CD_23 always showing HIGH(3.45V)