AXIOMTEK SCM186 User Manual page 38

SCM186 NXP i.MX 8M Plus ARM-based Evaluation Kit
3.5.1.7 GPIO
Herodotus supports GPIO connector for 10 external GPIO control. This section explains how
to control GPIO.
To exercise the external GPIO, it needs to export each GPIO by their GPIO chip number,
there are, the following table and command demonstrates the GPIO chip number and several
steps to configure GPIO.
Vcc
GPIO number N/A
GND
GPIO number N/A
⚫ To export GPIO, please execute the below command.
sh-5.1# cd /sys/class/gpio
echo "GPIO number" > export
sh-5.1#
⚫ To set GPIO direction as input, please execute the below command.
echo in > gpio"GPIO number"/direction
sh-5.1#
⚫ To set GPIO direction as output, please execute the below command.
echo out > gpio"GPIO number"/direction
sh-5.1#
⚫ To get GPIO status, please execute the below command.
cat gpio"GPIO number"/direction
sh-5.1#
⚫ To get GPIO value, please execute the below command.
cat gpio"GPIO number"/value
sh-5.1#
⚫ To set GPIO value, please execute the below command. (GPIO status out only)
◼ GPIO set low
echo 0 > gpio"GPIO number"/value
sh-5.1#
◼ GPIO set high
echo 1 > gpio"GPIO number"/value
sh-5.1#
p.s. The default status of all GPIO is high.
32
DIO0 DIO1 DIO2
43 33 6
DIO5 DIO6 DIO7
133 40 41
DIO3 DIO4
35 36
DIO8 DIO9
42 34
Herodotus BSP User Guide