Advantech RSB-3720, User Manual

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RSB-3720 User Manual 42
3.11 GPIO
3.11.1 GPIO Pins
3.11.2 GPIO Loopback Test (Using GPIO2 and GPIO4 as examples)
Step 1: Connect GPIO2 and GPIO4
Step 2: Export GPIO interface
Step 3: Set GPIO direction
Step 4: Read value and set output value than check
Table 3.1: UIO Extension 1 (UIO1)
Pin Numbers
GPIO2 501
GPIO4 503
Table 3.2: UIO Extension 2 (UIO2)
Pin Numbers
GPIO5 504
GPIO6 505
GPIO7 506
GPIO8 507
GPIO9 508
GPIO10 509
GPIO11 139
GPIO12 138
root@imx8mprsb3720a1:~# echo 501 > /sys/class/gpio/export
root@imx8mprsb3720a1:~# echo 503 > /sys/class/gpio/export
root@imx8mprsb3720a1:~# echo out > /sys/class/gpio/gpio1/direction
root@imx8mprsb3720a1:~# echo in > /sys/class/gpio/gpio2/direction
root@imx8mprsb3720a1:~# cat /sys/class/gpio/gpio2/value
0
root@imx8mprsb3720a1:~# echo 1 > /sys/class/gpio/gpio1/value
root@imx8mprsb3720a1:~# cat /sys/class/gpio/gpio2/value
1