Gpio Test; Export Gpio; Loopback Test - Advantech RSB-4760 User Manual

3.5" sbc with qualcomm apq-8016 processor arm cortex a53 architecture

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$ arecord -D plughw:0,2 -r 16000 -f S16_LE ./f-16000.wav

3.1.4. GPIO Test

$ cd /sys/class/gpio

# GPIO 1~8 (DB9)

$ echo 8 > export

$ echo 9 > export

$ echo 12 > export

$ echo 13 > export

$ echo 24 > export

$ echo 25 > export

$ echo 26 > export

$ echo 27 > export

# GPIO 9~16 (GPIO_INT)

$ echo 28 > export

$ echo 33 > export

$ echo 34 > export

$ echo 35 > export

$ echo 36 > export

$ echo 69 > export

$ echo 73 > export

$ echo 108 > export

1. Connect two GPIO pins respectively. For example, we connect GPIO 1 & 2 together.

2. Set directions

$ echo out > gpio1/direction

$ echo in > gpio2/direction

3. Get values (default should be 0)

$ cat gpio2/value

4. Set values & verify

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