IBASE MRS-801-RE - Manual (Page 89)

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How to use GPIO in Linux
1.2.1 GPIO Mapping Table
GPIO
Logical Number Physical Number
1 32
2 33
3 34
5 36
7 38
8 39
9 81
10 82
11 40
12 41
1.2.2 GPIO Sample Code
# GPIO example 1: Output (take GPIO 32 as example)
echo 32 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio32/direction
echo 0 > /sys/class/gpio/gpio32/value
echo 1 > /sys/class/gpio/gpio32/value
# GPIO example 2: Input (take GPIO 32 as example)
echo 32 > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio32/direction
cat /sys/class/gpio/gpio32/value