Working with discrete inputs in Linux
The discrete input can be in one of two states:
Status |
Description |
|---|---|
0 |
Input open (not connected) |
1 |
Input is shorted to the common wire (GND) |
Initialization:
Note
By default in Armbian Linux the GPIO pins are configured to sysfs mode at system boot and no additional configuration is required.
cd /sys/class/gpio
echo 472 > export
echo in > gpio472/direction
If you need to invert the input logic:
echo 1 > gpio472/active_low
Read the state of the digital input:
cat gpio472/value