NVIDIA Jetson Files

How to use GPIO on reComputer J202

Step 1: Open the datasheet of J202

Step 2: Navigate to the section 40 Pin Expansion Header - J10

Step 3: Find the name of the Header Pin # making sure it's default usage is GPIO under the Default Usage / Description column

For example, check Header Pin 15. It's Default Usage is GPIO

Step 4: For the same pin, find the name under Module Pin Name column. In our example, it is GPIO12

Step 5: Enter the terminal of the Jetson device and execute this command

cat /sys/kernel/debug/gpio

Step 6: Find the GPIO number corresponding to the Module Pin Name that we got before

In this case, it is gpio-268 corresponding to GPIO12

Step 7: Execute the following inside the terminal to export gpio-268 pin

sudo -i 
cd /sys/class/gpio
echo 268 > export

Step 8: Set the direction and set the value. Here direction can be in/ out and the value can be 0/ 1

For example, to set GPIO12 to HIGH

cd gpio268
echo "out" > direction
echo 1 > value

To set GPIO12 to LOW

echo 0 > value