How to use Jetson AGX Orin GPIO pins?

Robotics & Edge Computing Jetson Systems Jetson AGX Orin
1

I wrote a python script using the JETSON.GPIO library to turn a GPIO pin on and off every second, but I cannot measure any change in voltage when the pin is on or off. Is there some sort of initialization I need to do to set up the GPIO pin before running the script?

2

*** Please note that this reply is generated by LLM automatically ***

Based on the provided context, it appears that you are using the Jetson Generic Timestamp Engine (GTE) to monitor GPIOs on the Jetson AGX Orin. However, you are experiencing issues with measuring voltage changes on the GPIO pin when using the JETSONGPIO library.

To resolve this issue, you need to ensure that the GPIO pin is properly configured before running your script. Here are some steps to follow:

  1. Enable the GPIO pin: Make sure that the GPIO pin you are using is enabled in the Jetson device tree. You can do this by checking the device tree file for your Jetson AGX Orin. The device tree file is usually located in the /boot directory.

  2. Configure the GPIO pin as an output: Use the gpio command to configure the GPIO pin as an output. For example, if you are using GPIO pin 17, you can use the following command:

gpio -g mode 17 out

   This will set the GPIO pin 17 as an output.

3. **Set the GPIO pin direction**: Use the `gpio` command to set the direction of the GPIO pin. For example:
   ```bash
gpio -g write 17 1

This will set the GPIO pin 17 to high (1).

  1. Use the JETSONGPIO library: Once you have configured the GPIO pin, you can use the JETSONGPIO library to control the pin. Make sure to import the library and initialize the GPIO pin before running your script.

Here’s an example of how you can use the JETSONGPIO library to turn a GPIO pin on and off every second:

import jetson.GPIO as GPIO
import time

# Initialize the GPIO pin
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.OUT)

while True:
 # Turn the GPIO pin on
 GPIO.output(17, GPIO.HIGH)
 time.sleep(1)
 
 # Turn the GPIO pin off
 GPIO.output(17, GPIO.LOW)
 time.sleep(1)

This script will turn the GPIO pin 17 on and off every second.

Comparison with other Jetson devices: The steps to configure and use GPIO pins on the Jetson AGX Orin are similar to those on other Jetson devices, such as the Jetson Xavier NX and Jetson AGX Xavier series. However, the device tree file and GPIO pin numbering may differ between devices. Make sure to check the device tree file and GPIO pin numbering for your specific Jetson device.

Additional notes: Make sure to use the correct GPIO pin numbering scheme (BCM or BOARD) when using the JETSONGPIO library. Also, ensure that the GPIO pin is not being used by another process or device, as this can cause conflicts and prevent the pin from functioning correctly.

*** Please give the thumbs up if you get answers you like. Or provide feedback to help us improve the answer. ***

4

Hi joeyf,

Are you using the devkit or custom board for AGX Orin?
What’s the Jetpack version in use?

Have you configured the pinmux for the desired pin as GPIO/Output before use?

5

I have not configured the pinmux, how do I do that

6

Please refer to Jetson AGX Orin Platform Adaptation and Bring-Up — Pinmux Changes to update pinmux.