pps_fetch : timeout 3.000000000

Issue Overview

Users are experiencing a recurring timeout error related to the PPS (Pulse Per Second) functionality on the Nvidia Jetson Orin Nano Dev board. The specific error messages observed in the system logs include:

• pps pps0: PPS_FETCH
• pps pps0: timeout 3.000000000

These messages appear consistently during operations involving GPIO (General Purpose Input/Output) configurations, particularly when enabling PPS on selected GPIO pins. The issue seems to manifest after users have successfully configured the GPIOs but encounter these timeout messages during runtime.

The affected users have reported using the Orin Nano 8GB Devkit with Jetpack version 5.1.2. The frequency of the issue appears to be consistent, impacting the reliability of time-sensitive applications that depend on accurate PPS signals. Although some users have indicated that these timeout messages can be ignored, they still express concerns about the implications for their projects.

Possible Causes

Several potential causes for this timeout issue have been identified:

• Hardware Incompatibilities: If the GPIO pins are not properly configured or if there are defects in the hardware, it can lead to communication failures with the PPS system.

• Software Bugs: There may be unresolved bugs in Jetpack 5.1.2 that affect how PPS is handled or reported.

• Configuration Errors: Incorrect setup of the GPIO pins or PPS settings could lead to these timeouts, especially if parameters are not aligned with expected values.

• Driver Issues: Outdated or incompatible drivers may not support the required functionality for PPS, resulting in timeouts.

• Environmental Factors: Issues such as power supply instability or temperature fluctuations could affect GPIO performance and lead to timeouts.

• User Misconfigurations: Users might inadvertently misconfigure settings or overlook necessary steps in enabling PPS.

Troubleshooting Steps, Solutions & Fixes

To address the timeout issue effectively, users can follow these troubleshooting steps:

1. Verify Hardware Setup:

   • Ensure that the GPIO pins used for PPS are correctly wired and configured.
   • Check for any visible defects on the board or loose connections.

2. Check Software Version:

   • Confirm that you are using Jetpack version 5.1.2, as earlier versions may have unresolved issues.
   • Consider updating to a newer version if available, as bug fixes may resolve this issue.

3. Review Configuration Settings:

   • Double-check GPIO configurations using relevant commands:

     sudo jetson-io
     

   • Ensure that PPS is enabled correctly in your configuration files.

4. Examine System Logs:

   • Use dmesg to review system logs for additional context around the timeout messages:

     dmesg | grep pps
     

5. Test with Different Configurations:

   • Try using different GPIO pins for PPS and observe if the issue persists.
   • If possible, test with a different Orin Nano board to rule out hardware defects.

6. Driver Updates:

   • Ensure all drivers are up-to-date by running:

     sudo apt-get update
     sudo apt-get upgrade
     

7. Power Supply Check:

   • Verify that your power supply meets the requirements for stable operation of the Orin Nano and connected peripherals.

8. Ignore Non-Critical Messages:

   • Some users have noted that these timeout messages can be ignored without impacting functionality significantly; however, this should be evaluated based on your specific application needs.

9. Consult Documentation and Community Resources:

   • Refer to Nvidia’s official documentation for any updates regarding GPIO and PPS configurations.
   • Engage with community forums for shared experiences and solutions from other users facing similar issues.

10. Report Unresolved Issues:

    • If none of the above steps resolve your problem, consider reporting it on Nvidia’s developer forums with detailed logs and descriptions of your setup.

By following these steps, users can systematically diagnose and potentially resolve the timeout issues related to PPS on their Nvidia Jetson Orin Nano Dev boards.