USB OTG Interface Configuration for Jetson Orin Nano Custom Carrier Board

Issue Overview

Users developing a custom carrier board for the Jetson Orin Nano are seeking information on how to interface with a USB micro B connector, specifically focusing on the "ID" pin of the USB OTG (On-The-Go) connector. This issue arises during the hardware design phase of a custom board implementation, where developers need to understand how to properly configure and utilize the USB OTG functionality with the Orin Nano module.

The main challenges include:

• Configuring the "ID" pin on the USB OTG connector
• Ensuring compatibility with the Jetson Orin Nano, which doesn’t have a direct provision for the ID pin
• Adapting existing documentation, which primarily focuses on Type-C connectors, to work with Type-B connectors

Possible Causes

1. Limited Documentation: The primary documentation and reference designs for Jetson Orin platforms are focused on USB Type-C connectors, making it challenging to implement Type-B connectors.

2. Hardware Differences: The Jetson Orin Nano may have different USB controller configurations compared to other Jetson modules, leading to uncertainty in the implementation.

3. Software Configuration: Improper device tree configuration in the Jetpack software could prevent proper recognition and functionality of the USB OTG port.

4. Pin Compatibility: The absence of a direct provision for the ID pin on the Orin Nano module may require additional circuitry or configuration to enable OTG functionality.

Troubleshooting Steps, Solutions & Fixes

1. Refer to AGX Documentation:

   • Use the Jetson AGX Orin documentation for USB configuration, as confirmed by NVIDIA that the method is the same for Orin NX/Nano.
   • Access the documentation at: https://docs.nvidia.com/jetson/archives/r36.3/DeveloperGuide/HR/JetsonModuleAdaptationAndBringUp/JetsonAgxOrinSeries.html?highlight=universal#porting-the-universal-serial-bus

2. Device Tree Configuration:

   • Modify the device tree to enable the USB OTG port.
   • Example configuration (adjust as needed):

     usb@3610000 {
         compatible = "nvidia,tegra234-xusb";
         reg = <0x0 0x3610000 0x0 0x40000>;
         interrupts = <0 167 0x4>;
         iommus = <&smmu TEGRA_SID_XUSB_HOST>;
         status = "okay";
     };
     

3. Hardware Design Considerations:

   • Although there’s no specific schematic provided for Type-B connectors, design your custom board based on the Type-C diagrams in the design guide document.
   • Implement the necessary circuitry to handle the ID pin functionality, possibly using a resistor network or a USB OTG controller IC.

4. Software Compatibility:

   • Ensure you are using Jetpack 6, as mentioned in the discussion.
   • Check for any USB-related updates or patches in the latest Jetpack release notes.

5. Testing and Verification:

   • After implementing the hardware and software configurations, test the USB OTG functionality using various USB devices.
   • Use the following command to verify USB device recognition:

     lsusb
     

6. Community Support:

   • If issues persist, consider reaching out to the NVIDIA Developer forums or the Jetson community for specific implementation advice.

7. Alternative Connector Consideration:

   • While Type-B is still supported, consider using Type-C connectors as they are the primary focus for all Orin platforms moving forward.
   • This may simplify future updates and ensure better long-term support.

8. Documentation Gap:

   • Be aware that there might be a lack of specific documentation for Type-B connectors on Orin Nano.
   • Document your implementation process and consider sharing it with the community to help others facing similar challenges.