Connecting MCP2515 to Jetson Orin Nano

Issue Overview

Users are experiencing difficulties connecting an MCP2515 CAN module to the Nvidia Jetson Orin Nano. The main symptoms include:

• Power Issues: The MCP2515 module does not power up, indicated by the PWR LED remaining off despite connections to 5V and GND, with voltage readings around 4.9V.
• Compilation Errors: When attempting to compile the module using the command make all_jetsonnano, users encounter multiple compilation errors, including "too few arguments to function" and "implicit declaration of function" errors in the source code.
• Context: This issue arises during the setup phase while trying to integrate the CAN interface with ROS2 for data acquisition.
• Frequency: The problem appears consistently for users attempting similar setups.
• Impact: The inability to power the MCP2515 and compile necessary drivers significantly hampers users’ ability to utilize the Jetson Orin Nano for their intended applications.

Possible Causes

1. Hardware Incompatibility: The MCP2515 may not be compatible with the Jetson Orin Nano’s hardware configurations or pin mappings, especially if using a custom carrier board instead of a devkit.
2. Power Supply Issues: Insufficient power supply or incorrect voltage levels could prevent the MCP2515 from powering up properly.
3. Software Bugs: The source code for the MCP2515 driver may contain bugs or may not be fully compatible with the kernel version used by Jetson Orin Nano.
4. Configuration Errors: Incorrect setup or configuration of the CAN interface in ROS2 or during compilation could lead to these issues.
5. Driver Issues: Missing or outdated drivers specific to the MCP2515 module could result in compilation errors and operational failures.

Troubleshooting Steps, Solutions & Fixes

1. Verify Power Supply:

   • Ensure that the MCP2515 is receiving a stable 5V supply.
   • Use a multimeter to check voltage levels at the module pins.

2. Check Hardware Connections:

   • Confirm that all wiring between the Jetson Orin Nano and MCP2515 is correct, especially SPI connections (MOSI, MISO, SCK, CS).
   • If using a custom board, verify that pin mappings correspond correctly.

3. Perform SPI Loopback Test:

   • Conduct an SPI loopback test to ensure that SPI communication is functioning correctly on the Jetson Orin Nano.

4. Update Software and Drivers:

   • Ensure that you are using the latest version of JetPack compatible with your Jetson Orin Nano.
   • Check for any updates or patches for MCP2515 drivers or related software libraries.

5. Compile with Correct Options:

   • When running make all_jetsonnano, ensure you are using the correct kernel headers that match your current JetPack version.
   • If compilation errors persist, review and modify the source code as needed based on error messages (e.g., adding missing function arguments).

6. Consult Documentation and Community Resources:

   • Refer to official Nvidia documentation for guidance on setting up CAN interfaces on Jetson devices.
   • Seek assistance from community forums where similar issues have been discussed.

7. Testing Alternative Configurations:

   • If possible, test with another MCP2515 module or a different CAN interface to rule out hardware defects.
   • Experiment with different versions of ROS2 or other software configurations that might affect compatibility.

8. Contact Vendor Support:

   • If issues persist, reach out to your vendor for specific guidance on using the MCP2515 with your Jetson device, including any porting guides.

Recommended Approach

Many users have reported success after verifying their power supply and ensuring correct hardware connections before proceeding with software installation and configuration adjustments.