LinuxGPIO or SPI doesn't work on NVIDIA Orin Nx

[ltidswell]

LinuxGPIO or SPI doesn't work on NVIDIA Orin Nx

[mcuee]

@SebKuzminsky

Just wondering if you can help here since you are the author of PR #1299.

• #1299

[mcuee]

@s-wakaba

Just wondering if you can help here as well since you seem to be familiar with linuxspi.

• #1100

[mcuee]

@ltidswell

Please help to use libgpiod and try latest git main. Thanks.

[ltidswell]

@stefanrueger Found the issue to be the SPI pins don't output enough current (20uA) on the Nvidia SOMs. Selecting pins that output 20mA (I2C pins, datasheet: https://files.seeedstudio.com/products/NVIDIA/reComputer-J401x-datasheet.pdf) works using linuxGPIO but still had to manually convert to Nvidia GPIO names. Am attempting to use a non-inverting buffer on the SPI pins to see if that works. @mcuee will try git main when I get a chance but hoping using a buffer will fix the issue.

[mcuee]

@ltidswell

Are you using sysfs and not libgpiod? If that is the case, please try libgpiod to see if that works.

Reference: please refer to this discussion, once the user switches to libgpiod, the problem got resolved.

• #1737

[stefanrueger]

@ltidswell Just checking where you are with this issue?

[stefanrueger]

Thanks for reporting back. This might help others with the same issue.

manually convert to Nvidia GPIO names

If you have an idea how git main could help please tell us in more detail. Better still submit a PR, eg, where the GPIO naming scheme is a -x command line parameter or a parameter in the avrdude.conf entry.