Incorrect output level on GPIO-264 Xavier NX P3668

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
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1

The output logic of GPIO-264 (when programmed as an output pin) is not matching the programmed logic.

On using the file, “/sys/class/gpio/gpio264/value” to control the output of GPIO-264, the actual output at the pin is not matching the programmed value. When the content of the above file is made, “1” i-e it is programmed to logic HIGH, the multimeter reads 0 Volt where as when the file content is made “0” ,the multimeter reads 5 Volt.

This issue happens only with some specific Xavier NX modules.

Could someone please help on whether this issue is because of some fault in the module itself ? As it is a very basic operation to control the logic level of a GPIO and I’m directly using the file to control logic level instead of using a custom software

3

hello msd11,

could you please compare the difference, are they DevKits? or you’re having customize carrier board?
BTW, may I know which GPIO you’re going to controlled? is it GPIO03/ GPIO3_PCC.00?

4

Hi JerryChang,

I have checked the modules in both senarios, devkit & custom carrier board.

Yes it is GPIO03

5

hello msd11,

please see-also Pinmux Changes session, if your custom board schematic differs from that for Jetson AGX Xavier Developer Kit board, you must change the pinmux configuration applied by the software.
may I also know which JetPack release you’re working with, thanks

6

Hi Jerry,

Custom board schematic is not different.

Also, as I said that most of the other Xavier modules operate correctly under the exact same environment, I fear there is some sort of hardware glitch in Xavier itself.

4.4.1

8

NX pin GPIO03 route direct from SOC to BTB on module, nothing special.
It’s voltage level is 1.8V.
There must have additional circuit on carrier if multimeter read 5 Volt. Please check customer how carrier turn 1.8V level to 5V and if have polarity-reversing.

9

Hi JimWang,

As I mentioned earlier also, modules are giving problem with GPIO03 when placed on the devkit too. It has nothing to do with the carrier board.

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@JimWang sorry, I wrote it as 5V by mistake. I wrongly wrote, “High logic” as 5V in my post. Multimeter reads 1.8V only (not 5V as mentioned in the question)

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There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.
Thanks

Hi, please help clarify the info. Is it pin126? Only one Xavier NX module has such issue? If so, please share the S/N of it and also S/N of other normal modules you have tested, thanks.

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