Xavier AGX power module abnormal

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
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1

Hi,
I want to use Jetson xavier AGX board extern 40 pin gpio，below is my operation. I find there’s no change in the level.The gpio is always low level.Can you give me some advise?

image
image955×591 78.6 KB

root@ubuntu:/sys/class/gpio# echo 352 > export
root@ubuntu:/sys/class/gpio# ls
export  gpiochip305  gpiochip335  gpiochip504  PC.07  unexport
root@ubuntu:/sys/class/gpio# echo "out" > PC.07/
active_low  direction   power/      uevent
device/     edge        subsystem/  value
root@ubuntu:/sys/class/gpio# echo "out" > PC.07/
active_low  direction   power/      uevent
device/     edge        subsystem/  value
root@ubuntu:/sys/class/gpio# echo "out" > PC.07/direction
root@ubuntu:/sys/class/gpio# echo 1 > PC.07/value
root@ubuntu:/sys/class/gpio# echo 0 > PC.07/value
3

Hi xubin4952,

Are you using the devkit or custom board for AGX Xavier?
What’s your Jetpack version in use?

It seems PIN40(I2S_SDOUT) is PI.00 rather than PC.07.
Please share the result of the following command for further check.

# cat /sys/kernel/debug/gpio|grep PI.00
4

Hi Kevin，

I am using devkit.Do you have a user guide for extern 40 pin?

R35.0

~$ sudo cat /sys/kernel/debug/gpio|grep PI.00
gpio-387 (PI.00

5

Hi Kevin，
Can you provide some advice？

6

You can download the Jetson AGX Xavier Developer Kit Carrier Board Specification in Jetson Download Center | NVIDIA Developer for details.

Do you mean R35.5.0?

Please run the following command to verify the controlling for PIN40 of 40-pins expansion header.

$ sudo su
# cd /sys/class/gpio
# echo 387 > export
# cat PI.00/direction
# cat PI.00/value
# echo out > PI.00/direction
# echo 1 > PI.00/value
# echo 0 > PI.00/value
7

Hi Kevin ，
Thank you for your reply！

Yes

PIN40 of 40-pins expansion header can work now , thank you!

I want to know how to confirm the number of gpio pin like 387 for I2S_SDOUT(PI.00).
How to get the number of other pin?

8

First, you should check the carrier board document for the details of your pin like the following.

IMG_0854
IMG_08541606×120 64 KB

=> you would know this pin is pinmux with PI.00.

Then, you can run the following command to check its GPIO number used for sysfs.

$ sudo cat /sys/kernel/debug/gpio|grep "PI.00"
10

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