Xavier_NX,40-Pin Expansion Header

[lvyefeng666]

hi:
I want to operate on gpio9, but there is no result.

May I ask you a few questions:

1.Port inconsistency.
This link:https://jetsonhacks.com/nvidia-jetson-xavier-nx-gpio-header-pinout/

GPIO9 is gpio436.

But,this file<Jetson_Xavier_NX_DevKit_Carrier_Board_Specification_v1.0.pdf> about 40-Pin Expansion Header,

GPIO9 is 211.
So,What is GPIO9 corresponding to?

2.How to operate GPIO9
Jetson Linux Path is /sys/class/gpio,I did the following:
2.1“ech 436 > export”,The folder that appears is“PQ.01”.
2.2 cd PQ.01;
echo “out” > direction;
echo “1” > value;
so,I used a multimeter to measure the change in pin and there was no 3.3V voltage.

Looking forward to answers.

[Trumany]

1. It is pin 211, please refer to official doc only.
2. GPIO09 is GPIO3_PS.04. You should check the pinmux setting in pinmux sheet file in DLC first.

[lvyefeng666]

ok,<Jetson_Xavier_NX_Pinmux_Configuration_Template_v1.06>

so,echo 211 > export in /sys/class/gpio?
write error?

echo 436 > export,why is PQ.01? this what?

How to operate it？

[WayneWWW]

抱歉看不太懂您的英文.

請問你到底想要改哪個gpio?

[lvyefeng666]

gpio-9

[WayneWWW]

Hi,

跟你說明一下pinmux欄位上的意義. 你好像搞錯了
GPIO9 → pin的名字
211 → 這根pin在module上的物理編號. 跟軟體使用上完全沒有關聯
GPIO3_PS.04 → 代表這根pin對應的gpio是 PS.04. 不知道你的PQ.01哪來的. 那應該是別根

操作GPIO的方法

1. 先去Jetson上看你的gpio編號是幾號

sudo -s
root@tegra-ubuntu:/home/nvidia# cat /sys/kernel/debug/gpio |grep PS
 gpio-449 (PS.00               )
 gpio-450 (PS.01               )
 gpio-451 (PS.02               )
 gpio-452 (PS.03               )
 gpio-453 (PS.04               )  -> 這根是你要的
 gpio-454 (PS.05               )
 gpio-455 (PS.06               )
 gpio-456 (PS.07               )

2. 從(1)得知PS04對應號碼是453, 去/sys/class/gpio 將它export出來
   echo 453 > /sys/class/gpio

3. 進去gpiochip453目錄進行操作

[lvyefeng666]

Oh, my god,
This is just what I wanted.
Thank you.