How to check the GPIO pinmux of Orin NX and set the GPIO pinmux?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
1

Hi:
Here is my device version:

Software part of jetson-stats 4.3.2 - (c) 2024, Raffaello Bonghi
Model: NVIDIA Orin NX Developer Kit - Jetpack 5.1.3 [L4T 35.5.0]
NV Power Mode[2]: 15W
Serial Number: [XXX Show with: jetson_release -s XXX]
Hardware:
 - P-Number: p3767-0001
 - Module: NVIDIA Jetson Orin NX (8GB ram)
Platform:
 - Distribution: Ubuntu 20.04 focal
 - Release: 5.10.192-tegra
jtop:
 - Version: 4.3.2
sh: 0: getcwd() failed: Input/output error
 - Service: Active
Libraries:
 - CUDA: 11.4.315
 - cuDNN: 8.6.0.166
 - TensorRT: 8.5.2.2
 - VPI: 2.4.8
 - Vulkan: 1.3.204
 - OpenCV: 4.5.4 - with CUDA: NO

We designed our own hardware,now I need to set the used pins to GPIO, Download and to check Jetson_Orin_NX_and_Orin_Nano_series_Pinmux_Config_Template.xlsm,I choose to set SPI0_CS1/SPI1_CS0/SPI1_CS1 to gpio:

nx
nx1673×381 78.5 KB

Then I checked gpio config file :tegra234-mb1-bct-gpio-p3767-hdmi-a03.dtsi:

gpio@2200000 {
		gpio-init-names = "default";
		gpio-init-0 = <&gpio_main_default>;

		gpio_main_default: default {
			gpio-input = <
				TEGRA234_MAIN_GPIO(B, 0)
				TEGRA234_MAIN_GPIO(Y, 0)
				TEGRA234_MAIN_GPIO(Y, 1)
				TEGRA234_MAIN_GPIO(Y, 2)
				TEGRA234_MAIN_GPIO(Y, 3)
				TEGRA234_MAIN_GPIO(Y, 4)
				TEGRA234_MAIN_GPIO(Z, 1)
				TEGRA234_MAIN_GPIO(Z, 3)
				TEGRA234_MAIN_GPIO(Z, 4)
				TEGRA234_MAIN_GPIO(Z, 5)
				TEGRA234_MAIN_GPIO(Z, 6)
				TEGRA234_MAIN_GPIO(Z, 7)
				TEGRA234_MAIN_GPIO(P, 6)
				TEGRA234_MAIN_GPIO(Q, 5)
				TEGRA234_MAIN_GPIO(Q, 6)
				TEGRA234_MAIN_GPIO(R, 4)
				TEGRA234_MAIN_GPIO(R, 5)
				TEGRA234_MAIN_GPIO(M, 0)
				TEGRA234_MAIN_GPIO(N, 1)
				TEGRA234_MAIN_GPIO(G, 0)
				TEGRA234_MAIN_GPIO(G, 6)
				TEGRA234_MAIN_GPIO(G, 7)
				TEGRA234_MAIN_GPIO(H, 0)
				TEGRA234_MAIN_GPIO(H, 7)
				TEGRA234_MAIN_GPIO(I, 0)
				TEGRA234_MAIN_GPIO(I, 1)
				TEGRA234_MAIN_GPIO(I, 2)
				TEGRA234_MAIN_GPIO(AC, 6)
				TEGRA234_MAIN_GPIO(L, 2)
				>;
			gpio-output-low = <
				TEGRA234_MAIN_GPIO(H, 6)
				TEGRA234_MAIN_GPIO(I, 5)
				TEGRA234_MAIN_GPIO(AC, 0)
				TEGRA234_MAIN_GPIO(K, 4)
				TEGRA234_MAIN_GPIO(K, 5)
				>;
			gpio-output-high = <
				TEGRA234_MAIN_GPIO(Q, 3)
				TEGRA234_MAIN_GPIO(A, 0)
				>;
		};
	};

I don’t know which configuration in the config file corresponds to GPIO3_PY.03. If I set GPIO3_PY.03 as GPIO output and the default low level, how should I configure it?
And how can I check the pin reuse configuration on the device? Is there any command to confirm the configuration of the pin taking effect?
Looking forward to your reply!

3

Hi jack.yan,

Please just configure it as GPIO3_PY.03/Output/Drive 0 in pinmux spreadsheet.

Please use sysfs command to export the pin and check its state.

$ sudo su
# cat /sys/kernel/debug/gpio | grep PY.03
# echo xxx > /sys/class/gpio/export
# cd /sys/class/gpio/PY.03
# cat direction
# cat value

Or you can use gpiod to check:


$ sudo gpioinfo|grep "PY.03"
4

Dear KevinFFF:
Thank you very much for your reply. I want to quickly verify whether these pins can be reused as GPIO. Now I logging in to the Ubuntu desktop. Is there any way to quickly set them in the command line for verification?

I Modified Jetson_Orin_NX_and_Orin_Nano_series_Pinmux_Config_Template.xlsm and generate DT file again, and then compare with default dtsi file ,The differences are as follows：

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nx2160×1305 252 KB

For the generated file, I will change the file name to tegra234-mb1-bct-gpio-p3767-hdmi-a03.dtsi, replace it in the Linux_for_Tegra/bootloader directory, and then burn all partition by l4t_initrd_flash.sh? Can I directly copy this file to the device for replacement, and restart the device to take effect?

If I want to set GPIO to interrupt, do I only need to set GPIO to GPIO3_PY.03/Input/int PU(int PD)?