Nano GPIO USE need help

[caodingrui]

I am trying to use Nano GPIO in my customed carrier board. There are GPIO4 GPIO3_PI.01 pin127；GPIO5 GPIO3_PH.07 pin128；GPIO6 GPIO3_PI.00 pin130. I what to use them as output pins.
I refered to two posts,and I both failed.
Firstly .I tried this posts way ,try to get the gpio num.

我使用的是NVIDIA JETSON ORIN NANO ，我用到了gpio05 ,gpio03 ,gpio02，我想再UBUNTU上操控这几个引脚，我怎么计算gpio对应的编号

請你先用pinmux spreadsheet查詢這幾根GPIOxx對應的是GPIO英文順序的哪幾根pin. 再去系統上 sudo cat /sys/kernel/debug/gpio 就能知道是幾號了.

I cannot find the gpio-num in the following commands.

root@nvidia:/sys/class/gpio/gpiochip0# sudo cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-255, parent: platform/6000d000.gpio, tegra-gpio:
 gpio-0   (                    )
 gpio-1   (                    )
 gpio-2   (                    |pcie_wake           ) in  hi
 gpio-3   (                    )
 gpio-4   (                    )
 gpio-5   (                    )
 gpio-6   (                    |system-suspend-gpio ) out hi
 gpio-7   (                    )
 gpio-8   (                    )
 gpio-9   (                    )
 gpio-10  (                    )
 gpio-11  (                    )
 gpio-12  (SPI1_MOSI           )
 gpio-13  (SPI1_MISO           )
 gpio-14  (SPI1_SCK            )
 gpio-15  (SPI1_CS0            )
 gpio-16  (SPI0_MOSI           )
 gpio-17  (SPI0_MISO           )
 gpio-18  (SPI0_SCK            )
 gpio-19  (SPI0_CS0            )
 gpio-20  (SPI0_CS1            )
 gpio-21  (                    )
 gpio-22  (                    )
 gpio-23  (                    )
 gpio-24  (                    )
 gpio-25  (                    )
 gpio-26  (                    )
 gpio-27  (                    )
 gpio-28  (                    )
 gpio-29  (                    )
 gpio-30  (                    )
 gpio-31  (                    )
 gpio-32  (                    )
 gpio-33  (                    )
 gpio-34  (                    )
 gpio-35  (                    )
 gpio-36  (                    )
 gpio-37  (                    )
 gpio-38  (GPIO13              )
 gpio-39  (                    )
 gpio-40  (                    )
 gpio-41  (                    )
 gpio-42  (                    )
 gpio-43  (                    )
 gpio-44  (                    )
 gpio-45  (                    )
 gpio-46  (                    )
 gpio-47  (                    )
 gpio-48  (                    )
 gpio-49  (                    )
 gpio-50  (UART1_RTS           )
 gpio-51  (UART1_CTS           )
 gpio-52  (                    )
 gpio-53  (                    )
 gpio-54  (                    )
 gpio-55  (                    )
 gpio-56  (                    )
 gpio-57  (                    )
 gpio-58  (                    )
 gpio-59  (                    )
 gpio-60  (                    )
 gpio-61  (                    )
 gpio-62  (                    )
 gpio-63  (                    )
 gpio-64  (                    |i2c-mux-gpio        ) out hi
 gpio-65  (                    |?                   ) out hi
 gpio-66  (                    )
 gpio-67  (                    )
 gpio-68  (                    )
 gpio-69  (                    )
 gpio-70  (                    )
 gpio-71  (                    )
 gpio-72  (                    )
 gpio-73  (                    )
 gpio-74  (                    )
 gpio-75  (                    )
 gpio-76  (I2S0_FS             )
 gpio-77  (I2S0_DIN            )
 gpio-78  (I2S0_DOUT           )
 gpio-79  (I2S0_SCLK           )
 gpio-80  (                    )
 gpio-81  (                    )
 gpio-82  (                    )
 gpio-83  (                    )
 gpio-84  (                    )
 gpio-85  (                    )
 gpio-86  (                    )
 gpio-87  (                    )
 gpio-88  (                    )
 gpio-89  (                    )
 gpio-90  (                    )
 gpio-91  (                    )
 gpio-92  (                    )
 gpio-93  (                    )
 gpio-94  (                    )
 gpio-95  (                    )
 gpio-96  (                    )
 gpio-97  (                    )
 gpio-98  (                    )
 gpio-99  (                    )
 gpio-100 (                    )
 gpio-101 (                    )
 gpio-102 (                    )
 gpio-103 (                    )
 gpio-104 (                    )
 gpio-105 (                    )
 gpio-106 (                    )
 gpio-107 (                    )
 gpio-108 (                    )
 gpio-109 (                    )
 gpio-110 (                    )
 gpio-111 (                    )
 gpio-112 (                    )
 gpio-113 (                    )
 gpio-114 (                    )
 gpio-115 (                    )
 gpio-116 (                    )
 gpio-117 (                    )
 gpio-118 (                    )
 gpio-119 (                    )
 gpio-120 (                    )
 gpio-121 (                    )
 gpio-122 (                    )
 gpio-123 (                    )
 gpio-124 (                    |sysfs               ) out hi
 gpio-125 (                    )
 gpio-126 (                    )
 gpio-127 (                    )
 gpio-128 (                    )
 gpio-129 (                    )
 gpio-130 (                    )
 gpio-131 (                    )
 gpio-132 (                    )
 gpio-133 (                    )
 gpio-134 (                    )
 gpio-135 (                    )
 gpio-136 (                    )
 gpio-137 (                    )
 gpio-138 (                    )
 gpio-139 (                    )
 gpio-140 (                    )
 gpio-141 (                    )
 gpio-142 (                    )
 gpio-143 (                    )
 gpio-144 (                    )
 gpio-145 (                    )
 gpio-146 (                    )
 gpio-147 (                    )
 gpio-148 (                    )
 gpio-149 (GPIO01              )
 gpio-150 (                    )
 gpio-151 (                    )
 gpio-152 (                    )
 gpio-153 (                    )
 gpio-154 (                    )
 gpio-155 (                    )
 gpio-156 (                    )
 gpio-157 (                    )
 gpio-158 (                    )
 gpio-159 (                    )
 gpio-160 (                    )
 gpio-161 (                    )
 gpio-162 (                    )
 gpio-163 (                    )
 gpio-164 (                    )
 gpio-165 (                    )
 gpio-166 (                    )
 gpio-167 (                    )
 gpio-168 (GPIO07              )
 gpio-169 (                    )
 gpio-170 (                    )
 gpio-171 (                    )
 gpio-172 (                    )
 gpio-173 (                    )
 gpio-174 (                    )
 gpio-175 (                    )
 gpio-176 (                    )
 gpio-177 (                    )
 gpio-178 (                    )
 gpio-179 (                    )
 gpio-180 (                    )
 gpio-181 (                    )
 gpio-182 (                    )
 gpio-183 (                    )
 gpio-184 (                    )
 gpio-185 (                    )
 gpio-186 (                    )
 gpio-187 (                    )
 gpio-188 (                    )
 gpio-189 (                    |Power               ) in  hi IRQ
 gpio-190 (                    |Forcerecovery       ) in  hi IRQ
 gpio-191 (                    )
 gpio-192 (                    )
 gpio-193 (                    )
 gpio-194 (GPIO12              )
 gpio-195 (                    )
 gpio-196 (                    )
 gpio-197 (                    )
 gpio-198 (                    )
 gpio-199 (                    )
 gpio-200 (GPIO11              )
 gpio-201 (                    )
 gpio-202 (                    |pwm-fan-tach        ) in  hi IRQ
 gpio-203 (                    |vdd-3v3-sd          ) out lo
 gpio-204 (                    )
 gpio-205 (                    )
 gpio-206 (                    )
 gpio-207 (                    )
 gpio-208 (                    )
 gpio-209 (                    )
 gpio-210 (                    )
 gpio-211 (                    )
 gpio-212 (                    )
 gpio-213 (                    )
 gpio-214 (                    )
 gpio-215 (                    )
 gpio-216 (GPIO09              )
 gpio-217 (                    )
 gpio-218 (                    )
 gpio-219 (                    )
 gpio-220 (                    )
 gpio-221 (                    )
 gpio-222 (                    )
 gpio-223 (                    )
 gpio-224 (                    )
 gpio-225 (                    |hdmi2.0_hpd         ) in  hi IRQ
 gpio-226 (                    )
 gpio-227 (                    )
 gpio-228 (                    |extcon:extcon@1     ) in  hi IRQ
 gpio-229 (                    )
 gpio-230 (                    )
 gpio-231 (                    |?                   ) out hi
 gpio-232 (SPI1_CS1            )
 gpio-233 (                    )
 gpio-234 (                    )
 gpio-235 (                    )
 gpio-236 (                    )
 gpio-237 (                    )
 gpio-238 (                    )
 gpio-239 (                    )

gpiochip1: GPIOs 504-511, parent: platform/max77620-gpio, max77620-gpio, can sleep:
 gpio-505 (                    |spmic-default-output) out hi
 gpio-507 (                    |vdd-3v3-sys         ) out hi
 gpio-510 (                    |enable              ) out lo
 gpio-511 (                    |avdd-io-edp-1v05    ) out lo

I also tried this posts way ,and I encountered a error.

How to control GPIO on Jetson_nano_emmc?

Hi CN_MKLS_YUAN, If you want to just set them from terminal maybe you can use these commands: sudo sh -c "echo 124 > /sys/class/gpio/export" sudo sh -c "echo out > /sys/class/gpio/gpio124/direction" sudo sh -c "echo 1 > /sys/class/gpio/gpio124/value" # High sudo sh -c "echo 0 > /sys/class/gpio/gpio124/value" # Low You can check the status of the GPIOs using: sudo cat /sys/kernel/debug/gpio Regards, Roberto,

root@nvidia:/sys/devices/6000d000.gpio/gpio/gpiochip0# echo 127 > export
bash: export: Permission denied
root@nvidia:/sys/devices/6000d000.gpio/gpio/gpiochip0# echo PI.01 >export
bash: export: Permission denied

What should I do now?
Thanks.

[caodingrui]

GPIO Mapping on the Nano

Hi,thopkins You can find the mapping relationship of GPIO in the kernel source code. <PATH>/sources/kernel/kernel-4.9/include/dt-bindings/gpio/tegra-gpio.h #define TEGRA_GPIO_PORT_A 0 #define TEGRA_GPIO_PORT_B 1 #define TEGRA_GPIO_PORT_C 2 #define TEGRA_GPIO_PORT_D 3 #define TEGRA_GPIO_PORT_E 4 #define TEGRA_GPIO_PORT_F 5 #define TEGRA_GPIO_PORT_G 6 <b>#define TEGRA_GPIO_PORT_H 7</b> #define TEGRA_GPIO_PORT_I 8 #define TEGRA_GPIO_PORT_J 9 #define TEGRA_GPIO_PORT_K 10 #define TEGRA_GPIO_PORT_L…

According to this post,
GPIO04 is GPIO3_PI.01,and it should be 8*8+1=65.
But I cannot use it.

root@nvidia:/sys/devices/6000d000.gpio/gpio/gpiochip0# echo 65 >export
bash: export: Permission denied

[WayneWWW]

My first question is are you asking on Orin Nano or Jetson nano…?

These two are different and if you are using jetson nano, you cannot refer to the orin nano post…

[caodingrui]

I am using a Jetson Nano. I thought the gpio commands are all the same,

[WayneWWW]

1. Jetson nano is k4.9 kernel which does not support to directly export GPIO by using something like PX.xx directly. Only gpio number is allowed.

2. To export GPIO, you should go to /sys/class/gpio but not /sys/devices/6000d000.gpio/.

3. To calculate gpio number, you need to use https://github.com/torvalds/linux/blob/master/include/dt-bindings/gpio/tegra-gpio.h to calculate.

[caodingrui]

GPIO04 is GPIO3_PI.01,and it should be 8*8+1=65.
But there is a new error .

root@nvidia:/sys/class/gpio# echo 65 > export
bash: echo: write error: Device or resource busy

[WayneWWW]

In your /sys/kernel/debug/gpio 65 is already in use by other driver. So you cannot export it.

[caodingrui]

This means I cannot use the sysfs way to use it?
I am looking at GitHub - NVIDIA/jetson-gpio: A Python library that enables the use of Jetson’s GPIOs .Can I use it to change the gpio states in cases of this?

[WayneWWW]

Actually you should check why there is another driver occupied the GPIO you want to use.

It does not matter sysfs or jetson-gpio. If you don’t remove that driver, then nothing can help you configure that gpio pin.