16002.orin nano平台 linux gpio 学习记录

文章目录

1 查看当前系统gpio配置信息
2 orin / nano gpio
- 2.1 GPIO 映射表
- 2.2 nano 平台对外提供的2排端口表
3 配置GPIO 电平
- 3.1 通过指令配置普通GPIO高电平
- 3.2 通过设备树配置普通GPIO高电平
- 3.3 配置特定 gpio 高电平

1 查看当前系统gpio配置信息

sudo cat /sys/kernel/debug/gpio

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2 orin / nano gpio

2.1 GPIO 映射表

orin 平台提供了一个 xls 表，可通过它生成dtb 设备树，同样可以看到管脚的定义:

Jetson_Orin_NX_and_Orin_Nano_series_Pinmux_Config_Template.xlsm

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2.2 nano 平台对外提供的2排端口表

https://jetsonhacks.com/nvidia-jetson-orin-nano-gpio-header-pinout/
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3 配置GPIO 电平

3.1 通过指令配置普通GPIO高电平

配置gpio 9为高电平

nano@orin-nano:/sys/class/gpio$ sudo -s
[sudo] password for nano: 
root@orin-nano:/sys/class/gpio# echo 492 > /sys/class/gpio/export    
root@orin-nano:/sys/class/gpio# ls
export  gpiochip316  gpiochip348  PAC.06  unexport

root@orin-nano:/sys/class/gpio/PAC.06# echo out > direction 
root@orin-nano:/sys/class/gpio/PAC.06# echo 1 > value
root@orin-nano:/sys/class/gpio/PAC.06#

cat /sys/kernel/debug/gpio

3.2 通过设备树配置普通GPIO高电平

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3.3 配置特定 gpio 高电平

AON 特定管脚，使用的宏， GPIO6 代表的就是 CC , 3

/** Copyright (c) 2022, NVIDIA CORPORATION.  All rights reserved.** This program is free software; you can redistribute it and/or modify* it under the terms of the GNU General Public License as published by* the Free Software Foundation; either version 2 of the License, or* (at your option) any later version.** This program is distributed in the hope that it will be useful, but WITHOUT* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for* more details.** You should have received a copy of the GNU General Public License* along with this program.  If not, see <http://www.gnu.org/licenses/>.*/#include "tegra234-camera-rbpcv3-imx477.dtsi"#define CAM0_PWDN	TEGRA234_MAIN_GPIO(H, 6)
#define CAM1_PWDN	TEGRA234_MAIN_GPIO(AC, 0)
#define CAM_I2C_MUX 	TEGRA234_AON_GPIO(CC, 3)/ {cam_i2cmux {compatible = "i2c-mux-gpio";#address-cells = <1>;#size-cells = <0>;mux-gpios = <&tegra_aon_gpio CAM_I2C_MUX GPIO_ACTIVE_HIGH>;i2c-parent = <&cam_i2c>;i2c@0 {reg = <0>;#address-cells = <1>;#size-cells = <0>;rbpcv3_imx477_a@1a {status = "disabled";reset-gpios = <&tegra_main_gpio CAM0_PWDN GPIO_ACTIVE_HIGH>;};};i2c@1 {reg = <1>;#address-cells = <1>;#size-cells = <0>;rbpcv3_imx477_c@1a {status = "disabled";reset-gpios = <&tegra_main_gpio CAM1_PWDN GPIO_ACTIVE_HIGH>;};};};gpio@6000d000 {camera-control-output-low {gpio-hog;output-low;gpios = < CAM1_PWDN 0  CAM0_PWDN 0>;label = "cam1-pwdn", "cam0-pwdn";};};
};