# GPIO接口

## GPIO描述

| 接口名称     | PHD2.0针脚序号 | 信号定义    | GPIO号          |
| ------------ | -------------- | ----------- | ----------------- |
| GPIO_222_3V3 | 2Pin/DO        | GPIO222_3V3 | gpio460		 |
| GPIO_220_3V3 | 4Pin/DO        | GPIO220_3V3 | gpio459 	|
| GPIO_197_3V3 | 8Pin/DI        | GPIO197_3V3 | gpio465 	|
| GPIO_226_3V3 | 10Pin/DI       | GPIO226_3V3 | gpio458  	|
| ISO_GND      | 6Pin	        | ISO_GND     | 隔离--GND地信号       |


| DI Vin 电压范围 | 结果               |
| --------------- | ------------------ |
| 2V～5V          | 高电平=1           |
| 0V～1V          | 低电平=0           |
| > 5V 或者 < 0 V | 不支持且会破坏硬件 |

| DO Vout结果 |      |
| -------- | ---- |
| 高电平=1 | 3.3V |
| 低电平=0 | 0V   |

F305L的IO接口采用了隔离电源IO，其中2路仅用作输出IO（Pin2/Pin4），2路仅用作输入IO（Pin8/Pin10）。IO为经过隔离的GPIO，GND也需要接入其独立的ISO_GND（隔离GND），实际应用时输入和输出需采用Pin6作为GND。



### JetPack5.x配置

对GPIO接口使用的示例如下，请将<xxx >中的信息修改为想要调整的GPIO节点代号

```shell
#切换到root用户

sudo su –
cd /sys/class/gpio
echo gpio_num > export
Note:在JetPack5.x 上，exprot gpio_num 生成的是一个yyyy名字，而不是JetPack4.x 之前的gpionum 形式

# 设置为高电平(DO)
echo 1 > /sys/class/gpio/xxxx/value

# 设置为低电平(DO)
echo 0 > /sys/class/gpio/xxx/value

# 读取数据(DI)
cat /sys/class/gpio/xxxx/value

# 设置输入输出方向(DIRCTION)
$echo in > /sys/class/gpio/xxxx/direction
$echo out > /sys/class/gpio/xxx/direction
```

若需要关机后保留配置，可以将以上命令写入/etc/rc.local 文件



## JetPack6.x配置

```bash
#JetPack6.x -- DO/DI
sudo gpioset -m wait /dev/gpiochip0 6=0 #DO1 拉高，默认为高3.7V
sudo gpioset -m wait /dev/gpiochip0 6=1 #DO1 拉低为0V，停止后恢复3.7V

sudo gpioset -m wait /dev/gpiochip0 5=0 #DO2 拉高，默认为高3.7V
sudo gpioset -m wait /dev/gpiochip0 5=1 #DO2 拉低为0V，停止后恢复3.7V

#JetPack6.x -- DI
#DI&DO 短路 测量信号电平，短接如果DO设置低，则短接后DI/DO均为0V，如果DO设置为高，则短接后DI/DO均为0.9V左右
#DI1 --短接-- DO1 
sudo gpioset -m wait /dev/gpiochip0 6=0 -> #DO输出高电平，DI实际测量为0.9V，读取状态为非High

#DTSI 配置GPIO模式需要正确 tegra234-p3767-0000-f305-board.dts
i2s4-sck {
	nvidia,pins = "dap4_sclk_pa4";
	nvidia,function = "rsvd2";
	nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
	nvidia,tristate = <TEGRA_PIN_DISABLE>;
	nvidia,enable-input = <TEGRA_PIN_ENABLE>;
	nvidia,lpdr = <TEGRA_PIN_DISABLE>;
};
gpio44 {
	nvidia,pins = "soc_gpio44_pi2";
	nvidia,function = "rsvd2";
	nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
	nvidia,tristate = <TEGRA_PIN_DISABLE>;
	nvidia,enable-input = <TEGRA_PIN_ENABLE>;
	nvidia,lpdr = <TEGRA_PIN_DISABLE>;
};
i2s4-din {
	nvidia,pins = "dap4_din_pa6";
	nvidia,function = "rsvd2";
	nvidia,pull = <TEGRA_PIN_PULL_NONE>;
	nvidia,tristate = <TEGRA_PIN_DISABLE>;
	nvidia,enable-input = <TEGRA_PIN_DISABLE>;
	nvidia,lpdr = <TEGRA_PIN_DISABLE>;
};
i2s4-dout {
	nvidia,pins = "dap4_dout_pa5";
	nvidia,function = "rsvd2";
	nvidia,pull = <TEGRA_PIN_PULL_NONE>;
	nvidia,tristate = <TEGRA_PIN_DISABLE>;
	nvidia,enable-input = <TEGRA_PIN_DISABLE>;
	nvidia,lpdr = <TEGRA_PIN_DISABLE>;
};
```




![](../img/multi.io.png)