libgpiod

使用以下设置将 libgpiod 和从属库调用图像：

IMAGE_INSTALL:append = " libgpiod libgpiod-dev libgpiod-tools"

登录到您的定制嵌入式系统或通过 SSH 连接。现在，您可以使用 libgpiod 命令，查看实现是否成功。#### 报告 gpio banks

首先，您需要检测安装了多少 gpio bank。使用以下命令：

gpiodetect

输出应该是这个样子：

gpiochip0 [gpio0] (32 lines)
gpiochip1 [gpio1] (32 lines)
gpiochip2 [gpio2] (32 lines)
gpiochip3 [gpio3] (32 lines)
gpiochip4 [gpio4] (32 lines)

获取所有设置

要获取所有设置，请使用以下命令：

gpioinfo

输出应该是这个样子：

gpiochip0 - 32 lines:
	line   0:      unnamed       unused   input  active-high 
	... 
	line   4:      unnamed "host-wakeup" input active-high [used]
	line   5:      unnamed       unused   input  active-high 
	line   6:      unnamed       unused   input  active-high 
	line   7:      unnamed         "cd"   input   active-low [used]
	line   8:      unnamed       unused   input  active-high 
	line   9:      unnamed   "shutdown"  output  active-high [used]
	line  10:      unnamed      "reset"  output   active-low [used]
	...
gpiochip1 - 32 lines:
	line   0:      unnamed       unused   input  active-high 
	... 
	line  31:      unnamed       unused   input  active-high 
gpiochip2 - 32 lines:
	line   0:      unnamed       unused   input  active-high 
	...
	line  31:      unnamed       unused   input  active-high 
gpiochip3 - 32 lines:
	line   0:      unnamed       unused   input  active-high 
	...
	line  31:      unnamed       unused   input  active-high 
gpiochip4 - 32 lines:
	line   0:      unnamed       unused   input  active-high 
	...
	line  29:   "GPIO4_D5"       unused   input  active-high 

设置一个 GPIO 命令行

要将 gpiochip4 上的 GPIO 第 29 行设置为输出和高，请使用以下命令：

gpioset gpiochip4 29=1

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本项目源代码根据 GPL-3.0 许可证获得许可。