openSUSE:GPIO
为了管理 GPIO ，您可以使用 'libgpiod' 包里的工具，适用于内核版本 >= 4.8，包括 Leap 15.0+ 和 Tumbleweed。 您也可以使用弃用的 'sysfs' 接口。
目录
libgpiod
安装
为了安装 libgpiod，只需要从主 OSS 仓库安装。 对于 Leap 15.0，您需要从 'hardware' 仓库进行安装。 也可以通过一键安装 : https://software.opensuse.org/package/libgpiod
检测 GPIO: gpiodetect
gpiodetect 将会列出所有 GPIO 芯片，打印它们的标签，以及 GPIO 行编号。
gpiodetect
RPi2 返回:
gpiochip0 [pinctrl-bcm2835] (54 ines)
获取当前 GPIO 信息: gpioinfo
gpioinfo gpiochip0
将会列出所有指定 gpio芯片 行（这里，为 gpiochip0），他们的名称，提供者，方向，激活状态，以及其他标志。 对于 RPi2, 返回:
gpiochip0 - 54 lines:
line 0: unnamed unused input active-high
line 1: unnamed unused input active-high
line 2: unnamed unused input active-high
line 3: unnamed unused input active-high
line 4: unnamed unused input active-high
line 5: unnamed unused input active-high
line 6: unnamed unused input active-high
line 7: unnamed unused input active-high
line 8: unnamed unused input active-high
line 9: unnamed unused input active-high
line 10: unnamed unused input active-high
line 11: unnamed unused input active-high
line 12: unnamed unused input active-high
line 13: unnamed unused input active-high
line 14: unnamed unused input active-high
line 15: unnamed unused input active-high
line 16: unnamed unused input active-high
line 17: unnamed unused input active-high
line 18: unnamed unused input active-high
line 19: unnamed unused input active-high
line 20: unnamed unused input active-high
line 21: unnamed unused input active-high
line 22: unnamed unused input active-high
line 23: unnamed unused input active-high
line 24: unnamed unused input active-high
line 25: unnamed unused input active-high
line 26: unnamed unused input active-high
line 27: unnamed unused input active-high
line 28: unnamed unused input active-high
line 29: unnamed unused input active-high
line 30: unnamed unused input active-high
line 31: unnamed unused input active-high
line 32: unnamed unused input active-high
line 33: unnamed unused input active-high
line 34: unnamed unused input active-high
line 35: unnamed "led1" output active-high [used]
line 36: unnamed unused input active-high
line 37: unnamed unused input active-high
line 38: unnamed unused input active-high
line 39: unnamed unused input active-high
line 40: unnamed unused input active-high
line 41: unnamed unused input active-high
line 42: unnamed unused input active-high
line 43: unnamed unused input active-high
line 44: unnamed unused input active-high
line 45: unnamed unused input active-high
line 46: unnamed unused input active-high
line 47: unnamed "led0" output active-high [used]
line 48: unnamed unused input active-high
line 49: unnamed unused input active-high
line 50: unnamed unused input active-high
line 51: unnamed unused input active-high
line 52: unnamed unused input active-high
line 53: unnamed unused input active-high
读取值 (输入): gpioget
gpioget gpiochip0 4
将读取 gpiochip0 的 gpio 4 状态值，将会返回:
1
gpioget gpiochip0 4 5
将会读取 gpio 4 和 5 状态值，将会返回:
1 1
写入值 (输出): gpioset
gpioset --mode=wait gpiochip0 4=1
将会设置 GPIO 4 的状态值为 1 并且将会停止设置该值，直到您键入 ctrl-c。
gpioset --mode=wait gpiochip0 4=1 5=0
将会设置 GPIO 4 状态值为 1，以及 GPIO 5 状态值为 0，直到您键入 ctrl-c 退出，并停止设置值。
使用 --mode= 参数，您可以等待退出前 ctrl-c (如上述)，等待一个信号，或者一些时间 (然后释放 GPIO)。
The release of the GPIO may reset it to an high-impedance (unconnected) state or leave the last value. It depends on the GPIO chip. Most SoC GPIO will reset to high impedance, whereas I2C GPIO chips will keep the last value set.
libgpiod 绑定 (C++ 和 Python)
You can use C++ binding. Examples are provided here: https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/tree/bindings/cxx/examples
For Python binding, you need to install python-libgpiod. Examples are here: https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/tree/bindings/python/examples
python3-gpiod
python3-gpiod package contains the python binding from libgpiod to access GPIO from python3.
安装
To install python3-gpiod, you just need to use zypper or YaST as it is part of openSUSE distributions repositories.
One click installation is also available : https://software.opensuse.org/package/python3-gpiod
示例
You have lots of example on https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/tree/bindings/python/examples:
sysfs 接口 (弃用)
这是旧的 (弃用) 接口仍然可用。
导出: 获取 GPIO 访问权限
echo 229 > /sys/class/gpio/export
将会获取 GPIO 229 访问权限。
Note that the base, which is the N from /sys/class/gpio/gpiochipN, must be added to the GPIO number. This is never mentioned because on Raspbian N is 0.
There may be more than one chip providing GPIO. Try looking in /sys/class/gpio/gpiochipN/label to find out which is which.
方向: 选择输入/输出模式引脚
echo in > /sys/class/gpio/gpio229/direction
将会设置 GPIO 229 为输入模式。
echo out > /sys/class/gpio/gpio229/direction
将会设置 GPIO 229 位输出模式，如此初始状态值为 0，如果使用 high 设置输出模式，默认值为 1。
值: 读/写 值
cat /sys/class/gpio/gpio229/value
将会获取当前 GPIO 229 状态值。
echo 1 > /sys/class/gpio/gpio229/value
将会设置 GPIO 229 状态值为 1。
取消导出: 释放 GPIO 访问
完成后，将会释放 GPIO 访问权限:
echo 229 > /sys/class/gpio/unexport