Raspbian上的Rpi.GPIO库是可以在普通用户下控制树莓派的GPIO的，然而在ArchlinuxARM下，却需要root用户才行，这无疑会引起安全问题，好在RPi.GPIO提供了一个获取权限的脚本：create_gpio_user_permissions.py

然而这个脚本是没法在ArchlinuxARM上直接运行的，因为Archlinux缺少adduser命令。

这个脚本是这样的：

import grpimport subprocessdef ensure_gpiogroup():    try:        grp.getgrnam('gpio')    except KeyError:        print('GPIO group does not exist - creating...')        subprocess.call(['groupadd', '-f', '-r', 'gpio'])        subprocess.call(['adduser', 'pi', 'gpio'])        # in future, also for groups:        #   spi        #   i2c        add_udev_rules()def add_udev_rules():    with open('/etc/udev/rules.d/99-gpio.rules','w') as f:        f.write("""SUBSYSTEM=="bcm2835-gpiomem", KERNEL=="gpiomem", GROUP="gpio", MODE="0660"SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:gpio /sys/class/gpio/export /sys/class/gpio/unexport ; chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport'"SUBSYSTEM=="gpio", KERNEL=="gpio*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:gpio /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value ; chmod 660 /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value'"""")if __name__ == '__main__':    ensure_gpiogroup()

反正很简单，手动搞进去就行了

首先，建一个gpio组：

groupadd -f -r gpio

然后把当前用户（我的用户是yafeng）加入到gpio组

gpasswd -a yafeng gpio

然后建立udev的规则文件：/etc/udev/rules.d/99-gpio.rules

SUBSYSTEM=="bcm2835-gpiomem", KERNEL=="gpiomem", GROUP="gpio", MODE="0660"SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:gpio /sys/class/gpio/export /sys/class/gpio/unexport ; chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport'"SUBSYSTEM=="gpio", KERNEL=="gpio*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:gpio /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value ; chmod 660 /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value'"

然后重启，就可以直接在普通用户下操作GPIO了，经测试，不光Rpi.GPIO库,wiringpi等其他库也可以了