打算用python控制gpio，网上找的都是一些关于树莓派如何操作gpio的文档，只针对树莓派。所以就自己封装一下函数，方便以后使用。在linux上已经生成了和gpio相关的文件，只要对文件进行读取即可。

参考:

在查看这个之前需要对linux文件系统对gpio控制有基本的了解。可以阅读参考文档。

这里封装了简单的函数。

#!/usr/bin/env pythonimport io gpioValue = {'high': 1, 'low': 0}# gpio的几种触发方式NONE    = 'none'RISING  = 'rising'FALLING = 'falling'BOTH    = 'both'# 导出gpio,相当于申请，这样其他程序就不能使用这个gpiodef gpioExport(gpioIndex):    with open('/sys/class/gpio/export', 'wb') as f:        f.write(str(gpioIndex).encode())# 释放gpio，释放之后其他程序才能调用这个gpio口 def gpioUnexport(gpioIndex):    with open('/sys/class/gpio/unexport', 'wb') as f:        f.write(str(gpioIndex).encode())        # 设置输入def setInput(gpioIndex):    with open('/sys/class/gpio/gpio%d/direction' % gpioIndex, 'wb') as f:        f.write('in'.encode())        # 设置输出def setOutput(gpioIndex):    with open('/sys/class/gpio/gpio%d/direction' % gpioIndex, 'wb') as f:        f.write('out'.encode())        # 读取输入值def getInputValue(gpioIndex):    with open('/sys/class/gpio/gpio%d/value' % gpioIndex, 'r+') as f:        return f.read().strip('\n')  # delete the '\n'         # 设置输出的值def setOutputValue(gpioIndex, value):    with open('/sys/class/gpio/gpio%d/value' % gpioIndex, 'wb') as f:        return f.write(str(value).encode())        # 设置gpio触发方式def setEdge(gpioIndex, edge):    with open('/sys/class/gpio/gpio%d/edge' % gpioIndex, 'wb') as f:        f.write(edge.encode())        # 读取gpio的触发方式def getEdge(gpioIndex):    with open('/sys/class/gpio/gpio%d/edge' % gpioIndex, 'r+') as f:        return f.read().strip('\n')        # 读取gpio的值def getGpioValue(gpioIndex):    gpioExport(gpioIndex)    setInput(gpioIndex)    val = getInputValue(gpioIndex)    gpioUnexport(gpioIndex)    return val    # 获取一组GPIO的值，出入的参数是tuple或者list# 返回listdef getGpioValues(gpioTuple):    gpioValues = []    for i in gpioTuple:        gpioExport(i)        setInput(i)        gpioValues.append(getInputValue(i))        gpioUnexport(i)    return gpioValues# 等待gpio触发事件（还未实现）def waitForEdge(gpioIndex):    pass

Tony Liu

2017-6-3, Shenzhen