徐自远的乱七八糟小站 涉及电子，网络，编程，软件使用，机械结构等等方面。

一 Raspberry PI的GPIO

1. 什么是GPIO

2. Raspberry上的GPIO介绍

二Raspberry PI上编程操作GPIO

1. Python操作

(1) 安装环境

a.下载控制GPIO的python库：http://pypi.python.org/pypi/RPi.GPIO/0.3.1a#downloads

b. 在Pi上安装python-dev： sudo apt-get install python-dev

c. 解压并安装python库

tar xvzf RPi.GPIO-0.x.xx.tar.gz

cd RPi.GPIO-0.x.xx

sudo python setup.py install

(2)测试程序

说明：led灯闪烁（分别接pi-01 和pi-11，11作为输出）

import RPi.GPIO as GPIO

import time

def blink(times, delay):

    GPIO.setmode(GPIO.BOARD)

    GPIO.setup(11, GPIO.OUT)

    while times>0:

        if 0==times%2:

            GPIO.output(11, GPIO.HIGH)

        else:

            GPIO.output(11, GPIO.LOW)

        time.sleep(delay)

        times-=1

    return

if __name__ == '__main__':

    blink(20, 1)

(3)测试程序2——远程点亮/关闭相应的led灯

说明：和上个例子不同的就是a)用到了远程控制，即socket通信；b)操作多个led；

究其本质是一样。当然本人之所以要远程控制，只不过是为了以后远程管理更多的外设做个铺垫。

文件1：remoIO.py

Python

import socket import time g_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) def init(ip, port): g_sock.connect((ip, port)) time.sleep(2) return def send(data): g_sock.send(data) return def read(): data = g_sock.recv(1024) return data def end(): g_sock.close() return def _test(ip, port): sock = init(ip, port) send("I am Raspberry Pi\r\n!"); print read(1024); sock.close() return if __name__=='__main__': #_test('192.168.2.1', 9999) import sys if len(sys.argv) == 3: _test(sys.argv[1], int(sys.argv[2])) else: print 'usage:'+sys.argv[0]+' ip port\r\n'

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import socket import time g_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)   def init(ip, port):     g_sock.connect((ip, port))     time.sleep(2)     return   def send(data):     g_sock.send(data)     return   def read():     data = g_sock.recv(1024)     return data   def end():     g_sock.close()     return   def _test(ip, port):     sock = init(ip, port)     send("I am Raspberry Pi\r\n!");     print read(1024);     sock.close()     return   if __name__=='__main__':     #_test('192.168.2.1', 9999)     import sys     if len(sys.argv) == 3:         _test(sys.argv[1], int(sys.argv[2]))     else:         print 'usage:'+sys.argv[0]+' ip  port\r\n'

文件2：blink.py

import RPi.GPIO as GPIO

import time

import remoIO

ip = '192.168.2.12'

port = 8888

def blink(times, delay):

    R=11

    Y=12

    W=15

    GPIO.setmode(GPIO.BOARD)

    GPIO.setup(R, GPIO.OUT)

    GPIO.setup(Y, GPIO.OUT)

    GPIO.setup(W, GPIO.OUT)

    remoIO.init(ip, port)

    remoIO.send('Now, you can input 1,2 or 3 to turnon  the right led:')

    command = ''

    while 1:

        command = remoIO.read()

        if command=='1\n':

            GPIO.output(R, GPIO.LOW)

            time.sleep(2)

            GPIO.output(R, GPIO.HIGH)

            remoIO.send('ok for 1\t')

        elif command=='2\n':

            GPIO.output(Y, GPIO.LOW)

            time.sleep(2)

            GPIO.output(Y, GPIO.HIGH)

            remoIO.send('ok for 2\t')

        elif command=='3\n':

            GPIO.output(W, GPIO.LOW)

            time.sleep(2)

            GPIO.output(W, GPIO.HIGH)

            remoIO.send('ok or 3\t')

        elif command=='quit\n':

            remoIO.send('end remote control!\r\n')

            remoIO.end()

            break

        else:

            remoIO.send('eroor input!\r\n')

    while times>0:

        if 0==times%2:

            GPIO.output(R, GPIO.HIGH)

        else:

            GPIO.output(R, GPIO.LOW)

        time.sleep(delay)

        times-=1

    return

if __name__ == '__main__':

    blink(10, 0.5)