树莓派运行python操作串口发送AT命令程序

ATZ是恢复出厂设置

AT&W 是保存设置

`#!/usr/bin/python # -*- coding:utf-8 -*- import RPi.GPIO as GPIO import serial import time  ser = serial.Serial('/dev/ttyS0',115200) ser.flushInput()   def send_at(command,back,timeout):     rec_buff = ''     ser.write((command+'\r\n').encode())     time.sleep(timeout)     if ser.inWaiting():         time.sleep(0.5)#目测是这里之前太快了，导致没来得及读取返回命令         rec_buff = ser.read(ser.inWaiting())     if rec_buff != '':         if back not in rec_buff.decode():             print(command + ' ERROR')             print(command + ' back:\t' + rec_buff.decode())             return 0         else:             str_4g=rec_buff.decode()             print(rec_buff.decode())             # if len(str_4g)>50:             #     print(float(str_4g[25:27])+float(str_4g[27:36])/60)             #     print(float(str_4g[39:42])+float(str_4g[42:51])/60)             return 1     else:         print('4G is not ready')         return 0 def get_call():     # AT$QCRMCALL=1,1      send_at('AT$QCRMCALL=1,1','OK',1)  # 执行程序 try:     # 进行拨号     get_call() except:     if ser != None:         ser.close() if ser != None:         ser.close()`

下面的比上面的效果好

`import serial  class AtCommand:     def __init__(self):         self.ser = None      def open(self, port, rd_timeout=1):         # Open searil port         self.ser = serial.Serial(port,115200, timeout=rd_timeout)      def close(self):         # Close searil port         self.ser.close()      def send_at(self, cmd):         cmd_ex = cmd + '\r\n'         print 'Sending ' + cmd + ' ...'         self.ser.write(cmd_ex)      def check_at_resp(self, exp_str, max_size=200):         '''         It reads AT response and checks if there is any error.         All AT response string will be returned if no error, otherwise         None will be returned.         '''         ret = self.ser.read_until(exp_str + '\r\n', max_size)         if not exp_str in ret:             print "Actual AT response is: ", ret, "\nBut expected response is: ", exp_str             ret = None         return ret      def parse_at_resp(self, targ_str, at_resp):         '''         It extracts the line including target string, then return the string after target string         at the same line.         None will be returned in case of any error         '''         for cur_line in at_resp.split('\r\n'):             if targ_str in cur_line:                 # Remove leading and trailing whitespace chars and target string                 return cur_line.replace(targ_str, '').strip()         else:             return None if __name__ == "__main__":     test_at = AtCommand()     test_at.open('/dev/ttyS0')     test_at.send_at('AT')     print test_at.check_at_resp('OK')`