使用python来调试串口

先贴一个定时发送的代码：

import serialimport timeser = serial.Serial('/dev/ttyUSB0', 250000, timeout=1)print ser.isOpen()words="gggggggggggggggg"while (1):        print "send 256x\""+words+"\" to remotes"        startTime = time.time()        times = 256        while (times):                times -= 1                s = ser.write(words)        endTime = time.time()        print "use time: "+str(endTime-startTime)        print ""        time.sleep(5)ser.close()

然后是一些其它的方法：

1. 使用序号打开串口：ser = serial.Serial(0) 。but，怎么确定串口的序号？？？

2. 查看串口的名称，啊哈，用1的方法打开串口后，你可以产看串口的名字：print ser.portstr  

3. 先例化一个实体，再打开：

>>> ser = serial.Serial()>>> ser.baudrate = 19200>>> ser.port = 0>>> serSerial<id=0xa81c10, open=False>(port='COM1', baudrate=19200, bytesize=8, parity='N', stopbits=1, timeout=None, xonxoff=0, rtscts=0)>>> ser.open()>>> ser.isOpen()True>>> ser.close()>>> ser.isOpen()False

4. 读取数据的集中方式

>>> ser = serial.Serial('/dev/ttyS1', 19200, timeout=1)>>> x = ser.read()          # read one byte>>> s = ser.read(10)        # read up to ten bytes (timeout)>>> line = ser.readline()   # read a '/n' terminated line>>> ser.close()

其中，如果只是串口调试，直接ser.read(1000)，这样会把读到的值直接打印到屏幕上。

5.所有参数

ser = serial.Serial(port=None,              # number of device, numbering starts at# zero. if everything fails, the user# can specify a device string, note# that this isn't portable anymore# if no port is specified an unconfigured# an closed serial port object is createdbaudrate=9600,          # baud ratebytesize=EIGHTBITS,     # number of databitsparity=PARITY_NONE,     # enable parity checkingstopbits=STOPBITS_ONE,  # number of stopbitstimeout=None,           # set a timeout value, None for waiting foreverxonxoff=0,              # enable software flow controlrtscts=0,               # enable RTS/CTS flow controlinterCharTimeout=None   # Inter-character timeout, None to disable)

6. exception：serial.SerialException

 

另一个完整收发的例子，单片机数据以TLV（Type，Length，Value）格式发上来

#!/usr/bin/env python
# it's a program of luo, [e-mail]
import serialimport arrayimport osimport signalfrom time import sleepflag_stop = Falsedef onsignal_int(a,b):    print "sigint!"    global flag_stop    flag_stop = Truesignal.signal(signal.SIGINT, onsignal_int)
signal.signal(signal.SIGTERM, onsignal_int)ser = serial.Serial('/dev/ttyUSB0', 9600, timeout = 0.001)print "serial.isOpen() =",ser.isOpen()cmd_send = "7b02000129cc00c80378290400640000cc7d0d0a"cmd_send = cmd_send.decode("hex")stop = "7b04047d0d0a"stop = stop.decode("hex")cmd_back = ""cmd_length = 0x00cmd_count = 0x00s = ser.write(cmd_send)while True:    sleep(0.1)        if flag_stop:                # read data until Ctrl+c        ser.write(stop)            # send cmd stop before exit        print "reset cmd has been sent!"        sleep(0.05)        break        text = ser.read(1)          # read one, with timout    if text:                    # check if not timeout        n = ser.inWaiting()     # look if there is more to read        if n:            text = text + ser.read(n) #get it        cmd_back = cmd_back + text        text = ""    if len(cmd_back) < 2:        # go back if no enough data recvd        continue        if cmd_length == 0x00:                        # at the begin of new cmd        cmd_length = ord(cmd_back[1])            # Type(1 byte),Length of Value(1 byte),Value        print "new cmd length,",cmd_length                if (cmd_length + 0x02) > len(cmd_back):        # go back befor this cmd end        continue        # so far, we have got a full cmd    hex_list = [hex(ord(i)) for i in cmd_back]    # more readable than data.encode("hex")    print "In buffer:",hex_list    cmd_back = cmd_back[cmd_length+2:]            # remove this cmd(TLV) from buffer    cmd_length = 0    cmd_count += 1    print "==> %d cmds recvd."%(cmd_count)    print "-------------"        ser.close()