Python 串口通訊

摘要：

pyserial module: https://github.com/tbusf/pyserial

Python使用pyserial進行串口通信：http://blog.csdn.net/log1100/article/details/54380325

串口通訊的python模塊——pySerial :http://blog.csdn.net/dainiao01/article/details/5885122

 

 

Parameters for the Serial class

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 created baudrate=9600, # baud rate bytesize=EIGHTBITS, # number of databits parity=PARITY_NONE, # enable parity checking stopbits=STOPBITS_ONE, # number of stopbits timeout=None, # set a timeout value, None for waiting forever xonxoff=0, # enable software flow control rtscts=0, # enable RTS/CTS flow control interCharTimeout=None # Inter-character timeout, None to disable )

Methods of Serial instances

open() # open port close() # close port immediately setBaudrate(baudrate) # change baud rate on an open port inWaiting() # return the number of chars in the receive buffer read(size=1) # read "size" characters write(s) # write the string s to the port flushInput() # flush input buffer, discarding all it's contents flushOutput() # flush output buffer, abort output sendBreak() # send break condition setRTS(level=1) # set RTS line to specified logic level setDTR(level=1) # set DTR line to specified logic level getCTS() # return the state of the CTS line getDSR() # return the state of the DSR line getRI() # return the state of the RI line getCD() # return the state of the CD line

Attributes of Serial instances
readonly

portstr # device name BAUDRATES # list of valid baudrates BYTESIZES # list of valid byte sizes PARITIES # list of valid parities STOPBITS # list of valid stop bit widths

New values can be assigned to the following attributes, the port will be reconfigured, even if it’s opened at that time:(即使是打開的情況下也會重新配置???liub)

port # port name/number as set by the user baudrate # current baud rate setting bytesize # byte size in bits parity # parity setting stopbits # stop bit with (1,2) timeout # timeout setting xonxoff # if Xon/Xoff flow control is enabled rtscts # if hardware flow control is enabled

居然還有這么多好東西,看看下面:

TCP/IP – serial bridge

This program opens a TCP/IP port. When a connection is made to that port (e.g. with telnet) it forwards all data to the serial port and vice versa.

This example only exports a raw socket connection. The next example below gives the client much more control over the remote serial port.

• The serial port settings are set on the command line when starting the program.
• There is no possibility to change settings from remote.
• All data is passed through as-is.

 

 

打開一個python shell

import serial導入模塊

然后就可以用了

ser = serial.Serial(0) 是打開第一個串口

print ser.portstr 能看到第一個串口的標識，windows下是COM1

ser.write(“hello") 就是往串口里面寫數據

ser.close() 就是關閉ser表示的串口

ser.open() 會打開這個串口

ser = serial.Serial('COM1', 115200) 來設置波特率，當然還有專門的函數

data = ser.read()可以讀一個字符

data = ser.read(20) 是讀20個字符

data = ser.readline() 是讀一行，以/n結束，要是沒有/n就一直讀，阻塞。

data = ser.readlines()和ser.xreadlines()都需要設置超時時間

ser.baudrate = 9600 設置波特率

ser 來查看當前串口的狀態

ser.isOpen() 看看這個串口是否已經被打開

 

import pyserial
t=serial.Serial()
    t.port = 3
    t.baudrate = 115200
    t.open()
t.write(chr(0x03))    #向串口輸入ctrl+c