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