Python PySerial 读取行超时

发布于 2024-09-13 14:21:58 字数 418 浏览 1 评论 0原文

我正在使用 pyserial 与嵌入式设备进行通信。

ser = serial.Serial(PORT, BAUD, timeout = TOUT)
ser.write(CMD)
z = ser.readline(eol='\n')

因此，我们向设备发送 CMD，它会回复一个以 '\n' 结尾的长度可变的字符串，

如果设备无法重播，则 readline() 超时，并且z=''

如果设备中断或崩溃，它会发送数据，然后 readline() 超时 z 将是一个末尾没有 '\n' 的字符串。

除了检查 z 的状态之外，是否有一种好方法来检查 readline() 是否超时。

原文

I'm using pyserial to communicate with a embedded devise.

ser = serial.Serial(PORT, BAUD, timeout = TOUT)
ser.write(CMD)
z = ser.readline(eol='\n')

So we send CMD to the device and it replies with an string of varing length ending in a '\n'

if the devise cant replay then readline() times-out and z=''

if the devise is interrupted or crashes will it's sending the data then readline() times-out
and z will be a string without a '\n' at the end.

Is there a nice way to check if readline() has timed-out other than checking the state of z.

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守护在此方 2024-09-20 14:21:58

我想你可能想做的是..

import re
import time
import serial

def doRead(ser,term):
    matcher = re.compile(term)    #gives you the ability to search for anything
    tic     = time.time()
    buff    = ser.read(128)
    # you can use if not ('\n' in buff) too if you don't like re
    while ((time.time() - tic) < tout) and (not matcher.search(buff)):
       buff += ser.read(128)

    return buff

if __name__ == "__main__":
    ser = serial.Serial(PORT, BAUD, timeout = TOUT)
    ser.write(CMD)
    print doRead(ser,term='\n')

I think what you might like to do is..

import re
import time
import serial

def doRead(ser,term):
    matcher = re.compile(term)    #gives you the ability to search for anything
    tic     = time.time()
    buff    = ser.read(128)
    # you can use if not ('\n' in buff) too if you don't like re
    while ((time.time() - tic) < tout) and (not matcher.search(buff)):
       buff += ser.read(128)

    return buff

if __name__ == "__main__":
    ser = serial.Serial(PORT, BAUD, timeout = TOUT)
    ser.write(CMD)
    print doRead(ser,term='\n')

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