Python Pyserial同时从多个串行端口读取数据

Question

我正在尝试使用Python 2.7和PySerial同时读出多个串行端口 功能应该是：

1. 在主程序中我得到所有打开的串口，打开它们并将串行对象追加到serialobjects
2. 我想在一个子进程中读取每个串口数据以进行并行化

最大的问题是：如何将串口对象传递给子进程？
OR：
是否存在另一个（也许是更好的）解决方案？ （也许this：如何将扭曲的串口应用于我的问题？）

修改

我想我并不完全清楚自己想要达到的目标 我想同时读出2个或更多串口。由于超时和读出时间，无法在一个过程中同时读出它们 以下方法

ser1 = serial.Serial(port="COM1",baudrate=9600)
ser2 = serial.Serial(port="COM2",baudrate=9600)

ser1.write('command for reading out device 1')
output1 = ser1.readline()

ser2.write('command for reading out device 2')
# now you have to wait at least 100ms for device 2 to respond
output2 = ser2.readline()

无法满足我的需求。

另一个方法是并行化子进程中的序列读数。

main.py

import serial   # serial communication
from subprocess import Popen, PIPE

ports = ["COM1", "COM2"]
for port in ports:
    ser = serial.Serial()
    ser.port=port
    ser.baudrate=9600
    # set parity and ...

    serialobjects.append(ser)

# call subprocess
# pass the serial object to subprocess
# read out serial port


# HOW TO PASS SERIAL OBJECT HERE to stdin
p1 = Popen(['python', './ReadCOM.py'], stdin=PIPE, stdout=PIPE, stderr=PIPE) # read COM1 permanently
p2 = Popen(['python', './ReadCOM.py'], stdin=PIPE, stdout=PIPE, stderr=PIPE) # read COM2 permanently

for i in range(10):
    print "received from COM1: %s" % p1.stdout.readline() # print output from ReadCOM.py for COM1
    print "received from COM2: %s" % p2.stdout.readline() # print output from ReadCOM.py for COM2

ReadCOM.py（取自related post并已编辑）

import sys

while True:  # The program never ends... will be killed when master is over.
    # sys.stdin.readline()

    ser.write('serial command here\n') # send command to serial port
    output = ser.readline() # read output

    sys.stdout.write(output) # write output to stdout
    sys.stdout.flush()

提前致谢！

Answer 1

首先更改ReadCOM.py以接收参数

import sys
import serial

ser = serial.Serial(port=sys.argv[1],baudrate=int(sys.argv[2]))
while True:  # The program never ends... will be killed when master is over.
    # sys.stdin.readline()

    ser.write('serial command here\n') # send command to serial port
    output = ser.readline() # read output

    sys.stdout.write(output) # write output to stdout
    sys.stdout.flush()

并在main.py传递之后：

from subprocess import Popen, PIPE

# call subprocess
# pass the serial object to subprocess
# read out serial port


# HOW TO PASS SERIAL OBJECT HERE to stdin
p1 = Popen(['python', './ReadCOM.py', "COM1", "9600"], stdin=PIPE, stdout=PIPE, stderr=PIPE) # read COM1 permanently
p2 = Popen(['python', './ReadCOM.py', "COM2", "9600"], stdin=PIPE, stdout=PIPE, stderr=PIPE) # read COM2 permanently

for i in range(10):
    print "received from COM1: %s" % p1.stdout.readline() # print output from ReadCOM.py for COM1
    print "received from COM2: %s" % p2.stdout.readline() # print output from ReadCOM.py for COM2