pySerial:一次打开多个端口 [英] pySerial: opening multiple ports at once

问题描述

编辑:发现问题:我尝试引用一个变量，但混淆了它的名称，所以我声明了一个新变量.事实证明 pySerial 不限于一次打开一个串行点.

EDIT: Found the problem: I tried referencing a variable, but mixed up its name, so instead I declared a new variable. Turns out pySerial is not limited to one open serial point at a time.

我正在尝试使用以下代码同时打开两个串行端口

I'm trying to open two serial ports at once using the following code

    ser0 = serial.Serial(
                         port = port_list[0],
                         baudrate = 115200,
                         timeout = 0.1
                         )

    ser1 = serial.Serial(
                         port = port_list[1],
                         baudrate = 115200,
                         timeout = 0.1
                         )

不过好像我开了第二个，第一个关了.使用 pySerial 一次打开一个串行端口是否存在固有限制?

But it seems that I open the second, the first one closes. Is there an inherent limit to one serial port open at a time using pySerial?

谢谢，T.G.

我应该先发布这个

while not (comm_port0_open and comm_port1_open):
    print 'COM ports available:'
    port_list = []
    i = 0
    for port in __EnumSerialPortsWin32():
        port_list.append(port[0])
        print '%i:' % i, port[0]
        i+=1
    print 'Connect to which port? (0, 1, 2, ...)'
    comm_port_str = sys.stdin.readline()
    try:
        if len(comm_port_str)>0:
            if comm_port0_open:
                ser1 = serial.Serial(
                                    port = port_list[int(comm_port_str)],
                                    baudrate = 115200,
                                    timeout = 0.1
                                    )
                comm1_port_open = True
                print '%s opened' % port_list[int(comm_port_str)]
            else:
                ser0 = serial.Serial(
                                    port = port_list[int(comm_port_str)],
                                    baudrate = 115200,
                                    timeout = 0.1
                                    )
                comm0_port_open = True
                print '%s opened' % port_list[int(comm_port_str)]                   
        else:
            print 'Empty input'
    except:
        print 'Failed to open comm port, try again'

推荐答案

在您的代码中测试 comm_port0_open 和 comm_port1_open，但将它们设置为 comm0_port_open = True 和 comm1_port_open.不同的名字！

In your code you test comm_port0_open and comm_port1_open, but set them with comm0_port_open = True and comm1_port_open. Different names!

另外一点:不要使用裸的'except'，它可以隐藏各种错误.

Another point: don't use bare 'except', it can hide all kinds of errors.

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