使用PyUSB通过USB发送数据

问题描述

我需要使用Python通过USB发送数据，我正在使用PyUSB(http://sourceforge.net/apps/trac/pyusb/)我寻找任何可用的USB端口，并尝试发送一条消息:

I need to send data via USB using Python, I'm using PyUSB (http://sourceforge.net/apps/trac/pyusb/)I look for any USB port available, and I tried to send a message:

devList = usb.core.find(find_all=True)
for dev in devList:
    for cfg in dev:
        for intf in cfg:
            sys.stdout.write('\t' + str(intf.bInterfaceNumber) + ',' + str(intf.bAlternateSetting) + '\n')
            for ep in intf:
                sys.stdout.write('\t\t' + str(ep.bEndpointAddress) + '\n')
                if ep.bEndpointAddress:
                    try:
                        dev.write(ep.bEndpointAddress, 'test', intf.bInterfaceNumber)
                    except Exception:
                        print "\t\terror : dev.write("+str(ep.bEndpointAddress)+", 'test', "+str(intf.bInterfaceNumber)+")"

结果是:

    0,0
            129
            error : dev.write(129, 'test', 0)
    0,1
            129
            error : dev.write(129, 'test', 0)
    0,0
            136
            error : dev.write(136, 'test', 0)
            10
            error : dev.write(10, 'test', 0)
    1,0
            139
            error : dev.write(139, 'test', 1)
            13
            error : dev.write(13, 'test', 1)

如果没有尝试，它会给出:

without try catch it gives:

usb.core.USBError: [Errno None] usb_claim_interface: could not claim interface 0, invalid configuration 0

怎么了?有没有通过python与USB通信的最佳方法?因为我刚刚找到了这个库

What is wrong? Is there a best way to communicate via usb with python? because I just have found this lib

推荐答案

如教程中所述:

显然，大多数情况下只有一种配置.假设所有这些配置都来自不同的设备，则可以执行以下操作:

Apparently most of the times there is only one configuration. Assuming all those configurations are from different devices, you can do something like:

for dev in devList:
    for cfg in dev:

        cfg.set()

        for intf in cfg:

如果由于资源繁忙"而无法设置配置，则需要卸载其接口内核驱动程序:

If you can't set a configuration due to "resource busy", you'll need to unload its interface kernel driver:

dev.detatch_kernel_driver(interface)

这篇关于使用PyUSB通过USB发送数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！