Raspberry Pyusb使资源繁忙



我正试图通过USB将我的Raspberry PI连接到Pic4550。(Pic功能在windows c#程序中可以使用!)。所以我安装了rpi2,pyusb,并尝试在[https://github.com/walac/pyusb/blob/master/docs/tutorial.rst][1]

我连接到USB设备,lsusb显示:

总线001设备006:ID 04d8:0080微芯片技术,股份有限公司

python程序找到了设备!获取正确的配置,但无法写入消息:

usb.core.usb错误:[Erno 16]资源繁忙

我试着以sudo的身份运行,我添加了规则:

SUBSYSTEM=="usb",ATTR{idVendor}=="04d8",ATTR{idProduct}="0080",MODE="666"

无论如何,我得到同样的资源繁忙

有胶水帮助链接吗?

对于像我这样的新手,我发布了我的解决方案。总之:仔细阅读文档。

Python:3.2

PyUSB 1.0

端点是HID设备。

这是我的代码工作正常。

import usb.core
import usb.util
import sys
from time import gmtime, strftime
import time
print ("Meteo kezdés",strftime("%Y-%m-%d %H:%M:%S", gmtime()))

# find our device
dev = usb.core.find(idVendor=0x04d8, idProduct=0x0080)
# was it found?
if dev is None:
    raise ValueError('Device not found')
else:
    print ("meteo megvan!")
reattach = False
if dev.is_kernel_driver_active(0):
    reattach = True
    dev.detach_kernel_driver(0)
endpoint_in = dev[0][(0,0)][0]
endpoint_out = dev[0][(0,0)][1]
#print ("endpoint_out",endpoint_out)
#print ("endpoint_in",endpoint_in)
# write the data
msg = b'x81'
while 1:
    try:
        endpoint_out.write(msg)
        # reading
        #print ("Waiting to read...")
        #print (endpoint.bEndpointAddress)
        data = dev.read(endpoint_in.bEndpointAddress, 64, 1000)
        DHT11_H = data[0]   # a tobbi helyiertek kimaradt!!
        DHT11_R = data[4]
        BMP180_H = data[8]
        BMP180_P = (data[12]+data[13]*256+data[14]*65536)/100
        print (strftime("%Y-%m-%d %H:%M:%S", gmtime()),
        "DHT t=" , str(DHT11_H) , "C| ",
        "DHT r=", DHT11_R, "%| " ,
        "BMP t=", BMP180_H, "C| " ,
        "BMP p=", BMP180_P, "HPa"
        )
        #print (data)
        time.sleep(10)
    except usb.core.USBError:
        print ("USB error")
    except:
        print ("write failed")
# end while
# This is needed to release interface, otherwise attach_kernel_driver fails
# due to "Resource busy"
usb.util.dispose_resources(dev)
# It may raise USBError if there's e.g. no kernel driver loaded at all
if reattach:
    dev.attach_kernel_driver(0)

我从这里找到了解决方案(不远…):

Python 中与USB设备的通信

驱动程序应该像这样分离:

if dev.is_kernel_driver_active(0):
    reattach = True
    dev.detach_kernel_driver(0)

我使用的是Raspberry 3B+,Python 2.7,并且有完全相同的错误消息:

usb.core.usb错误:[Erno 16]资源繁忙

对我来说,dev.reset()解决了我的问题。谢谢@rishta。

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