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。