Question

确切的错误是：usb.core.USBError：[Errno无] usb_claim_interface：无法声明接口

我正在使用pydev 1.0（使用libusb 1.0.9）与传感器连接。我试过摆弄各种各样的东西，但没有运气（以root身份运行我的代码不会改变任何东西）。我的代码检测到设备但在我尝试读取时死亡。我见过其他mac用户报告同样的问题，但我还没有找到答案:(

device = usb.core.find(idVendor = vendorId, idProduct = productId)
device.set_configuration()
cfg = device.get_active_configuration()
interface_number = cfg[(0,0)].bInterfaceNumber
alternate_setting = usb.control.get_interface(device, interface_number)

# Get Interface Descriptor
intf = usb.util.find_descriptor(
    cfg, 
    bInterfaceNumber = interface_number,
    bAlternateSetting = alternate_setting
)

# Get Endpoint Descriptor
ep = usb.util.find_descriptor(
    intf,
    custom_match = \
    lambda e: \
        usb.util.endpoint_direction(e.bEndpointAddress) == \
        usb.util.ENDPOINT_IN
)

assert ep is not None

# Tried this but didn't help :/
# usb.util.claim_interface(device, intf)

size = 2
print str(device.read(0x82, size))

PyUSB - OS X 10.7.4上的“usb_claim_interface：无法声明接口”错误

0 个答案: