我正在尝试与树莓派（32位raspbian 10内核：5.4.51-v7 +）上的设备进行一些基本的USB通信。
我正在逐字运行PyUSB代码：
# find our device
dev = usb.core.find(idVendor=0xfffe, idProduct=0x0001)
# was it found?
if dev is None:
raise ValueError('Device not found')
# set the active configuration. With no arguments, the first
# configuration will be the active one
dev.set_configuration()
# get an endpoint instance
cfg = dev.get_active_configuration()
intf = cfg[(0,0)]
ep = usb.util.find_descriptor(
intf,
# match the first OUT endpoint
custom_match = \
lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_OUT)
assert ep is not None
# write the data
ep.write('test')
我收到以下错误：
Traceback (most recent call last):
File "USB Testing.py", line 36, in <module>
ep.write('test')
File "/usr/lib/python3/dist-packages/usb/core.py", line 387, in write
return self.device.write(self, data, timeout)
File "/usr/lib/python3/dist-packages/usb/core.py", line 948, in write
self.__get_timeout(timeout)
File "/usr/lib/python3/dist-packages/usb/backend/libusb1.py", line 824, in bulk_write
timeout)
File "/usr/lib/python3/dist-packages/usb/backend/libusb1.py", line 920, in __write
_check(retval)
File "/usr/lib/python3/dist-packages/usb/backend/libusb1.py", line 595, in _check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 32] Pipe error
我可以看到设备/接口/端点：
DEVICE ID 1ab1:0641 on Bus 001 Address 006 =================
bLength : 0x12 (18 bytes)
bDescriptorType : 0x1 Device
bcdUSB : 0x200 USB 2.0
bDeviceClass : 0x0 Specified at interface
bDeviceSubClass : 0x0
bDeviceProtocol : 0x0
bMaxPacketSize0 : 0x40 (64 bytes)
idVendor : 0x1ab1
idProduct : 0x0641
bcdDevice : 0x101 Device 1.01
iManufacturer : 0x1 Rigol Technologies
iProduct : 0x2 DG4102
iSerialNumber : 0x3 DG4E191300534
bNumConfigurations : 0x1
CONFIGURATION 1: 2 mA ====================================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x2 Configuration
wTotalLength : 0x27 (39 bytes)
bNumInterfaces : 0x1
bConfigurationValue : 0x1
iConfiguration : 0x0
bmAttributes : 0xc0 Self Powered
bMaxPower : 0x1 (2 mA)
INTERFACE 0: Application Specific ======================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x4 Interface
bInterfaceNumber : 0x0
bAlternateSetting : 0x0
bNumEndpoints : 0x3
bInterfaceClass : 0xfe Application Specific
bInterfaceSubClass : 0x3
bInterfaceProtocol : 0x1
iInterface : 0x0
ENDPOINT 0x88: Interrupt IN ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x88 IN
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x40 (64 bytes)
bInterval : 0xb
ENDPOINT 0x2: Bulk OUT ===============================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x2 OUT
bmAttributes : 0x2 Bulk
wMaxPacketSize : 0x200 (512 bytes)
bInterval : 0x0
ENDPOINT 0x86: Bulk IN ===============================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x86 IN
bmAttributes : 0x2 Bulk
wMaxPacketSize : 0x200 (512 bytes)
bInterval : 0x0
我尝试了一些额外的操作，包括分离内核驱动程序和显式声明接口，以及显式使用libusb1后端。所有人都给管道带来了问题，所以我假设我缺少一些简单的东西或与硬件有关的东西。
我可以在Windows VISA上看到它并打开/对话，但是pi的PyVISA抛出：
Found a device whose serial number cannot be read. The partial VISA resource name is: USB0::6833::1601::???::0::INSTR
我收到ValueError：尝试通过PyVISA打开设备时，设备没有出现兰蒂德错误。
看一下pi的Wireshk捕获，GET DESCRIPTOR Request DEVICE的URB状态为-EINPROGRESS -115，这似乎是错误的。如果有帮助，我可以提供完整的Wireshk捕获。
小修改： 这不是特定于测试设备的