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I'm trying to read data from the camera, the camera works on the plug and play principle, that is, it does not require any additional settings. [Errno 5] Input/Output Error
Traceback (most recent call last):
File "/home/defaultuser/Downloads/usb_driver/usb_dbus.py", line 45, in GetData
ret = list(usb_driver.ep_read.read(cons.PACKAGE_SIZE))
File "/usr/lib/python3.8/site-packages/usb/core.py", line 423, in read
return self.device.read(self, size_or_buffer, timeout)
File "/usr/lib/python3.8/site-packages/usb/core.py", line 1029, in read
ret = fn(
File "/usr/lib/python3.8/site-packages/usb/backend/libusb1.py", line 879, in iso_read
return handler.submit(self.ctx)
File "/usr/lib/python3.8/site-packages/usb/backend/libusb1.py", line 680, in submit
_check(_lib.libusb_submit_transfer(self.transfer))
File "/usr/lib/python3.8/site-packages/usb/backend/libusb1.py", line 604, in _check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])Camera metadata: My code: def init(dev):
global ret, ep_read, ep_write
print("init")
# try:
# if dev.is_kernel_driver_active(0):
# dev.detach_kernel_driver(0)
# except Exception as e:
# print(e)
# print("Error detaching kernel driver")
# return e
# try:
# dev.reset()
# except Exception as e:
# print(e)
# print("Error resetting device")
# return e
try:
dev.set_configuration()
except Exception as e:
print(e)
print("Error setting configuration")
return e
try:
cfg = dev.get_active_configuration()
print(cfg)
intf = cfg[(0, 0)]
for cf in cfg:
print(cf.bInterfaceNumber)
if cf.bInterfaceNumber != 0 and cf.bAlternateSetting == 0x5:
print("\n\nintf")
print(cf)
intf = cf
break
except Exception as e:
print(e)
print("Error getting configuration")
return e
try:
ep_read = usb.util.find_descriptor(
intf,
custom_match= \
lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_IN)
except Exception as e:
print(e)
print("Error finding IN endpoint")
return e
try:
ep_write = usb.util.find_descriptor(
intf,
custom_match= \
lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_OUT)
except Exception as e:
print(e)
print("Error finding OUT endpoint")
return ePACKAGE_SIZE = 65536 def GetData(self) -> List[int]:
try:
# print(usb_driver.ep_read)
while True:
ret = list(usb_driver.ep_read.read(cons.PACKAGE_SIZE))
print(ret)
if ret[0] != 253 and self.remain_data == []:
continue
self.data += ret
if self.remain_data != []:
self.data = self.remain_data + self.data
self.remain_data = []
print("No valid packet: ", self.data)
self.result_data = []
while True:
if len(self.data) >= 2:
payload_length = self.data[1]
if len(self.data) == payload_length + 12:
self.result_data += self.data
self.data = []
print("Result data: ", self.result_data)
return self.result_data
elif len(self.data) > payload_length + 12:
self.result_data += self.data[:payload_length + 12]
print("Data: ", self.data)
self.data = self.data[payload_length + 12:]
else:
self.remain_data += self.data
self.data = []
print("Remain data: ", self.remain_data)
print("Result data: ", self.result_data)
return self.result_data
else:
self.remain_data += self.data
self.data = []
print("Remain data: ", self.remain_data)
print("Result data: ", self.result_data)
return self.result_data
except Exception as e:
print(e)
traceback.print_exc()
return []And i can get data from some STM or ESP boards. |
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Answered by
mcuee
May 26, 2024
Replies: 1 comment
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You have to know the communcation protocol in order to use pyusb/libusb. |
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0 replies
Answer selected by
mcuee
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You have to know the communcation protocol in order to use pyusb/libusb.