Updating to use libusb0 instead of libusb1

di2008/__init__.py

@@ -3,6 +3,9 @@
     DigitalDirection
 from di2008.version import __version__
 
+import os
+os.environ['PYUSB_DEBUG'] = 'debug'
+
 __all__ = ['AnalogPort', 'RatePort', 'CountPort', 'DigitalPort', 'Di2008',
            'AnalogPortError', 'DigitalPortError', 'PortNotValidError',
            'DigitalDirection',

di2008/instrument.py

@@ -9,6 +9,7 @@
 from time import sleep
 from typing import List
 
+import usb.backend.libusb0 as libusb0
 import usb.core
 import usb.util
 
@@ -20,7 +21,10 @@
 
 
 def _discover_auto() -> 'usb.core.Device':
-    available_devices = [d for d in usb.core.find(find_all=True, idVendor=0x0683, idProduct=0x2008)]
+    available_devices = [d for d in usb.core.find(find_all=True,
+                                                  idVendor=0x0683,
+                                                  idProduct=0x2008,
+                                                  backend=libusb0.get_backend())]
     if len(available_devices) == 0:
         raise AttributeError('there are no DI-2008 devices attached to the PC that are in USB mode')
 
@@ -40,13 +44,15 @@ def _discover_auto() -> 'usb.core.Device':
 
     return device
 
+
 def _discover_by_esn(serial_number: str) -> 'usb.core.Device':
     buffering_time = 0.05
     correct_device = None
 
     available_devices = [d for d in usb.core.find(find_all=True,
                                                   idVendor=0x0683,
-                                                  idProduct=0x2008)]
+                                                  idProduct=0x2008,
+                                                  backend=libusb1.get_backend())]
     dev_strings = [str(d) for d in available_devices]
     _logger.debug(f'DI-2008 instruments detected on: {", ".join(dev_strings)}')
 
@@ -833,10 +839,10 @@ def _run(self):
                 try:
                     response = self._device.read(ENDPOINT_BULK_IN, 64, timeout=timeout_ms)
                     self._parse_received(response)
-                except usb.core.USBTimeoutError:
+                except (usb.core.USBTimeoutError, usb.core.USBError):
                     break
                 except Exception as e:
-                    print(f'unknown error: {e}')
+                    self._logger.warning(f'unknown error: {e}')
                     break
 
             self._maintain_send_queue()

di2008/version.py

@@ -1 +1 @@
-__version__ = '0.4.5'
+__version__ = '0.4.7'

examples/analog_reads.py

@@ -10,11 +10,11 @@
 daq = Di2008(loglevel=loglevel)
 
 channels = [
-    RatePort(5000),
     AnalogPort(1, analog_range=10.0, filter='average', loglevel=loglevel),
     AnalogPort(2, analog_range=10.0, loglevel=loglevel),
     AnalogPort(3, analog_range=10.0, loglevel=loglevel),
     AnalogPort(8, analog_range=10.0, loglevel=loglevel),
+    RatePort(5000),
 ]
 
 daq.create_scan_list(channels)

examples/backend_test.py

@@ -0,0 +1,24 @@
+import coloredlogs
+import logging
+import ctypes
+
+print('ctypes.WinDLL', ctypes.WinDLL('libusb-1.0.dll'))
+
+import os
+os.environ['PYUSB_DEBUG'] = 'debug'
+# os.environ['PYUSB_LOG_FILENAME'] = 'C:\\_code\\di2008\\examples\\usblog.txt'
+
+coloredlogs.install(level=logging.DEBUG)
+
+import usb.core
+import usb.util
+import usb.backend.libusb1 as libusb1
+
+devices = [d for d in usb.core.find(find_all=True,
+                                    idVendor=0x0683,
+                                    idProduct=0x2008)]
+
+[print(d) for d in devices]
+
+device = devices[0]
+device.set_configuration()

examples/lib_usb_testing.py

@@ -1,15 +1,36 @@
+import logging
+import os
 from time import sleep
+
 import usb.core
 import usb.util
+import usb.backend.libusb0 as libusb
+
+logging.basicConfig(level=logging.DEBUG)
+usb_logger = logging.getLogger('usb.core')
+usb_logger.setLevel(logging.DEBUG)
 
-devices = [d for d in usb.core.find(find_all=True, idVendor=0x0683, idProduct=0x2008)]
+# for p in os.environ.get('PATH').split(';'):
+#     print(f'path: "{p}"')
+
+backend = libusb.get_backend()
+print('backend:', backend)
+devices = [d for d in usb.core.find(find_all=True,
+                                    idVendor=0x0683,
+                                    idProduct=0x2008,
+                                    backend=backend,
+                                    )]
 
 print(devices)
 device = devices[0]
 print(device)
 print(type(device))
 device.set_configuration(1)
 
+# send "stop" command just in case the device happens to be scanning
+device.write(0x1, 'stop')
+sleep(0.2)
+
 response = device.read(0x81, 64)
 response = ''.join([chr(b) for b in response if b != 0])
 print(f'response when nothing was sent: "{response}"')