I am trying to get data from the usb interface of an UT61B DMM.
That's my test program:
import usb.util
import usb.backend.libusb1
def Gosub():
failures = 0
failuresmaximum = 48
dev = usb.core.find (idVendor = 0x1a86, idProduct = 0xe008) #
Multimeter UT61B
if dev == None:
print ('Multimeter UT61B not found')
else:
print ('Multimeter UT61B was found')
print ('dev:\n' + str (dev) + '\n')
dev.set_configuration ()
ep = dev [0] [0,0] [0]
if ep == None:
print ('ep is None')
else:
data = None
while failures < failuresmaximum:
try:
data = dev.read (ep.bEndpointAddress, ep.wMaxPackeSize)
print ('Success. len (date): ' + len (date))
except:
failures += 1
print ('Failures: ' + str (failures))
if data == None:
print ('No data read')
else:
for ss in data:
print (str (ss))
print ('Starting')
Gosub ()
print ('Ready.-')
I get this output:
Starting
Multimeter UT61B was found
dev:
DEVICE ID 1a86:e008 on Bus 004 Address 002 =================
bLength : 0x12 (18 bytes)
bDescriptorType : 0x1 Device
bcdUSB : 0x100 USB 1.0
bDeviceClass : 0x0 Specified at interface
bDeviceSubClass : 0x0
bDeviceProtocol : 0x0
bMaxPacketSize0 : 0x8 (8 bytes)
idVendor : 0x1a86
idProduct : 0xe008
bcdDevice : 0x1200 Device 18.0
iManufacturer : 0x1 WCH.CN
iProduct : 0x2 USB to Serial
iSerialNumber : 0x0
bNumConfigurations : 0x1
CONFIGURATION 1: 100 mA ==================================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x2 Configuration
wTotalLength : 0x29 (41 bytes)
bNumInterfaces : 0x1
bConfigurationValue : 0x1
iConfiguration : 0x4 Error Accessing String
bmAttributes : 0x80 Bus Powered
bMaxPower : 0x32 (100 mA)
INTERFACE 0: Human Interface Device ====================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x4 Interface
bInterfaceNumber : 0x0
bAlternateSetting : 0x0
bNumEndpoints : 0x2
bInterfaceClass : 0x3 Human Interface Device
bInterfaceSubClass : 0x0
bInterfaceProtocol : 0x0
iInterface : 0x0
ENDPOINT 0x82: Interrupt IN ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x82 IN
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x8 (8 bytes)
bInterval : 0x5
ENDPOINT 0x2: Interrupt OUT ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x2 OUT
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x8 (8 bytes)
bInterval : 0x5
Failures: 48
No data read
Ready.-
Here is the USB trace of this failing code:
0 InfoStart 23:07:22.463 00:00:00.000 00:00:00.000
PNP 1 IRP_MN_QUERY_CAPABILITIES Down 23:07:32.703 00:00:10.239 00:00:10.239
PNP 2 IRP_MN_QUERY_CAPABILITIES Up 23:07:32.703 00:00:10.239
00:00:00.000 00:00:00.000 SUCCESS
URB 3 URB_FUNCTION_CLASS_INTERFACE Down 23:07:32.795 00:00:10.332
00:00:00.092 0 bytes OUT PENDING
URB 4 URB_FUNCTION_CONTROL_TRANSFER Up 23:07:32.795 00:00:10.332
00:00:00.000 00:00:00.000 0 bytes OUT SUCCESS
URB 5 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:07:32.795
00:00:10.332 00:00:00.000 8 bytes IN PENDING
URB 6 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:07:32.795
00:00:10.332 00:00:00.000 8 bytes IN PENDING
URB 7 URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE Down 23:07:32.795
00:00:10.332 00:00:00.000 258 bytes IN PENDING
URB 8 URB_FUNCTION_CONTROL_TRANSFER Up 23:07:32.795 00:00:10.332
00:00:00.000 00:00:00.000 18 bytes IN SUCCESS
URB 9 URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE Down 23:07:32.795
00:00:10.332 00:00:00.000 258 bytes IN PENDING
URB 10 URB_FUNCTION_CONTROL_TRANSFER Up 23:07:32.795 00:00:10.332
00:00:00.000 00:00:00.000 28 bytes IN SUCCESS
IOCTL 11 IOCTL_INTERNAL_USB_SUBMIT_IDLE_NOTIFICATION Down 23:07:33.806
00:00:11.343 00:00:01.010 PENDING
USBINTERFACE 12 IdleNotification Down 23:07:33.806 00:00:11.343
00:00:00.000 PENDING
URB 13 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Up 23:07:33.806
00:00:11.343 00:00:00.000 00:00:01.010 0 bytes IN CANCELLED
URB 14 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Up 23:07:33.806
00:00:11.343 00:00:00.000 00:00:01.010 0 bytes IN CANCELLED
USBINTERFACE 15 IdleNotification Down 23:07:33.806 00:00:11.343
00:00:00.000 PENDING
16 InfoStop 23:07:38.742 00:00:16.278 00:00:04.935 00:00:16.278
And here is the USB trace of a c++ program, which succeeds in reading
this DMM:
0 InfoStart 23:18:54.186 00:00:00.000 00:00:00.000
PNP 1 IRP_MN_QUERY_ID Down 23:19:03.550 00:00:09.364 00:00:09.364
PNP 2 IRP_MN_QUERY_ID Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 SUCCESS
PNP 3 IRP_MN_QUERY_CAPABILITIES Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 4 IRP_MN_QUERY_CAPABILITIES Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 SUCCESS
PNP 5 IRP_MN_QUERY_DEVICE_TEXT Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 6 IRP_MN_QUERY_DEVICE_TEXT Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 SUCCESS
PNP 7 IRP_MN_QUERY_DEVICE_TEXT Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 8 IRP_MN_QUERY_DEVICE_TEXT Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 SUCCESS
PNP 9 IRP_MN_QUERY_ID Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 10 IRP_MN_QUERY_ID Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 SUCCESS
PNP 11 IRP_MN_QUERY_ID Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 12 IRP_MN_QUERY_ID Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 SUCCESS
PNP 13 IRP_MN_QUERY_ID Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 14 IRP_MN_QUERY_ID Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 SUCCESS
PNP 15 IRP_MN_QUERY_ID Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 16 IRP_MN_QUERY_ID Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 NOT_SUPPORTED
PNP 17 IRP_MN_QUERY_INTERFACE Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 18 IRP_MN_QUERY_INTERFACE Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 SUCCESS
PNP 19 IRP_MN_QUERY_BUS_INFORMATION Down 23:19:03.550 00:00:09.364
00:00:00.000
PNP 20 IRP_MN_QUERY_BUS_INFORMATION Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 SUCCESS
PNP 21 IRP_MN_QUERY_RESOURCE_REQUIREMENTS Down 23:19:03.550 00:00:09.364
00:00:00.000
PNP 22 IRP_MN_QUERY_RESOURCE_REQUIREMENTS Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 NOT_SUPPORTED
PNP 23 IRP_MN_QUERY_RESOURCES Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 24 IRP_MN_QUERY_RESOURCES Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 NOT_SUPPORTED
PNP 25 IRP_MN_DEVICE_ENUMERATED Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 26 IRP_MN_QUERY_INTERFACE Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 27 IRP_MN_QUERY_INTERFACE Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 NOT_SUPPORTED
PNP 28 IRP_MN_DEVICE_ENUMERATED Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 SUCCESS
PNP 29 IRP_MN_QUERY_LEGACY_BUS_INFORMATION Down 23:19:03.550
00:00:09.364 00:00:00.000
PNP 30 IRP_MN_QUERY_LEGACY_BUS_INFORMATION Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 NOT_SUPPORTED
PNP 31 IRP_MN_QUERY_RESOURCE_REQUIREMENTS Down 23:19:03.550 00:00:09.364
00:00:00.000
PNP 32 IRP_MN_QUERY_RESOURCE_REQUIREMENTS Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 NOT_SUPPORTED
PNP 33 IRP_MN_FILTER_RESOURCE_REQUIREMENTS Down 23:19:03.550
00:00:09.364 00:00:00.000
PNP 34 IRP_MN_FILTER_RESOURCE_REQUIREMENTS Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 NOT_SUPPORTED
PNP 35 IRP_MN_QUERY_CAPABILITIES Down 23:19:03.550 00:00:09.364
00:00:00.000
PNP 36 IRP_MN_QUERY_CAPABILITIES Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 SUCCESS
PNP 37 IRP_MN_START_DEVICE Down 23:19:03.550 00:00:09.364 00:00:00.000
PNP 38 IRP_MN_START_DEVICE Up 23:19:03.550 00:00:09.364 00:00:00.000
00:00:00.000 SUCCESS
URB 39 URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE Down 23:19:03.550
00:00:09.364 00:00:00.000 18 bytes IN PENDING
URB 40 URB_FUNCTION_CONTROL_TRANSFER Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 18 bytes IN SUCCESS
URB 41 URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE Down 23:19:03.550
00:00:09.364 00:00:00.000 9 bytes IN PENDING
URB 42 URB_FUNCTION_CONTROL_TRANSFER Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 9 bytes IN SUCCESS
URB 43 URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE Down 23:19:03.550
00:00:09.364 00:00:00.000 41 bytes IN PENDING
URB 44 URB_FUNCTION_CONTROL_TRANSFER Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 41 bytes IN SUCCESS
URB 45 URB_FUNCTION_SELECT_CONFIGURATION Down 23:19:03.550 00:00:09.364
00:00:00.000 41 bytes OUT
URB 46 URB_FUNCTION_SELECT_CONFIGURATION Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 41 bytes IN SUCCESS
URB 47 URB_FUNCTION_CLASS_INTERFACE Down 23:19:03.550 00:00:09.364
00:00:00.000 0 bytes OUT PENDING
URB 48 URB_FUNCTION_CONTROL_TRANSFER Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 0 bytes OUT SUCCESS
URB 49 URB_FUNCTION_GET_DESCRIPTOR_FROM_INTERFACE Down 23:19:03.550
00:00:09.364 00:00:00.000 101 bytes IN PENDING
URB 50 URB_FUNCTION_CONTROL_TRANSFER Up 23:19:03.550 00:00:09.364
00:00:00.000 00:00:00.000 37 bytes IN SUCCESS
URB 51 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:19:03.566
00:00:09.380 00:00:00.015 8 bytes IN PENDING
URB 52 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:19:03.566
00:00:09.380 00:00:00.000 8 bytes IN PENDING
PNP 53 IRP_MN_QUERY_CAPABILITIES Down 23:19:03.566 00:00:09.380
00:00:00.000
PNP 54 IRP_MN_QUERY_CAPABILITIES Up 23:19:03.566 00:00:09.380
00:00:00.000 00:00:00.000 SUCCESS
PNP 55 IRP_MN_QUERY_PNP_DEVICE_STATE Down 23:19:03.566 00:00:09.380
00:00:00.000
PNP 56 IRP_MN_QUERY_PNP_DEVICE_STATE Up 23:19:03.566 00:00:09.380
00:00:00.000 00:00:00.000 NOT_SUPPORTED
PNP 57 IRP_MN_QUERY_DEVICE_RELATIONS Down 23:19:03.566 00:00:09.380
00:00:00.000
PNP 58 IRP_MN_QUERY_DEVICE_RELATIONS Up 23:19:03.566 00:00:09.380
00:00:00.000 00:00:00.000 SUCCESS
PNP 59 IRP_MN_QUERY_ID Down 23:19:03.566 00:00:09.380 00:00:00.000
PNP 60 IRP_MN_QUERY_ID Up 23:19:03.566 00:00:09.380 00:00:00.000
00:00:00.000 SUCCESS
PNP 61 IRP_MN_QUERY_ID Down 23:19:03.566 00:00:09.380 00:00:00.000
PNP 62 IRP_MN_QUERY_ID Up 23:19:03.566 00:00:09.380 00:00:00.000
00:00:00.000 SUCCESS
PNP 63 IRP_MN_QUERY_DEVICE_RELATIONS Down 23:19:03.566 00:00:09.380
00:00:00.000
PNP 64 IRP_MN_QUERY_DEVICE_RELATIONS Up 23:19:03.566 00:00:09.380
00:00:00.000 00:00:00.000 SUCCESS
URB 65 URB_FUNCTION_CLASS_INTERFACE Down 23:19:07.756 00:00:13.570
00:00:04.190 5 bytes OUT PENDING
URB 66 URB_FUNCTION_CONTROL_TRANSFER Up 23:19:07.756 00:00:13.570
00:00:00.000 00:00:00.000 5 bytes OUT SUCCESS
URB 67 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Up 23:19:07.756
00:00:13.570 00:00:00.000 00:00:04.190 8 bytes IN SUCCESS
URB 68 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:19:07.756
00:00:13.570 00:00:00.000 8 bytes IN PENDING
URB 69 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Up 23:19:07.772
00:00:13.586 00:00:00.015 00:00:04.205 8 bytes IN SUCCESS
URB 70 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:19:07.772
00:00:13.586 00:00:00.000 8 bytes IN PENDING
URB 71 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Up 23:19:07.788
00:00:13.601 00:00:00.015 00:00:00.031 8 bytes IN SUCCESS
URB 72 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:19:07.788
00:00:13.601 00:00:00.000 8 bytes IN PENDING
URB 73 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Up 23:19:07.788
00:00:13.601 00:00:00.000 00:00:00.015 8 bytes IN SUCCESS
URB 74 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:19:07.788
00:00:13.601 00:00:00.000 8 bytes IN PENDING
URB 75 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Up 23:19:07.803
00:00:13.617 00:00:00.015 00:00:00.015 8 bytes IN SUCCESS
URB 76 URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER Down 23:19:07.803
00:00:13.617 00:00:00.000 8 bytes IN PENDING
...
How should I change the above pyusb test program to get the DMM results?
Regards - Joe
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