visa driver wrong endpoint descriptors

[cschwarz]

Hello,

I am trying to communicate with a custom-made HID device with LabVIEW using the NI-VISA Driver Wizard. The device can be used with the standard windows driver with C#, but now I will use it with LabVIEW.

The device has the following endpoint descriptors:

Endpoint Descriptor 81 1 In, Interrupt, 1 ms

Offset	Field	Size	Value	Description
0	bLength	1	07h
1	bDescriptorType	1	05h	Endpoint
2	bEndpointAddress	1	81h	1 In
3	bmAttributes	1	03h	Interrupt
	1..0: Transfer Type		......11	Interrupt
	7..2: Reserved		000000..
4	wMaxPacketSize	2	0040h	64 bytes
6	bInterval	1	01h	1 ms

Endpoint Descriptor 01 1 Out, Interrupt, 1 ms

Offset	Field	Size	Value	Description
0	bLength	1	07h
1	bDescriptorType	1	05h	Endpoint
2	bEndpointAddress	1	01h	1 Out
3	bmAttributes	1	03h	Interrupt
	1..0: Transfer Type		......11	Interrupt
	7..2: Reserved		000000..
4	wMaxPacketSize	2	0040h	64 bytes
6	bInterval	1	01h	1 ms

There are two endpoint descriptors for communication in Interrupt mode. But after creating a driver with the Driver Wizard this driver doesn't have these two endpoints. Instead it recognizes the descriptor with 0x1 as Bulk In Pipe and the Descriptor 0x81 as Interrupt In Pipe (a screenshot is attached, because the values cannot be copied).

A communication with the LabVIEW examples which uses the Interrupt In Pipe does work, but everything else failed because of the wrong out endpoint.

Is there any way to correct the descriptors?

Thanks,

Chris

[nyc_(is_out_of_here)]

Wouldn't the easier approach be to make the same calls in LabVIEW as in C#?

In other words, understand how it is done in C# and try to replicate it in LabVIEW instead of going through this Driver wizard?

[Dennis_Knutson]

A HID device/driver is completely different than a VISA RAW driver. If you used HID before, why are you changing it?

[cschwarz]

Hello,

I thought it would be much easier to communicate with the device from LabVIEW with such a driver. Are there any good examples to communicate with HID devices with the standard Microsoft dll?

I was searching a lot but I didn't find any good material...

Regards,

Chris

[nyc_(is_out_of_here)]

---

@cschwarz wrote:

Hello,

I thought it would be much easier to communicate with the device from LabVIEW with such a driver. Are there any good examples to communicate with HID devices with the standard Microsoft dll?

I was searching a lot but I didn't find any good material...

Regards,

Chris

---

You mentioned C# in a previous post. Look at that example.