USBTMC: host constantly sent in bulk OUT packages

Hello

We develop firmware for a new device TMC. Device is listed as a class IIA successfully [see: 1_WinDeviceMgr.png]

At this point, the firmware is at a very basic level with EP control manages all standard applications (get capabilities is not yet in place); loose on the endpoint is ready for data.

Currently I'm stuck with a question, host driver is indefintelty sending LOOSE on the packates of data [see: 2_BeagleTrace.png]-the same behavior is observed when using both Win and Linux hosts!

I'm not sure I understand this behavior. Class USBTMC [USBTMC_1_00.pdf and USBTMC_usb488_subclass_1_00.pdf] form seems simple.

Can you please specify:

1 - Windows is able to detect this device - but NEITHER MAX is not able to identify it (I ve follow-up OR forum link as well - http://digital.ni.com/public.nsf/allkb/BE81A3BE80E415D2862579DB006B131A)

2 - Why is there a continuous EP1 - BLOCK OF data from the host?

3. connected beagle lists this new device (7) on BusIdx:7; There is no data on EP1 bulkout!, but not sure about the place where the ' unknown device (8): EP1 (BusIdx:2) data comes from? probably for this reason, our library of device is confused and failed to understand the data!

4. I think I know, snoop beagle should list only one bus index 8, but not sure why it has 8 index of listed bus!

Please throw some light, if you have any clues on these - capture Beagle [3_beagle_trace.tdc] is also attached for your reference.

Thank you for your support.

Kind regards

Srinivas

Hello

An update on the below question:

-Yet, there is network traffic (with the data of the message as 72 00 00 00 0 x), but with an option to ignore this message, the end points of data (bulk OUT and in bulk IN) are ready to exploit for the TMC functionality!

-Driver Linux USBTMC message GET_CAPABILITIES requests, and so it must be supported at least on the device code, apart from the exchange of data between the end points in bulk

-MAX OR and OR labVIEW can recognize the device only of the > 0 number series field

In answering the above adjustments, our firmware of the device began to work well.

Thank you for your comments and support.

Kind regards

Sriniv

Tags: NI Hardware

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