Hi all, for a University project i am developing form scratch an USBTMC compliant device that is a simple DAC frontend for Labview.
I already developed ad USB Full Speed device using a simple PIC32MX250F128 processor.
It is recognised in MAX ad i can use it within VIs using Visa USB blocks.
I can open, close, write, read and other block primitives.
With my usb analyzer i found that the visa write block send data to Bulk-Out endpoint with a USBTMC compliant header that specify in the MsgID field the "DEV_DEP_MSG_OUT" command message. (byte 0x01)
The Visa Read Block send to the Bulk-Out endpoint an USBTMC compliant header that specify in the MsgID field the "REQUEST_DEV_DEP_MSG_IN" (byte 0x02)
Then a Bulk-In request is issued and data are read from device. So far so good.
However i would like to send to device a "VENDOR_SPECIFIC_OUT" messge in the BulkOut Pipe (byte 0x7E in MsgID field) and a "REQUEST_VENDOR_SPECIFIC_IN" for reading data from.
The Visa Write and Visa Read blocks have no option to specify what kind of usbtmc request i want.
So i wonder if there is a way to do it. I found visa block for forge arbitrary control in and control out request and for get interrupt data but they are not usefull for the bulk endpoint. I need a way to control the USBTMC bulkout and in header.
How to do it ?
Tnx for support.
