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MSP563x USB debugging

Felton Christopher
Prodigy 30 points

We recently moved from the 5528 to the 5636.  Bringing up the board I have run
into issues with the USB.  We are using the 3.20.2 version of the TI USB stack
(tested with the a previous version, as well).

The issue I am seeing is the device/stack continuously sends a NACK  after 
enumeration.  Below is a USB trace of the enumeration and NACKs.  I do not
know the details of the USB transactions we have been using the TI stack to
handle this complexity :)   Before I start digging into the details of the USB 
transactions what are some additional debugging I can try? 

We did not observe the same behavior on the 5528 device with the same stack
version.  Does anyone have some good suggestions on a debug path? 

Regards,
Chris

Including the last summary of the trace.  Appears to be a NAK every 10us'ish.

~~~~~~~~~~ USB Trace ~~~~~~~~~~~~~~~~

______________________________________________________________________________
ConsecutiveTransaction count<676,481> type<IN> device<1> endpoint<2>
status<NAK> speed<FS> time<14.011 191 017>

  • 0
    Prodigy 30 points

    An update on this issue.  The CDC data in and data out are actually working.
    I am able to move data with the latest TI USB stack.  But the NACK attack
    persists?  I tested this on both the 5528 and the 5636, it appears to be a
    firmware/configuration issue.  Any ideas how to debug the NACK attack
    would be appreciated. 

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