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Visitor II
December 22, 2005
Question

How to send USB Bulk zero length packet?

  • December 22, 2005
  • 1 reply
  • 594 views
Posted on December 22, 2005 at 06:08

How to send USB Bulk zero length packet?

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    1 reply

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    faAuthor
    Visitor II
    December 22, 2005
    Posted on December 22, 2005 at 06:08

    To end a bulk in transfer, either the data packet is less than maximum or a zero length packet has to be transfered.

    How do I transfer a zero length packet?

    If I set the buffer count to zero, no transmission ocurs.

    The problem is only present when I transfers an amount of data, which is a multiply of 64 eg. 512 bytes. Then if I do that twice, then it appears as one bulk transfer of 1024 bytes, on my USB analyzer.

    Best regards,

    Frank Andersen

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