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    Navigation: All forums > Usb > Message List > Message Post

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    From: P.Ravi<pravi@a...>
    Date: Wed Feb 25 08:36:40 CET 2004
    Subject: [usb] Enumeration
    Top
    Hi

    Is there any difference if we send 18 bytes of data instead of 8 bytes
    when host requests for device
    descriptors after reset.

    Can anybody explain what exactly is happening here

    host - > reset
    host -> request for device descriptors
    device -> responding with 18 bytes of device descriptor
    host -> reset
    device -> set address to 4
    host -> reset

    Please note that acks are present but not mentioned. There is no nack
    either from device or host.

    Instead of another request form host for device descriptors its issuing
    reset.

    After set_address there is 549.673 ms silence and then host is sending
    reset.

    Please help

    Thanks in advance.

    regards




    Follow upAuthor
    [usb] EnumerationSteve

     
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