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USB IN Endpoint freeze after some time

Gaurav Jain

Hello Guys,

I am working on USB CDC application. I am using Windows XP and usbser.sys driver at host side.
I am trying to run a loopback in which host initiated a write of 64K to USB device over BULK OUT Endpoint and then read it back over BULK IN Endpoint. This loop should be able to run indefinitely.

Now the problem is after some time, HOST stops sending IN token to device. hence device stop sending data over IN Endpoint.
There is no ERR or STALL messages are being sent by either device. HOST just stops sending IN token to device.

I am not seeing this problem for small packet size like 512 bytes, 1K bytes. For these packet size loopback runs for a long time.

Kindly help me if anyone has any clue. I have read so many forum but didn't get the clue for this issue.
Any help is highly appreciated.

Regards,
Gaurav

Parents
  • 0 in reply to Gaurav Jain

    Hmmm..
    Sound like bulk IN error case.

    Windows CDC driver, usbser.sys, silently stops bulk IN transactions on error.
    It doesn't do any error recovery, like reset_pipe.
    For the details, visit to this post

    CDC - stalled bulk IN
    www.microchip.com/.../m538194.aspx

    Noise on USB line is often the cause of this error.
    But this error is also caused when device drops bulk IN endpoint into disabled.

    If you see this trouble randomly, noise may be the culprit.
    But if it occurs regularly, disabled bulk IN EP may be the cause.

    Tsuneo

Reply
  • 0 in reply to Gaurav Jain

    Hmmm..
    Sound like bulk IN error case.

    Windows CDC driver, usbser.sys, silently stops bulk IN transactions on error.
    It doesn't do any error recovery, like reset_pipe.
    For the details, visit to this post

    CDC - stalled bulk IN
    www.microchip.com/.../m538194.aspx

    Noise on USB line is often the cause of this error.
    But this error is also caused when device drops bulk IN endpoint into disabled.

    If you see this trouble randomly, noise may be the culprit.
    But if it occurs regularly, disabled bulk IN EP may be the cause.

    Tsuneo

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