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how to improve the dm355 usb transmit speed?

laibaotang
Intellectual 400 points

hi

   how to modify usb driver in order to improve the usb transmit speed?which register do i modify ?

 

tanglaibao

  • TI__Expert 7435 points

    Hi,

    Is there any throughput number that your application needs which the DM355 USB driver is not able to achieve?

    Can you provide details as to your application and the throughput expectation.  USB driver in DM355 is well optimized for performance and typically the optimization have to be done in the upper level apps.

    regards

    swami

  • in reply to swami
    Prodigy 35 points

    I am trying to develop a customized USB gadget driver. I am emulating streaming using bulk endpoint. . I am using gadget/zero.c as a base. Source is pumping data in higher rate than the rate of consumption.

    How to increase the rate (frame rate) of consumption in usb gadget?

    Is it possible to modify some parameter in gadget side itself?

     

  • in reply to madhavanandhan
    Intellectual 870 points

    Gadget Zero isn't intended to be a speed demon even in hardware which cooperates better; it doesn't keep a buffer queued, so there's often going to be a delay between RX of the last packet of one buffer and the first one of the next.  And RX DMA with CPPI3 is unlikely to be fast ... there are some design issues, which is why CPPI4 exists.  Depending on details of your application-level fault recovery, maybe you can set the short_not_ok flag in the requests to make DMA RX use a multipacket mode.