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OMAPl138 USB config

Oplk.Ray
Prodigy 120 points
Other Parts Discussed in Thread: OMAPL138

we are developing USB2.0 application recently on OMAPL138 and I found the sample code that TI supplied in startware did not work well.

After connecting, the host(PC) could not recognize the device which was enumerated to serial controller(that is USB_dev_serial).

I wonder how I can solve it and wish your help,thanks.

  • 0
    Prodigy 120 points

     

    I used an implement named usbmon in Linux to capture the USB packet between the host and OMAPL138 which was configed as a device.The information reported is shown below:

    eb424d80 640575470 S Ci:5:001:0 s a3 00 0000 0001 0004 4 <
    eb424d80 640575478 C Ci:5:001:0 0 4 = 00010000
    eb424d80 640575482 S Ci:5:001:0 s a3 00 0000 0002 0004 4 <
    eb424d80 640575485 C Ci:5:001:0 0 4 = 00010000
    ef830180 640575488 S Ii:5:001:1 -115:128 2 <
    ef830180 642811492 C Ii:5:001:1 -2:128 0

    Why was the communication stopped after 6 times of transmission ?