problem with usb camera

Hi,

Is there nobody to use Usb camera on DE2 board?

In ISP1362 DateSheet ,it said that ISP1362 support all four type of USB transfers:control,bulk,interrupt,ISOCHRONOUS., and it also support transfer at full-speed and low-speed(not high speed). But the ISOCHRONOUS transfers are defined only for full-speed and high-speed. So it means that in ISO transfer type,we can only use full-speed.

In isp1362-hcd.c, line 1307 (function isp1362_urb_enqueue):

if (type == PIPE_ISOCHRONOUS) {
  ERR("Isochronous transfers not supported\n");
  return -ENOSPC;
    }

So when i run test app:

#include <stdlib.h># include <stdio.h># include <sys/types.h># include <sys/stat.h># include <fcntl.h># include <unistd.h>
int main()
{
    char devname = "/dev/video0";
    printf("Begin device open test......\n");
    printf("Device name: %s\n", devname);
    int hf = open(devname, O_RDWR);
    if(hf < 0)
    {
  perror("Device open test ERROR! : ");
  exit(1);
    }
    close(hf);
    printf("Device open test OK!\n");
    return 0;
}

The error message like this:

/>devopen
Begin device open test.......
Isochronous transfers not supported
deriver/usb/media/ov511.c:init isoc: usb_submit_urb<0> ret -28
Device open test ERROR! : : No space left on device
/>

So i mask the code:

//if (type == PIPE_ISOCHRONOUS) {
  //ERR("Isochronous transfers not supported\n");
  //return -ENOSPC;
    //}

Then the erro message like this:

/>devopen
Begin device open test.......
Device name: /dev/video0
start_iso_transfers:Not enough ISO buffer space for 1023 byte PTD

So I puzzled .......if ISP1362 support ISOCHRONOUS transfer, Why the error happened? Is it because the urb->dev->speed ?

Is there anyone facing the same problem? Pls give me some advice.

Thanks

leewood