Hi Laurent:
This OS is quite simple and made by my colleague, it is running on
ARM926ejs, I adopted the driver from our USB IP vendor, and developing USB
layer from USBD, roothub to UVC driver. And I did not using the same user
space app on my FPGA platform. On PC, I am using windows application, on
FPGA, I am using my own simulated test thread to do streaming.( Because I
don't have V4L2 and I dont have app to test UVC device yet)
Here is the simulation thread:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG;
fmt.fmt.pix.width = 160;
fmt.fmt.pix.height = 120;
ret = uvc_v4l2_set_format(&dev->video, &fmt);
if(ret){
dev_err("uvc set format failed %d\n",ret);
}
bufsize = dev->video.streaming->ctrl.dwMaxVideoFrameSize;
n = uvc_alloc_buffers(&dev->video.queue, V4L2_BUFFERS/*5*/, bufsize);
for ( i = 0 ; i < n ; ++i ) {
v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
v4l2_buf.memory = V4L2_MEMORY_MMAP;
v4l2_buf.index = i;
uvc_queue_buffer(&dev->video.queue, &v4l2_buf);
}
ret = uvc_video_enable(&dev->video,1);
if(ret) {
dev_err("video stream enable failed %d\n", ret);
goto done;
}
i = 0;
while(1) {
v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
v4l2_buf.memory = V4L2_MEMORY_MMAP;
v4l2_buf.index = i % n;
uvc_dequeue_buffer(&dev->video.queue, &v4l2_buf, 0);
uvc_queue_buffer(&dev->video.queue, &v4l2_buf);
i++;
if( i > 60 ) {
uvc_video_enable(&dev->video,0);
break;
}
}
done:
uvc_free_buffers(&dev->video.queue);
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Our USB is 2.0 version and my cam compression format is MJPEG..
Thank you for your suggestion Laurent
Brian
--
Best Regards
Brian
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