Re: question for soc-camera driver

["冯鑫" <fengxin215@xxxxxxxxx>]

sorry,i trouble you.

2008/5/15 Guennadi Liakhovetski <g.liakhovetski@xxxxxx>:
> What is your <struct pxacamera_platform_data>.mclk_10khz set to? What
> kernel version are you using? I do not know what you do in your FPGA, are
> you sure it doesn't modify your camera bus timing (pixel clock, VSYNC,
> HSYNC, master clock)?

mclk_10khz=1000,and I try 800,500. kernel is linux-2.6.24. I sure it
doesn't modify your camera bus timing.Usually FIFO overrun occur.

> Do you mean camera FIFO overruns occur, but fraims do not get dropped? The
> reason, why with NOR you have more problems might be, that you produce
> extra load on the memory bus? I don't remember id you already told us,
> what type of LCD you have on your system and what other bus masters you
> have? What's your frame format? 640x480x8bit?

My frame format is 752x480x8bit.Now I only capure frame.And I do not
display. the following is my capture thread:
static int dhpa_capture_thread(void)
{
	struct v4l2_buffer buf;
	int frame_cnt;
	static time_t init, end;
	
	while(1)
	{
		/*read frame*/
		memset(&buf, 0, sizeof(buf));
		buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		buf.memory = V4L2_MEMORY_MMAP;	

		/*get the captured buffer*/
		if(-1 == ioctl(fd, VIDIOC_DQBUF, &buf))
		{
			printf( "VIDIOC_DQBUF failed\n ");
			return -1;
		}

		if(-1 == ioctl(fd, VIDIOC_QBUF, &buf))
		{
			printf("VIDIOC_QBUF failed\n");
			return -1;
		}
	}
}
Now if I write a file to jffs2 norflash,FIFO overrun will
occur.Certainly frame is dropped.I only hope you give me some
advice.why do overrun occur when writting norflash.Because I feel
capture frame only use DMA now,I think that write norflash will not
affect DMA.

thanks
fengxin

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