linux3.6.6移植usb-camera(ZC0301PLH)

1、因为内核已经支持这款usbcamera所以只需配置即可！

1. Device Drivers --->
2. <*> Multimedia support --->
3. [*]   Cameras/video grabbers support 
4. [*]   Video capture adapters  --->
5. [*] V4L USB devices --->
6. <*> USB Video Class (UVC)
7. [*] UVC input events device support
8. [*] GSPCA based webcams --->
9. <*>   ZC3XX USB Camera Driver
   插入USB摄像头（我使用的UVC摄像头），会提示：
   
   
   usb 1-1: new full-speed USB device number 7 using s3c2410-ohci
   usb 1-1: New USB device found, idVendor=0ac8, idProduct=303b
   usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
   usb 1-1: Product: PC Camera
   usb 1-1: Manufacturer: Vimicro Corp.
   gspca_main: gspca_zc3xx-2.14.0 probing 0ac8:303b
   input: gspca_zc3xx as /devices/platform/s3c2410-ohci/usb1/1-1/input/input3
   查看设备：
   [root@urbetter /]# ls dev/video0
   dev/video0
   2、测试：
   #include <stdio.h>
   #include <stdlib.h>
   #include <string.h>
   #include <assert.h>
   #include <getopt.h>           
   #include <fcntl.h>            
   #include <unistd.h>
   #include <errno.h>
   #include <malloc.h>
   #include <sys/stat.h>
   #include <sys/types.h>
   #include <sys/time.h>
   #include <sys/mman.h>
   #include <sys/ioctl.h>
   #include <asm/types.h>        
   #include <linux/videodev2.h>
   #define CLEAR(x) memset (&(x), 0, sizeof (x))
   struct buffer {
           void *                  start;
           size_t                  length;
   };
   static char *           dev_name        = "/dev/video0";//这个的根据你查看到的设备好修改为你的！
   static int              fd              = -1;
   struct buffer *         buffers         = NULL;
   FILE *file_fd;
   static unsigned long file_length;
   static unsigned char *file_name;
   int main (int argc,char ** argv)
   {
   struct v4l2_capability cap;
   struct v4l2_format fmt;
   file_fd = fopen("test.jpg", "w");
   fd = open (dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);
   ioctl (fd, VIDIOC_QUERYCAP, &cap);
   CLEAR (fmt);
   fmt.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;
   fmt.fmt.pix.width       = 640;
   fmt.fmt.pix.height      = 480;
   fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
   fmt.fmt.pix.field       = V4L2_FIELD_INTERLACED;
   ioctl (fd, VIDIOC_S_FMT, &fmt);
   file_length = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
   buffers = calloc (1, sizeof (*buffers));
   buffers[0].length = file_length;
   buffers[0].start = malloc (file_length);
   for (;;)
   {
      fd_set fds;
      struct timeval tv;
      int r;
      FD_ZERO (&fds);
      FD_SET (fd, &fds);
      /* Timeout. */
      tv.tv_sec = 3;
      tv.tv_usec = 0;
      r = select (fd + 1, &fds, NULL, NULL, &tv);
      if (-1 == r) {
       if (EINTR == errno)
        continue;
       printf ("select");
                           }
      if (0 == r) {
       fprintf (stderr, "select timeout\n");
       exit (EXIT_FAILURE);
                           }
      if (read (fd, buffers[0].start, buffers[0].length))
      break;
   }
   fwrite(buffers[0].start, buffers[0].length, 1, file_fd);
   free (buffers[0].start);
   close (fd);
   fclose (file_fd);
   exit (EXIT_SUCCESS);
   return 0;
   }
   编译：
   # arm-linux-gcc usb_camera.c -o usb_camera
   拷贝到文件系统中运行即可，在当前目录下就能看到test.jpg的图片！

Ref : http://blog.csdn.net/longtian635241/article/details/8308136