移植usb-camera(ZC0301PLH)
linux3.6.6移植usb-camera(ZC0301PLH)
//--------------------------------------------------------------------------------------------
// 作者：longtian635241（[email protected]）
// 论坛ID：idea6410
// 版权：idea6410
// 平台：友坚idea6410开发板
// 发布日期：2012-11-22
// 最后修改：2012-11-22
//
//----------------------------------------------------------------------------------------------
1、因为内核已经支持这款usbcamera所以只需配置即可！
- Device Drivers --->
- <*> Multimedia support --->
- [*] Cameras/video grabbers support
- [*] Video capture adapters --->
- [*] V4L USB devices --->
- <*> USB Video Class (UVC)
- [*] UVC input events device support
- [*] GSPCA based webcams --->
- <*> 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/video02、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！