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你好，我最近在作一个视频采集卡的驱动时遇到了些问题，
恳请你伸出援助之手，不盛感激。
我的驱动是基于ARM-LINUX的，数据已经可以采集，但采回来的数据经显示之后全
是彩条，不知是驱动的问题还是应用程序的问题。
本人QQ：599180103
驱动程序如下：
#define MODULE
#include <linux/config.h>
#include <linux/version.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include "mytest.h"
#define DEVICE_NAME "mytest"
#define MYTEST_MAJOR 240
#define MAX_SIZE_PER_PICTURE (320*240*2)
#define CAM_PHY_ADDR ((unsigned long)0x24000000)
#define UWORD unsigned short
static int mytest_ioctl(struct inode *inode, struct file *file,
unsigned int cmd,
unsigned long arg);
static UWORD data[ MAX_SIZE_PER_PICTURE>>1 ];
static int mytest_ioctl(struct inode *inode, struct file *file,
unsigned int cmd,
unsigned long arg)
{
UWORD *ptrpic;
switch (cmd) {
case MYTEST_Get_data:{
printk("sizeof short = %d \n", sizeof(UWORD));
ptrpic = (UWORD*) __ioremap( CAM_PHY_ADDR,
MAX_SIZE_PER_PICTURE, 0);
if (ptrpic != NULL){
printk("remap phyaddress 0x%X to virtual
address 0x%X \n",
CAM_PHY_ADDR,
(unsigned long)ptrpic
);
if(copy_to_user((char*)arg, ptrpic,
MAX_SIZE_PER_PICTURE) ) {
__iounmap(ptrpic);
return -1;
}
__iounmap(ptrpic);
}
else {
printk("remap failed !\n");
}
/* if(copy_to_user((char*)arg, data, 2048) )
return -1;*/
break;
}
case MYTEST_Set_Data: {
/*
if(copy_from_user(data, (char*)arg, 2048))
return -EFAULT;*/
break;
}
default:
return 0;
break;
}
return 0;
}
static int mytest_open(struct inode *inode, struct file *file)
{
return 0;
}
static long mytest_read(struct inode *inode, struct file *file, char
*buf, unsigned long count)
{
return 0;
}
/*
* The various file operations we support.
*/
static struct file_operations mytest_fops = {
owner: THIS_MODULE,
ioctl: mytest_ioctl,
open: mytest_open,
};
static devfs_handle_t devfs_handle;
static int __init mytest_init(void)
{
int ret;
int i;
ret = register_chrdev(MYTEST_MAJOR, DEVICE_NAME, &mytest_fops);
if (ret < 0) {
printk(DEVICE_NAME " can't register major number\n");
return ret;
}
devfs_handle = devfs_register(NULL, DEVICE_NAME,
DEVFS_FL_DEFAULT,
MYTEST_MAJOR, 0, S_IFCHR | S_IRUSR |
S_IWUSR, &mytest_fops, NULL);
printk(DEVICE_NAME " initialized\n");
return 0;
}
static void __exit mytest_exit(void)
{
devfs_unregister(devfs_handle);
unregister_chrdev(MYTEST_MAJOR, DEVICE_NAME);
}
module_exit(mytest_exit);
module_init(mytest_init);
MODULE_DESCRIPTION("mytest driver");
MODULE_AUTHOR("Supermi <superligen@gmail.com> ");
MODULE_LICENSE("GPL");
应用程序如下：
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "mytest.h"
#define MYTEST_Set_Data 1
#define MYTEST_Get_data 2
char Data[2048]={0};
char getData[320*240*2]={0};
FILE *f;
int main(int argc, char **argv)
{
int fd;
fd = open("/dev/mytest", 0);
if (fd < 0) {
perror("open device mytest");
exit(1);
}
sprintf(Data, "Hello \n");
/*ioctl(fd, MYTEST_Set_Data, Data);*/
ioctl(fd, MYTEST_Get_data, getData);
f = fopen("pic.dat", "wb+");
// fwrite( getData, 320*240*2, 1, f); ////////
for (int y=0;y<320*240;y++)
{
fwrite( &getData[y*2], 2, 1, f);
}
fclose(f);
close(fd);
printf( "%s",getData);
return 0;
}
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