userdev.c (用户空间驱动程序)

tdh2002

#include stdio.h>
#include stdlib.h>
#include fcntl.h>
#include unistd.h>
#include string.h>
#include sys/time.h>/*settimeofday,gettimeofday,tm time_t结构体*/
#include linux/kd.h>
#include memory.h>
#include sys/ioctl.h>
#include sys/mman.h>
void Sleep(int iSec,int    iUSec)  
{  
    struct timeval    tv;
    tv.tv_sec =    iSec;
    tv.tv_usec = iUSec;
    select(0,NULL,NULL,NULL,&tv);
}
int main()
{
    int fd_mem, i;
    unsigned int map_base;
    if ((fd_mem = open("/dev/mem", O_RDWR | O_SYNC)) == -1) {
        perror("/dev/mem");
        return 1;
    }
    map_base = (unsigned  int)
        mmap(0, 256 * 12, PROT_READ | PROT_WRITE, MAP_SHARED, fd_mem, 0xfffff000);
    *(volatile unsigned int *)(map_base + 512*2) = 0x18;
    *(volatile unsigned int *)(map_base + 512*2 + 0x10) = 0x18;
    *(volatile unsigned int *)(map_base + 512*2 + 0x30) = 0x18;
    *(volatile unsigned int *)(map_base + 512*3) = 0x129;
    *(volatile unsigned int *)(map_base + 512*3 + 0x10) = 0x129;
    *(volatile unsigned int *)(map_base + 512*3 + 0x30) = 0x129;
    for(i=0;i5;i++) {
        *(volatile unsigned int *)(map_base + 512*2 + 0x30) = 0x18;
        *(volatile unsigned int *)(map_base + 512*3 + 0x30) = 0x129;
        printf("PB8 eable=%x out status=%x %x\n",
                *(volatile unsigned int *)(map_base + 512*3 + 0x08),
                *(volatile unsigned int *)(map_base + 512*3 + 0x18),
                *(volatile unsigned int *)(map_base + 512*3 + 0x38));
        Sleep(0,500000);
        *(volatile unsigned int *)(map_base + 512*2 + 0x34) = 0x18;
        *(volatile unsigned int *)(map_base + 512*3 + 0x34) = 0x129;
        printf("PB8 eable=%x out status=%x %x\n",
                *(volatile unsigned int *)(map_base + 512*3 + 0x08),
                *(volatile unsigned int *)(map_base + 512*3 + 0x18),
                *(volatile unsigned int *)(map_base + 512*3 + 0x38));
        Sleep(0,500000);
    }
    close(fd_mem);
}


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