framebuffer测试程序

/*

framebuffer简单测试程序 

网上转载 很多次 的程序 :-)

*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <asm/page.h>
#include <linux/fb.h>
#define TRUE 1
#define FALSE 2

typedef struct fbdev{
    int fb;
    unsigned long fb_mem_offset;
    unsigned long fb_mem;
    struct fb_fix_screeninfo fb_fix;
    struct fb_var_screeninfo fb_var;
    char dev[];
} FBDEV, *PFBDEV;

int fb_open(PFBDEV pFbdev)
{
    pFbdev->fb = open(pFbdev->dev, O_RDWR);
    if(pFbdev->fb < )
    {
        printf("Error opening %s: %m. Check kernel config\n", pFbdev->dev);
        return FALSE;
    }
    if (- == ioctl(pFbdev->fb,FBIOGET_VSCREENINFO,&(pFbdev->fb_var)))
    {
        printf("ioctl FBIOGET_VSCREENINFO\n");
        return FALSE;
    }
    if (- == ioctl(pFbdev->fb,FBIOGET_FSCREENINFO,&(pFbdev->fb_fix)))
    {
        printf("ioctl FBIOGET_FSCREENINFO\n");
        return FALSE;
    }

    pFbdev->fb_mem_offset = (unsigned long)(pFbdev->fb_fix.smem_start) & (~PAGE_MASK);
    pFbdev->fb_mem = (unsigned long int)mmap(NULL, pFbdev->fb_fix.smem_len +
            pFbdev->fb_mem_offset,
            PROT_READ | PROT_WRITE, MAP_SHARED, pFbdev->fb, );
    if (-1L == (long) pFbdev->fb_mem)
    {
        printf("mmap error! mem:%ld offset:%ld\n", pFbdev->fb_mem,
                pFbdev->fb_mem_offset);
        return FALSE;
    }

    return TRUE;
}

void fb_close(PFBDEV pFbdev)
{
    close(pFbdev->fb);
    pFbdev->fb=-;
}

void fb_memset (void *addr, int c, size_t len)
{
    memset(addr, c, len);
}

void draw_dot (PFBDEV pFbdev, uint32_t x, uint32_t y, uint8_t r, uint8_t g, uint8_t b)
{
    unsigned int offset;
    if (-1L == (long) pFbdev->fb_mem)
    {
        printf("mmap error! mem:%ld offset:%ld\n", pFbdev->fb_mem,
                pFbdev->fb_mem_offset);
        return;
    }

    offset = y*pFbdev->fb_fix.line_length+*x;
    fb_memset((void*)(pFbdev->fb_mem + pFbdev->fb_mem_offset + offset), b, );
    fb_memset((void*)(pFbdev->fb_mem + pFbdev->fb_mem_offset + offset + ), g, );
}

int main(void)
{
    FBDEV fb;
    memset(&fb, , sizeof(FBDEV));
    strcpy(fb.dev, "/dev/fb0");
    if(fb_open(&fb)==FALSE)
    {
        printf("open frame buffer error\n");
        return ;
    }

    printf("depth(bits per pixel) = %d\n",fb.fb_var.bits_per_pixel);
    printf("smemlen = %d\n",fb.fb_fix.smem_len);
    printf("fix_line(in byte) = %d\n",fb.fb_fix.line_length);

    int i,j;
    for(i=; i<; ++i)
        for(j = ;j<;++j)
        {
            draw_dot(&fb,i,j,0xff,0xff,0xff);
        }

    fb_close(&fb);
    return ;
}