【原创】framebuffer测试程序

    #include

    #include

    #include

    #include

    #include

#define fb_write16(b,addr) (*(volatile unsigned short int *) (addr) = (b))

unsigned short int color_lut[16] = 

{

0x0000, /* 0x0000, 0 oúé«*/

0x0015, /* 0x0015,  1 à¶é«*/

0x07f5, /* 0x07F5,  2*/

0xfb40, /* 0xFB40,  3*/

0x0661, /* 0x0661,  4*/

0xd45f, /* 0xD45F,  5*/

0x6af3, /* 0x6A3F,  6*/

0xdefb, /* 0xDEFB,  7*/

0x2570, /* 0x2570,  8*/

0x057f, /* 0x057F,  9*/

0x57ea, /* 0x57EA,  10*/

0x57ff, /* 0x57FF,  11*/

0xf800, /* 0xF800,  12*/

0xfabf, /* 0xFABF,  13*/

0xffea, /* 0xFFEA,  14*/

0xffff, /* 0xFFFF   15*/

};

int fbfd = 0;

char *fbp = 0;

long int location = 0;

struct fb_var_screeninfo vinfo;

struct fb_fix_screeninfo finfo;

void draw_rect();

int main()

{

        int i = 0;

        long int screensize = 0;

       

        // Open the file for reading and writing

        fbfd = open("/dev/fb0", O_RDWR);

        if (!fbfd) {

            printf("Error: cannot open framebuffer device.\n");

            exit(1);

        }

        printf("The framebuffer device was opened successfully.\n");

        // Get fixed screen information

        if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {

            printf("Error reading fixed information.\n");

            exit(2);

        }

        // Get variable screen information

        if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {

            printf("Error reading variable information.\n");

            exit(3);

        }

        printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);

        // Figure out the size of the screen in bytes

        screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;

        // Map the device to memory

        fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,

                           fbfd, 0);

        if ((int)fbp == -1) {

            printf("Error: failed to map framebuffer device to memory.\n");

            exit(4);

        }

        printf("The framebuffer device was mapped to memory successfully.\n");

draw_rect();

        munmap(fbp, screensize);

        close(fbfd);

        return 0;

    }

void draw_rect()

{

unsigned char *dst;

unsigned int location;

int x, y;

printf("line length %d,xoffset %d\n",finfo.line_length,vinfo.xoffset);

for( y = 0; y < vinfo.yres; y++ ) {

for( x = 0; x < vinfo.xres; x++ )

{

location=y*finfo.line_length+(x+vinfo.xoffset)*(vinfo.bits_per_pixel/8);

dst=fbp+location; 

fb_write16(color_lut[x/40], dst);

}

    }

return;

}