linux framerbuffer测试程序，画一条斜线。适用于480*272的屏幕。

feifeivictor

#include "stdio.h"
#include "unistd.h"
#include "sys/types.h"
#include "sys/stat.h"
#include "fcntl.h"
#include "stdlib.h"
#include "string.h"
#include "sys/mman.h"
#include "linux/fb.h"

#define WIDTH 480
#define HEIGHT 272
#define BYTE_PER_PIXEL 2
#define FB_DEVICE "/dev/fb0"
static unsigned char *fb_mem=NULL;

int init_framebuffer(void)
{
        int fb;
        struct fb_var_screeninfo vinfo;       

        fb=open(FB_DEVICE,O_RDWR);
        ioctl(fb,FBIOGET_VSCREENINFO,&vinfo);
        printf("x %d y %d bpp %d\r\n",vinfo.xres,vinfo.yres,vinfo.bits_per_pixel);
        if(fb<0)
        {
        printf("cannot open frame buffer device\r\n");
        }
        else
        {
        printf("openning frame buffer succeeded\r\n");
        }
        fb_mem=mmap(NULL,WIDTH*HEIGHT*BYTE_PER_PIXEL,PROT_READ|PROT_WRITE,MAP_SHARED,fb,0);
        if(fb_mem>0)
        {
                printf("map framebuffer succeeded\r\n");
        }
        memset(fb_mem,0,WIDTH*HEIGHT*BYTE_PER_PIXEL);
}

void putPixel(unsigned int x,unsigned int y,unsigned int color)
{
        unsigned long offset;
        if(x>=WIDTH)
        {
        x=WIDTH-1;
        }
        if(y>=HEIGHT)
        {
        y=WIDTH-1;
        }
        offset=(y*WIDTH*BYTE_PER_PIXEL)+(x*BYTE_PER_PIXEL);
        *(unsigned short *)(fb_mem+offset)=color;
}

void main()
{
        int i;
       
        init_framebuffer();
        for(i=0;i<100;i++)
        {
        putPixel(i,i,0xff00);
        }
        while(1)
        {
        }
}

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