fbtools.c.bak

本人收集的framebuffer资料

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <asm/page.h>

#include "fbtools.h"

#define TRUE 1
#define FALSE 0
#define MAX(x,y) ((x)>(y)?(x):(y))
#define MIN(x,y) ((x)<(y)?(x):(y))

//open & init a frame buffer
int fb_open(PFBDEV pFbdev)
{
pFbdev->fb = open(pFbdev->dev, O_RDWR);
if(pFbdev->fb < 0)
		{
		printf("Error opening %s: %m. Check kernel config\n", pFbdev->dev);
		return FALSE;
		}
if (-1 == ioctl(pFbdev->fb,FBIOGET_VSCREENINFO,&(pFbdev->fb_var)))
		{
		printf("ioctl FBIOGET_VSCREENINFO\n");
		return FALSE;
		}
if (-1 == ioctl(pFbdev->fb,FBIOGET_FSCREENINFO,&(pFbdev->fb_fix)))
		{
		printf("ioctl FBIOGET_FSCREENINFO\n");
		return FALSE;
		}

//map physics address to virtual address
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, 0);
if (-1L == (long) pFbdev->fb_mem) 
		{
		printf("mmap error! mem:%d offset:%d\n", pFbdev->fb_mem, pFbdev->fb_mem_offset);
		return FALSE;
		}

return TRUE;
}

//close frame buffer
int fb_close(PFBDEV pFbdev)
{
	close(pFbdev->fb);
	pFbdev->fb=-1;
}

//get display depth
int get_display_depth(PFBDEV pFbdev);
{
	if(pFbdev->fb<=0)
	{
	printf("fb device not open, open it first\n");
	return FALSE;
	}
return pFbdev->fb_var.bits_per_pixel;
}

//full screen clear
void fb_memset (void *addr, int c, size_t len)
{
memset(addr, c, len);
}

//use by test
#define DEBUG


main()
{
FBDEV fbdev;
memset(&fbdev, 0, sizeof(FBDEV));
strcpy(fbdev.dev, "/dev/fb0");
if(fb_open(&fbdev)==FALSE)
{
printf("open frame buffer error\n");
return;
}

//fb_memset(fbdev.fb_mem + fbdev.fb_mem_offset, 0, fbdev.fb_fix.smem_len);

fb_close(&fbdev);
}