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📄 fbtools.h.bak

📁 本人收集的framebuffer资料
💻 BAK
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#ifndef _FBTOOLS_H_
#define _FBTOOLS_H_

#include <linux/fb.h>

/a framebuffer device structure;
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[20];
} FBDEV, *PFBDEV;

/open & init a frame buffer
/to use this function,
/you must set FBDEV.dev=\"/dev/fb0\"
/or \"/dev/fbX\"
/it\'s your frame buffer.
int fb_open(PFBDEV pFbdev);

/close a frame buffer
int fb_close(PFBDEV pFbdev);

/get display depth
int get_display_depth(PFBDEV pFbdev);


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

#endif



fbtools.c

代码:
#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;
}

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