hzbuffer.c~

基于arm2410的一个简单的液晶屏驱动

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <sys/mman.h>
#include "font_8x16.h"
#define FB_DEV "/dev/fb0"
int fb_open(char *fb_device);
int fb_close(int fd);
void *fb_mmap(int fd,unsigned int screensize);
int fb_munmap(void *start,size_t length);
int fb_16pixel(unsigned char *fbmem,int width,int height,int x,int y,unsigned short color);
void char_display(char *buf,unsigned char *fbmem,unsigned int width,unsigned int height);
int init_file(void);
int get_bit (unsigned char a, int bit);


int fd1;
void *address;

int init_file (void)
{

	fd1 = open ("hzk16.bin", O_RDWR);

	if (fd1 < 0)
	{
		perror ("open() error");
		return -1;
	}

	address = mmap (NULL, 256 * 1024, PROT_READ, MAP_SHARED, fd1, 0);
	if (address == MAP_FAILED)
	{
		perror ("munmap() error=");
	}
}

int close_file (void)
{
	if (munmap (address, 256 * 1024) < 0)
	{
		perror ("munmap() error");
	}

	close (fd1);
}

void get_buf (unsigned char *hanzi, char *buf)
{

	unsigned long offset = ((hanzi[0] - 0xA1) * 94 + (hanzi[1] - 0xA1)) * 32L;

	memcpy (buf, address + offset, 32);
}

int main(int argc,char *argv[])
{
	int fbdev;
	char *fb_device;
	char buf[32];
	unsigned char *fbmem;
	unsigned int screensize;
	unsigned int fb_width;
	unsigned int fb_height;
	unsigned int fb_depth;
	unsigned int x;
	unsigned int y;

	init_file();

	get_buf ("间", buf);

	if((fb_device = getenv("FRAMEBUFFER")) == NULL)
	{
		fb_device = FB_DEV;
	}else printf("%s",fb_device);
	fbdev = fb_open(fb_device);

	fb_width = 1024;
	fb_height = 768;
	fb_depth = 16;

	screensize = fb_width * fb_height *(fb_depth / 8);
	fbmem = fb_mmap(fbdev,screensize);
	/*
	   fb_16pixel(fbmem,fb_width,fb_height,512,384,0xF100);
	   fb_16pixel(fbmem,fb_width,fb_height,511,384,0xF100);
	   fb_16pixel(fbmem,fb_width,fb_height,511,383,0xF100);
	   fb_16pixel(fbmem,fb_width,fb_height,512,383,0xF100);
	   */
	char_display(buf,fbmem,fb_width,fb_height);
	fb_munmap(fbmem,screensize);

	fb_close(fbdev);

	return (0);
}

int get_bit (unsigned char a, int bit)
{
	return (a & (1 << bit));
}



void char_display(char *buf,unsigned char *fbmem,unsigned int width,unsigned int height)
{
	int i,j;
	unsigned char list;
	char a1;
	char a2;
	for (i = 0; i < 32; i += 2)
	{
		a1 = buf[i];
		a2 = buf[i + 1];
		for (j = 7; j >= 0; j--)
		{
			if (get_bit (a1, j))
				fb_16pixel(fbmem,width,height,512 + 7 - j ,384 + i/2, 0xF100);
		}
		for(j = 7; j >= 0; j--)
		{
			if (get_bit (a2, j))
				fb_16pixel(fbmem,width,height,512 + 15 -j ,384 + i/2, 0xF100);
		}
		close_file();
		/*
		   for(n =0;n<32;n+=2)
		   if(n%2 == 0)
		   {
		   for(i = 0;i < 16;i++,n++)
		   {
		   list = buf[n];
		   for(j = 0;j < 8;j++)
		   {
		   if(list & 1 << (8 - j)){
		   fb_16pixel(fbmem,width,height,512 + 2 * j,384 + 2 * i, 0xF100);
		//	fb_16pixel(fbmem,width,height,512 + 2 * j + 1,384 + 2 * i, 0xF100);
		//	fb_16pixel(fbmem,width,height,512 + 2 * j,384 + 2 * i + 1, 0xF100);
		//	fb_16pixel(fbmem,width,height,512 + 2 * j + 1,384 + 2 * i + 1, 0xF100);
		}
		}
		}
		}else{
		for(i = 0;i < 16;i++,n++)
		{
		list = buf[n];
		for(j = 0;j < 8;j++)
		{
		if(list & 1 << (8 - j)){
		fb_16pixel(fbmem,width,height,512 + 8 + 2 * i,384 + 8 + 2 * j, 0xF100);
		}
		}
		}
		}*/
	}
}

int fb_open(char *fb_device)
{
	int fd;
	if((fd = open(fb_device,O_RDWR)) < 0)
	{
		perror(__func__);
		return (-1);
	}
	return (fd);
}

void *fb_mmap(int fd,unsigned int screensize)
{
	void*  fbmem;

	if((fbmem = mmap(0,screensize,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0)) == MAP_FAILED)
	{
		perror(__func__);
		return (void *)(-1);
	}
	return (fbmem);
}

int fb_munmap(void *start,size_t length)
{
	return (munmap(start,length));
}

int fb_close(int fd)
{
	return (close(fd));
}

int fb_16pixel(unsigned char *fbmem, int width,int height,int x,int y,unsigned short color)
{
	if((x > width)||(y > height))
		return (-1);
	unsigned short *dst = ((unsigned short *)fbmem + y * width + x);

	*dst = color;
	return (0);
}