lcd_gbk.c

ATmega64单片机

/*****************************************************/
/*            File name : LCD_GBK.c                                              */
/* Description : code for displaying a GBK characters,                 */
/* Platform     : AVRStudio4.13 + WinAVR20070525  for AVR     */
/* Author       : Michael Zhang - 章其波                            */
/* Email         : [e-mail]                                          */
/* MSN          : [e-mail]                          */
/* Date          : 2007-1-2                                                    */
/* NOT FOR COMMERCIAL USE,     ALL RIGHT RESERVED!         */
/*****************************************************/
/* Change Log:                                                                      */
/*                   20071109: add a faster display function for 3310 */
/*                   20070102: original version                                 */
/*****************************************************/


#include"LCD_GBK.h"

unsigned long GBK12,GBK16,GBK2UNI,UNI2GBK;//用于存放四个文件的起始扇区
extern unsigned long FirstDataSector;//第一个数据扇区
extern unsigned int SectorsPerClust;//每簇扇区数
extern unsigned int  BytesPerSector;//每扇区字节数

unsigned char GBK_Buffer[32];//单个汉字点阵数据缓冲

unsigned char GBK_Ini()//gbk初始化
{
	GBK12 = FAT_Open("\\st12.sys");//打开文件，得到簇号
	if(GBK12 == 1)return 1;
	GBK16 = FAT_Open("\\st16.sys");
	if(GBK16 == 1)return 1;
GBK2UNI = FAT_Open("\\gbk2uni.sys");
	if(GBK2UNI == 1)return 1;
	UNI2GBK = FAT_Open("\\uni2gbk.sys");
	if(UNI2GBK == 1)return 1;

	//将簇号转成扇区号
	GBK12 = (unsigned long)FirstDataSector+(unsigned long)(GBK12 - 2)*(unsigned long)SectorsPerClust;//calculate the actual sector number
	GBK16 = (unsigned long)FirstDataSector+(unsigned long)(GBK16 - 2)*(unsigned long)SectorsPerClust;//calculate the actual sector number
	GBK2UNI = (unsigned long)FirstDataSector+(unsigned long)(GBK2UNI - 2)*(unsigned long)SectorsPerClust;//calculate the actual sector number
	UNI2GBK = (unsigned long)FirstDataSector+(unsigned long)(UNI2GBK - 2)*(unsigned long)SectorsPerClust;//calculate the actual sector number

	return 0;
}

unsigned char Unicode_to_GBK(unsigned char *ch)
{
	unsigned int temp;
	unsigned int sector_offset;//扇区偏移
	unsigned int byte_offset;//字节偏移
	unsigned char buffer[512];
	temp = *((unsigned int*)ch);//由于FAT中文件民unicode码是 地字节在前，所以要按uint型读
	temp -= 0x4e00;//减去基础数据
	temp *= 2;//每个汉字两个字节
	sector_offset = temp/BytesPerSector;//计算出扇区偏移，确定存在哪个扇区
	byte_offset = temp%BytesPerSector;//存在哪个字节
	if(FAT_ReadSector(UNI2GBK + sector_offset,buffer))return 1;//读那个扇区
	*ch = buffer[byte_offset];//将数据读出
	*(ch+1) = buffer[byte_offset+1];
	return 0;
}

unsigned char GBK_to_Unicode(unsigned char *ch)
{
	return 0;
}

unsigned char Read_One_GBK12(unsigned char *ch)
{
	unsigned long temp1;
	unsigned char temp2;
	unsigned int  sector_offset;
	unsigned int  byte_offset;
	unsigned char buffer[512];
	temp1=*ch;
	temp2=*(ch+1);
	if(temp1<0x81||temp2<0x40)return 1;
	temp1-=0x81;
	temp2-=0x40;
	temp1*=192;//xx7f and xxff are included
	temp1+=temp2;
	temp1*=24;
	sector_offset = temp1/BytesPerSector;
	byte_offset = temp1%BytesPerSector;
	if(FAT_ReadSector(GBK12 + sector_offset,buffer))return 1;
	if(byte_offset>488)
	{
		for(temp2 = 0,temp1 = byte_offset;temp2<(BytesPerSector - byte_offset);temp2++,temp1++)GBK_Buffer[temp2] = buffer[temp1];
		if(FAT_ReadSector(GBK12 + sector_offset + 1,buffer))return 1;
		for(temp1 = 0;temp2<24;temp2++,temp1++)GBK_Buffer[temp2] = buffer[temp1];
	}
	else for(temp2 = 0,temp1 = byte_offset;temp2<24;temp2++,temp1++)GBK_Buffer[temp2] = buffer[temp1];
	return 0;
}
unsigned char Read_One_GBK16(unsigned char *ch)
{
	unsigned int  temp1;
	unsigned char temp2;
	unsigned int  sector_offset;//扇区偏移
	unsigned int  byte_offset;//字节偏移
	unsigned char buffer[512];
	temp1=*ch;
	temp2=*(ch+1);
	if(temp1<0x81||temp2<0x40)return 1;//不合法的汉字
	temp1-=0x81;//的到类似于2312的区号
	temp2-=0x40;//位号
	temp1*=192;//xx7f and xxff are included
	temp1+=temp2;//得到偏移
	//temp1*=24;
	sector_offset = temp1/(BytesPerSector/32);//算出要读哪个扇区
	byte_offset = (temp1%(BytesPerSector/32))*32;//算出要读扇区的哪个字节
	if(FAT_ReadSector(GBK16 + sector_offset,buffer))return 1;//读要读的扇区
	for(temp2 = 0,temp1 = byte_offset;temp2<32;temp2++,temp1++)GBK_Buffer[temp2] = buffer[temp1];//复制要复制的数据
	return 0;
}

unsigned char Dis_GBK12_fast(unsigned int x,unsigned int y,unsigned char *ch)
{
	unsigned int i,j;
	unsigned char temp;

       extern unsigned char disBuf[504];
// disBuf[(y/8)*84 + x +i] = temp;
        j = y/12;
        if(Read_One_GBK12(ch))return 1;

        if(j==0)
            {
                for(i=x;i<x+12;i++)
                    {
                        temp = GBK_Buffer[i-x];
                        disBuf[i] = temp;
                    }
                for(i=x+84;i<x+84+12;i++)
                    {
                        temp = GBK_Buffer[i-x-84+12];
                        disBuf[i] &= 0xf0;
                        disBuf[i] |= (temp & 0x0f);
                    }
            }
        else if(j==1)
            {
                 for(i=x+84;i<x+84+12;i++)
                    {
                        temp = GBK_Buffer[i-x-84];
                        disBuf[i] &= 0x0f;
                        disBuf[i] |= ((temp<<4) & 0xf0);
                    }
                for(i=x+168;i<x+168+12;i++)
                    {
                        temp = GBK_Buffer[i-x-168]>>4;
                        temp += GBK_Buffer[i-x+12-168]<<4;
                        disBuf[i] = temp;
                    }
            }
        else if(j==2)
           {
                for(i=x+252;i<x+12+252;i++)
                    {
                        temp = GBK_Buffer[i-x-252];
                        disBuf[i] = temp;
                    }
                for(i=x+336;i<x+336+12;i++)
                    {
                        temp = GBK_Buffer[i-x+12-336];
                        disBuf[i] &= 0xf0;
                        disBuf[i] |= (temp & 0x0f);
                    }
            }
        else if(j==3)
            {
                 for(i=x+336;i<x+336+12;i++)
                    {
                        temp = GBK_Buffer[i-x-336];
                        disBuf[i] &= 0x0f;
                        disBuf[i] |= ((temp<<4) & 0xf0);
                    }
                for(i=x+420;i<x+420+12;i++)
                    {
                        temp = GBK_Buffer[i-x-420]>>4;
                        temp += GBK_Buffer[i-x+12-420]<<4;
                        disBuf[i] = temp;
                    }
            }
        return 0;
}

unsigned char Dis_GBK12(unsigned int x,unsigned int y,unsigned char *ch)
{
	unsigned char i,j;
	unsigned char temp;
	if(Read_One_GBK12(ch))return 1;
	for(i=0;i<12;i++)
	{
		temp = GBK_Buffer[i];
		for(j=0;j<8;j++)
		{
			if(temp&(1<<j))OnePixel(x+i,y+j,1);
			else OnePixel(x+i,y+j,0);
		}
	}
	for(i=0;i<12;i++)
	{
		temp = GBK_Buffer[i + 12];
		for(j=0;j<4;j++)
		{
			if(temp&(1<<j))OnePixel(x+i,y+j+8,1);
			else OnePixel(x+i,y+j+8,0);
		}
	}
	return 0;
}
unsigned char Dis_GBK16(unsigned int x,unsigned int y,unsigned char *ch)
{
	unsigned char i,j;
	unsigned char temp;
	if(Read_One_GBK16(ch))return 1;
	for(i=0;i<16;i++)
	{
		temp = GBK_Buffer[i];
		for(j=0;j<8;j++)
		{
			if(temp&(1<<j))OnePixel(x+i,y+j,1);
			else OnePixel(x+i,y+j,0);
		}
	}
	for(i=0;i<16;i++)
	{
		temp = GBK_Buffer[i + 16];
		for(j=0;j<8;j++)
		{
			if(temp&(1<<j))OnePixel(x+i,y+j+8,1);
			else OnePixel(x+i,y+j+8,0);
		}
	}
	return 0;
}