text.c

240*320 TFT屏用M16读取SD卡内BMP格式图片.和汉字显示程序(字库也是存在SD卡里

#include "gui.h"
#include "FAT.h"


extern uint16 SectorsPerClust;//每簇扇区数
extern WORD BytesPerSector;	// Bytes per sector  每扇区字节数
extern uint8  FAT32_Enable;

void disp_sector_data(uint8 *da)
 {
   int x,y;
   for(x=0;x<220;x+=20)
     {
	   for(y=0;y<301;y+=20)
	     {
		   GUI_sprintf_chartohex(x,y,*da,0xffff,0x0000) ;  //-----------------------------------------------
		   da ++ ;
		 }
	 }
 
 }





// 显示汉字 使用须先初始化FAT

uint8  Print_text(uint8 x, uint16 y,uint8 size, uint16 bm ,uint16 color,uint16 b_color) 
  {
    uint8 qm ,wm , clust  ,i ,type , byte ;
	uint8 *buffer ;
	uint8 t_x  ;
	uint16 t_y ;
	uint16 count , sector ;
    uint32 offset , p  ;
    struct direntry ZKInfo ;
	
	type = 2 ;  //搜索文件格式 bin
	count = 1 ;
		
	qm = ((uint8)(bm>>8)) - 0xa1 ;   //  0x35
	wm = ((uint8)bm) - 0xa1 ;   //  0x2f 
	
    offset = (uint32) 32 * ( qm * 94 + wm ) ;   //    0x274a0
     
    clust = offset / (SectorsPerClust * BytesPerSector) ;           //计算数据起始簇数 4096  offset / (SectorsPerClust * BytesPerSector)
	sector = offset % (SectorsPerClust * BytesPerSector) / BytesPerSector ;    //计算数据超始扇区  offset % 4096 / 512 ;  
	offset = offset % BytesPerSector ;           //计算数据扇区内偏移
	
	do 
	  {
	     if ( Search(&ZKInfo,&count,&type) ) { return 1 ; }
	  }
	while((ZKInfo.deName[0]=='k') && (ZKInfo.deName[1]=='t') ) ;     //查找文件
	
	p = ZKInfo.deStartCluster+(((uint32)ZKInfo.deHighClust)<<16) ;   //读取首簇位置
    
	
	buffer=malloc(512) ;

		
	while(clust>0)    // 读取数据所在第一簇
	  {
	  
	    free(buffer) ;
	    p=FAT_NextCluster(p);//读下一簇数据			//read next cluster
		buffer=malloc(512) ;

		if(p == 0x0fffffff || p == 0x0ffffff8 || (FAT32_Enable == 0 && p == 0xffff))//如果无后续簇则结束，	//no more cluster
		  {
		        
				return 0 ;
		  }
		 
		clust -- ;
	  
	  }
	  
		  
	  
	FAT_LoadPartCluster(p,sector,buffer);//读一个扇区	//read a sector
	
    for( t_y=y ; t_y<y+16 ; t_y++  )
	  {
	    
	  
		for( byte=x ; byte < x+9 ; byte+=8 ) 
          {  
		     for( t_x=byte,i=0 ; t_x<byte+8 ;t_x++,i++ )
				   {
				      if((buffer[offset]&(0x80>>i))==(0x80>>i))
					    {
			              GUI_Point(t_x,t_y,color) ;
						}
					  else  
					    {
						  GUI_Point(t_x,t_y,b_color) ;
						}
				   }
				  
		     
			 
		     if(offset<512)
			   {
			     offset ++ ;
			   }
			  else 
			   {
			     sector ++ ;
				 offset = 0 ;
		         if(sector>=0x08)      //---------------------
			        {
				      sector = 0 ;
					  
					  free(buffer) ;
					  p=FAT_NextCluster(p);//读下一簇数据			//read next cluster
					  buffer=malloc(512) ;
		              
					  
	                  if(p == 0x0fffffff || p == 0x0ffffff8 || (FAT32_Enable == 0 && p == 0xffff))//如果无后续簇则结束，	//no more cluster
		                {
						   free(buffer) ;
				           return 0 ;
		                }
					  
					  FAT_LoadPartCluster(p,sector,buffer);//读一个扇区	//read a sector  
				  
				    }
			     else  
			        {
					  FAT_LoadPartCluster(p,sector,buffer);//读一个扇区	//read a sector  
				    }
				}
		   
		   }
		 
	  }	
	  
	 free(buffer) ;
	 return 0 ;
 	
  }
  
  
  
  
  
void Print_hz(uint8 x, uint16 y,uint8 size, uint8 *bm ,uint16 color,uint16 b_color)  
 { 
   uint8 qm,wm ;
   uint16 hz_bm ;
  
    while(*bm!=0x00)
	  {
	    qm = *bm++ ;
		wm = *bm++ ;
		hz_bm = qm  ;
		hz_bm <<= 8 ;
		hz_bm += wm ;
	    Print_text(x, y,size, hz_bm ,color,b_color) ;
		x+= size ;
	  }
  
 }