hyj.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 <avr/io.h>
#include <util/delay.h> 


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


uint16 image_count = 0 ,image_all = 0 ;



extern uint16 SectorsPerClust;//每簇扇区数

extern uint8  FAT32_Enable;

void disp_image(void)
  {
    WORD count= 1 ,i =0   ;
	uint8 *buffer ;
	uint8 type ,x , rgb,first ,color_byte,byte1,byte2,byte3 ;
	uint16 y ,color,tmp_color ;
    uint32 p;				//簇指示值			//cluster
	type = 1 ;
	struct FileInfoStruct FileInfo;//文件信息

    struct direntry BMPInfo;	//要播放的mp3文件信息		//the mp3 file item whichi will be played
	
	
	
	if( image_all == 0 )    //读取总图片数
	  {
         image_count =  0 ;
	     byte1 = Search(&BMPInfo,&image_count,&type) ;
		 image_all = image_count ;		 
		 image_count = 1 ;
		 		 
		 /*
	     image_count = 0 ;
         Search(&BMPInfo,&image_count,&type) ;
		 image_all = image_count ;
		 GUI_sprintf_chartohex(10,300,0x00,0xffff,0x0000) ;
		 GUI_sprintf_chartohex(30,300,image_count,0xffff,0x0000) ;
		 GUI_sprintf_chartohex(60,300,image_all,0xffff,0x0000) ;
		 */
	  }
	else  
      {		
          byte1 = Search(&BMPInfo,&image_count,&type) ;
      }	
	 
	 
	 
	p = BMPInfo.deStartCluster+(((uint32)BMPInfo.deHighClust)<<16);//读文件首簇	//the first cluster of the file
	
	x = 0 ;
	y = 319 ;
	rgb = 0 ;
	count = 0 ;
	first = 0 ;
	buffer=malloc(512);	
	while(1)
	 {
		i = 0 ;
	
	    for( ; i < SectorsPerClust ; i++ )      //簇
	     {
	 
	        FAT_LoadPartCluster(p,i,buffer);//读一个扇区	//read a sector
	   
	        if(i==0 && first==0) { count= buffer[0x0a] ; color_byte = buffer[0x1c] / 8  ;  first = 1 ; } 
	        else { count=0 ; }
	   
	        while(count<512)  //读取一簇512扇区 (SectorsPerClust 每簇扇区数)
	          {
		   
		        if(color_byte == 3)   //24位颜色图
		          {
                      switch ( rgb ) 
                        {
			               case 0 : tmp_color = buffer[count]>>3 ;
			                        color |= tmp_color;
					                break ;
					  
			               case 1 : tmp_color = buffer[count]>>2 ;
			                        tmp_color <<= 5 ;
			                        color |= tmp_color ;
					                break ;
					   
       			           case 2 : tmp_color = buffer[count]>>3 ;
			                        tmp_color <<= 11 ;
			                        color |= tmp_color ;
					                 break ;			
			            }
			
                      rgb ++ ;
			      }
		        else
		          {
			          if(color_byte==2)  //16位颜色图
				        {
				          switch ( rgb )
					        {
					          case 0 : byte1 = buffer[count] ;
								       break ; 
								   
						      case 1 :    
								       color = buffer[count] ;
								       color<<=8 ;
								       color |= byte1 ;
								       break ;
					     
					        }
					      rgb ++ ;
				    
				        }
				      else 
				        {
				          if(color_byte==4) //32位颜色图
				            {
				              switch ( rgb )
					            {
					              case 0 :  byte1 = buffer[count] ;
								            break ; 
								   
						          case 1 :  byte2 = buffer[count] ;
                                            break ;
									   
							      case 2 :  byte3 = buffer[count] ;
							                break ;
									   
							      case 3 :  tmp_color = byte1 >> 3 ;
			                                color |= tmp_color;
									        tmp_color = byte2 >>2 ;
			                                tmp_color <<= 5 ;
			                                color |= tmp_color ;
									        tmp_color = byte3 >>3 ;
			                                tmp_color <<= 11 ;
			                                color |= tmp_color ;
									        break ;
					     
					            }
					           rgb ++ ;
				    
				            }
				     
				        }   
			 
			       }
           
		   count ++ ;
		   
		   if(rgb == color_byte)        //读取1像素数数据后显示
		     {
			    GUI_Point(x, y,color) ;
				color = 0x00 ;
			    x++ ;
			    if(x>=240)
				  {
				    y-- ;
					
					if( y<=0 )
		              {
					    
						free(buffer) ;
			            return ;
			          }
					x = 0 ;
				  }
		        
				rgb = 0 ;
			 }
			 
			
		}
	   
	 }  // 读取完一簇数据
	 
	 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 ;
		}
	 
  }
		
	free(buffer) ;
  
 }


//主程序
int main(void)
{
  unsigned char i, x,retry=0;
  uint8 ok,er,r1 ;
  uint32 capacity ;
  unsigned int y ;
  LCD_Init();     //LCD初始化
  x = 0 ;
  y = 0 ;
  GUI_ClearSCR() ;	
  for(i=0 ; i<10 ;i++)
	    {
	      GUI_sprintf_nu(x,y,i,0x07E0,0x0000) ;
		  x+= 10 ;
	    }
		
 ok = 0 ;
 er = 0 ;
 
  OSCCAL = 0x00;//最小RC振荡频率
  delay_us(0xffff);
  MMC_SD_Init();//初始化spi口
  delay_us(0xffff);
  
	  
  while(MMC_SD_Reset())//初始化SD卡					//sd card initialize
	{
		retry++;
		if(retry>20)
		{
			while(1)   //初始化失败显示
			{
				GUI_sprintf_chartobit(120,0,0x55,0xffff,0x0000) ;
				delay_us(0xffff);
				GUI_sprintf_chartobit(120,0,0xaa,0xffff,0x0000) ;
				delay_us(0xffff);
			}
		}
	} 
	  	  
	GUI_sprintf_chartobit(120,0,0xf0,0xffff,0x0000) ; 
    OSCCAL = 0xff;//最大RC振荡频率				//normal operation maximum the frequency

	delay_us(0xffff);	 
	
	if(FAT_Init())//初始化文件系统 支持FAT16和FAT32	//initialize file system  FAT16 and FAT32 are supported
	{
		while(1)
		{
			while(1)
			{
				GUI_sprintf_chartobit(120,0,0x00,0xffff,0x0000) ;
				delay_us(0xffff);
				GUI_sprintf_chartobit(120,0,0xff,0xffff,0x0000) ;
				delay_us(0xffff);
			}
		}

	}
	SearchInit();  //搜索文件初始化
	
	while(1) 
	 {
	    disp_image() ;
		_delay_ms(6000) ;
		                              //Print_hz(72,30,16,"汉字显示测试",0xffff,0x0000) ;
		if(image_count<image_all)
		    {
		      image_count ++ ;
		    }
		 else 
		    {
			  image_count = 1 ;
			} 
		
		
	 }
	
    //LCD_test();    //彩色测试
	 //read_data() ;
	 //GUI_ClearSCR() ;	
	 //LCD_test();    //彩色测试
  	 
    	 


}