硬件准备
ADSP-EDU-BF533:BF533开发板
 AD-HP530ICE:ADI DSP仿真器
软件准备
Visual DSP++软件
硬件链接

功能介绍
代码实现了读取 SD 卡中“/txt/test.txt”路径下的 TXT 文件,将 TXT 文件内容显示到液晶屏上,通过按键“Lift->UP”和“Lift->Down”进行上下翻页。
代码读取 TXT 文档后,会根据读取的数据信息,将数据信息及格式进行判断,将内容通过调用字库显示到液晶屏上,并将每一页的地址保存在页数组中,在上下翻页时,会根据保存的信息找到以前的页面。
代码使用说明
代码主要调用了文件系统函数和 TXT 文档解析函数,文件系统将 SD 卡内指定路径下的测试文件打开并读取,TXT 解析函数将数据进行解析,并将相应的文字调入液晶显示内存中,并做了自动换行、换页、向上翻页的机制。
display_txt(unsigned char *pbuff,WORD len,int color)
 将 pbuff 指针指向的地址数据调用并解析显示,调用长度参数为 len,颜色参数为 color。
代码实验步骤
- 将 SD 卡根目录下的 TXT 文件夹中,保存一个叫做”test.txt”的文件,文件中写入要显示的内容或小说。
 - 将 SD 卡插入开发板 SD 卡接口。
 - 编译并运行代码,待提示“开始阅读电子书,按按键翻页查看”时,按下“Lift->Down”按键,通过“Lift->Down”
和“Lift->UP”按键可进行上下翻页。 
代码实验结果
在液晶屏上可以看到 test.txt 文件的文字内容。
程序源码
cpu.c
#include <cdefBF533.h>
void Set_PLL(int pmsel,int pssel)
 {
 int new_PLL_CTL; 
 *pPLL_DIV = pssel;
 asm(“ssync;”);
 new_PLL_CTL = (pmsel & 0x3f) << 9; 
 *pSIC_IWR |= 0xffffffff;
 if (new_PLL_CTL != *pPLL_CTL)
 {
 *pPLL_CTL = new_PLL_CTL;
 asm(“ssync;”);
 asm(“idle;”);
 }
 }
void Init_SDRAM(void)
 {
 *pEBIU_SDRRC = 0x00000817; 
 *pEBIU_SDBCTL = 0x00000013;
 *pEBIU_SDGCTL = 0x0091998d;
 ssync(); 
 }
void Init_EBIU(void)
 {
 *pEBIU_AMBCTL0 = 0x7bb07bb0;
 *pEBIU_AMBCTL1 = 0x7bb07bb0;
 *pEBIU_AMGCTL = 0x000f;
 }
void Init_Timers0(int dat)
 {
 *pTIMER0_CONFIG = 0x0019;
 *pTIMER0_WIDTH = dat;
 *pTIMER0_PERIOD = 2000;
 }
void Enable_Timers0(void)
 {
 *pTIMER_ENABLE|= 0x0001;
 asm(“ssync;”);
 }
void Disable_Timers0(void)
 {
 *pTIMER_DISABLE |= 0x0001; 
 }
void delay(volatile int tem)
 {
 volatile int i;
 while(tem–)
 for(i=6; i>0; i–);
 }
diskio.c
#include “diskio.h”
 #include “stdio.h”
 #include <cdefBF533.h>
void MMC_HardwareInitial(void)
 {
 *pSPI_FLG = FLS2;
 *pSPI_BAUD = 550;
 *pSPI_CTL = 0x0000;
 *pSPI_CTL = 0x0001 | MSTR ;
 *pSPI_CTL = (*pSPI_CTL | SPE);
 }
DSTATUS disk_initialize ()
 {
 MMC_HardwareInitial();
 MMC_Init();
 return 0;
 }
DSTATUS disk_shutdown ()
 {
 return 0;
 }
 DSTATUS disk_status ()
 {
 return 0;
 }
DRESULT disk_read (BYTE *buff, DWORD sect, BYTE cnt)//cnt = sector num
 {
 // fseek(fp ,sect, SEEK_SET);
 // fread(buff, 512, cnt, fp);
while(cnt--){
	MMC_read_sector(sect,buff);
	sect += 1;
	buff += 512;
}
return 0;
 
}
 #ifndef _READONLY
 DRESULT disk_write (const BYTE* buff, DWORD sect, BYTE cnt)
 {
 // fseek(fp ,sect, SEEK_SET);
 // fwrite(buff, 512, cnt, fp);
 while(cnt–){
 MMC_Write_sector(sect,buff);
 sect += 1;
 buff += 512;
 }
 return 0;
 }
 #endif
tftlcd.c
#include <cdefBF533.h>
section(“sdram0_bank1”) unsigned char DisplayBuffer[272][1440] ;
 section(“sdram0_bank1”) unsigned char DisplayBuffer_565[272][1440] ;
 section(“sdram0_bank1”) unsigned char TempBuffer_img[272][1440] ;
 section(“sdram0_bank1”) unsigned char Inputdata[391734];
void InitDMA(void)
 {
 int addr;
 addr = &DisplayBuffer_565;
 addr -= 1920;
 *pDMA0_START_ADDR = addr;
*pDMA0_X_COUNT = 480;
*pDMA0_X_MODIFY = 2;
*pDMA0_Y_COUNT = 286;
*pDMA0_Y_MODIFY = 2;	
*pDMA0_CONFIG = 0x1034;
 
}
void InitPPI(void)
 {
 *pPPI_CONTROL = 0x781e; 
 *pPPI_DELAY = 0; 
 *pPPI_COUNT = 479; 
 *pPPI_FRAME = 286; 
 }
void InitTimer(void)
 {
 *pTIMER1_PERIOD = 525;
 *pTIMER1_WIDTH = 41;
 *pTIMER1_CONFIG = 0x00a9;
 *pTIMER2_PERIOD = 150150;
 *pTIMER2_WIDTH = 5250;
 *pTIMER2_CONFIG = 0x00a9;
 }
void PPI_TMR_DMA_Enable(void)
 {
 *pDMA0_CONFIG |= 0x1;
 asm(“ssync;”);
 InitTimer(); 
 *pPPI_CONTROL |= 0x1; 
 asm(“ssync;”);
 *pTIMER_ENABLE|= 0x0006;
 asm(“ssync;”);
 }
void PPI_TMR_DMAR_Disable(void)
 {
 *pDMA0_CONFIG &= (~0x1);
 *pPPI_CONTROL &= (~0x1);
 }
void bgrtorgb24(void)
 {
 int i,j;
 int a,b,c;
 for(i=0;i<272;i++)
 {
 for(j=0;j<1440;j++)
 {
 TempBuffer_img[i][j] = Inputdata[i1440+j+54]; 
 }
 }
 for(i=0;i<272;i++)
 {
 for(j=0;j<480;j++)
 {
 a = TempBuffer_img[i][j3];
 b = TempBuffer_img[i][j3+1];
 c = TempBuffer_img[i][j3+2]; 
 TempBuffer_img[i][j3] = c;
 TempBuffer_img[i][j3+1] = b;
 TempBuffer_img[i][j*3+2] = a;
 }
 }
for(i=0;i<272;i++)
{
	for(j=0;j<1440;j++)
	{
		DisplayBuffer[i][j] = (TempBuffer_img[271-i][j]); 
	}
}
 
}
void color_bar(void)
 {
 int i,j;
	for(i=0;i<272;i++)
{
	for(j=0;j<40;j++)
		{
			DisplayBuffer[i][j*3+0] = 0x00;
			DisplayBuffer[i][j*3+1] = 0x00;
			DisplayBuffer[i][j*3+2] = 0x00;
		}
	for(j=40;j<80;j++)
		{
			DisplayBuffer[i][j*3+0] = 0xff;
            DisplayBuffer[i][j*3+1] = 0x00;                                                                                                                                                                                                                                                                                               				DisplayBuffer[i][j*3+1] = 0x00;
			DisplayBuffer[i][j*3+2] = 0x00;//red
		}
	for(j=80;j<120;j++)
		{
			DisplayBuffer[i][j*3+0] = 0x00;
			DisplayBuffer[i][j*3+1] = 0xff;
			DisplayBuffer[i][j*3+2] = 0x00;//green
		}
	for(j=120;j<160;j++)
		{
			DisplayBuffer[i][j*3+0] = 0x00;
			DisplayBuffer[i][j*3+1] = 0x00;
			DisplayBuffer[i][j*3+2] = 0xff;//blue
		}
	for(j=160;j<200;j++)
		{
			DisplayBuffer[i][j*3+0] = 0xff;
			DisplayBuffer[i][j*3+1] = 0xff;
			DisplayBuffer[i][j*3+2] = 0x0;//red+green
		}
	for(j=200;j<240;j++)
		{
			DisplayBuffer[i][j*3+0] = 0x00;
			DisplayBuffer[i][j*3+1] = 0xff;
			DisplayBuffer[i][j*3+2] = 0xff;//red+blue
		}
	for(j=240;j<280;j++)
		{
			DisplayBuffer[i][j*3+0] = 0xff;
			DisplayBuffer[i][j*3+1] = 0x00;
			DisplayBuffer[i][j*3+2] = 0xff;//green+blue
		}
	for(j=280;j<320;j++)
		{
			DisplayBuffer[i][j*3+0] = 0xff;
			DisplayBuffer[i][j*3+1] = 0xff;
			DisplayBuffer[i][j*3+2] = 0xff;
		}
		
	for(j=320;j<360;j++)
		{
			DisplayBuffer[i][j*3+0] = 0x00;
			DisplayBuffer[i][j*3+1] = 0xff;
			DisplayBuffer[i][j*3+2] = 0x00;//green
		}
	for(j=360;j<400;j++)
		{
			DisplayBuffer[i][j*3+0] = 0x00;
			DisplayBuffer[i][j*3+1] = 0x00;
			DisplayBuffer[i][j*3+2] = 0xff;//blue
		}
	for(j=400;j<440;j++)
		{
			DisplayBuffer[i][j*3+0] = 0xff;
			DisplayBuffer[i][j*3+1] = 0xff;
			DisplayBuffer[i][j*3+2] = 0x0;//red+green
		}
	for(j=440;j<480;j++)
		{
			DisplayBuffer[i][j*3+0] = 0x00;
			DisplayBuffer[i][j*3+1] = 0xff;
			DisplayBuffer[i][j*3+2] = 0xff;//red+blue
		}
	}		
 
}
void RGB888_RGB565(unsigned char *src, int src_len, unsigned char *dst)
 {
 int i = 0;
 int j = 0;
if (src_len % 3 != 0)
{
    return;
}
for (i = 0; i < src_len; i += 3)
{
     dst[j+1] = src[i+2] &0xf8; 			//B 
     dst[j+1] |= ((src[i+1]>>5) & 0x07);	//GH
     dst[j] = ((src[i+1]<<3) & 0xe0);  		//GL  
     dst[j] |= ((src[i]>>3) &0x1f); 		//R
    j += 2;  
    
}
 
}
ziku.c
#include “ascii16_8.h”
 #include “hzk16.h”
extern unsigned char DisplayBuffer[272][1440];
void PutPixel(int x,int y,unsigned int color)
 {
 if((x<480)&&(y<272))
 {
 DisplayBuffer[y][3x] = (color>>16)&0xff;
 DisplayBuffer[y][3x+1] = (color>>8)&0xff;
 DisplayBuffer[y][3*x+2] = (color)&0xff;
 }
 }
/以特定颜色填充一块区域/
 void Rect(int x,int y,int width,int high,unsigned int color)
 {
 int i,j;
 // for(i=y;i<y+high+4;i++) //加上暗线4条
 for(i=y;i<y+high;i++)
 {
 for(j=x;j<(x+width);j++)
 {
 DisplayBuffer[i][3j] = (color>>16)&0xff;
 DisplayBuffer[i][3j+1] = (color>>8)&0xff;
 DisplayBuffer[i][3*j+2] = (color)&0xff;
 }
 }
 }
//水平方向显示字符串
 void Glib_disp_ascii16x8_v(int x,int y,char *s,int colour)
 {
int i,j,k;
while(*s)
{
   for(i=0;i<91;i++)
   {
      if(*s==ASCII_16x8[i].Index)
      {
          for (j=0;j<16;j++)
          {
              for(k=0;k<8;k++)
              {
                  if(  ((ASCII_16x8[i].ASCII_Dot[j]>>(7-k)) & 0x1)!=0 )
   				  {
   				      PutPixel(x+k,y+j,colour);  //加4条暗线
   				  }
              }
          }
        
        
       }
    } 
    
    s+=1;											
	x+=8;
 }      
 
}
//显示汉字
 void Glib_disp_hzk16_v(int x,int y,char s,int colour)
 {
 char buffer[32]; / 32字节的字模缓冲区 */
 int i,j,k;
 unsigned char qh,wh;
 unsigned long location;
while(*s)
{
	qh=*s-0xa0;								/* 计算区码					*/
	wh=*(s+1)-0xa0;							/* 计算位码					*/
	location=(94*(qh-1)+(wh-1))*32L;		/* 计算字模在文件中的位置	*/
	memcpy(buffer, &__HZK16X16__[location], 32);	/* 获取汉字字模				*/
	for(i=0;i<16;i++)						/* 每一行					*/
	{
		for(j=0;j<2;j++)					/* 一行两个字节				*/
		{
 			for(k=0;k<8;k++)				/* 每个字节按位显示			*/
			{
  				if(((buffer[i*2+j]>>(7-k)) & 0x1) != 0)
   				//	PutPixel(x+8*(j)+k,y+4+i,colour); /* 显示一位	*/
   					PutPixel(x+8*(j)+k,y+i,colour);
			}
		}
	}
	s+=2;												/* 下一个汉字	*/
	x+=16;												/* 汉字间距		*/
}
 
}
void Mouse(int x,int y,int color)
 {
 int i,j,k;
for (i=0;i<16;i++)
{
	for(j=0;j<2;j++)
	{	
	    for(k=0;k<8;k++)
	    {
	         if(  ((mouse[i*2+j]>>(7-k)) & 0x1)!=0 )
		     {
		         PutPixel(x+8*j+k,y+i,color);
		     }
	   }
	}
}
 
}
main.c
#include <cdefBF533.h>
 #include “integer.h”
 #include “ff.h”
FIL infile, outfile;
 FRESULT retval = 0;
extern unsigned char DisplayBuffer[272][1440] ;
 extern unsigned char DisplayBuffer_565[272][1440] ;
 extern unsigned char Inputdata[];
 unsigned char buffer[0x200000];
 unsigned char zixing_code[2];
unsigned int keydata=0;
 unsigned int lenth;
 unsigned int read_addr = 0;
 unsigned int old_addr[100];
 unsigned int page=0;
 unsigned int end_flag = 0;
 unsigned int count = 0;
 unsigned int file_count[1]; 
 unsigned int dir_count[1];
 unsigned char file_name[100][12];
 unsigned char dir_name[50][12];
display_txt(unsigned char *pbuff,WORD len,int color)
 {
 unsigned int x=0,y=0;
 int i;
memset(DisplayBuffer,'\0',391680);				
for(i=0;i<len;i++)
{
	zixing_code[0]  = pbuff[i];
	if(zixing_code[0]<127)
	{
		if(zixing_code[0] == 0x0d)
		{
			zixing_code[1]  = pbuff[i+1];
			if(zixing_code[1] == 0x0a)
			{
				x = 0;
				y+=16;
			}
		}
		else
		{
			zixing_code[1] = 0;
			if(x>(479-7))
			{
				x = 0;
				y+=16;
			}
			if(y>(271-15))
			{
				y = 0;
				x =0;
				page = i-1;
				break;
			}	
			Glib_disp_ascii16x8_v(x,y,zixing_code,color);
			x+=8;
	
		}
	}
	else
	{
		zixing_code[1]  = pbuff[i+1];
		i++;
		if(x>(479-15))
		{
			x = 0;
			y+=16;
		}
		if(y>271-15)
		{
			y = 0;
			x =0;
			page = i-1;
			break;
		}	
		Glib_disp_hzk16_v(x,y,zixing_code,color);
		x+=16;
	}
}
 
}
void main(void)
 { 
 Set_PLL(16,4);
 Init_EBIU();
 Init_SDRAM();
LCDBK_Disable();
SD_Enable();
f_mountdrv();
scan_files("/txt",file_name,file_count,dir_name,dir_count);
retval = f_open(&infile,"/txt/test.txt", FA_OPEN_ALWAYS | FA_READ);
if (retval != 0){
	printf("can't open file\n");
	exit(-1);
}	
f_read(&infile, buffer, 0x200000, &lenth);
f_close(&infile);
Glib_disp_hzk16_v(100,136,"开始阅读电子书,按按键翻页查看",0xffffff);
RGB888_RGB565(DisplayBuffer,391680,DisplayBuffer_565);
InitDMA();
InitPPI();
InitTimer();
PPI_TMR_DMA_Enable();
LCD_Enable();
Init_Timers0(1999);//1~1999 控制背光亮度
Enable_Timers0();
LCDBK_Enable();	
delay(100000);
while(1)
{
	keydata = *pKEY_DAT;	//读键值
    switch(keydata)
    {
		case 0xfe: 	
			delay(1000);
			while((*pKEY_DAT&0xff)!=0xff);
			if(keydata == 0xfe)
			{
				if(count==0)
					break;	
				count --;
				read_addr = old_addr[count];
				lenth += page;
				display_txt(&buffer[read_addr],lenth,0xffffff);
				RGB888_RGB565(DisplayBuffer,391680,DisplayBuffer_565);
			}
		break;
		
		case 0xfb:
			delay(1000);
			while((*pKEY_DAT&0xff)!=0xff);
			
				if(lenth<page)
					break;
				old_addr[count] = read_addr;
				count++;
				read_addr += page;
				lenth -= page;
				memset(DisplayBuffer,'\0',391680);
				display_txt(&buffer[read_addr],lenth,0xffffff);
				RGB888_RGB565(DisplayBuffer,391680,DisplayBuffer_565);
		break;		
		default:	break;
    }	
}
 
}



















