fat32readfile.lst

用C51单片机实现的MP3播放器的c代码程序。

C51 COMPILER V6.12  FAT32READFILE                                                          05/03/2005 11:17:15 PAGE 1   


C51 COMPILER V6.12, COMPILATION OF MODULE FAT32READFILE
OBJECT MODULE PLACED IN .\FAT32READFILE.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE .\FAT32READFILE.C LARGE BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #ifndef _FAT32_DEFINE
   2           #include "FAT32.c"
   3          #endif
   4          
   5          WORD FAT32ReadFile(BYTE fp);
   6          
   7          WORD FAT32ReadFile(BYTE fp)
   8          {
   9   1      	register WORD tmp;
  10   1      
  11   1      	if (FCB[fp].ByteCnt==FCB[fp].Size) return(0);
  12   1      	else
  13   1      	{
  14   2      		FCB[fp].ByteCnt+=IDE.BytesPerSec;
  15   2      		if (FCB[fp].ByteCnt<=FCB[fp].Size) tmp=IDE.BytesPerSec;
  16   2      		else
  17   2      		{
  18   3      			FCB[fp].ByteCnt-=IDE.BytesPerSec;
  19   3      			tmp=FCB[fp].Size-FCB[fp].ByteCnt;
  20   3      			FCB[fp].ByteCnt=FCB[fp].Size;
  21   3      		}
  22   2      
  23   2      		if (FCB[fp].ClusSecCnt==FAT32.SecPerClus)			//读下一簇
  24   2      		{
  25   3      			FCB[fp].LastCluster=FAT32NextCluster(FCB[fp].LastCluster);
  26   3      			if (FCB[fp].LastCluster==0x0fffffff) return(0);
  27   3      			IDEReadSector(ClusterToSector(FCB[fp].LastCluster));
  28   3      			FCB[fp].ClusSecCnt=1;
  29   3      		}
  30   2      		else if (FCB[fp].ClusSecCnt==0)					//读第一簇
  31   2      		{
  32   3      			IDEReadSector(ClusterToSector(FCB[fp].LastCluster));
  33   3      			FCB[fp].ClusSecCnt++;
  34   3      		}
  35   2      		else										//读当前簇下一扇区
  36   2      		{
  37   3      			IDEReadSector(ClusterToSector(FCB[fp].LastCluster)+FCB[fp].ClusSecCnt);
  38   3      			FCB[fp].ClusSecCnt++;
  39   3      		}
  40   2      	}
  41   1      	return(tmp);
  42   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =   1028    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----       3
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)