jianpan.lst

键盘扫描的一种方法经过调试可以运行!键盘扫描的一种方法经过调试可以运行

C51 COMPILER V8.08   JIANPAN                                                               04/28/2008 21:27:05 PAGE 1   


C51 COMPILER V8.08, COMPILATION OF MODULE JIANPAN
OBJECT MODULE PLACED IN jianpan.OBJ
COMPILER INVOKED BY: D:\keil\C51\BIN\C51.EXE jianpan.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include <reg51.h>
   2          #define uchar unsigned char
   3          #define uint  unsigned int
   4           
   5          void delay (void);
   6          uchar keyscan(void);
   7          
   8          void main(void)
   9          {  uchar key ;
  10   1         
  11   1         P2=0x00;
  12   1       /* while(1)
  13   1        { 
  14   1          key=keyscan();
  15   1          delay();
  16   1          P2=key;
  17   1        }*/
  18   1      }
*** WARNING C280 IN LINE 9 OF JIANPAN.C: 'key': unreferenced local variable
  19          
  20          void delay (void)
  21          { uint i;
  22   1        for(i=0;i<=200;i++)
  23   1        {}
  24   1      }
  25          
  26          uchar keyscan(void)
  27          {  uchar sccode;     //行
  28   1         uchar recode;     //列 
  29   1         P1=0xf0;
  30   1         if((P1&0xf0)!=0xf0)
  31   1         { delay();
  32   2           if((P1&0xf0)!=0xf0)
  33   2           { sccode=0xfe;        
  34   3            while((sccode&0x10)!=0)
  35   3            { P1=sccode;
  36   4              if((P1&0xf0)!=0xf0)
  37   4              {recode=(P1&0xf0)|0x0f;
  38   5              return((~sccode)+(~recode));
  39   5              }
  40   4              else
  41   4              {sccode=(sccode<<1)|0x01;}
  42   4            }
  43   3      
  44   3           }
  45   2           else
  46   2           return(0);
  47   2         }
  48   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     81    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
C51 COMPILER V8.08   JIANPAN                                                               04/28/2008 21:27:05 PAGE 2   

   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       1
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  1 WARNING(S),  0 ERROR(S)