super_wave.lst

超声波经典经典应用

C51 COMPILER V9.00   SUPER_WAVE                                                            09/21/2012 19:52:01 PAGE 1   


C51 COMPILER V9.00, COMPILATION OF MODULE SUPER_WAVE
OBJECT MODULE PLACED IN super_wave.OBJ
COMPILER INVOKED BY: E:\learingsoft\mcu\keil4\C51\BIN\C51.EXE super_wave.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include<reg52.h>
   2          #define uchar unsigned char
   3          #define uint unsigned int
   4          sbit trig = P2^1;
   5          sbit echo = P3^2;
   6          bit flag = 0;
   7          uint wave_time;
   8          void delay_20us(){
   9   1      
  10   1              uchar a ;
  11   1              for(a = 0;a < 200;a++);
  12   1      }
  13          
  14          void delay(uint ms){
  15   1              
  16   1              uchar a;
  17   1              for(;ms > 0;ms--){              
  18   2                      for(a = 0;a < 110;a++)
  19   2                      ;       
  20   2              }
  21   1      }
  22          int main(void){
  23   1      
  24   1              uint distance = 0;
  25   1              P1 = 0xfd;
  26   1         TMOD = 0x01;
  27   1         TH0 = 0;
  28   1         TL0 = 0;
  29   1         trig = 0;
  30   1      
  31   1         while(1){
  32   2         
  33   2      
  34   2                EA = 0;
  35   2                trig = 1;
  36   2                delay_20us();
  37   2                trig = 0;
  38   2      
  39   2                while(echo == 0);
  40   2      
  41   2                TR0 = 1;
  42   2                EX0 = 1;
  43   2                IT0 = 0;
  44   2                EA = 1;
  45   2                delay(20);
  46   2      
  47   2                if(flag == 1){
  48   3                
  49   3                      flag = 0;
  50   3                      distance = wave_time/58;
  51   3                      if(distance < 20)
  52   3                              P1 = 0x55;
  53   3                      else
  54   3                              P1 = 0xaa;
  55   3                }  
C51 COMPILER V9.00   SUPER_WAVE                                                            09/21/2012 19:52:01 PAGE 2   

  56   2         }
  57   1      
  58   1      
  59   1      }
  60          
  61          void inter() interrupt 0{
  62   1      
  63   1              TR0 = 0;
  64   1              EX0 = 0;
  65   1              wave_time = TH0*256 + TL0;
  66   1              TH0 = 0;
  67   1              TL0 = 0;
  68   1              flag = 1;
  69   1      
  70   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    167    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      2    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      1    ----
END OF MODULE INFORMATION.


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