C51 COMPILER V9.59.0.0   ULTRASONIC                                                        02/24/2024 21:37:53 PAGE 1   


C51 COMPILER V9.59.0.0, COMPILATION OF MODULE ULTRASONIC
OBJECT MODULE PLACED IN .\Objects\Ultrasonic.obj
COMPILER INVOKED BY: D:\Keil_v5\C51\BIN\C51.EXE ..\Driver\Ultrasonic.c OPTIMIZE(8,SPEED) BROWSE INCDIR(..\Driver) DEBUG 
                    -OBJECTEXTEND PRINT(.\Listings\Ultrasonic.lst) TABS(2) OBJECT(.\Objects\Ultrasonic.obj)

line level    source

   1          #include "Ultrasonic.h"
   2          #include "intrins.h"
   3          
   4          sbit Tx = P1 ^ 0;
   5          sbit Rx = P1 ^ 1;
   6          void Delay12us(void) //@12.000MHz
   7          {
   8   1          unsigned char data i;
   9   1      
  10   1          _nop_();
  11   1          _nop_();
  12   1          i = 33;
  13   1          while (--i)
  14   1              ;
  15   1      }
  16          
  17          void Ut_Wave_Init()
  18          {
  19   1          unsigned char i;
  20   1          // 发送8个40kHz的方波
  21   1          // f=40kHz->T=1/f=0.000025s=25us
  22   1          // 12.5us 1 12.5us 0
  23   1          for (i = 0; i < 8; i++)
  24   1          {
  25   2              Tx = 1;
  26   2              Delay12us();
  27   2              Tx = 0;
  28   2              Delay12us();
  29   2          }
  30   1      }
  31          
  32          unsigned char Ut_Wave_Data()
  33          {
  34   1          unsigned int time;
  35   1          TMOD &= 0x0f;
  36   1          TH1 = TL1 = 0;
  37   1          Ut_Wave_Init();
  38   1          TR1 = 1;
  39   1          while ((Rx == 1) && (TF1 == 0))
  40   1              ; // 数据读取未结束，并且没有溢出
  41   1          TR1 = 0;
  42   1          // 没有溢出，数据读取结束
  43   1          if (TF1 == 0)
  44   1          {
  45   2              time = TH1 << 8 | TL1; // 单位为毫秒
  46   2              // L=V*T/2
  47   2              return (time * 0.017); // 返回的单位是cm
  48   2          }
  49   1          // 数据溢出，认定此次测量无效
  50   1          else
  51   1          {
  52   2              TF1 = 0;
  53   2              return 0;
  54   2          }
C51 COMPILER V9.59.0.0   ULTRASONIC                                                        02/24/2024 21:37:53 PAGE 2   

  55   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     90    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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