C51 COMPILER V9.59.0.0   ULTRASONIC                                                        03/12/2024 11:41:20 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; // 38
  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          CH = CL = 0; // 清空PCA寄存器计数值
  36   1          CCON = 0;    // 初始化PCA控制寄存器/PCA定时器停止/清除CF/
  37   1      
  38   1          EA = 0;           // 关闭总中断
  39   1          Ut_Wave_Init();   // 发送超声波驱动信号
  40   1          EA = 1;           // 开启总中断
  41   1          CR = 1;           // PCA开始计数
  42   1          while (Rx && !CF) // TF1
  43   1              ;             // 等待接收
  44   1          CR = 0;           // PCA停止计数
  45   1          if (CF == 0)
  46   1          {
  47   2              time = CH << 8 | CL; // 单位为毫秒
  48   2              // L=V*T/2
  49   2              return (time * 0.017); // 返回的单位是cm
  50   2          }
  51   1          else
  52   1          {
  53   2              CF = 0;
  54   2              return 0;
C51 COMPILER V9.59.0.0   ULTRASONIC                                                        03/12/2024 11:41:20 PAGE 2   

  55   2          }
  56   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     93    ----
   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)