max490.lst

51单片机示例程序

C51 COMPILER V7.20   MAX490                                                                12/07/2007 15:43:26 PAGE 1   


C51 COMPILER V7.20, COMPILATION OF MODULE MAX490
OBJECT MODULE PLACED IN MAX490.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE MAX490.C BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*******************************************************
   2          
   3                         RS485通信实验
   4                    网址:http://www.kaifaban.com
   5          
   6             功能:通过MAX490发送数据0x11,再用MAX490接收回来并在P0口显示
   7               注:A连接Y,B连接Z,J12连接左边两端
   8          
   9          *******************************************************/
  10          #include <reg52.h>
  11          #include <intrins.h>
  12          #define  uint unsigned int
  13          #define  uchar unsigned char
  14          sbit DsySelect=P3^7;//控制LED的74HC244所在IO口
  15          void Delay(uint count){
  16   1      uint i;
  17   1      for(i=0;i<count;i++);
  18   1      }//串行中断程序
  19          void UART() interrupt 4
  20          {
  21   1        if(TI)
  22   1        {
  23   2        if(SBUF==0x11)
  24   2              {
  25   3              SBUF==0;
*** WARNING C275 IN LINE 25 OF MAX490.C: expression with possibly no effect
  26   3              P0=~SBUF;Delay(5000);
  27   3      
  28   3              P0=SBUF;Delay(5000);
  29   3              SBUF=0x10;
  30   3              }
  31   2        TI=0;
  32   2        }
  33   1      else
  34   1       if(RI)
  35   1       {
  36   2              if(SBUF==0x10)
  37   2              {
  38   3                      SBUF==0;
*** WARNING C275 IN LINE 38 OF MAX490.C: expression with possibly no effect
  39   3                      P0=~SBUF;Delay(5000);
  40   3      
  41   3                      P0=SBUF;Delay(5000);
  42   3                      SBUF=0x11;
  43   3              }
  44   2        
  45   2              RI=0;
  46   2       }
  47   1      }
  48          //延时函数
  49          
  50          //主程序
  51          main(){
  52   1      DsySelect=0;//打开LED
  53   1      EA=1;//开总中断
C51 COMPILER V7.20   MAX490                                                                12/07/2007 15:43:26 PAGE 2   

  54   1      ES=1;//开串行中断
  55   1      SCON=0x50;//串口模式1
  56   1      PCON=0; //波特率不翻倍
  57   1      TMOD=0x20; //定时器1工作方式2
  58   1      TL1=TH1=0xFD; //波特率9600bps(11.0592M)
  59   1      TR1=1; //启动定时器1
  60   1      while(1){
  61   2      SBUF=0x11;//发送数据
  62   2      while(!TI);//等待发送完成
  63   2      TI=0;//清除发送标志
  64   2      while(!RI);
  65   2      RI=0;
  66   2      Delay(30000);
  67   2      }
  68   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    140    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  2 WARNING(S),  0 ERROR(S)