u1.lst

这是串口通信的下位机测试程序

C51 COMPILER V6.12  U1                                                                     12/18/2007 07:51:28 PAGE 1   


C51 COMPILER V6.12, COMPILATION OF MODULE U1
OBJECT MODULE PLACED IN .\u1.OBJ
COMPILER INVOKED BY: E:\单片机软件资料\c51\C51\BIN\C51.EXE .\u1.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include <reg51.h>
   2          
   3          void init_com();
   4          
   5          void changeinto();
   6          bit  read_flag=0;
   7          unsigned char astring;
   8          static unsigned char xianshichar;
   9          
  10          void main()
  11          {
  12   1      	init_com();
  13   1      
  14   1      	EA=1; ES=1;       //开中断，允许串行口中断
  15   1      	REN=1;            //允许串口中断            
  16   1           
  17   1          P0=0;
  18   1         
  19   1          while(1)
  20   1          {
  21   2                if(read_flag)  //如果取数标志已置位，就将读到的字符串从串口发出 
  22   2                {   changeinto();
  23   3                     read_flag=0; //取数标志清0  
  24   3      			   P0=xianshichar;
  25   3      			   
  26   3                }
  27   2          }
  28   1      }
  29          
  30          void init_com( void )
  31          {
  32   1          TMOD=0x20;         /*晶振11.0592，波特率2400，方式3*/
  33   1          TL1=0x0f3;
  34   1          TH1=0x0f3;
  35   1          SCON=0xd8;        /*串口接受字符RI置位，允许串口接收*/
  36   1          PCON=0x00;
  37   1          TR1=1;
  38   1      }
  39          
  40          
  41          //串口接收中断
  42          void serial () interrupt 4 using 3 
  43          {
  44   1          unsigned char ch;
  45   1      	ch=SBUF;
  46   1          if(RI)                         //确实有接收中断了
  47   1          {
  48   2      	    RI = 0;
  49   2              astring=ch;
  50   2      		
  51   2      		read_flag=1;
  52   2      	
  53   2          }
  54   1      }
  55          void changeinto()
C51 COMPILER V6.12  U1                                                                     12/18/2007 07:51:28 PAGE 2   

  56          {
  57   1        switch(astring)
  58   1          { 	case 0x0: xianshichar=0x7e;break;
  59   2      		case 0x1: xianshichar=0x48;break;
  60   2      		case 0x2: xianshichar=0x3d;break;
  61   2      		case 0x3:	xianshichar=0x6d;break;
  62   2      		case 0x4:	xianshichar=0x4b;break;
  63   2      		case 0x5:	xianshichar=0x67;break;
  64   2      		case 0x6:	xianshichar=0x77;break;
  65   2      		case 0x7:	xianshichar=0x4e;break;
  66   2      		case 0x8:	xianshichar=0x7f;break;
  67   2      		case 0x9:	xianshichar=0x6f;break;
  68   2             default: break;
  69   2            
  70   2      	}
  71   1      }
  72          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    146    ----
   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)