lesson8.lst

IIC 测试程序经过测试绝对可用

C51 COMPILER V6.12  LESSON8                                                                01/31/2007 10:56:07 PAGE 1   


C51 COMPILER V6.12, COMPILATION OF MODULE LESSON8
OBJECT MODULE PLACED IN .\lesson8.OBJ
COMPILER INVOKED BY: D:\Program Files\Keil\C51\BIN\C51.EXE .\lesson8.c DEBUG OBJECTEXTEND

stmt level    source

   1          #include<reg52.h>
   2          #define uchar unsigned char
   3          sbit sda=P2^0;
   4          sbit scl=P2^1;
   5          uchar a;
   6          void delay()
   7          { ;; }
   8          void start()  //开始信号
   9          {	
  10   1      	sda=1;
  11   1      	delay();
  12   1      	scl=1;
  13   1      	delay();
  14   1      	sda=0;
  15   1      	delay();
  16   1      }
  17          
  18          void stop()   //停止
  19          {
  20   1      	sda=0;
  21   1      	delay();
  22   1      	scl=1;
  23   1      	delay();
  24   1      	sda=1;
  25   1      	delay();
  26   1      }
  27          
  28          void respons()  //应答
  29          {
  30   1      	uchar i;
  31   1      	scl=1;
  32   1      	delay();
  33   1      	while((sda==1)&&(i<250))i++;
  34   1      	scl=0;
  35   1      	delay();
  36   1      }
  37          
  38          void init()
  39          {
  40   1      	sda=1;
  41   1      	delay();
  42   1      	scl=1;
  43   1      	delay();
  44   1      }
  45          
  46          void write_byte(uchar date)
  47          {
  48   1      	uchar i,temp;
  49   1      	temp=date;
  50   1      
  51   1      
  52   1      	for(i=0;i<8;i++)
  53   1      	{
  54   2      		temp=temp<<1;
  55   2      		scl=0;
C51 COMPILER V6.12  LESSON8                                                                01/31/2007 10:56:07 PAGE 2   

  56   2      	    delay();
  57   2      		sda=CY;
  58   2      		delay();
  59   2      		scl=1;
  60   2      		delay();
  61   2      	//	scl=0;
  62   2           //   delay();
  63   2      	}
  64   1      	scl=0;
  65   1      	delay();
  66   1      	sda=1;
  67   1      	delay();
  68   1      }
  69          
  70          uchar read_byte()
  71          {
  72   1      	uchar i,k;
  73   1      	scl=0;
  74   1      	delay();
  75   1      	sda=1;
  76   1      	delay();
  77   1      	for(i=0;i<8;i++)
  78   1      	{
  79   2      		scl=1;
  80   2      		delay();
  81   2      	/*	if(sda==1)
  82   2      			j=1;
  83   2      		else
  84   2      			j=0;*/
  85   2      		
  86   2      		k=(k<<1)|sda;
  87   2      		scl=0;
  88   2      		delay();	
  89   2      	}
  90   1      	return k;
  91   1      }
  92          
  93          void delay1(uchar x)
  94          {
  95   1      	uchar a,b;
  96   1      	for(a=x;a>0;a--)
  97   1      	 for(b=100;b>0;b--);
  98   1      }
  99          
 100          void write_add(uchar address,uchar date)
 101          {
 102   1      	start();
 103   1      	write_byte(0xa0);
 104   1      	respons();
 105   1      	write_byte(address);
 106   1      	respons();
 107   1      	write_byte(date);
 108   1      	respons();
 109   1      	stop();
 110   1      }
 111          
 112          uchar read_add(uchar address)
 113          {
 114   1      	uchar date;
 115   1      	start();
 116   1      	write_byte(0xa0);
 117   1      	respons();
C51 COMPILER V6.12  LESSON8                                                                01/31/2007 10:56:07 PAGE 3   

 118   1      	write_byte(address);
 119   1      	respons();
 120   1      	start();
 121   1      	write_byte(0xa1);
 122   1      	respons();
 123   1      	date=read_byte();
 124   1      	stop();
 125   1      	return date;
 126   1      }
 127          
 128          void main()
 129          {
 130   1      	init();
 131   1      	write_add(23,0xaa);
 132   1      	delay1(100);
 133   1      	P1=read_add(23);
 134   1      	while(1);
 135   1      }
 136          
 137          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    221    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      1       1
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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