1 #include<reg51.h>
  2
  3 #define uchar unsigned char
  4 #define uint unsigned int
  5
  6 sbit SDA=P2^0;
  7 sbit SCL=P2^1;
  8
  9 //uchar code Table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
 10 //                    0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F   无显示
 11
 12 void Delay1ms();
 13 void delay1(int n);
 14 void delay();
 15 void start();
 16 void stop();
 17 void responds();
 18 void init();
 19 void write_byte(uchar date);
 20 uchar read_byte();
 21
 22 void main()
 23 {
 24     init();
 25     start();
 26     write_byte(0xa0);
 27     responds();
 28     write_byte(0);
 29     responds();
 30     write_byte(0xfe);
 31     responds();
 32     stop();
 33
 34     delay1(1000);//这里要有延时，停止后不能直接启动
 35
 36     start();
 37     write_byte(0xa0);
 38     responds();
 39     write_byte(0);
 40     responds();
 41     start();
 42     write_byte(0xa1);
 43     responds();
 44     P1=read_byte();
 45     stop();
 46     while(1);
 47 }
 48 void write_byte(uchar date)
 49 {
 50     //写一个字节
 51     uchar i=0,temp;
 52     temp=date;
 53     SCL=0;
 54     delay();
 55     for(i=0;i<8;i++)
 56     {
 57         temp=temp<<1;
 58         SDA=CY;
 59         delay();
 60         SCL=1;
 61         delay();
 62         SCL=0;
 63         delay();
 64     }
 65     SDA=1;
 66     delay();
 67 }
 68 uchar read_byte()
 69 {
 70     //读一个字节
 71     uchar i,j,k;
 72     SCL=0;
 73     delay();
 74     SDA=1;
 75     delay();
 76     for(i=0;i<8;i++)
 77     {
 78         SCL=1;
 79         delay();
 80         j=SDA;
 81         k=(k<<1)|j;
 82         SCL=0;
 83         delay();
 84     }
 85     return k;
 86 }
 87 void init()
 88 {
 89     SDA=1;
 90     SCL=1;
 91 }
 92 void start()
 93 {
 94     //起始信号
 95     SDA=1;
 96     delay();
 97     SCL=1;
 98     delay();
 99     SDA=0;
100     delay();
101
102 }
103 void stop()
104 {
105     //停止信号
106     SDA=0;
107     delay();
108     SCL=1;
109     delay();
110     SDA=1;
111     delay();
112 }
113 void responds()
114 {
115     //应答信号
116     uchar i=0;
117     SCL=1;
118     delay();
119     while((SDA==1)&&(i<250))
120     {
121         i++;
122     }
123     SCL=0;
124     delay();
125 }
126 void delay()
127 {
128
129 }
130 void delay1(int n)
131 {
132     while(n--)
133     {
134         Delay1ms();
135     }
136 }
137 void Delay1ms()        //@12.000MHz
138 {
139     unsigned char i, j;
140
141     i = 2;
142     j = 239;
143     do
144     {
145         while (--j);
146     } while (--i);
147 }