24C02讀寫操作程序.c

#define uchar unsigned char
#define uint unsigned int
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sbit scl=P3^5;? //24c02 SCL
sbit sda=P3^4;? //24c02 SDA
sbit DOG=P1^7;? //狗
uchar x24c02_read(uchar address);? //從24c02的地址address中讀取一個字節(jié)數據
void x24c02_write(uchar address,uchar info);? //向24c02的address地址中寫入一字節(jié)數據info
void x24c02_init();?? //24c02初始化子程序
void delay1(uchar x);
void flash();
void x24c01_init();
void start();
void stop();
void writex(uchar j);
uchar readx();
void clock();
void delay1(uchar x)
{
?? uint i;
?? for(i=0;i?? DOG=~DOG;
}
void flash()
{
?? uchar u;
?? DOG=~DOG;
}
void x24c02_init()
{
?? scl=1; flash(); sda=1; flash();
}
void start()
{
?? sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
}
void stop()
{
?? sda=0; flash(); scl=1; flash(); sda=1; flash();
}
void writex(uchar j)
{
?? uchar i,temp;
?? temp=j;
?? for (i=0;i<8;i++){
????? temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; flash();
?? }
?? scl=0; flash(); sda=1; flash();
}
uchar readx()
{
?? uchar i,j,k=0;
?? scl=0; flash(); sda=1;
?? for (i=0;i<8;i++){
????? flash(); scl=1; flash();
????? if (sda==1) j=1;
????? else j=0;
????? k=(k<<1)|j; scl=0;
?? }
?? flash(); return(k);
}
void clock()
{
?? uchar i=0;
?? scl=1; flash();
?? while ((sda==1)&&(i<255))i++;
?? scl=0; flash();
}
uchar x24c02_read(uchar address)
{
?? uchar i;
?? start(); writex(0xa0);
?? clock(); writex(address);
?? clock(); start();
?? writex(0xa1); clock();
?? i=readx(); stop();
?? delay1(10);
?? return(i);
}
void x24c02_write(uchar address,uchar info)
{
?? EA=0;
?? start(); writex(0xa0);
?? clock(); writex(address);
?? clock(); writex(info);
?? clock(); stop();
?? EA=1;
?? delay1(50);
}

24C02 pdf datasheet