24c02.c

来自「89s51单片机做的计数器」· C语言 代码 · 共 117 行

#include "24c02.h"

void x24c02_delay(char x)
{
int i;
for(i=0;i<x;i++);
}

void x24c02_start()
{
SDA = 1; 
SCL = 1; 
SDA = 0; 
SCL = 0; 
}

void x24c02_stop()
{
SDA=0;
SCL=1;
SDA=1;
}
void x24c02_writex(char j)
{
char i,temp;
temp=j;
for (i=0;i<8;i++)
{
  temp=temp<<1; 
  SCL=0; 
  SDA=CY; 
  SCL=1; 
}
SCL=0;
SDA=1;
}
char x24c02_readx()
{
char i,j,k=0;
SCL=0;
SDA=1;
for (i=0;i<8;i++)
{
  SCL=1;
  if (SDA==1) j=1;
  else j=0;
  k=(k<<1)|j;
  SCL=0;
}
return(k);
}
void x24c02_clock()
{
char i=0;
SCL=1;
while ((SDA==1)&&(i<155))i++;//while ((SDA==1)&&(i<255))i++;  155
SCL=0;
}

void x24c02_init()
{
SCL = 1;
SDA = 1;
}

char x24c02_read(unsigned int address)
{
char i;
x24c02_start();
x24c02_writex(0xa0);
x24c02_clock();
x24c02_writex(address);
x24c02_clock(); 
x24c02_start();
x24c02_writex(0xa1); 
x24c02_clock();
i=x24c02_readx(); 
x24c02_stop();
x24c02_delay(10);
return(i);
}

void x24c02_write(unsigned int address, char info)
{
EA=0;
x24c02_start();
x24c02_writex(0xa0);
x24c02_clock();
x24c02_writex(address);
x24c02_clock();
x24c02_writex(info);
x24c02_clock();
x24c02_stop();
EA=1;
//x24c02_delay(10);//x24c02_delay(50);
}

/*void x24c02_writestr(char address, unsigned char *wdata, unsigned char wlen)
{
unsigned char k=0;
do 
{
  x24c02_write(address+k, *(wdata + k));
  k++;
} while(k < wlen);
}  */

/*void x24c02_readstr(unsigned int address, unsigned char *rdata, unsigned char rlen)
{
unsigned char k=0;
do 
{
  rdata[k] = x24c02_read(address+k);
  k++;
} while(k < rlen);
}   */