24lcxx.c

实现读写24LC65的程序经试用有够有效

#include<reg51.h>
#include<math.h>
#define uint unsigned int
#define uchar unsigned char
/*****************24LC65******************************/
sbit SISO2465=P0^1;
sbit CLOCK2465=P0^0;
/*************24lc65读写程序*********************/
void dlms5000(uint i)    //382=5ms; 75=1ms
{ uint  i1;
  for(i1=0;i1<i;i1++){}
}
void dlms(void)
{ uchar i1;
  for(i1=1;i1<200;i1++){}
}
/***************************************
NAME:INITIALIZING 24LC65
AIM: STARTING AND STOPPING 24LC65
****************************************/
void st24LC65(void)
{
  SISO2465=1;
  CLOCK2465=1;
  dlms();
  SISO2465=0;
  CLOCK2465=0;
}
void stop24LC65(void)
{
  CLOCK2465=0;
  SISO2465=0;
  dlms();
  CLOCK2465=1;
  SISO2465=1;
 }
/***************************************
NAME:WRITING 24LC65
AIM :WRITING PARAMETERS THAT NEED SAVE
     FOREVER.
****************************************/
void wshuju(uchar a)
{
  uchar i;uint  b,f;
  f=0;
  b=a;
  for(i=0;i<8;i++)
     {
       b=b*2;
       f=b&0x0100;
       f=f/0x0100;
       CLOCK2465=0;
       SISO2465=f;
       dlms();
       dlms();
       CLOCK2465=1;
      }
  CLOCK2465=0;
  dlms();
  CLOCK2465=1;
  CLOCK2465=0;
}
uchar rshuju()
{
  uint  a, e;uchar  i;
  a=0; e=0;
  for(i=0;i<8;i++)
      {
      CLOCK2465 =1;
      e=SISO2465;
      CLOCK2465=0;
      a=(a<<1)+e;
      e=0;
      }
   dlms();
   CLOCK2465 =1;
   CLOCK2465=0;
   i=(uchar)a;
   return(i);
}
void w24lc65sj(uint addr,uchar a,uchar chipselect)    //chipselect=0xa0;
{ uchar  idata taddl,taddh;
  taddl=addr%256;
  taddh=addr>>8;
  st24LC65();
  wshuju(chipselect);
  wshuju(taddh);
  wshuju(taddl);
  wshuju(a);
  stop24LC65();
  dlms5000(600);
}
uchar r24lc65sj(uint addr,uchar chipselect)
{ uchar a;
  uchar idata taddl,taddh;
    EA=1;
    taddl=addr%256;
    taddh=addr>>8;
    st24LC65();
    wshuju(chipselect);
    wshuju(taddh);
    wshuju(taddl);
    stop24LC65();
    st24LC65();
    wshuju(chipselect+1);
    a=rshuju();
    stop24LC65();
    EA=1;
    return(a);
}main()
{char i,j;
 w24lc65sj(0x00,0x55,0xa0);
 i=r24lc65sj(0x00,0xa0);
 j=0;
}