24c02.c

来自「AT24C02EEPROM C语言子程序」· C语言 代码 · 共 125 行

//24c02读写程序(已通过测试)
#define  NUM  10 	                    //	接收和发送缓存区的深度	                 
uchar idata wdata[NUM];       // 数据发送缓冲区
uchar idata rdata[NUM];    // 数据接收缓冲区

// 脚定义
sbit SCL=P2^4;  //24c02 SCL
sbit SDA=P2^5;  //24c02 SDA

// 功能函数
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<255))i++;
SCL=0;
}

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

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