原创 24c01~24c1024全系列EEPROM的读写程序

sbit SDA =P1^1;
sbit SCL =P1^4;
sbit WP =P1^7;
sbit  light =P1^0;
sbit  power =P1^6;

#define   uchar   unsigned char
#define   uint    unsigned int

void iic_delay10ms();
void iic_delay(void);
void iic_start(void);
void iic_stop(void);
void iic_ack(void);
void read_byte(void);
void send_byte(void);
void initial(void);
void ok(void);
void error(void);
void read_eeprom(void);
void write_eeprom(void);
void init(void);

uchar  ack_flag,send_data,receive_data[32]; 
uchar  rw,type,device_addr,addr[3],num;

void main(void)
{ 
 initial();
 power =0;
 light =0;

 while(1)
 { 
  ES =1;
  rw =0x55;
   WP =0;
  while(rw ==0x55);
  ES =0;
  switch(type)
   {
    case 0x01:
    case 0x02:
    case 0x04:
    case 0x08:
    case 0x16: 
     type =0x02;
     addr[1] |=0xa0;
     device_addr <<=1;
     addr[1] |=device_addr;
     break;
    default:
     type =0x03;
     addr[2] |=0xa0;
     device_addr <<=1;
     addr[2] |=device_addr;     
   } 
  if(rw ==0x01)  //读EEPROM
  {
   read_eeprom();
  }
  else if(rw ==0x00) //写EEPROM
  {
   write_eeprom();
  }
  else        //error command
  {   
   error(); 
   ACC =0x01;
   SBUF =ACC;
   while(!TI);
   TI =0;  
  }   
 }
}

void read_eeprom(void)
{
 uchar i;
 WP =1;
 iic_start();
 for(i=1;i<=type;i++)
  {
   send_data =addr[type-i];
   send_byte();
   iic_ack();
   if(ack_flag ==0x01)
    break;
  }
 if(ack_flag ==0x00)
  { 
   iic_start();
   addr[type-1] |=0x01;
   send_data =addr[type-1];
   send_byte();
   iic_ack();
   if(ack_flag ==0x00)
   {    
    for(i=0;i<num;i++)
     {
      read_byte();
      SBUF =send_data;
      while(!TI);
      TI =0;
      SDA =0;
      SCL =1;
      iic_delay();
      SCL =0;
     }
    iic_stop();
    rw =0x55;
   }
   else
   {
    error();
    ACC =0x03;
    SBUF =ACC;
    while(!TI);
    TI =0;
   }
  }
 else
  {  
   error(); 
   ACC =0x02;
   SBUF =ACC;
   while(!TI);
   TI =0; 
  }
}

void write_eeprom(void)
{
 uchar i; 
 WP =0;
 iic_start();
 for(i=1;i<=type;i++)
  {
   send_data =addr[type-i];
   send_byte();
   iic_ack();
   if(ack_flag ==0x01)
    break;
  }
 if(ack_flag ==0x00)
 {
  for(i=0;i<num;i++)
  {
  send_data =receive_data;
  send_byte();
  iic_ack();
  iic_delay10ms();  
  }
   iic_stop();
   rw =0x55;
 }
 else
 {
  error();
  ACC =0x04;
  SBUF =ACC;
  while(!TI);
  TI =0;
 }
}