eeprom.c

以C8051F040为平台,利用其自带的IIC控制器,对EEPROM芯片AT24c256进行读写的底层操作源代码

#include "LZK.H"

void WriteROM(uint8 Page,uint8 Data[])
{
      uint8 Counter;



      SFRPAGE = 0x00;
	  while( BUSY );
	  STA = 1;//发送启动信号

      while( SMB0STA != 0x08 );//起始位发送成功
	  STA = 0;//停止发送启动位
	  SMB0DAT = 0xA0;//装载从机写地址
	  SI = 0;//发送装载数据

	  while( SMB0STA != 0x18 );//收到EEPROM应答
	  SMB0DAT = Page;//装载数据地址（页）
	  SI = 0;//发送装载数据

	  while( SMB0STA != 0x28 );//收到EEPROM应答
	  SMB0DAT = 0;//装载数据地址（格）
	  SI = 0;//发送装载数据

      /*发送每页64格数据*/
      for(Counter=0; Counter<64; Counter++)
      {
	      while( SMB0STA != 0x28 );
		  SMB0DAT = Data[Counter];
		  SI = 0;
      }

	  while( SMB0STA != 0x28 );//收到EEPROM应答
	  STO = 1;//装载停止位
	  SI = 0;//发送停止位
}

void ReadROM(uint8 Page, uint8 Data[])
{
      uint8 Counter;



      SFRPAGE = 0x00;
	  while( BUSY );
	  STA = 1;//发送启动信号

	  while( SMB0STA != 0x08 );//起始位发送成功
	  STA = 0;//停止发送启动位
	  SMB0DAT = 0xA0;//装载从机写地址
	  SI = 0;//发送装载数据

	  while( SMB0STA != 0x18 );//收到EEPROM应答
	  SMB0DAT = Page;//装载数据地址（页）
	  SI = 0;//发送装载数据

	  while( SMB0STA != 0x28 );//收到EEPROM应答
	  SMB0DAT = 0;//装载数据地址（格）
	  SI = 0;//发送装载数据
	  SI = 0;//发送装载数据





	  while( SMB0STA != 0x28 );//收到EEPROM应答
	  STA = 1;//发送启动信号
	  SI = 0;

	  while( SMB0STA != 0x10 );//重复起始位发送成功
	  STA = 0;//停止发送启动位
	  SMB0DAT = 0xA1;//装载从机读地址
	  SI = 0;//发送装载数据
	  
	  while( SMB0STA != 0x40 );//收到EEPROM应答
	  AA = 1;//准备应答,此时SMB0DAT中的数据无意义,不接收
	  SI = 0;




	  for(Counter = 0;Counter<64;Counter++)
	  {
	      while( SMB0STA != 0x50 );
		  Data[Counter] = SMB0DAT;
		  if(Counter == 63)
		     AA = 0;
		  SI = 0;
	  }

      while( SMB0STA != 0x58);
	  STO = 1;
	  SI = 0;

}