24Cxx 系列EEPROM程序

BRUCE posted @ 2012年8月16日 14:25 in 软件 , 2495 阅读

关于I2C 学习的时候介绍得最多的就是24C02 这里存储EEPROM了，但学的时候基本只是讲讲简单的I2C 的总线数据传输而已，即使先gooogle上搜索也绝大部分这这样的文章，很少有说到如何在实际情况中如何使用的程序。

24Cxx系列数据块存储时也是比较讲究的，

图为几类不同容量的芯片的存储空间结构，24C16以下空间的大于8位后的寻址高位地址在片选地址中选择，详细看芯片手册。另外要注意的就是字节页，一次连续写入的数据量不能超过一页的数据量。有些老款的芯片甚至不支持跨页写入。为了适用也参照不跨页写入的方法写这个程序。而读取数据没有这个限制，只要单片机开辟的缓存够大，可以一直连续读下去。

/*****24Cxx Seriel EEPROM*************************/
#define EEPROM 8    
/**此处定义适用的芯片型号****/
/********
01 -> 24C01;   02 -> 24C02;  04 -> 24C04;   08 -> 24C08;
16 -> 24C16;   32 -> 24C32;  64 -> 24C64;   128 -> 24C128;
256-> 24C256;  512 -> 24C512;  
*/

#if EEPROM==1
   #define PAGE_SIZE           8
   #define EE_SIZE             0x007F
#elif EEPROM==2
   #define PAGE_SIZE           16 
   #define EE_SIZE             0x00FF
#elif EEPROM==4
   #define PAGE_SIZE           16
   #define EE_SIZE             0x01FF
#elif EEPROM==8
   #define PAGE_SIZE           16
   #define EE_SIZE             0x03FF
#elif EEPROM==16
   #define PAGE_SIZE           16
   #define EE_SIZE             0x07FF
#elif EEPROM==32
   #define PAGE_SIZE           32
   #define EE_SIZE             0x0FFF
#elif EEPROM==64
   #define PAGE_SIZE           32
   #define EE_SIZE             0x1FFF
#elif EEPROM==128
   #define PAGE_SIZE           64
   #define EE_SIZE             0x3FFF
#elif EEPROM==256
   #define PAGE_SIZE           64
   #define EE_SIZE             0x7FFF
#elif EEPROM==512
   #define PAGE_SIZE           128
   #define EE_SIZE             0xFFFF
#endif

头文件可以写成预编译模式，方便移植后修改，PAGE_SIZE为一页的存储量，EE_SIZE为芯片的存储量，而后一些程序的判断也根据选择的存储芯片来判断。
顶层用于外部程序调用的函数只有两个，读和写两个情况而已

 unsigned char EEPROM_Write(unsigned char* pBuffer,unsigned int WriteAddress,unsigned char NumbyteToWrite);
 unsigned char EEPROM_Read(unsigned char* pBuffer,unsigned int ReadAddress,unsigned char NumbyteToWrite);

传递函数有三个：
pBuffer:要存储或读出来的数据所在的变量存储区字符串头指针；
WriteAddress/ReadAddress:要存入EEPROM所在的存储空间的第一个存储空间地址；
NumbyteToWrite：数据写入或读出的字节个数；
这样的应用比较简单例如在头文件中分配了两类数据的存储空间起始地址DATA1、DATA2
#define DATA1 0x0010
#define DATA2 0x0050
存储数据所在缓存 EE_Buffer[20]，应用程序如下写法：
EEPROM_Write(EE_Buffer,DATA1,20);
这样EE_Buffer内的数据便被写入EEPROM中 0x10~0x30 的数据存储空间中了。
合理的分配陪EEPROM 的存储空间对数据管理非常重要。甚至于可以作为一个小型黑匣子一样。

unsigned char EEPROM_Write(unsigned char* pBuffer,unsigned int WriteAddress,unsigned char NumbyteToWrite)
{
  unsigned char TempBuffer,Temp2Buffer;
  if((WriteAddress+NumbyteToWrite) > EE_SIZE) //判断是否超出存储空间
    {
      return 0;
    }
  else
    {
      IIC_WriteBuffer(pBuffer,WriteAddress,NumbyteToWrite);
      IIC_WriteBuffer(pBuffer,WriteAddress,NumbyteToWrite);// 连续写入两次避免因EMC等因素造成的写入失败情况

      IIC_ReadBuffer(&TempBuffer,WriteAddress+NumbyteToWrite-1,1);//读取eeprom 的数据与缓存中的数据对比 相同为确认写入成功
      Temp2Buffer=*(pBuffer+NumbyteToWrite-1);
      if(TempBuffer==Temp2Buffer)
         return 1;
      else
	return 0;
    }
}

unsigned char EEPROM_Read(unsigned char* pBuffer,unsigned int ReadAddress,unsigned char NumbyteToWrite) 
{
  if((ReadAddress+NumbyteToWrite) > EE_SIZE) 
    {
      return 0;
    }
  else
    {
      IIC_ReadBuffer(pBuffer,ReadAddress,NumbyteToWrite);
      IIC_ReadBuffer(pBuffer,ReadAddress,NumbyteToWrite);
      return 1;
    }
}

接下来的是是IIC_ReadBuffer、IIC_WriteBuffer，两个函数主要是对存入数据的处理，如页面内写入，超过页面数量的数据处理等，我这里把函数定义为static 函数只能对内部应用，外部只能调用上面的两个函数，累似于API函数一样，这也可以避免不必要的程序调用书写。IIC_ReadBuffer函数相对简单，因为读取没有对页面的限制，可以无限制的读下去。

static   void IIC_ReadBuffer(unsigned char* pBuffer,unsigned int ReadAddress,unsigned char NumbyteToWrite);
static   void IIC_WriteBuffer(unsigned char* pBuffer,unsigned int WriteAddress,unsigned char NumByteToWrite);
void IIC_ReadBuffer(unsigned char* pBuffer,unsigned int ReadAddress,unsigned char NumbyteToWrite)
{
//  u8 NumOfPage=0,NumOfSingle=0;count=0 Part=0,
  u8 PageAddress=0;
  /******pageAddress is over 8bit***********/
#if EEPROM < 32
  PageAddress=(u8)(ReadAddress>>7)&0x0E|ReadAddress_EEPROM;
#else
  PageAddress=WriteAddress_EEPROM;
#endif 

 IIC_ReadPage(pBuffer,PageAddress,ReadAddress,NumbyteToWrite); 
}

读取缓存的函数只对地址做一下判断即可。写入函数较为复杂，需判断数据起始存储地址和页等关系

void IIC_WriteBuffer(unsigned char* pBuffer,unsigned int WriteAddress,unsigned char NumByteToWrite)
{
  u8 NumOfPage=0,NumOfSingle=0; //,count=0
  u16 Part=0;//
  u8 PageAddress=0;

  /******pageAddress is over 8bit***********/
  /******判断存储地址是否超过8位************/
#if EEPROM < 32
  PageAddress=(u8)(WriteAddress>>7)&0x0E|WriteAddress_EEPROM;
#else
  PageAddress=WriteAddress_EEPROM;
#endif 


  /*******判断起始地址与跨页地址的字节个数******/
  Part=WriteAddress/PAGE_SIZE;
  if(Part!=0)
    {
      Part=PAGE_SIZE*(Part+1)-WriteAddress;      
    }
  else 
    {
      Part=PAGE_SIZE-WriteAddress;
    }

 
  if(Part >= NumByteToWrite) /***写入的数据个数小于跨页剩余的个数可直接写入 ***/
    {
      IIC_WritePage(pBuffer,PageAddress,WriteAddress,NumByteToWrite);
    }
  else                       /***1.写入的数据个数大于跨页剩余的个数先把剩余的跨页个数填充满 ***/
    {
      NumOfPage = (NumByteToWrite-Part)/PAGE_SIZE;  
      NumOfSingle = (NumByteToWrite-Part)%PAGE_SIZE;   
      pBuffer = IIC_WritePage(pBuffer,PageAddress,WriteAddress,Part);
    
      NumByteToWrite -= Part;
      WriteAddress += Part;

      while(NumOfPage--)       /***2.按计算的数据量占页面数，连续写入页面*******/
	{     
	  pBuffer = IIC_WritePage(pBuffer,PageAddress,WriteAddress,PAGE_SIZE);

	  WriteAddress += PAGE_SIZE;
	  //  pBuffer += PAGE_SIZE;
	}   
      if(NumOfSingle!=0)      /***3.补充页面写完后超出的不足一页数据量的数据***/
	{
	  IIC_WritePage(pBuffer,PageAddress,WriteAddress,NumOfSingle);
	 
	}
    }
}

剩下的是IIC_WritePage()、IIC_ReadPage()两个函数是芯片的IIC通讯底层函数，根据单片机的IIC通讯模式写入即可。以上的程序可通用到任何24Cxx 系列所应用的程序。

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카지노 우리카지노 카지노는 바카라, 블랙잭, 룰렛 및 슬롯 등 다양한 게임을 즐기실 수 있는 공간입니다. 게임에서 승리하면 큰 환호와 함께 많은 당첨금을 받을 수 있고, 패배하면 아쉬움과 실망을 느끼게 됩니다.

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바카라 사이트 추천 说:
2024年1月23日 17:46

하노이 꼭 가봐야 할 베스트 업소 추천 안내 및 예약, 하노이 밤문화 에 대해서 정리해 드립니다. 하노이 가라오케, 하노이 마사지, 하노이 풍선바, 하노이 밤문화를 제대로 즐기시기 바랍니다. 하노이 밤문화 베스트 업소 요약 베스트 업소 추천 및 정리. https://hanoi-nightlife.com/

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먹튀사이트 说:
2024年1月25日 11:25

No.1 먹튀검증 사이트, 먹튀사이트, 검증사이트, 토토사이트, 안전사이트, 메이저사이트, 안전놀이터 정보를 제공하고 있습니다. 먹튀해방으로 여러분들의 자산을 지켜 드리겠습니다. 먹튀검증 전문 커뮤니티 먹튀클린만 믿으세요!!

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베트남 밤문화 说:
2024年1月25日 15:01

베트남 남성전용 커뮤니티❣️ 베트남 하이에나 에서 베트남 밤문화를 추천하여 드립니다. 베트남 가라오케, 베트남 VIP마사지, 베트남 이발관, 베트남 황제투어 남자라면 꼭 한번은 경험 해 봐야할 화끈한 밤문화로 모시겠습니다.

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블록체인개발 说:
2024年4月23日 14:31

블록체인개발 코인지갑개발 IT컨설팅 메스브레인팀이 항상 당신을 도울 준비가 되어 있습니다. 우리는 마음으로 가치를 창조한다는 철학을 바탕으로 일하며, 들인 노력과 시간에 부흥하는 가치만을 받습니다. 고객이 만족하지 않으면 기꺼이 환불해 드립니다.
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24Cxx 系列EEPROM程序

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