LPC4088片内EEPROM使用方法

1.写在前面

  LPC4088是NXP出的Cortex M4内核MCU，带硬件浮点运算，主频高达120MHz。其中一个优势是片内集成4KB EEPROM，省去外挂EERPOM的成本。

2.使用片内EEPROM

  NXP亦提供了类似ST的硬件库，但没有ST做得人性化，但我们也可以直接使用其硬件库，省去配置寄存器的琐碎。使用片内EEPROM，与之相关的是“lpc_eeprom.c”原文件。

2.1 写EEPROM

  NXP硬件库提供的写函数为：

void EEPROM_Write(uint16_t page_offset, uint16_t page_address, void* data, EEPROM_Mode_Type mode, uint32_t count)

封装为常用的函数接口：

void WriteToEeprom(short Addr,char *Buff,short Size)
{
	short Pageaddr,Offsetaddr,Remainsize,Writesize;
	short WritedataAddr;
	
	Pageaddr 		= Addr / 64;	/*页地址*/
	Offsetaddr 		= Addr % 64;	/*页偏移地址*/
	Remainsize		= Size;
	WritedataAddr	= 0;
	EEPROM_PowerDown(DISABLE);		/*开启使能*/
	while(Remainsize > 0)
	{
		if((Offsetaddr + Remainsize) > 64)
			Writesize  = 64 - Offsetaddr;	
		else
			Writesize = Remainsize;
		EEPROM_Write(Offsetaddr,Pageaddr, &Buff[WritedataAddr], MODE_8_BIT, Writesize);
		WritedataAddr += Writesize;
		Offsetaddr 	   = 0;
		Pageaddr   	  += 1;
		Remainsize    -=Writesize;
	}
	EEPROM_PowerDown(ENABLE);		
}

2.2 读EEPROM

  NXP硬件库提供的读函数为：

void EEPROM_Read(uint16_t page_offset, uint16_t page_address, void* data, EEPROM_Mode_Type mode, uint32_t count)

封装为常用的函数接口：

void ReadFromEeprom(short Addr,char *Buff,short Size)
{
	short Pageaddr,Offsetaddr,Remainsize,Readsize;
	short ReaddataAddr;
	
	Pageaddr 		= Addr / 64;		/*页地址*/
	Offsetaddr 		= Addr % 64;		/*页偏移地址*/
	Remainsize		= Size;
	ReaddataAddr	= 0;
	EEPROM_PowerDown(DISABLE);		/*开启使能*/
	while(Remainsize > 0)
	{
		if((Offsetaddr + Remainsize) > 64)
			Readsize  = 64 - Offsetaddr;	
		else
			Readsize = Remainsize;
		EEPROM_Read(Offsetaddr,Pageaddr, &Buff[ReaddataAddr], MODE_8_BIT, Readsize);
		ReaddataAddr  += Readsize;
		Offsetaddr 	   = 0;
		Pageaddr   	  += 1;
		Remainsize    -=Readsize;
	}
		
	EEPROM_PowerDown(ENABLE);		
}