eeprom.c

无线音频电话(gprs)

#include <REG52.h>
#include <absacc.h>

#define 	uchar unsigned char 
#define 	uint  unsigned int

sfr WMCON   = 0x96;     /* Watchdog and Memory Control Register */
#define eeprom_free() ((WMCON&0x02) == 0x02)

//=================================
//函数功能：对EEPROM进行写操作
//入口参数：Address--目标的首地址，
//			source--源数据首地址，
//			Number--待写入的字节个数。
//=================================
void WriteUserBlock(uint Address,uchar idata *source,uchar Number)
{
	uchar i = 0;
	if (Number == 0)	return;
	EA = 0;
	while(*source)
	{
		if(i>=(Number-1)) break;	
	   WMCON |= 0x18;			//Enable write data to eeprom
		XBYTE[Address + i] = *source;
		i ++;
		source ++;
	   	while (!eeprom_free());
 		WMCON &=~ 0x18;			//Disable access data from eeprom
	}
	WMCON |= 0x18;			//Enable write data to eeprom
	XBYTE[Address + i] = 0;
	while (!eeprom_free());
	WMCON &=~ 0x18;			//Disable access data from eeprom
	EA = 1;
}

//=================================
//函数功能：对EEPROM进行读操作,从Address开始，读Number个字节。
//入口参数：input--目标的首地址，
//			Address--EEPROM中源数据首地址，
//			Number--待写入的字节个数。
//=================================
void ReadUserBlock(uchar idata *input,uint Address,uchar Number)
{
	uchar i = 0;
	uchar tempchar;
	if (Number == 0)	return;
	EA = 0;
	WMCON |= 0x08;			//Enable access data to eeprom
	while(1)
	{
		tempchar = XBYTE[Address +i];	
		if(tempchar)
		{
			if(i >=(Number-1)) break;
			*input = tempchar;
			input ++;
			i ++;
		}
		else break;
	}
	WMCON &=~ 0x08;			//Disable access data to eeprom
	*input = 0;
	EA = 1;
}