oldeepromdg128.c

Code Warrior 4.7 Target : MC9S12DG128B Crystal: 16.000Mhz busclock: 8.000MHz pllclock:16.000MHz

/***********************************
Name:    EEPROMDG128.c
Function:Erase and Program the EEPROM  
Author:  QIU ZHAOPENG  
Data:    2008.10.01
************************************/


#include <hidef.h>          /* common defines and macros */
#include <mc9s12dg128.h>    /* derivative information */
#include "EEPROMDG128.h"



#define EraseInSector         0x40    //erase with sector command
#define ProgramInAlignedWord  0x20    //program with U16 command
//EEPROM address is 0x800 ~ 0xFFF for DG128,from:http://forums.freescale.com/freescale/board/message?board.id=16BITCOMM&message.id=3321&query.id=42737#M3321
#define EepromBeginAdd  0x0800        //eeprom begin address,0x0800=2k
#define EepromEndAdd    0x0c00        //eeprom End address,0x0c00=3k,0x0fff=4k

#define NumberOfWord    2             //the TotalDistance's occupation

void ULongToUInt(U32 *LongData,U16 *U16H,U16 *U16L)
{

	*U16H=(U16)(*LongData/65536);
	*U16L=(U16)(*LongData%65536);
}

void UIntToULong(U32 *LongData,U16 *U16H,U16 *U16L)
{
	U32 intH,intL;
	
	intH=(U32)(*U16H);
	intL=(U32)(*U16L);
	*LongData=(intH*65536+intL);
}

void EepromErase(void) 
{
	U8 *erase;
	
	erase=(volatile unsigned char*)(EepromBeginAdd);
	ECLKDIV=0x4A;	//16M/8=2M,2M/(1+10)=181.8k in the range 150k--200k
	
	DisableInterrupts;
	
	//erase the eeprom	
	while(erase <= (volatile unsigned char*)(EepromEndAdd))
	{
		while(!ECLKDIV_EDIVLD); //if the ECLKDIV has been writen once after reset	
		while(!ESTAT_CBEIF);		//whether the command buffer is empty
		while(!EPROT_EPOPEN);	  //whether the eeprom is enabled to program or erase 
		
		ECMD=EraseInSector;
		ESTAT_CBEIF=1;
		
		while(!ESTAT_CCIF)	//whether the command is complete
		{}
		
		erase+=4;
	}
	
	EnableInterrupts;
}

//program one data(4bytes) to EEPROM
void EepromProgram(U32 data)
{
	int i=0;
	U16 *eeaddr;	//eeprom pointer
	U16 dataHL[2];

	dataHL[0]=0;
	dataHL[1]=0;
	
	EepromErase();
	
	eeaddr=(volatile U16*)(EepromBeginAdd);
	ECLKDIV=0x4A;	//16M/8=2M,2M/(1+10)=181.8k in the range 150k--200k
	
	DisableInterrupts;
	
	ULongToUInt(&data,&dataHL[0],&dataHL[1]);
	
	while(i<NumberOfWord)	
	{
		while(!ECLKDIV_EDIVLD); //if the ECLKDIV has been writen once after reset	
		while(!ESTAT_CBEIF);		//whether the command buffer is empty
		while(!EPROT_EPOPEN);	  //whether the eeprom is enabled to program or erase	
			
		*eeaddr=dataHL[i];  
			
		ECMD=ProgramInAlignedWord;	//program the eeprom
		ESTAT_CBEIF=1;
		
		while(!ESTAT_CCIF)	//whether the command is complete
		{}
		
		eeaddr++;
		i++;
	}	
	
	EnableInterrupts;
}

U32 ReadFromEeprom(void)
{
	U16 *eeaddr;
	U16 dataH=0;
	U16 dataL=0;
	U32 data=0;
	
	eeaddr=(volatile U16*)(EepromBeginAdd);
	
	DisableInterrupts;
	dataH=*eeaddr;
	dataL=*(eeaddr+1);
	UIntToULong(&data,&dataH,&dataL);
	EnableInterrupts;
	
	return(data);
}