flash.h

DataFlash芯片AT45DB081读写程序

#ifndef _FLASH_H
#define _FLASH_H

#include "typedef.h"

//define only for 89c52 testing 
#define ClrSCLK() 		{P1_3=0;}
#define SetSCLK() 		{P1_3=1;}
#define ClrAt45081CS() 	{P1_2=0;}
#define SetAt45081CS() 	{P1_2=1;}
#define ClrSO()			{P1_4=0;}
#define SetSO()			{P1_4=1;}
#define SI					(P1_5)

#define _AT45DB081

#define FlashPageBytes	264

#ifdef  _AT45DB041
#define FlashMaxPage		2048
#endif

#ifdef  _AT45DB081
#define FlashMaxPage		4096
#endif

#ifdef  _AT45DB161
#define FlashMaxPage		8192
#endif

#define FlashMaxByte		FlashPageBytes*FlashMaxPage

//the absolute frist write Flash,we must initialize the all flash to 0x00
#define FlashDataValidFlag1	0x55
#define FlashDataValidFlag2	0x00
#define FlashDataValidFlag3	0xFF
#define FlashDataValidFlag4	0xAA

#define FlashMinAddress 0	//the frist was reserved for system using
#define FlashMaxAddress 264*4096	//the maximum Flash address

//system reserved function define
#define FlashDataValidFlagNum			4
//1st CheckSum:the Chinese Character Lib's CheckSum(0xC6000-0x108000)
//2nd	CheckSum:the self learn message's CkeckSum(0x74040-0xC6000)
//3rd CheckSum:the operation record's CheckSum(0x5B020-0x74040)
//4th	CheckSum:the recall message's CheckSum(0x30048-0x5B020)
//5th	CheckSum:the reserved sector's CheckSum(0x210-0x30048)
//6th CheckSum:the frist 528 bytes(0x00-0x210)(they are used for saving some system message)
#define FlashDataCheckSumBytesNum	40		//40 bytes check sum
#define FlashReWritePageNumByteNum	2		//2 bytes Autopage rewrite

//save the Data valid flag,if the 4 bytes are not same as 4 ValidFlag above,must initialize 
//all flash bytes to 0x00,start from 0x00,occupy 4 bytes
#define FlashAdd_DataValidFlag	0x00	
//20 checksum,occupy 40 bytes,one checksum 2 bytes,low byte ahead.
#define FlashAdd_CheckSum			(FlashAdd_DataValidFlag+FlashDataValidFlagNum)
//2 bytes Autopage rewrite for At45DB081
#define FlashAdd_ReWritePageNum	(FlashAdd_CheckSum+FlashDataCheckSumBytesNum)

//flash start address:for this,applition program can use
#define FlashAdd_DataStartAddress		66		//start address from 66

//all flash is divided 6 parts
#define FlashDataRangeNum					6
#define FlashRangeNum_SystemUsed			0
#define FlashRangeNum_ReservedSector	1
#define FlashRangeNum_RecallRecord		2
#define FlashRangeNum_OptRecord			3
#define FlashRangeNum_SelfLrn				4
#define FlashRangeNum_HanZiLib			5


#define FlashDataPassCodeLen		6		//6 bytes passcode
#define FlashDataPassCodeNum		5		//5 number passcode
#define FlashDataPassCodeBytes	(FlashDataPassCodeLen*FlashDataPassCodeNum)//30 bytes passcode,5 number and per 6 bytes 

//5 passcode,occupy 30 bytes,one passcode 6 bytes,low byte ahead.
#define FlashAdd_PassCode			FlashAdd_DataStartAddress


//system message used
#define FlashAdd_SystemUsed		FlashAdd_DataStartAddress
#define FlashNum_SystemUsed		(0x210-FlashAdd_DataStartAddress)

//reserved for 191KBytes
#define FlashAdd_ReservedSector	0x210
#define FlashNum_ReservedSector	0x2FE38

//recall data stored for 172KBytes
#define FlashAdd_RecallRecord		0x30048
#define FlashNum_RecallRecord		0x2AFD8

//operation record stored for 100KBytes
#define FlashAdd_OptRecord			0x5B020			
#define FlashNum_OptRecord			0x19020

//Self learn message stored for 328KBytes
#define FlashAdd_SelfLrn			0x74040
#define FlashNum_SelfLrn			0x38FA0
#define FlashAdd_Logic				0xACFE0//store logic for 100KBytes 
#define FlashNum_Logic				0x19020//store logic for 100KBytes 


//Chinese character stored for 260KBytes,the address lies the Top 260KBytes of Flash(from 0xC6000)
#define FlashAdd_HanZiLib			0xC6000
#define FlashNum_HanZiLib			0x42000

//Operation Record define
#define LockIDByteLen				3
#define LockIDOptSortByteLen		1

extern uchar FlashWriteData(ulong FlashAdd,ulong ByteNum,uchar * Data);//write flash
//return 1:write successfully, return 0:fail to write

extern void FlashReadData(ulong FlashAdd,ulong ByteNum,uchar * Data);//read flash
extern void At45DB081_ReadBytesInPage(ulong Add,uint ByteNum,uchar * Data);//read bytes from one page
extern uchar At45DB081_WritBytesInPage(ulong Add,uint ByteNum,uchar * Data);//write bytes to one page
//if return 1:write successfully,return 0:write fail

extern uchar FlashSelfTest(void);
//return 0x00:test true;return 10XX XXXX(the bit 7=1):error,the low 7 bits note 
//the error CheckSum sector(<64);return 0xff,all datas in flash are invalid
extern uchar FlashGetCheckSum(uchar RangeNum);//get check sum from Flash
//return 1:true return 0:error
extern uchar FlashMakeCheckSum(uchar RangeNum);//make check sum and write to Flash
//return 1:wrire true return 0:error
extern uchar FlashWritePassCode(uchar PassCodeNum,uchar * PassCodeAdd);
//write passcode to Flash,return 1:write successfully,return 1:Write Fail
extern uchar FlashComparePassCode(uchar *PassCodeAdd);
//compare the *PassCodeAdd with the Flash Saved,if true,return the PassCode Number,else return 0xff

extern uchar FlashWriteOptRecord(ulong FlashAdd,uchar *Data,uint DataLen);//write operation record to Flash
//return False:fail,return True:success
extern uchar FlashWriteSelfLrn(ulong FlashAdd,uchar *Data,uint DataLen);//write operation record to Flash
//return False:fail,return True:success
extern ulong FlashReadOptRecord(ulong FlashAdd,uchar * OptData);
//if FlashAdd=0,frist read
//Read operation Item,if True:return the Next Operation Item address.
//When no next Operation Item,return 0
uchar FlashMakeCheckSum(uchar RangeNum);//make check sum to Flash
//return True:wrire true return False:error
void At45DB081_Buf1Write(uint Add,uint ByteNum,uchar * Data);
void At45DB081_Buf1Read(uint Add,uint ByteNum,uchar * Data);


#endif