flash.c

DataFlash芯片AT45DB081读写程序

	}
	At45DB081_Deselect();
	if(At45DB081_ReadStatus()==0xff)return False;//fail to write
	if(!At45DB081_AutoPageReWrite())return False;//fail to auto page rewrite 
	return True;//write successfully 	
}	

/*************************************************************************************
Warning:When write one word or long to flash,the lowwest byte ahead

**************************************************************************************/

uchar FlashWriteData(ulong FlashAdd,ulong ByteNum,uchar * Data)//write flash
//return True:write successfully, return False:fail to write
{
	ulong idata temp1,temp3;
	uint  idata temp2,temp4;
	uint idata i;	
//	uchar idata j;
	if(FlashAdd+ByteNum > FlashMaxByte)return False;
	temp1=FlashAdd;
	temp2=0;
	for(;;)
	{
		i=0;
		temp3=temp1;
		temp4=temp2;
		do
		{
			i++;
			temp2++;
			temp1++;
			if(temp2==ByteNum)break;
		}
		while(temp1%FlashPageBytes);//not exceed the current page range
		if(!At45DB081_WritBytesInPage(temp3,i,(Data+temp4))) return False;//fail to write
		if(temp2==ByteNum)break;
	}
	/*
	j=0;
	do//make check sum
	{
		if((FlashAdd>FlashRangeAdd[j])&&(FlashAdd<FlashRangeAdd[j+1]))
		{
			if(FlashMakeCheckSum(j))return True;//make check sum to Flash
			else return False;
		}
		else j++;	
	}while(j<FlashDataRangeNum);
	return False;//fail to write 
	*/
	return True;//successfully to write 
}

void FlashReadData(ulong FlashAdd,ulong ByteNum,uchar * Data)//read flash
{
	ulong idata temp1,temp3;
	uint  idata temp2,temp4;
	uint idata i;	
	if(FlashAdd+ByteNum > FlashMaxByte)return;
	temp1=FlashAdd;
	temp2=0;
	for(;;)
	{
		i=0;
		temp3=temp1;
		temp4=temp2;
		do
		{
			i++;
			temp2++;
			temp1++;
			if(temp2==ByteNum)break;
		}
		while(temp1%FlashPageBytes);//not exceed the current page range
		At45DB081_ReadBytesInPage(temp3,i,(Data+temp4));//read bytes from one page
		if(temp2==ByteNum)break;
	}
}

uchar FlashGetCheckSum(uchar RangeNum)//get check sum form Flash
//return True:true return False:error
{
	uint i;
	ulong temp;
	uchar CheckSumTemp,m;
	uchar FlashTempBuf;
	if(RangeNum>FlashDataRangeNum)return False;

	CheckSumTemp=0;
	temp=0;
	At45DB081_Select();
	At45DB081_WriteCmd(Opcode_ContinuousRead,FlashRangeAdd[RangeNum]);
	At45DB081_SendDoNotCareBits(32);//wait the AT45DB081 read finish
	ClrSCLK();
	SetSCLK();
	for(;;)
	{
		for(i=0;i<8;i++)//send command,MSB
		{
			ClrSCLK();
			m<<=1;
			if(SI)  m |= 0x01;
			SetSCLK();
		}
		CheckSumTemp+=m;
		if(++temp==FlashRangeNum[RangeNum])break;
	}
	At45DB081_Deselect();

	At45DB081_ReadBytesInPage(FlashAdd_CheckSum+RangeNum*2,1,&FlashTempBuf);
	if(FlashTempBuf!=CheckSumTemp)return False;
	return True;
}

uchar FlashMakeCheckSum(uchar RangeNum)//make check sum to Flash
//return True:wrire true return False:error
{
	uint i;
	ulong temp;
	uchar CheckSumTemp,m;

	if(RangeNum>FlashDataRangeNum)return False;
//printf("MakeSum,RangeNum=%x\n",(uint)RangeNum);

	CheckSumTemp=0;
	temp=0;
	At45DB081_Select();
	At45DB081_WriteCmd(Opcode_ContinuousRead,FlashRangeAdd[RangeNum]);
	At45DB081_SendDoNotCareBits(32);//wait the AT45DB081 read finish
	ClrSCLK();
	SetSCLK();
	for(;;)
	{
		for(i=0;i<8;i++)//send command,MSB
		{
			ClrSCLK();
			m<<=1;
			if(SI)  m |= 0x01;
			SetSCLK();
		}
		CheckSumTemp+=m;
		if(++temp==FlashRangeNum[RangeNum])break;
	}
	At45DB081_Deselect();

//printf("MakeSum,Add=%lx,Sum=%x\n",(ulong)FlashRangeAdd[RangeNum],(uint)CheckSumTemp);

	if(At45DB081_WritBytesInPage(FlashAdd_CheckSum+RangeNum*2,1,&CheckSumTemp))return True;

	return False;
}

uchar FlashWritePassCode(uchar PassCodeNum,uchar * PassCodeAdd)
//write passcode to Flash,return 1:write successfully,return 1:Write Fail
{
//uchar j;
//printf("Write PassCode=");
//for(j=0;j<FlashDataPassCodeLen;j++)
//printf("%x ",(uint)*(PassCodeAdd+j));
//printf("\n");
	if(PassCodeNum>FlashDataPassCodeNum)return False;//write error
	if(!At45DB081_WritBytesInPage(FlashAdd_PassCode+FlashDataPassCodeLen*PassCodeNum,
		FlashDataPassCodeLen,PassCodeAdd))//write bytes to one page
		return False;
	return (FlashMakeCheckSum(0));//make check sum to Flash	
}

uchar FlashComparePassCode(uchar *PassCodeAdd)
//compare the *PassCodeAdd with the Flash Saved,if true,return the PassCode Number,else return 0xff
{
	uchar idata i,j;
	uchar idata FlashTempBuf[FlashDataPassCodeLen];
//printf("Be compared PassCode=");
//for(j=0;j<FlashDataPassCodeLen;j++)
//printf("%x ",(uint)*(PassCodeAdd+j));
//printf("\n");
	for(i=0;i<FlashDataPassCodeNum;i++)
	{
		At45DB081_ReadBytesInPage(FlashAdd_PassCode+FlashDataPassCodeLen*i,
						FlashDataPassCodeLen,&FlashTempBuf[0]);//read bytes from PassCode Add
//printf("Read PassCode %d=",(uint)i);
//for(j=0;j<FlashDataPassCodeLen;j++)
//printf("%x ",(uint)FlashTempBuf[j]);
//printf("\n");
		for(j=0;j<FlashDataPassCodeLen;j++)
		{
			if(*(PassCodeAdd+j) != FlashTempBuf[j])break;
		}
		if(j==FlashDataPassCodeLen)return i;
	}
	return 0xff;
}

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
{
	uchar idata i;
	uchar idata FlashTempBuf[FlashDataValidFlagNum];
	//read the Valid Data flag bytes
	FlashReadData(FlashAdd_DataValidFlag,4,&FlashTempBuf[0]);
	for(i=0;i<FlashDataValidFlagNum;i++)
	{
		if(FlashTempBuf[i]!=FlashDataValidFlag[i])//found the flash datas are invalid
			return 0xff;
	}
//declare the CheckSum,from the Top of the flash
//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)
//5th CheckSum:the frist 264*2 bytes(0x00-0x210)(they are used for saving some system message)
	for(i=0;i<FlashDataRangeNum;i++)
	{
		if(!FlashGetCheckSum(i))//check sum error
			return (0x80|i);
	}
	return 0;
}

uchar FlashWriteOptRecord(ulong FlashAdd,uchar *Data,uint DataLen)//write operation record to Flash
//return False:fail,return True:success
{
	if((FlashAdd+DataLen)>FlashNum_OptRecord)return False;
	return (FlashWriteData(FlashAdd+FlashAdd_OptRecord,DataLen,Data));//write flash
}

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 idata i;
	if(!FlashAdd)FlashAdd=FlashAdd_OptRecord;
	FlashReadData(FlashAdd,LockIDByteLen,(uchar *)OptData);//read Lock ID
	
	for(i=0;i<LockIDByteLen;i++)
	{
		if(*(uchar *)OptData != 0x00)break;
		((uchar *)OptData)++;
	}
	if(i==LockIDByteLen)return 0;//no other Operation Item
	FlashAdd += LockIDByteLen;
	FlashReadData(FlashAdd,LockIDOptSortByteLen,(uchar *)OptData);//read Lock Opt Sort
	FlashAdd++;
	((uchar *)OptData)++;
	while(1)
	{
		FlashReadData(FlashAdd,1,(uchar *)OptData);//read Lock Name
		FlashAdd++;
		if(!(*(uchar *)OptData))break;
		((uchar *)OptData)++;
	}
	return FlashAdd;//return next Opt Item Address
}

uchar FlashWriteSelfLrn(ulong FlashAdd,uchar *Data,uint DataLen)//write operation record to Flash
//return False:fail,return True:success
{
	if((FlashAdd+DataLen)>FlashNum_SelfLrn)return False;
	return (FlashWriteData(FlashAdd+FlashAdd_SelfLrn,DataLen, Data));//write flash
}

/*
void At45DB081_Buf1Write(uint Add,uint ByteNum,uchar * Data)
{
	uint j;
	uchar i;
printf("Write Bytes To Buf1!Add=%x,ByteNum=%x,DataPtr=%x\n",(uint)Add,(uint)ByteNum,(uint)Data);
	At45DB081_Select();
	
	At45DB081_WriteCmd(Opcode_Buf1Write,Add);
	for(j=0;j<ByteNum;j++)
	{
		for(i=0;i<8;i++)//send bytes,MSB
		{
			ClrSCLK();
			if((*(Data+j)) & Or8BitTab[7-i])
			{
				SetSO();
			}
			else
			{
				ClrSO();
			}
			SetSCLK();
		}
	}

	At45DB081_Deselect();
}

void At45DB081_Buf1Read(uint Add,uint ByteNum,uchar * Data)
{
	uint j;
	uchar i;
printf("Read Bytes From Buf1!Add=%x,ByteNum=%x,DataPtr=%x\n",(uint)Add,(uint)ByteNum,(uint)Data);
	At45DB081_Select();
	
	At45DB081_WriteCmd(Opcode_Buf1Read,Add);
	At45DB081_SendDoNotCareBits(8);
	ClrSCLK();
	SetSCLK();
	for(j=0;j<ByteNum;j++)
	{
		for(i=0;i<8;i++)//send command,MSB
		{
			ClrSCLK();
			_nop();
			if(SI)  (*(Data+j)) |= Or8BitTab[7-i];
			else (*(Data+j)) &= And8BitTab[7-i];
			SetSCLK();
		}
printf("%02x ",(uint)(*(Data+j)));
	}
printf("\n");

	At45DB081_Deselect();
}
*/