mmu.c

image capture billing control system

/*
xByte	AuxRam[512]	_at_	0;
xByte	MmcBuffer[512]	_at_	0x200;

void SectorBufferToAuxRam512 (void)
{
	Word i,addr;

	addr = 511;
	for (i=0 ; i<512 ; i++)
	{
		MMU_AddrHigh = addr / 256;
		MMU_51Addr   = addr % 256;
		AuxRam[i] = MMU_Data;
		addr--;
	}
}
*/

//void LCD_Clear();
//void PrintBHEX(Byte);
void MMU_Pointer_Set(Word pointer)
{
	MMU_AddrHigh = (pointer/256 == 0)? 0: 0x41;
	MMU_51Addr = pointer;
	MMU_CardAddr = pointer;
/*
	LCD_Clear();
	PrintBHEX(MMU_AddrHigh);
	PrintBHEX(MMU_51Addr);
	Delay(50000);
*/
}

//static Byte Read_MMU(Word pointer)
Byte Read_MMU(Word pointer)
{
	MMU_Pointer_Set(511-pointer);
	return MMU_Data;
}

void Write_MMU(Word pointer, Byte x)
{
	MMU_Pointer_Set(511-pointer);
	MMU_Data = x;
}

void Write_MMU_Word(Word pointer, Word x)
{
	MMU_Pointer_Set(511-pointer);
	MMU_Data = x;
	MMU_Pointer_Set(511-pointer-1);
	MMU_Data = x/256;
}

Word MMU_Byte2Word(Word x)
{
	return(Read_MMU(x+1)*0x100 + Read_MMU(x));
}

Dword MMU_Byte2Dword(Word x)
{
	return(Read_MMU(x+3)*0x1000000
		+ Read_MMU(x+2)*0x10000
		+ Read_MMU(x+1)*0x100
		+ Read_MMU(x));
}

void Clear_MMU()
{
	Word i;

	for( i=0 ; i<512 ; i++)
	{
		Write_MMU(i, 0xff);
	}
}