nand.c

这是一个基于硬件平台s3c44B0和操作系统为ucos的nandflash的程序

#include "44b.h"
#include "Nand.h"


void SetCommand(UINT8 Command)
{
	volatile UINT8 delay;
	
	NAND_CLE_HIGH();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	CMD_PORT = Command;
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	NAND_CLE_LOW();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
}


void SetAddress32(UINT32 Address)
{
	volatile UINT8 delay;
	
	NAND_ALE_HIGH();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	ADDR_PORT = (Address & 0xFF);
	ADDR_PORT = ((Address >> 8) & 0xFF);
	ADDR_PORT = ((Address >> 16) & 0xFF);
	ADDR_PORT = ((Address >> 24) & 0xFF);
		
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	NAND_ALE_LOW();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
}

void SetAddress24(UINT32 Address)
{
	volatile UINT8 delay;
	
	NAND_ALE_HIGH();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	ADDR_PORT = (Address & 0xFF);
	ADDR_PORT = ((Address >> 8) & 0xFF);
	ADDR_PORT = ((Address >> 16) & 0xFF);
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	NAND_ALE_LOW();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
}


void SetAddress16(UINT32 Address)
{
	volatile UINT8 delay;
	
	NAND_ALE_HIGH();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	ADDR_PORT = (Address & 0xFF);
	ADDR_PORT = ((Address >> 8) & 0xFF);
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	NAND_ALE_LOW();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
}	 	 


void SetAddress8(UINT32 Address)
{
	volatile UINT8 delay;
	
	NAND_ALE_HIGH();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	ADDR_PORT = (Address & 0xFF);
	
	for(delay = 8; delay > 0; delay--)
		delay--;
	
	NAND_ALE_LOW();
	
	for(delay = 8; delay > 0; delay--)
		delay--;
}	 	 
	
	
void NandReset()
{
	NAND_CE_LOW();
	
	SetCommand(CMD_RESET);
	
	WAIT_NAND_READY();
	
	NAND_CE_HIGH();
}


UINT32 NandInit()
{

	rPCONC = rPCONC | 0x10000000;

	NandReset();
	
	return 1;
}
		
			
UINT32 IsBadBlock(UINT32 BlockID)
{
	UINT32 PageID = BlockID << 5;
	UINT32 Address;
	unsigned char	state1;
	
	Address = ((((PageID >> 16) & 0xFF) << 24) |(((PageID >> 8) & 0xFF) << 16) | 
	          ((PageID & 0xFF) << 8) | (VALIDADDR));
	
	NAND_CE_LOW();
	
	SetCommand(CMD_READ2);
	SetAddress32(Address);
	
	WAIT_NAND_READY();
	
	state1 = NAND_IO;
	
	NAND_CE_HIGH();
	
	if(state1 != 0xFF)
		return 1;	/* Bad Block */
	
	return 0;		/* Block is OK  */
}


UINT32 EraseBlock(UINT32 BlockID)
{
	UINT32 PageID = BlockID << 5;
	unsigned char state1;
	
	NAND_CE_LOW();
	
	SetCommand(CMD_ERASE);
	SetAddress24(PageID);
	SetCommand(CMD_ERASE2);
	
	WAIT_NAND_READY();
	
	SetCommand(CMD_STATUS);
	state1 = NAND_IO;
	
	NAND_CE_HIGH();
	
	if(state1 & 0x1)
		return 0;	/* Error in erase */
	
	return 1;		/* Success	  */
}
	

int ReadDeviceID()
{
	volatile int DeviceID;
	
	NAND_CE_LOW();
	
	SetCommand(CMD_READID);
	
	SetAddress8(0x0);
	
	DeviceID = NAND_IO<<8;	/* TOSHIBA is shit */
	DeviceID+= NAND_IO;
	
	NAND_CE_HIGH(); 	
	
	return DeviceID;
}


UINT32 ReadPage(UINT32 BlockID,UINT32 PageID,char *pData)
{
	UINT32 Address = ((BlockID << 5) | PageID) << 8;
	volatile int i;
	
	NAND_CE_LOW();
	
	SetCommand(CMD_READ);
	
	SetAddress32(Address);
	for(i=0;i<10;i++);
	
	WAIT_NAND_READY();
	
	for(i=0;i<512;i++)		
    	{
    		*pData++ = NAND_IO;	
    	}
	/*
	for(i=0;i<32;i++)
    	{
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    		*pData++ = NAND_IO;	
    	}
	*/
	
	NAND_CE_HIGH();
	
	return 512;			/* return the byte count */
}
	

UINT32 WritePage(UINT32 BlockID,UINT32 PageID,char *pData)
{
	UINT32 Address = ((BlockID << 5) | PageID) << 8;
	volatile int i;
	unsigned char state1;
	
	NAND_CE_LOW();
	
	SetCommand(CMD_READ);           /* Set the internal pointer to the first half */
	SetCommand(CMD_WRITE);
	
	SetAddress32(Address);
	for(i=0;i<10;i++);
	
	for(i=0;i<512;i++)		/* Write one page */
    	{
    		NAND_IO = *pData++;	
    	}
    	
    	for(i=0;i<10;i++);
    	
    			
    	SetCommand(CMD_WRITE2);
    	
    	for(i=0;i<10;i++);
    	WAIT_NAND_READY();
    	
    	SetCommand(CMD_STATUS);
    	for(i=0;i<10;i++);
    	
    	state1 = NAND_IO;
    	
    	NAND_CE_HIGH();
    	
    	if(state1 & 0x1)
    		return 0;
    	
    	return 512;
}
///////////////
UINT32 Flash_read(void *pBuffer,UINT32 Sector,UINT32 Unit)
{
UINT32 BlockID,PageID,number;
BlockID=Sector/32;
PageID=Sector%32;
number=ReadPage(BlockID,PageID,pBuffer);
  return 0;

}
UINT32 Flash_write(void *pBuffer,UINT32 Sector,UINT32 Unit)
{
UINT32 BlockID,PageID,number;
BlockID=Sector/32;
PageID=Sector%32;
number=WritePage(BlockID,PageID,pBuffer);
  return 0;
}