nand.c

arm7 的音乐播放程序

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

#include <string.h>

///////////

#define	SIZE_16M	0x01000000
#define	SIZE_32M	0x02000000
#define	SIZE_64M	0x04000000
#define	SIZE_128M	0x08000000

#ifndef NAND_FLASH_16M
    static U16 uiNandAddr;
#endif

static int bSupportNAND;
static	U32 NandID;

struct NFChipInfo
{
	U32 uiID;
	U32 uiSize;
};

//Two Para ID and Size
static struct NFChipInfo NandFlashChip[] = { 
    {0xec73, SIZE_16M},
	{0xec75, SIZE_32M},
	{0xec76, SIZE_64M},
	{0xec79, SIZE_128M},
	{0, 0},
};

struct Partition
{
	U32 uiOffset;
	U32 uiSize;
	char *name;
};

struct Partition *pNandPart;

U32 NandFlashSize;
////////////////


U8 NFWaitBusy(void)			//Just wait for the Ans
{
	U8 ucStatus;
	
	NFWrCmd(QUERYCMD);
	do
	{
		ucStatus = NFRdDat();
	}
	while( !(ucStatus&0x40) );
	
	NFWrCmd(READCMD0);
	
	return (ucStatus&1);
}


U32 NFReadID(void)
{
	U32 id, loop = 0;

	NFEnable();
	NFWrCmd(READIDCMD);
	NFWrAddr(0);
	while(NFIsBusy()&&(loop<10000)) loop++;
	if(loop>=10000)
		return 0;
	id  = NFRdDat()<<8;
	id |= NFRdDat();
	NFDisable();
	
	return id;
}


void NandFlashInit(void)	
{
	U32 uiIDNumber;	
		
	bSupportNAND = FALSE;	
	NandID = NFReadID();	
	
	for(uiIDNumber=0; NandFlashChip[uiIDNumber].uiID!=0; uiIDNumber++)
    {
    	if(NandFlashChip[uiIDNumber].uiID==NandID)
    	{			
    		//NandID = uiIDNumber;
    		NandFlashSize = NandFlashChip[uiIDNumber].uiSize;	
    					
    		bSupportNAND  = TRUE;  		
    		
    		if(!pNandPart[0].uiSize)
    		{
    			pNandPart[0].uiOffset = 0;
    			pNandPart[0].uiSize   = NandFlashSize;
    			pNandPart[1].uiSize   = 0;				
    		}
    		
    Uart_Printf("The NandFlash ID is 0x%x\n",NandID);
	Uart_Printf("The NandFlash Size is 0x%x\n",NandFlashSize);
	
	return;
		}
	}	
	return;
	
}

U8 NFReadStat(void)
{	
	U8 ucStatus;
	NFEnable();
	
	NFWrCmd(QUERYCMD);	//Reading the State R
	ucStatus = NFRdDat();
	
	NFDisable();
	return ucStatus;
}

U8 NFEraseBlock(U32 uiBlockAdd)
{	
	U8 ucStatus;
	
	uiBlockAdd &=~0x1f;			//Only A14~A23 is useful
	
	NFEnable();
		
	NFWrCmd(ERASECMD0);
	
	NFWrAddr(uiBlockAdd);		//Address 
	NFWrAddr(uiBlockAdd >> 8);
	
	NFWrCmd(ERASECMD1);			//Erase
	
	ucStatus=NFWaitBusy();		//Getting the statue
	
	NFDisable();
	
	if(ucStatus==1)
	{
	Uart_Printf("Erase block 0x%08x %s\n failed", uiBlockAdd);	
	}
	return ucStatus;
}


void NFReadPage(const U32 uiPageAddr, U8 *pcDst)
{
	U32 i;
	U8 ucStatus;	
	
	NFEnable();
	
	NFWrCmd(READCMD0);
	
	NFWrAddr(0);
	NFWrAddr(uiPageAddr);
	NFWrAddr(uiPageAddr >> 8);
	
	ucStatus=NFWaitBusy();
	
	for(i=0 ; i<512; i++)
	{
		pcDst[i] = NFRdDat();		
	}
	
	NFDisable();
	
	return;
}

U8 NFWritePage( const U32 uiPageAddr,const U8 *pcSrc )
{
	int i,j;
	U8 ucStatus;
	
	NFEnable();
	NFWrCmd( PROGCMD0 );
	
	NFWrAddr( 0);
	NFWrAddr( uiPageAddr );
	NFWrAddr( uiPageAddr >> 8 );
	
	for(i=0; i<512; i++)		//Writing the Buffer Data
	{
		NFWrDat(pcSrc[i]);
	}
	
	if(!uiPageAddr) 
	{
		NFWrDat( 'b' );
		NFWrDat( 'o' );
		NFWrDat( 'o' );
		NFWrDat( 't' );		
	}

	NFWrCmd( PROGCMD1 );
	ucStatus = NFWaitBusy();
	
	NFDisable();

	if(ucStatus)			//Checking the Writing 
	{
	Uart_Printf("Write nand flash 0x%x fail\n", uiPageAddr);
	}	
/*
验证工作：将写入的NandFlash内容再读出 放入ucReadData[]中
ucReadData[]与Buf[]
*/
	else
  {
	U8 ucReadData[512];		//Checking the data
	
	NFReadPage(uiPageAddr, ucReadData);	//
	
	for(j=0 ;j<512 ;j++)
	{
		if( ucReadData[j] != pcSrc[j] )
		{
		Uart_Printf("Check data fail\n");
		ucStatus = 1;
		break;
		}
	 }
	}
	return ucStatus;
}

 U8 NFChkBadBlk( U32 uiBlockAddr )
{
	U8 ucData;
	
	uiBlockAddr &= ~0x1f;   //不用A9~A13
	
	NFEnable();
	
	NFWrCmd(READCMD2);	//point to area c
	
	NFWrAddr(5);		//mark offset 5  Why ???  By cazy
	
	NFWrAddr(uiBlockAddr);
	NFWrAddr(uiBlockAddr >> 8);

	NFWaitBusy();
	
	ucData = NFRdDat();
	
	NFWrCmd(READCMD0);	//point to area a
	
	NFDisable();

	return ( ucData != 0xff );
	//if ucData=0xff --> (ucData!= 0xff)=0--->不是坏块
}

/*
坏块的处理： 在坏块的第一页的 空闲区域 的 第6个字节 写上 非ff的内容
*/