LPC2478 Nand Flash 问题

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mwm8412|

楼主 | 2008-11-14 10:49 | 只看该作者回帖奖励

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LPC2478, NAND, flash, AD, DDR

我在LPC2478芯片上实现NAND FLASH的读写。我现在已经可以将ID读出来，可是读写FLASH内的数据都是错的，不知道是哪里错了，还请高手帮忙解决
static U32 NFWaitBusy( void )
{
U8 stat;

NFWrCmd(QUERYCMD) ;
do
{
  stat = NFRdDat();
}
while ( !( stat & 0x40 ) ) ;

NFWrCmd(READCMD0) ;
return stat & 1 ;
}

static U32 NFReadID( void )
{
U32 id, loop = 0;
NFChipEn();
NFWrCmd( RESETCMD );
NFWrAddr( 0 );
Delay( 2 );
NFWrCmd( READIDCMD );
NFWrAddr( 0 );
while ( ( NFIsBusy() ) && ( loop < 10000 ) )
  loop++;
if ( loop >= 10000 )
  return 0;
id = NFRdDat() << 8;
id |= NFRdDat();
NFChipDs();

return id;
}

U32 NFEraseBlock( U32 addr )
{
U8 stat;

addr &= NAND_BLOCK_MASK;

NFChipEn();
NFWrCmd( ERASECMD0 );
NFWrAddr( addr );
NFWrAddr( addr >> 8 );
if ( NandAddr )
  NFWrAddr( addr >> 16 );
NFWrCmd( ERASECMD1 );
stat = NFWaitBusy();
NFChipDs();

//printf( "Erase block 0x%08x %s " , addr , stat ? "fail" : "ok" );

return stat;
}

//addr = page address
void NFReadPage( U32 addr , U8* buf )
{
U16 i;
NFChipEn();
NFWrCmd( READCMD0 );
NFWrAddr( 0 );
NFWrAddr( addr );
NFWrAddr( addr >> 8 );
if ( NandAddr )
  NFWrAddr( addr >> 16 );
// InitEcc();
NFWaitBusy();
for ( i = 0; i < NAND_SECTOR_LEN; i++ )
  buf = NFRdDat();
NFChipDs();
}
//addr = page address
U32 NFWritePage( U32 addr , U8* buf )
{
U32 i = NAND_SECTOR_LEN, stat;
while (NFIsBusy());
NFChipEn();
NFWrCmd( READCMD0 );
NFWrCmd( PROGCMD0 );
NFWrAddr( 0 );
NFWrAddr( addr );
NFWrAddr( addr >> 8 );
if ( NandAddr )
  NFWrAddr( addr >> 16 );
// InitEcc();
while(i--)
  NFWrDat( *buf++ );

NFWrCmd( PROGCMD1 );
stat = NFWaitBusy();
NFChipDs();
return stat;
}

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