/* ---------------------------------------------------------------- *
* Write *
* ---------------------------------------------------------------- */
printf( " Writing Flash [%d-%d] pages\n", 0, npages );
/* Iterate through all pages */
for ( page = 0 ; page < npages ; page++ )
{
pageaddr = ( page * NAND_PAGESIZE );
/* Create write pattern */
p32 = ( Uint32* )tx;
for ( i = 0 ; i < segment_len ; i += 4 )
*p32++ = ( pageaddr + i );
/* Write to Flash */
errors = EVMDM6437_NANDFLASH_writePage( ( Uint32 )tx, pageaddr, 1 );
if ( errors )
{
printf( " Found bad page: %d\n", page );
if ( ( ++bad_pages ) > allowed_bad_pages )
{
printf( " >> Error: Too many bad pages %d\n", bad_pages );
return bad_pages;
}
}
/* Skip some pages */
if ( page >= NAND_PAGES_PER_BLOCK )
page += ( NAND_PAGES_PER_BLOCK - 1 );
}
bad_pages = 0;
/* ---------------------------------------------------------------- *
* Read *
* ---------------------------------------------------------------- */
printf( " Reading Flash [%d-%d] pages\n", 0, npages );
/* Iterate through all pages */
for ( page = 0 ; page < npages ; page++ )
{
pageaddr = ( page * NAND_PAGESIZE );
/* Read from Flash */
errors = EVMDM6437_NANDFLASH_readPage( pageaddr, ( Uint32 )rx, 1 );
/* Check pattern */
p32 = ( Uint32* )rx;
for ( i = 0; i < segment_len; i += 4 )
if ( *p32++ != ( pageaddr + i ) )
errors = 1;
if ( errors )
{
printf( " Found bad page: %d\n", page );
if ( ( ++bad_pages ) > allowed_bad_pages )
{
printf( " >> Error: Too many bad pages %d\n", bad_pages );
return bad_pages;
}
}
/* Skip some pages */
if ( page >= NAND_PAGES_PER_BLOCK )
page += ( NAND_PAGES_PER_BLOCK - 1 );
}
bad_pages = 0;
-----------------------------------------------------------------------------------------------------------------------------
上面是一段dm6437读写flash的一段代码，截取自DM6437EVM例程。
其中tx，rx是前面定义的数组，
static Uint8 tx[NAND_PAGESIZE + NAND_SPARESIZE];
static Uint8 rx[NAND_PAGESIZE + NAND_SPARESIZE];
那位大神能给我讲一下，这段代码怎么理解，总感觉这个代码和调试过程中显示的数据对不上。
