AT45DB161D 擦除算法：// 1 Chip = 16 Sectors = 512 Blocks = 4096 Pages
// 1 Sector = 32 Blocks = 256 Pages
// 1 Block = 8 Pages
//------------------------------------------------------------------------------
// Pm ... Pn [Bm ... Bn] [Sm ... Sn] [Bm ... Bn] Pm ... Pn
//------------------------------------------------------------------------------
// Caller must make dwAddress in Page boundary
// Example : AT45_ErasePages(247*512, 1+1*8+1*256+1*8+1);
//
void AT45_ErasePages(u32 dwAddress, u32 dwPageCount)
{
if ( dwPageCount == 0)
return;
if ( ( dwAddress == 0) && ( dwPageCount >= 4096) )
{
AT45_ChipErase();
return;
}
if ( dwPageCount >= 256 )
{
if ( (dwAddress & 0x1FFFF) == 0x00000000 ) // At Sector boundary
{
while ( dwPageCount >= 256 )
{
AT45_SectorErase(dwAddress);
dwAddress += 256 * 512;
dwPageCount -= 256;
}
BOOT_AT45_ErasePages(dwAddress, dwPageCount);
return;
}
}
if ( dwPageCount >= 8 ) // Erase Blocks until Sector boundary
{
if ( (dwAddress & 0xFFF) == 0x00000000 ) // At Block boundary
{
while ( dwPageCount >= 8 )
{
if ( (dwAddress & 0x1FFFF) == 0x00000000 ) // At Sector boundary
{
if ( dwPageCount >= 256 )
{
BOOT_AT45_ErasePages(dwAddress, dwPageCount);
return;
}
}
AT45_BlockErase(dwAddress);
dwAddress += 8 * 512;
dwPageCount -= 8;
}
BOOT_AT45_ErasePages(dwAddress, dwPageCount);
return;
}
}
while ( dwPageCount > 0 ) // Erase Pages until Block boundary
{
if ( (dwAddress & 0xFFF) == 0x00000000 ) // At Block boundary
{
if ( dwPageCount >= 8 )
{
BOOT_AT45_ErasePages(dwAddress, dwPageCount);
return;
}
}
AT45_PageErase(dwAddress);
dwAddress += 1*512;
dwPageCount -= 1;
}
}
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