flash操作.txt

很全的flash芯片驱动程序包括：SST28SF040

void flash_write_BYTE(UINT PA,UCHAR PD)
     {
     pointer = 0x0555;
     *pointer = 0xaa;
     pointer = 0x02aa;
     *pointer = 0x55;
     pointer = 0x0555;
     *pointer = 0xa0;
     pointer = PA;
     *pointer = PD;
     }

void flash_write_enable(void)
     {
     UCHAR i;
     for(i=0; i<10; i++)
         {
         }
     pointer = 0x0555;
     *pointer = 0xaa;
     pointer = 0x02aa;
     *pointer = 0x55;
     pointer = 0x0555;
     *pointer = 0xa0;
     for(i=0; i<10; i++)
         {
         }
     }

void flash_sector_erase(UCHAR SA)
     {
     pointer = 0x0555;
     *pointer = 0xaa;
     pointer = 0x02aa;
     *pointer = 0x55;
     pointer = 0x0555;
     *pointer = 0x80;
     pointer = 0x0555;
     *pointer = 0xaa;
     pointer = 0x02aa;
     *pointer = 0x55;
     pointer = SA;
     *pointer = 0x30;
     }

flash_autoselect(UCHAR pa)
     {
     UCHAR pd;
     pointer = 0x0555;
     *pointer = 0xaa;
     pointer = 0x02aa;
     *pointer = 0x55;
     pointer = 0x0555;
     *pointer = 0x90;
     pointer = pa;
     pd = *pointer;
     *pointer = 0xf0;      
     return(pd);
     }