#define FLASH_START_ADDR         0x0000
#define FLASH _ADDR_UNLOCK1      0x555
#define FLASH _ADDR_UNLOCK2      0x2aa
#define FLASH _DATA_UNLOCK1      0xaaaa
#define FLASH _DATA_UNLOCK2      0x5555
#define FLASH _SETUP_ERASE       0x8080
#define FLASH _CHIP_ERASE        0x1010
#define UINT16 unsigned short
int FlashStatusDetect(UINT16 *ptr,UINT16 Data, int TimeCounter);
int Main()
{
   int i;
     volatile UINT16 *flashptr=(UINT16 *) FLASH _START_ADDR;
     *((volatile UINT16 *) FLASH_START_ADDR+ FLASH _ADDR_UNLOCK1) =FLASH _DATA_UNLOCK1;
     *((volatile UINT16 *) FLASH _START_ADDR+ FLASH _ADDR_UNLOCK2) =FLASH _DATA_UNLOCK2;
     *((volatile UINT16 *) FLASH _START_ADDR+ FLASH _ADDR_UNLOCK1) =FLASH _SETUP_ERASE;
     *((volatile UINT16 *) FLASH_START_ADDR+ FLASH_ADDR_UNLOCK1) =FLASH _DATA_UNLOCK1;
     *((volatile UINT16 *) FLASH_START_ADDR+ FLASH_ADDR_UNLOCK2) =FLASH _DATA_UNLOCK2;
     *((volatile UINT16 *) FLASH_START_ADDR+ FLASH_ADDR_UNLOCK1) =FLASH _CHIP_ERASE;
     if(FlashStatusDetect((UINT16 *)flashPtr, 0xffff, 0x1000000)!=1)  
        printf("ERROR!");
     return(0);
}
 int FlashStatusDetect(UINT16 *ptr, UINT16 Data, int TimeCounter)
{
   int tmp=TimeCounter;
   volatile UINT16 *P=ptr;
   UINT16 data1, data2,current_data;
   current_data=Data & 0x8080;
   while((*p& 0x8080) !=current_data)
   {
    if(tmp-- <=0)
    return 0;
   }
   return 1;
}