FLASH写不进去,怎么回事?

wutieying 2006-10-18 06:06 楼主

FLASH是SST39VF400A,原理图用的和CCS文档中的提供的,DSP是TMS320C6701,程序跑起来,运行到写数据就死了,不知道怎么回事?
代码如下:
void main()
{
int f;

f = Check_SST_39VF400A();
if(!f)
   return;

Erase_Entire_Chip();
}
int Check_SST_39VF400A()
{
      int*ctrl_addr1;
      int*ctrl_addr2;
      int  SST_id1;
      int  SST_id2;
      int  ReturnStatus;

      /*  Issue the Software Product ID code to 39VF400A */

      ctrl_addr1 = (int*)((int)flash_ptr+(0x5555<<2));
      ctrl_addr2 = (int*)((int)flash_ptr+(0x2aaa<<2));

      *ctrl_addr1= 0xAAAA;                /* write data 0xAAAA to the address1 */

//       ctrl_addr2 = (int*)((int)flash_ptr+(0x2AAA<<2));
//    只能运行到这里!

      *ctrl_addr2= 0x5555;                /* write data 0x5555 to the address2 */

//       ctrl_addr1 = (int*)((int)flash_ptr+(0x5555<<2));

      *ctrl_addr1= 0x9090;                /* write data 0x9090 to the address1 */

      Delay(150);    /* insert delay time = 150 ns       */

      /* Read the product ID from 39VF400A */
ctrl_addr1 = (int*)((int)flash_ptr+(0x0000<<2));
      ctrl_addr2 = (int*)((int)flash_ptr+(0x0001<<2));


      SST_id1  =  *ctrl_addr1;             /* get first ID int             */
      SST_id1  =  SST_id1 & 0xFF;          /* mask of higher char          */
      SST_id2  =  *ctrl_addr2;          /* get second ID int             */

      /* Determine whether there is a SST39VF400A installed or not */

      if ((SST_id1 == SST_ID) && (SST_id2 ==SST_39VF400A))
            ReturnStatus = TRUE;
      else
            ReturnStatus = FALSE;

      /* Issue the Soffware Product ID Exit code thus returning the 39VF400A*/
      /* to the read operating mode                                        */

ctrl_addr1 = (int*)((int)flash_ptr+(0x5555<<2));
      ctrl_addr2 = (int*)((int)flash_ptr+(0x2aaa<<2));

      *ctrl_addr1= 0xAAAA;                /* write data 0xAAAA to the address1 */

      *ctrl_addr2= 0x5555;                /* write data 0x5555 to the address2 */

      *ctrl_addr1= 0xF0F0;                /* write data 0xF0F0 to the address1 */

      Delay(150);       /* insert delay time = 150 ns       */

      return(ReturnStatus);
}