数据读写功能失效

2万 · 2014-2-10 21:08

/*---------------------------------------------------------
*  read/write flash
* Parameters:    cmd:  the command
*                                     can be:             FLASH_READ
*                                                             FLASH_WRITE
*                                                             FLASH_ERASE
*                                           pDat: the input and output register address, target type is 'protect_reg'
*
*                                              e.g. protect_reg dat;
*                                                       dat.addr = 0x1800;       //IAP addr
*                                                       dat.dat  = 0x55;       //IAP dat
*                                                       OperateFlash(FLASH_WRITE, &dat);  //0x55----write to--->0x1800
* Return Value: none
*/
void OperateFlash(const lock_reg_cmd cmd, protect_reg *pDat)
{
      BOOL tmp = EA;
      EA  = 0;
   switch(cmd)
   {
//======================= READ FLASH =======================
   case FLASH_READ:
      case FLASH_WRITE:
      case FLASH_ERASE:
               IFADRH       = pDat->addr>>8;
            IFADRL       = pDat->addr&0xff;
               IFD             = pDat->dat;
               IFMT       = cmd;
               if(UNLOCK_NUMBER == unlockRegVar) //safety
               {
                        ISPCR |= 0x80;       //enable ISP
                        SCMD = 0x46;
                        if(UNLOCK_NUMBER == unlockRegVar) //safety
                        {
                              SCMD = 0xb9;             //start to operate
                        }
            }
               pDat->dat = IFD;
      break;
      default:
      break;
      }
      LOCKREG();
      ISPCR = 0x00;
      IFD = 0xff;          //for safety
      EA = tmp;
}