标签: lpc21xx

Rule : The reserved ARM interrupt vector location(0x0000 0014) should contain the 2's complement of the check-sum of the remaining interrupt vectors. This causes the checksum of all of the vectors together to be 0. Polynomial: V0 + V1 + V2 + V3 + V4 + Sum + V6 + V7 = 0 Code: void CCalc_nxp_checksumDlg::OnCalc() {  // chose bin file  CString sFilename;  CFileDialog dlg(TRUE);      // open with TRUE, save with FALSE  if(dlg.DoModal() == IDOK) {   sFilename = dlg.GetPathName();   // full path  }   // read 8 interrupt vectors  CFile file;  if(!file.Open(sFilename, CFile::modeRead)) { return; }  int data ;  BYTE str ;  for(int i=0; i8; i++) {   file.Read(str, 4);   data = *(int *)str;  }  file.Close();  // calc checksum  int sum = 0;  for(i=0; i8; i++) {   if(i != 5) { sum += data ; }  }  sum = 0 - sum;  BYTE checksum ;  int *sum_ptr = ∑  BYTE *ptr = (BYTE *)sum_ptr;  for(i=0; i4; i++) {   checksum = *ptr;   ptr++;  }  CString sResult;  sResult.Format("%X %X %X %X", checksum , checksum , checksum , checksum );  GetDlgItem(IDC_EDIT1)-SetWindowText(sResult); } Conclusion: In current most IDE, the interrupt vector checksum can be calculated. But for the other old IDE, we have to calculate the checksum by ourselves. Written by Allen in Shenzhen 2010.12.04