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Printf in Serial Viewer

Raja D

I'm trying to print the printf statements in the ITM viewer(Serial Viewer). I have the following code in the fputc function. Basically I followed all the instructions in the "Using the ITM Viewer".

  if (DEMCR & TRCENA) {
    while (ITM_Port32(0) == 0);
    ITM_Port8(0) = ch;
  }

But still i couldn't print anything on the ITM Viewer. The program kind of hand in the following line.

  while (ITM_Port32(0) == 0);


Am I missing something in the settings.?
Any suggestions are appreciated.
Thanks