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fix mystery glitches in CCS NCO functions for 16f1509

 
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asmboy



Joined: 20 Nov 2007
Posts: 2116
Location: albany ny

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fix mystery glitches in CCS NCO functions for 16f1509
PostPosted: Fri Jul 11, 2014 9:25 am     Reply with quote

I found that when jamming new frequencies into the NCO using the CCS function that there was frequent glitching of my pulse train.
This is a function that appears to correct the problem.
( NCO used for stepper motor pacing - and the problem
could be HEARD before it was seen )

Code:

void setNCOfreq(unsigned int16 pfreq){
    // bank nine page 31 of data sheet
    STATIC int Psetupok;
    #WORD ncoinc=0x49B

  // detect  STOP CMD
  if (!PFreq) {
       setup_nco(NCO_DISABLED|NCO_FIXED_DUTY_MODE|NCO_CLOCK_FOSC,0);
       Psetupok=0;
  }
  else {
      if(0==psetupok){
    setup_nco(NCO_ENABLED|NCO_OUTPUT|NCO_FIXED_DUTY_MODE|NCO_CLOCK_FOSC,pfreq);
        Psetupok=1;
      } // avoid glitches induced when NCO is already generating
      else ncoinc=pfreq;
  }
}
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