CCS/CCSTUDIO-C2000: How to give filtered signal to PID controller as reference ?

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Ananda Hange

Replies: 7

Views: 114

Part Number: CCSTUDIO-C2000

Tool/software: Code Composer Studio

I need to give filtered signal to my pid1 controller as my reference rk. AdcBufFiltered is my filtered signal.i'm using CCSv6.LPF.c

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Ananda Hange

• Feb 14, 2019 8:18 AM
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7 Replies

• Guru 13285 points

  

  John Westmoreland43

  

  • Feb 14, 2019 9:01 AM

  Hello Ananda,
  
  You should take a look at the DCL - Digital Control Library - www.ti.com/.../C2000-DIGITAL-CONTROL-LIBRARY .
  
  HTH,
  John W.

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• Prodigy 40 points

  

  Ananda Hange

  

  • Feb 14, 2019 10:05 AM

  In reply to John Westmoreland43:

  My filtered signal is in the array format of length 50.And i want that signal convert into float rk ,which is my reference to pid. I can't write rk=AdcBufFiltered[index]. then rk is choose any value from the array.how to resolve that problem.

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• Mastermind 20505 points

  

  Richard Poley

  

  • Feb 14, 2019 1:20 PM

  In reply to Ananda Hange:

  It looks like the filtered signal is in IQ format, so you can use the IQ to float conversion from that library:
  
  rk=_IQtoF(AdcBufFiltered[index]);
  
  You should also typecast the ADC results to float. Your first assignment, the current sensor reading, would look like this:
  
  I_sensor_FC =(float) SampleTable[i] * 7.326007326e-4 - IDC_offset;
  
  On last thing; where you are assigning float constants it's better to place an 'f' at the end to make it unambiguous to the compiler. For example:
  
  float IDC_offset=0.0f, ...
  
  Regards,
  
  Richard

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• Prodigy 40 points

  

  Ananda Hange

  

  • Feb 14, 2019 2:43 PM

  In reply to Richard Poley:

  Filter.cLPF2.cLPF2.cIQmathLib.hwhen i use this line rk = _IQtoF(AdcBufFilter[index]); i got errors as follows,

  Description Resource Path Location Type

  unresolved symbol __IQ24toF, first referenced in ./LPF1.obj EV1 C/C++ Problem

  Description Resource Path Location Type

  <a href="file:/c:/ti/ccsv7/tools/compiler/dmed/HTML/10234.html">#10234-D</a>  unresolved symbols remain EV1 C/C++ Problem

  Description Resource Path Location Type

  #10010 errors encountered during linking; "EV1.out" not built EV1 C/C++ Problem

  I attached file LPF2.c which is main file and filter.c and IQmathlib.h file .

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  Richard Poley

  

  • Feb 14, 2019 2:58 PM

  In reply to Ananda Hange:

  It sounds like you haven't linked IQmath.lib. Check section 3.5 of the IQ math Quick Start guide.
  
  Which device are you using?
  
  Regards,
  
  Richard

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• Prodigy 40 points

  

  Ananda Hange

  

  • Feb 15, 2019 5:19 AM

  In reply to Richard Poley:

  Yeah I hadn't link that IQmath.lib .Even if i link that I got some new error as follows,

  Description Resource Path Location Type
  <a href="file:/c:/ti/ccsv7/tools/compiler/dmed/HTML/16008.html">#16008-D</a> file "../IQmath.lib<IQ24toF.obj>" specifies ISA revision "C2800", which is not compatible with ISA revision "C28FPU32" specified in a previous file or on the command line EV1 C/C++ Problem.

  I'm using Delfino f28335 of c2000 famiy.

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  Richard Poley

  

  • Feb 15, 2019 1:44 PM

  In reply to Ananda Hange:

  I think this is because you've built for the FPU32 but are linking the fixed point version of IQmath.  Try linking "IQmath_fpu32.lib" instead of "IQmath.lib".  Both are in the \lib sub-directory in C2000Ware.

  Regards,

  Richard

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