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Where is the explanation document for First Order Filter in the MotorWare Lib

Frank SD Yang
Prodigy 100 points
Other Parts Discussed in Thread: MOTORWARE, TMS320F28069M

Hi,

I used the first order filter in the MotorWare Lib as following:

MCU: TMS320F28069M

Library: MotorWare 1.01.00.13

in configuration code

// Sine
 FILTER_FO_setDenCoeffs(obj->filterFoHandleA0,_IQ(0.01));
 FILTER_FO_setInitialConditions(obj->filterFoHandleA0, _IQ(0.0), _IQ(0.0));
 FILTER_FO_setNumCoeffs(obj->filterFoHandleA0, _IQ(1.0), _IQ(1.0));

in using adc code

A0value = FILTER_FO_run(obj->filterFoHandleA0, A0value);

I don't understand how to set parameter values, because I didn't find the intruction manual for Filter in MotorWare Lib.

I just put the each value by testing without understanding.

Where is the explanation document for First Order Filter in the MotorWare?

I want to understand how to tune the values with calculation like 1MHz low pass filter.

  • 0
    TI__Guru** 118000 points
    in latest release MotorWare 15 there are some new simplified projects which show you all the CTRL code. You can see how this is set-up

    // initialize and configure offsets using filters
    {
    uint16_t cnt = 0;
    _iq b0 = _IQ(gUserParams.offsetPole_rps/(float_t)gUserParams.ctrlFreq_Hz);
    _iq a1 = (b0 - _IQ(1.0));
    _iq b1 = _IQ(0.0);

    for(cnt=0;cnt<6;cnt++)
    {
    filterHandle[cnt] = FILTER_FO_init(&filter[cnt],sizeof(filter[0]));
    FILTER_FO_setDenCoeffs(filterHandle[cnt],a1);
    FILTER_FO_setNumCoeffs(filterHandle[cnt],b0,b1);
    FILTER_FO_setInitialConditions(filterHandle[cnt],_IQ(0.0),_IQ(0.0));
    }

    gMotorVars.Flag_enableOffsetcalc = false;
    }