Part Number: TMS320F28035
Other Parts Discussed in Thread: CONTROLSUITE
Tool/software: Code Composer Studio
Hi,
I am wokring on following kits: www.ti.com/.../TMDSDOCK28035. I am developing a sine wave genration application and using a Example SolarMicroInv_F2803x from controlSUITE.
I have connected sine wave input and reference as per below adc register.
ChSel[4] = 1; // A1 - IGRID adc result 4
ChSel[5] = 1; // A1 - IGRID adc result 5
ChSel[6] = 9; // B1 - VGRID adc result 6
ChSel[7] = 7; // A7 - Ref_1.65V adc result 7
ChSel[8] = 5; // A5 - Ref_0.5V adc result 8
I can successfully read sine wave on this adc pine and can able to see in graph given in code compose studio ->Tools->Graph-> Dual time.
I want to calculate Vrms and input frequency using following given example code :
//TODO AC Measurements
//---------------------------------------------------------------------
// Grid Frequency Measurements
//---------------------------------------------------------------------
ACFreq_SysTicks = (ECap1Regs.CAP1 + ECap1Regs.CAP2 + ECap1Regs.CAP3
+ ECap1Regs.CAP4) << 3;
ACFreq = _IQ4div(_IQ4(CPU_FREQ), ACFreq_SysTicks);
if (ECap1Regs.TSCTR > ECAP_TimerMaxVal
|| (ECap1Regs.CAP1 > ECAP_TimerMaxVal)
|| (ECap1Regs.CAP2 > ECAP_TimerMaxVal)
|| (ECap1Regs.CAP3 > ECAP_TimerMaxVal)) {
ACFreq_SysTicks = 0;
ACFreq = 0;
}
if (ACFreq < _IQ4(GRID_MIN_FREQ))
UF_Flag = 1;
else
UF_Flag = 0;
if (ACFreq > _IQ4(GRID_MAX_FREQ))
OF_Flag = 1;
else
OF_Flag = 0;
MATH_EMAVG2_IQ_MACRO((_IQ24abs(inv_meas_vol_inst)), inv_emavg_vol,
_IQ24(0.0003));
Gui_Vavg = _IQ16mpy((int32)inv_emavg_vol>>8,_IQ16(AC_PEAK_SENSE));
if (Gui_Vavg < _IQ16(GRID_MIN_VRMS))
UV_Flag = 1;
else
UV_Flag = 0;
if (Gui_Vavg > _IQ16(GRID_MAX_VRMS))
OV_Flag = 1;
else
OV_Flag = 0;
if (UF_Flag == 0 && Gui_Vavg > _IQ16(40.0)) {
//Calculate RMS input voltage and input frequency
sine_mains.Iin = inv_meas_cur_inst >> 9;
sine_mains.Vin = inv_meas_vol_inst >> 9;
SINEANALYZER_DIFF_wPWR_IQ_MACRO(sine_mains);
VRMS = (sine_mains.Vrms) << 9;// Convert sine_mainsV.Vrms from Q15 to Q24 and save as VrectRMS
IRMS = (sine_mains.Irms) << 9;// Convert sine_mainsV.Irms from Q15 to Q24 and save as IrectRMS
PRMS = (sine_mains.Prms) << 9;// Convert sine_mainsV.Prms from Q15 to Q24 and save as PinRMS
Gui_Prms = (sine_mains.Prms * K_Prms) >> 15;
Gui_Irms = (sine_mains.Irms * K_Irms) >> 15;
Gui_Vrms = (sine_mains.Vrms * K_Vrms) >> 15;
/*if(Gui_Vrms<_IQ6(GRID_MIN_VRMS))
UV_Flag=1;
else
UV_Flag=0;
if(Gui_Vrms>_IQ6(GRID_MAX_VRMS))
OV_Flag=1;
else
OV_Flag=0;
*/
} else {
VRMS = 0;// Convert sine_mainsV.Vrms from Q15 to Q24 and save as VrectRMS
IRMS = 0;// Convert sine_mainsV.Irms from Q15 to Q24 and save as IrectRMS
PRMS = 0;// Convert sine_mainsV.Prms from Q15 to Q24 and save as PinRMS
Gui_Prms = 0;
Gui_Irms = 0;
Gui_Vrms = 0;
SINEANALYZER_DIFF_wPWR_IQ_init(&sine_mains);
sine_mains.Vin = 0;
sine_mains.Iin = 0;
sine_mains.SampleFreq = _IQ15(1000.0);
sine_mains.Threshold = _IQ15(0.1);
sine_mains.nsamplesMax=1000/UNIVERSAL_GRID_MIN_FREQ;
sine_mains.nsamplesMin=1000/UNIVERSAL_GRID_MAX_FREQ;
}
Gui_Vpv = _IQ20mpy(pv_meas_vol_avg>>4,_IQ20(PV_VOL_SENSE_MAX));
Gui_Ipv = _IQ20mpy(pv_meas_cur_avg>>4,_IQ20(PV_CURR_SENSE_MAX));
Gui_Vbus = _IQ20mpy(vbus_meas_avg>>4,_IQ20(VBUS_VOL_SENSE_MAX));
and initialization of capture
/**********************************************************/
/********************** ECAP INIT *************************/
/**********************************************************/
void InitECapture() {
ECap1Regs.ECEINT.all = 0x0000; // Disable all capture interrupts
ECap1Regs.ECCLR.all = 0xFFFF; // Clear all CAP interrupt flags
ECap1Regs.ECCTL1.bit.CAPLDEN = 0; // Disable CAP1-CAP4 register loads
ECap1Regs.ECCTL2.bit.TSCTRSTOP = 0; // Make sure the counter is stopped
// Configure peripheral registers
ECap1Regs.ECCTL2.bit.CONT_ONESHT = 0; // Operation in Continuous Mode
ECap1Regs.ECCTL2.bit.STOP_WRAP = 3; // Wrap after 4 events
ECap1Regs.ECCTL1.bit.CAP1POL = 1; // Falling edge
ECap1Regs.ECCTL1.bit.CAP2POL = 0; // Rising edge
ECap1Regs.ECCTL1.bit.CAP3POL = 1; // Falling edge
ECap1Regs.ECCTL1.bit.CAP4POL = 0; // Rising edge
ECap1Regs.ECCTL1.bit.CTRRST1 = 1; // Difference operation
ECap1Regs.ECCTL1.bit.CTRRST2 = 1; // Difference operation
ECap1Regs.ECCTL1.bit.CTRRST3 = 1; // Difference operation
ECap1Regs.ECCTL1.bit.CTRRST4 = 1; // Difference operation
ECap1Regs.ECCTL2.bit.SYNCI_EN = 0; // Enable sync in
ECap1Regs.ECCTL2.bit.SYNCO_SEL = 0; // Pass through
ECap1Regs.ECCTL1.bit.CAPLDEN = 1; // Enable capture units
ECap1Regs.ECCTL2.bit.TSCTRSTOP = 1; // Start Counter
//ECap1Regs.ECCTL2.bit.REARM = 1; // arm one-shot
ECap1Regs.ECCTL1.bit.CAPLDEN = 1; // Enable CAP1-CAP4 register loads
// ECap1Regs.ECEINT.bit.CEVT4 = 1; // 4 events = interrupt
}
I want to get value of vrms and ac input frequency but not getting value of following variable.
ACFreq_SysTicks,
ACFreq
VRMS
Gui_Vrms
Please help me to get AcFreq and VRMS value in Kits.
Do I need to do other connection to get value of AcFreq and VRMS.
Thanks,
Jignesh Patel
