CCS/TMS320F28062: ADC didn't work when it was configured to be triggered by CPU timer0.

Thanks for your reply.

Fallowing are My timer configuration & ISR of ADC INT2:

InitCpuTimers();
ConfigCpuTimer(&CpuTimer0, 90, ANALOG_SAMPLE_PERIOD);///< ANALOG_SAMPLE_PERIOD = 1000

void cpu_timer0_isr(void)///< PIE1.7
{
	CpuTimer0.InterruptCount++;
	if(CpuTimer0.InterruptCount >= CFG_PERIOD_ANALOGS_TO_CONTROL)
	{
		CpuTimer0.InterruptCount = 0;
	}
	AdcRegs.ADCSOCFRC1.all = 0x1FF8;///< SOC3->SOC12


	CpuTimer0Regs.TCR.bit.TIF = 1; ///< Clear interruption flag,Write 1 clear.
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

ISR of ADCINT2:

void ADCInt2ISR(void)///< PIE1.2
{
	g_AnalogsStruc.m_L3N.m_ValADC = (short)AdcResult.ADCRESULT3 - (short)AdcResult.ADCRESULT5;   ///< Line voltage:WU
	g_AnalogsStruc.m_L2N.m_ValADC = (short)AdcResult.ADCRESULT4 - (short)AdcResult.ADCRESULT3;   ///< Line voltage:VW
	g_AnalogsStruc.m_L1N.m_ValADC = (short)AdcResult.ADCRESULT5 - (short)AdcResult.ADCRESULT4;   ///< Line voltage:UV
	g_AnalogsStruc.m_DCBus.m_ValADC = AdcResult.ADCRESULT6 + DCBUS_V_COMPST;
	g_AnalogsStruc.m_MotorStallCurrent.m_ValADC = AdcResult.ADCRESULT7;

	g_AnalogsStruc.m_ChargeTmpt.m_ValADC = AdcResult.ADCRESULT8;
	g_AnalogsStruc.m_SinkTmpt.m_ValADC = AdcResult.ADCRESULT9;
	g_AnalogsStruc.m_AirTmpt.m_ValADC = AdcResult.ADCRESULT10;
	g_AnalogsStruc.m_MotorTmpt.m_ValADC = AdcResult.ADCRESULT11;
	g_AnalogsStruc.m_IGBTTmpt.m_ValADC = AdcResult.ADCRESULT12;

	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_L3N);
	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_L2N);
	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_L1N);
	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_DCBus);
	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_MotorStallCurrent);

	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_ChargeTmpt);
	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_SinkTmpt);
	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_AirTmpt);
	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_MotorTmpt);
	DF1st(&g_DF1stAnalog,&g_AnalogsStruc.m_IGBTTmpt);


	AdcRegs.ADCINTFLGCLR.bit.ADCINT2 = 1;
	AdcRegs.ADCINTOVFCLR.bit.ADCINT2 = 1;
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE

}

void cpu_timer0_isr(void)///< PIE1.7 { CpuTimer0.InterruptCount++; if(CpuTimer0.InterruptCount >= CFG_PERIOD_ANALOGS_TO_CONTROL) { CpuTimer0.InterruptCount = 0; } AdcRegs.ADCSOCFRC1.all = 0x1FF8;///< SOC3->SOC12 CpuTimer0Regs.TCR.bit.TIF = 1; ///< Clear interruption flag,Write 1 clear. PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; }

Hi,

I think the problem is because you are acknowledging the Group 1 interrupt in both CPU Timer & ADCINT ISR. Do you need both the ISRs in your application? You can disable the timer 0 interrupt at PIE level and use the timer 0 as trigger for ADC or try using timer 1 or timer 2 as ADC triggers.

Thanks

Vasudha

Xing,

You probably do not want to perform a software SOC force in your TIMER ISR:

AdcRegs.ADCSOCFRC1.all = 0x1FF8;///< SOC3->SOC12

The TIMER itself will generate a trigger as configured.  You are almost certainly creating an overflow by triggering the SOCs again.

It may be a good idea to go back to the adc_soc example from C2000Ware or controlSUITE to make sure that your ADC hardware conversions are working with EPWM triggers.  Then change the EPWM trigger to TIMER trigger to make sure that your software configuration for TIMER triggers is good.

-Tommy

Tommy,
The ADCSOCFRC1 trigger was added after i had found that CPU timer0 didn't trigger ADC conversion.
Removing configuration for ONESHOT mode can solve my problem.But i don't know why!

Xing,

I am unable to conclude why removing ONESHOT would make everything work.  In my opinion, there are too many variables at play here.  For example, double-triggering the ADC can result in strange behavior.

If you wish to fully debug the behavior, you will need to simplify the code and make sure that every register setting is producing the desired behavior.  This includes TIMER0 successfully triggering the ADC.

-Tommy

Xing,

You can start with the adc_soc example and proceed as below.  Make sure that you clear the interrupt flags by performing a CPU reset or power-down between steps.

1. Build & run unmodified example with breakpoint set in ISR on instruction "ConversionCount = 0;"  This should behave as expected with a breakpoint halt every 10 EPWM triggers.
2. Remove the EPWM configuration.  Build & run with the same ADC ISR breakpoint.  This run should never halt because the EPWM is not issuing ADC triggers.
3. Change the ADC TRIGSEL settings from EPWM (5) to CPU TIMER (1).  The TIMER is already enabled.  Build & run with the same ADC ISR breakpoint.  This run should halt every 10 TIMER triggers.
4. Enable the TIMER interrupt by setting TCR[TIE] and PIEIER1[INTx7].  Add in a TIMER ISR that does nothing but set PIEACK[PIEACK_GROUP1].  Set a breakpoint in the TIMER ISR and at the normal ADC ISR breakpoint.  Build & run.  This run should halt at the TIMER ISR 10 times for every ADC ISR halt.

-Tommy