TMS320F28027: uding ADCinA & ADCinB with Peripheral Drivers Library

Nicolas Boyer

Prodigy 140 points

Part Number: TMS320F28027

Hello, I try to use the ADC channels A and B using the Peripheral Driver Library.

I can manage to do it using the example In "Example_28020xAdcSoc" considering each conversion individually.

But I would like to use the possibility to convert A&B at the same time simultaneously.

I didn't found any example.

Here is my code for 2 conversion A1 and B1

    // Configure ADC
    //Note: Channel ADCINA4  will be double sampled to workaround the ADC 1st sample issue for rev0 silicon errata
    ADC_setIntPulseGenMode(myAdc, ADC_IntPulseGenMode_Prior);               //ADCINT1 trips after AdcResults latch
    ADC_enableInt(myAdc, ADC_IntNumber_1);                                  //Enabled ADCINT1
    ADC_setIntMode(myAdc, ADC_IntNumber_1, ADC_IntMode_ClearFlag);          //Disable ADCINT1 Continuous mode
    ADC_setIntSrc(myAdc, ADC_IntNumber_1, ADC_IntSrc_EOC2);                 //setup EOC2 to trigger ADCINT1 to fire
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_0, ADC_SocChanNumber_B1);    //set SOC0 channel select to ADCINB1
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_1, ADC_SocChanNumber_B1);    //set SOC1 channel select to ADCINB1
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_2, ADC_SocChanNumber_A1);    //set SOC2 channel select to ADCINA1
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_0, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_1, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_2, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_0, ADC_SocSampleWindow_7_cycles);   //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_1, ADC_SocSampleWindow_7_cycles);   //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_2, ADC_SocSampleWindow_7_cycles);   //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)

and here is my code trying to convert some channels simultaneously. But ADCinB are not sampled

    // Configure ADC
    //Note: Channel ADCINA0  will be double sampled to workaround the ADC 1st sample issue for rev0 silicon errata
    ADC_setIntPulseGenMode(myAdc, ADC_IntPulseGenMode_Prior);               //ADCINT1 trips after AdcResults latch
    ADC_enableInt(myAdc, ADC_IntNumber_1);                                  //Enabled ADCINT1
    ADC_setIntMode(myAdc, ADC_IntNumber_1, ADC_IntMode_ClearFlag);          //Disable ADCINT1 Continuous mode
    ADC_setIntSrc(myAdc, ADC_IntNumber_1, ADC_IntSrc_EOC7);                 //setup EOC2 to trigger ADCINT1 to fire *************

    ADC_setSocChanNumber (myAdc, ADC_SocNumber_0, ADC_SocChanNumber_A0);    				//set SOC0 channel select to ADCINA0 > RESULT0 DISCARDED
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_1, ADC_SocChanNumber_A0);    				//set SOC1 channel select to ADCINA0 > RESULT1
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_2, ADC_SocChanNumber_A1_and_B1_Together);    //set SOC2 channel select to ADCINA1 et B1 RESULT2&3
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_3, ADC_SocChanNumber_A2_and_B2_Together);    //set SOC1 channel select to ADCINA2 et B2 RESULT4&5
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_4, ADC_SocChanNumber_A3_and_B3_Together);    //set SOC2 channel select to ADCINA3 et B3 RESULT6&7
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_5, ADC_SocChanNumber_A5);    				//set SOC1 channel select to ADCINA5 RESULT8
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_6, ADC_SocChanNumber_A7_and_B7_Together);    //set SOC2 channel select to ADCINA7 et B7 RESULT9&10
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_7, ADC_SocChanNumber_B4);    				//set SOC1 channel select to ADCINB4 RESULT11

    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_0, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_1, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_2, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_3, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_4, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_5, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_6, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_7, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2

    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_0, ADC_SocSampleWindow_7_cycles);   //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_1, ADC_SocSampleWindow_7_cycles);   //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_2, ADC_SocSampleWindow_7_cycles);   //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_3, ADC_SocSampleWindow_7_cycles);   //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_4, ADC_SocSampleWindow_7_cycles);   //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_5, ADC_SocSampleWindow_7_cycles);   //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_6, ADC_SocSampleWindow_7_cycles);   //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_7, ADC_SocSampleWindow_7_cycles);   //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)

over 4 years ago

0 Nicolas Boyer over 4 years ago

Prodigy 140 points

Any advice would be welcome. Best Regards.

0 tlee over 4 years ago

TI__Guru 62975 points

Nicolas,

You can find details about the ADC operation in the TRM. The first piece of critical information is that the simultaneous sampling mode is configured through the ADCSAMPLEMODE register so you will need to use ADC_setSampleMode() where necessary.

Another point is that the simultaneous samples will occupy sequential ADCRESULTn registers so you will not want to configure the SOCs that map to the paired result register:

-Tommy

0 Nicolas Boyer over 4 years ago in reply to tlee

Prodigy 140 points

Hi Tommy,

thanks for the advice.

I modified the code now it works.

Best regards

// Configure ADC
    //Note: Channel ADCINA4  will be double sampled to workaround the ADC 1st sample issue for rev0 silicon errata
    ADC_setIntPulseGenMode(myAdc, ADC_IntPulseGenMode_Prior);               //ADCINT1 trips after AdcResults latch
    ADC_enableInt(myAdc, ADC_IntNumber_1);                                  //Enabled ADCINT1
    ADC_setIntMode(myAdc, ADC_IntNumber_1, ADC_IntMode_ClearFlag);          //Disable ADCINT1 Continuous mode
    ADC_setIntSrc(myAdc, ADC_IntNumber_1, ADC_IntSrc_EOC3);                 //setup EOC2 to trigger ADCINT1 to fire
    ADC_setSampleMode(myAdc, ADC_SampleMode_SOC2_and_SOC3_Together);
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_0, ADC_SocChanNumber_A1);    //set SOC0 channel select to ADCINB1
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_1, ADC_SocChanNumber_B1);    //set SOC1 channel select to ADCINB1
    ADC_setSocChanNumber (myAdc, ADC_SocNumber_2, ADC_SocChanNumber_A1_and_B1_Together);    //set SOC2 channel select to ADCINA1
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_0, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_1, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
    ADC_setSocTrigSrc(myAdc, ADC_SocNumber_2, ADC_SocTrigSrc_EPWM1_ADCSOCA);    //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_0, ADC_SocSampleWindow_7_cycles);   //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_1, ADC_SocSampleWindow_7_cycles);   //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_2, ADC_SocSampleWindow_7_cycles);   //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    ADC_setSocSampleWindow(myAdc, ADC_SocNumber_3, ADC_SocSampleWindow_7_cycles);   //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)

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TMS320F28027: uding ADCinA & ADCinB with Peripheral Drivers Library