TMS320F280049: SOC cannot trigger ADC

Brian Wang0

Expert 5530 points

Part Number: TMS320F280049

Hi team,

I am helping my customer debugging their S/W.

The cdoe is pretty simple, the use EPWM1 SOCA to trigger ADCA CH0.

Here is their PWM setting, and I can observe a SOCA flag in CCS:

    EPWM_disableADCTrigger(EPWM1_BASE, EPWM_SOC_A);
    EPWM_setADCTriggerSource(EPWM1_BASE, EPWM_SOC_A, EPWM_SOC_TBCTR_U_CMPA);
    EPWM_setADCTriggerEventPrescale(EPWM1_BASE, EPWM_SOC_A, 3);
    EPWM_enableADCTrigger(EPWM1_BASE, EPWM_SOC_A);

And here ADC SOC configuration. Everything seems right, but no SOC is triggered.

    ADC_setVREF(ADCA_BASE, ADC_REFERENCE_EXTERNAL, ADC_REFERENCE_3_3V);

    //
    // Set ADCCLK divider to /4
    //
    ADC_setPrescaler(ADCA_BASE, ADC_CLK_DIV_4_0);

    //
    // Set pulse positions to late
    //
    ADC_setInterruptPulseMode(ADCA_BASE, ADC_PULSE_END_OF_CONV);

    //
    // Power up the ADC and then delay for 1 ms
    //

    ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA,
                 ADC_CH_ADCIN0, 10);

    ADC_enableConverter(ADCA_BASE);
    DEVICE_DELAY_US(1000);

Regards,

Brian

over 6 years ago

0 Nima Eskandari over 6 years ago

TI__Guru 52070 points

Just to clarify, are you seeing the Flag for SOC trigger get set or not?

0 Brian Wang0 over 6 years ago in reply to Nima Eskandari

TI__Expert 5530 points

Hi Nima,

As you can see I the first picture, the PWM SOC flag is set. But the ADC flag is not

0 Nima Eskandari over 6 years ago in reply to Brian Wang0

TI__Guru 52070 points

Here is a working code I have,

There must be a minor change between the two causing this!

    #define ADC_EPWM    EPWM7_BASE

    //
    // Setup VREF as external as required by the temperature sensor. Note that
    // the refVoltage parameter has no effect in this case.
    //
    ADC_setVREF(ADCA_BASE, ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);

    //
    // Set ADCCLK divider to /4
    //
    ADC_setPrescaler(ADCA_BASE, ADC_CLK_DIV_4_0);

    //
    // Set pulse positions to late
    //
    ADC_setInterruptPulseMode(ADCA_BASE, ADC_PULSE_END_OF_CONV);

    //
    // Power up the ADC and then delay for 1 ms
    //
    ADC_enableConverter(ADCA_BASE);
    DEVICE_DELAY_US(1000);

    //
    // Disable SOCA
    //
    EPWM_disableADCTrigger(ADC_EPWM, EPWM_SOC_A);

    //
    // Configure the SOC to occur on the first up-count event
    //
    EPWM_setADCTriggerSource(ADC_EPWM, EPWM_SOC_A, EPWM_SOC_TBCTR_U_CMPA);
    EPWM_setADCTriggerEventPrescale(ADC_EPWM, EPWM_SOC_A, 1);

    //
    // Set the compare A value to 2048 and the period to 4096
    //
    EPWM_setCounterCompareValue(ADC_EPWM, EPWM_COUNTER_COMPARE_A, 500);
    EPWM_setTimeBasePeriod(ADC_EPWM, 1000);

    //
    // Freeze the counter
    //
    EPWM_setTimeBaseCounterMode(ADC_EPWM, EPWM_COUNTER_MODE_STOP_FREEZE);

    ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM7_SOCA,
                 ADC_CH_ADCIN5, 100);

    //
    // Set SOC0 to set the interrupt 1 flag. Enable the interrupt and make
    // sure its flag is cleared.
    //
    ADC_setInterruptSource(ADCA_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER0);

    ADC_enableInterrupt(ADCA_BASE, ADC_INT_NUMBER1);
    ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);


uint32_t num = 0;
__interrupt void adcA1ISR(void)
{
    //
    // Read the raw result
    //
    //Read value = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER0);

    //
    // Clear the interrupt flag and issue ACK
    //
    ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);
    Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP1);
}

0 Brian Wang0 over 6 years ago in reply to Nima Eskandari

TI__Expert 5530 points

Thanks Nima,

I would look into more details to see what is happening!

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049: SOC cannot trigger ADC