TMS570LC4357: ADC reading not consistent

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Hi,

I am using the PWMB event to trigger ADC readings, and I am having some question/issues.
The configuration I am using is the following (ADC/PWM example from HalCoGen):



I wrote this simple script to check the order of the data inside the data array after using the adcGetData function.

int main(void)
{
/* USER CODE BEGIN (3) */

    /* enable irq interrupt in */
    _enable_IRQ_interrupt_();

    adcInit();
    etpwmInit();
    adcStartConversion(adcREG1, adcGROUP0);
    etpwmStartTBCLK();

    while(1)
    {

        adcData_t data[16];
        for(volatile uint8_t ii; ii < 16; ii++)
        {
            data[ii].id = 0;
            data[ii].value = 0;
        }
        uint32 count;
        uint16 cmpA;

        count = adcGetData(adcREG1, adcGROUP0, data);

        volatile uint8_t tmp_brkpnt = 0;

        volatile uint32_t id = data[0].id;

        if(15 == id || 14 == id || 13 == id)
        {
            tmp_brkpnt = 1;
        }
    }

    while(1);

/* USER CODE END */

    return 0;
}

The data order inside the array seems to be inconsistent, as you can see on the following pictures:





Is the order not supposed to stay the same ? And is it normal to have two ADC readings of the same channel in a row ?

Also, it seems like I have to read the ADC buffer in order to get ADC readings. Indeed, when I am stopping the program in debug mode, if I change the input voltage of the pin, I need to read the ADC buffer twice in order to see the updated voltage.

Thank you !