TM4C123GH6PM: TM4C123 ADC analog read from two ports, comments requested.

Part Number: TM4C123GH6PM

Hello,

I need to read PD2 and PD3 as analog inputs. So I have done:

uint32_t fifo_left[4];
uint32_t fifo_right[4];

void init_adc() {

    // enable adc0
    SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);

    // PD2, PD3
    GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_2 | GPIO_PIN_3);

    // configure two sequences
    ADCSequenceConfigure(ADC0_BASE, 1, ADC_TRIGGER_PROCESSOR, 0);
    ADCSequenceConfigure(ADC0_BASE, 2, ADC_TRIGGER_PROCESSOR, 1);

    // sequence 1 step configuration
    ADCSequenceStepConfigure(ADC0_BASE, 1, 0, ADC_CTL_CH4);
    ADCSequenceStepConfigure(ADC0_BASE, 1, 1, ADC_CTL_CH4);
    ADCSequenceStepConfigure(ADC0_BASE, 1, 2, ADC_CTL_CH4);
    ADCSequenceStepConfigure(ADC0_BASE, 1, 3, ADC_CTL_CH4 | ADC_CTL_IE | ADC_CTL_END);

    // sequence 2 step configuration
    ADCSequenceStepConfigure(ADC0_BASE, 2, 0, ADC_CTL_CH5);
    ADCSequenceStepConfigure(ADC0_BASE, 2, 1, ADC_CTL_CH5);
    ADCSequenceStepConfigure(ADC0_BASE, 2, 2, ADC_CTL_CH5);
    ADCSequenceStepConfigure(ADC0_BASE, 2, 3, ADC_CTL_CH5 | ADC_CTL_IE | ADC_CTL_END);

    // enable sequences
    ADCSequenceEnable(ADC0_BASE, 1);
    ADCSequenceEnable(ADC0_BASE, 2);

    // clear interrupt
    ADCIntClear(ADC0_BASE, 1);
    ADCIntClear(ADC0_BASE, 2);

}

and in the while loop:

        // trigger adc, wait for result, clear int, and get data to fifo
        ADCProcessorTrigger(ADC0_BASE, 1);
        while(!ADCIntStatus(ADC0_BASE, 1, false)) { }
        ADCIntClear(ADC0_BASE, 1);
        ADCSequenceDataGet(ADC0_BASE, 1, fifo_right);

        ADCProcessorTrigger(ADC0_BASE, 2);
        while(!ADCIntStatus(ADC0_BASE, 2, false)) { }
        ADCIntClear(ADC0_BASE, 2);
        ADCSequenceDataGet(ADC0_BASE, 2, fifo_left);

and it works. I am using two sequences (1 and 2) on ADC0, and sampling CH4 and CH5.

Here are my questions: Could I configure the steps of the sequence all at once? Like, read ch4 into fifo, and then end generating intterrupt?

And the second question: in the while loop, i trigger sequence 1, and then wait and then read. then for the sequence 2. could i trigger both sequences at the same time, or is there a better way of doing it?

With best regards,

Can