MSP430FR2522: MSP430FR2422 porting to MSP430FR2522, ADC issue

Hi Stanley,

Can you tell me more about how you configured the devices? It would also help if you provided the rest of the code.

Thanks,

Urica Wang

Hi Urica,

This is how I configure the ADC. And below you can also find the interrupt routine.

Then on the main loop I call StartADCConversion whenever I need a reading from the specific channel. I allow around 5-30ms between readings.

void StartADCConversion(adc_input_vrbls_t * channel)
{
    //Configure Memory Buffer
    /*
     * Base Address for the ADC Module
     * Input A6 as first multiple sample channel
     * Use positive reference of AVcc
     * Use negative reference of AVss
     */
    ADC_configureMemory(ADC_BASE,
            channel->AdcChannel,
            ADC_VREFPOS_AVCC,
            ADC_VREFNEG_AVSS);

    adcReading = channel;

    //Enable and Start the conversion
    //in Multiple-Channels, Single Conversion Mode
    ADC_startConversion(ADC_BASE,
                        ADC_SINGLECHANNEL);

    _BIS_SR(GIE);
}

void configADC(void)
{
    //Initialize the ADC Module
    /*
     * Base Address for the ADC Module
     * Use internal ADC bit as sample/hold signal to start conversion
     * USE MODOSC 5MHZ Digital Oscillator as clock source
     * Use default clock divider of 1
     */
    ADC_init(ADC_BASE,
        ADC_SAMPLEHOLDSOURCE_SC,
        ADC_CLOCKSOURCE_ADCOSC,
        ADC_CLOCKDIVIDER_1);

    ADC_enable(ADC_BASE);

    /*
     * Base Address for the ADC Module
     * Sample/hold for 16 clock cycles
     * Enable Multiple Sampling
     */
    ADC_setupSamplingTimer(ADC_BASE,
            ADC_CYCLEHOLD_16_CYCLES,
            ADC_MULTIPLESAMPLESENABLE);

    ADC_clearInterrupt(ADC_BASE,
            ADC_COMPLETED_INTERRUPT);

    //Enable Memory Buffer interrupt
    ADC_enableInterrupt(ADC_BASE,
            ADC_COMPLETED_INTERRUPT);

}


//ADC10 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(ADC_VECTOR)))
#endif
void ADC_ISR (void)
{
    switch (__even_in_range(ADCIV,12)){
        case  0: break; //No interrupt
        case  2: break; //conversion result overflow
        case  4: break; //conversion time overflow
        case  6: break; //ADC10HI
        case  8: break; //ADC10LO
        case 10: break; //ADC10IN
        case 12:        //ADC10IFG0
            adcReading->Voltage = ADC_getResults(ADC_BASE);
            adcReading->ReadingReady = true;
          break;
        default: break;
    }
}