[参考译文] MSP430FR2522：MSP430FR2422移植到 MSP430FR2522、ADC 问题

您好、Urica、

这就是我配置 ADC 的方法。 在下面、您还可以找到中断例程。

然后、在主循环中、每当我需要从特定通道读取数据时、我都会调用 StartADCConversion。 我允许读数之间的间隔时间大约为5-30ms。

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;
    }
}