CCS/MSP430FR6922: Battery monitoring with Battmap

Part Number: MSP430FR6922

Tool/software: Code Composer Studio

Hello,

I'm trying to monitor the AVCC/2 value on my MSP430FR6922 with the ADC12BATMAP bit. The ADC is always giving me 4095 as a result, with 2.0V or 2.5V for internal reference. 

Here is my init function for ADC12 : 

void ADC12_init(void)
{
    /* Select internal ref = 2.0V */
    while (Ref_A_isRefGenBusy(ADC12_B_BASE)) ;
    Ref_A_setReferenceVoltage(ADC12_B_BASE, REF_A_VREF2_5V);

    ADC12_B_configureMemoryParam configureMemoryParam = {0};
    configureMemoryParam.memoryBufferControlIndex = ADC12_B_MEMORY_0;
    configureMemoryParam.inputSourceSelect = ADC12_B_INPUT_BATMAP;
    configureMemoryParam.refVoltageSourceSelect = ADC12_B_VREFPOS_INTBUF_VREFNEG_VSS;
    configureMemoryParam.endOfSequence = ADC12_B_ENDOFSEQUENCE;
    configureMemoryParam.windowComparatorSelect = ADC12_B_WINDOW_COMPARATOR_DISABLE;
    configureMemoryParam.differentialModeSelect = ADC12_B_DIFFERENTIAL_MODE_DISABLE;

    ADC12_B_initParam initParam = {0};

    initParam.sampleHoldSignalSourceSelect = ADC12_B_SAMPLEHOLDSOURCE_SC;
    initParam.clockSourceSelect = ADC12_B_CLOCKSOURCE_ADC12OSC;
    initParam.clockSourceDivider = ADC12_B_CLOCKDIVIDER_1;
    initParam.clockSourcePredivider = ADC12_B_CLOCKPREDIVIDER__1;
    initParam.internalChannelMap = ADC12_B_BATTMAP;

    /* Turn on Reference Voltage */
    Ref_A_enableReferenceVoltage(ADC12_B_BASE);

    /* Enable memory buffer */
    ADC12_B_configureMemory(ADC12_B_BASE, &configureMemoryParam);

    /* Enable the ADC12B module */
    ADC12_B_init(ADC12_B_BASE, &initParam);
    ADC12_B_enable(ADC12_B_BASE);

    //Enable memory buffer 0 interrupt
    ADC12_B_clearInterrupt(ADC12_B_BASE, 0, ADC12_B_IFG0);
    ADC12_B_enableInterrupt(ADC12_B_BASE, ADC12_B_IE0, 0, 0);

    ADC12_B_setupSamplingTimer(ADC12_B_BASE,
                               ADC12_B_CYCLEHOLD_16_CYCLES,
                               ADC12_B_CYCLEHOLD_16_CYCLES,
                               ADC12_B_MULTIPLESAMPLESDISABLE);
}

And here the call :

    /* Start ADC */
    ADC12_init();

#if(1)
    __enable_interrupt();

    while(1)
    {
        __delay_cycles(10000);

        ADC12_B_clearInterrupt(ADC12_B_BASE, 0, ADC12_B_IFG0);
        ADC12_B_startConversion(ADC12_B_BASE, ADC12_B_MEMORY_0, ADC12_B_SINGLECHANNEL);

        __bis_SR_register(LPM0_bits + GIE);
        __no_operation();
    }
#endif

I use the breakpoint inside the interrupt : 

#pragma vector=ADC12_VECTOR
__interrupt void ADC12_ISR(void)
{
    volatile uint16 ADC = ADC12_B_getResults(ADC12_B_BASE, ADC12_B_MEMORY_0); 

    __no_operation();
    __bic_SR_register_on_exit(LPM0_bits);
}

Thanks in advance !