MSPM0C1104: Repeatability of internal temperature reading

Hi Goran,

As I suspected, the noise seems to be present when the CPU is operating.

As and example, I changed my setup to use power policy STOP0 and use a timer, running from LFOSC, to generate an event (which starts the ADC sample/conversion) every 20ms.  Don't use timer interrupts as that will force the CPU to wake. When the ADC is done it generates an interrupt which wakes the CPU to read the data, send data out the UART, then CPU goes back into STOP0.

void send(uint8_t* buffer, uint8_t size)
{
    uint8_t i;

    for (i = 0; i < size; i++)
    {
        DL_UART_Main_transmitDataBlocking(UART_0_INST, buffer[i]);
    }
}

int main(void)
{
    SYSCFG_DL_init();

    DL_SYSCTL_setPowerPolicyRUN0SLEEP0();

    NVIC_EnableIRQ(ADC12_0_INST_INT_IRQN);
    gCheckADC = false;

    calibration = (uint16_t)0x41c4003c;

    while (1) {

        DL_ADC12_enableConversions(ADC12_0_INST);

        __WFI();

        if(gCheckADC == true)
        {

            gAdcResult = DL_ADC12_getMemResult(ADC12_0_INST, DL_ADC12_MEM_IDX_0);
            sample++;
            len = sprintf((char*)asciiBuffer, "%d, %d\r\n", sample, gAdcResult);
            send(asciiBuffer,len);
            gCheckADC = false;
        }
    }
}

void ADC12_0_INST_IRQHandler(void)
{
    switch (DL_ADC12_getPendingInterrupt(ADC12_0_INST)) {
        case DL_ADC12_IIDX_MEM0_RESULT_LOADED:
            gCheckADC = true;
            break;
        default:
            break;
    }
}