msp430fr413x_adc10_16.c

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//******************************************************************************
//  MSP430FR413x Demo - ADC, Sample A12 Temp and Convert to oC and oF
//
//  Description: This example works on Single-Channel Single-Conversion Mode.
//  A single sample is made on A12 (temperature) with reference to
//  internal 1.5V Vref. Software sets ADCSC to start sample and conversion
//  periodically
//  - ADCSC automatically cleared at EOC. ADC internal oscillator times
//  sample and conversion. In Mainloop MSP430 waits in LPM0 to save power until
//  ADC conversion complete, ADC12_ISR will convert the result to oC and oF
//
//  ACLK = default REFO ~32768Hz, MCLK = SMCLK = default DCODIV ~1MHz.
//
//  Uncalibrated temperature measured from device to device will vary due to
//  slope and offset variance from device to device - please see datasheet.
//
//  This code example show how to use the TLV calibrated data to measure temperature.
//
//
//                MSP430FR4133
//             -----------------
//         /|\|                 |
//          | |                 |
//          --|RST              |
//            |                 |
//        >---|A12(temp)        |
//
//
//  Kathryn Adamsky
//  Texas Instruments Inc.
//  June 2016 (Updated) | Sep 2014 (Created)
//  Built with IAR Embedded Workbench v6.10 & Code Composer Studio v6.1.3
//******************************************************************************
#include <msp430.h>

#define CALADC_15V_30C  *((unsigned int *)0x1A1A)                 // Temperature Sensor Calibration-30 C
                                                                  // See device datasheet for TLV table memory mapping
#define CALADC_15V_85C  *((unsigned int *)0x1A1C)                 // Temperature Sensor Calibration-85 C

float temp;
float IntDegF;
float IntDegC;

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;                                     // Stop WDT

    PM5CTL0 &= ~LOCKLPM5;                                         // Disable high-impedance mode

    TA0CCTL0 |= CCIE;                                             // TACCR0 interrupt enabled
    TA0CCR0 = 65535;
    TA0CTL = TASSEL__ACLK | MC__UP;                               // ACLK, UP mode

    // Configure ADC - Pulse sample mode; ADCSC trigger
    ADCCTL0 |= ADCSHT_8 | ADCON;                                  // ADC ON,temperature sample period>30us
    ADCCTL1 |= ADCSHP;                                            // s/w trig, single ch/conv, MODOSC
    ADCCTL2 |= ADCRES;                                            // 10-bit conversion results
    ADCMCTL0 |= ADCSREF_1 | ADCINCH_12;                           // ADC input ch A12 => temp sense
    ADCIE |=ADCIE0;                                               // Enable the Interrupt request for a completed ADC_B conversion

    // Configure reference
    PMMCTL0_H = PMMPW_H;                                          // Unlock the PMM registers
    PMMCTL2 |= INTREFEN | TSENSOREN;                              // Enable internal reference and temperature sensor
    __delay_cycles(400);                                          // Delay for reference settling

    __bis_SR_register(LPM0_bits | GIE);                           // LPM3 with interrupts enabled
    __no_operation();                                             // Only for debugger
}



// ADC interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC_VECTOR
__interrupt void ADC_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(ADC_VECTOR))) ADC_ISR (void)
#else
#error Compiler not supported!
#endif
{
    switch(__even_in_range(ADCIV,ADCIV_ADCIFG))
    {
        case ADCIV_NONE:
            break;
        case ADCIV_ADCOVIFG:
            break;
        case ADCIV_ADCTOVIFG:
            break;
        case ADCIV_ADCHIIFG:
            break;
        case ADCIV_ADCLOIFG:
            break;
        case ADCIV_ADCINIFG:
            break;
        case ADCIV_ADCIFG:
            temp = ADCMEM0;
            // Temperature in Celsius
            IntDegC = (temp-CALADC_15V_30C)*(85-30)/(CALADC_15V_85C-CALADC_15V_30C)+30;

            // Temperature in Fahrenheit
            IntDegF = 9*IntDegC/5+32;

            break;
        default:
            break;
    }
}

// Timer A0 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER0_A0_VECTOR))) Timer_A (void)
#else
#error Compiler not supported!
#endif
{
    ADCCTL0 |= ADCENC | ADCSC;                                    // Sampling and conversion start
}