CCS/MSP430FR2355: ADC triggered by TimerB CCP1

 ADCCTL1 = ADCSHP | ADCSHS_2 | ADCCONSEQ_2;

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//******************************************************************************
//  MSP430FR235x Demo - ADC, Window Comparator, 2.5V ref, Timer trigger, DCO
//
//  Description: This example works on Repeat-Single-Channel Mode.
//  A1 is sampled in every 0.5s using the TB1.1 trigger.
//  Window comparator is used to generate interrupts to indicate when the input
//  voltage goes above the High_Threshold or below the Low_Threshold or
//  is inbetween the high and low thresholds. Timer_B1 is used as an interval
//  timer used to control the LED at P1.2 to toggle slow/fast or turn off
//  according to the ADC Hi/Lo/IN interupts.
//  ACLK = XT1 = 32768Hz, MCLK = SMCLK = default DCODIV ~1MHz.
//
//               MSP430FR2355
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//       >---|P1.1/A1     P1.2 |--> LED
//
//
//   Cash Hao
//   Texas Instruments Inc.
//   November 2016
//   Built with IAR Embedded Workbench v6.50.0 & Code Composer Studio v6.2.0
//******************************************************************************
#include <msp430.h>

#define    High_Threshold    3277                        //~2V
#define    Low_Threshold     819                         //~0.5V

unsigned int SlowToggle_Period = 20000-1;
unsigned int FastToggle_Period = 1000-1;

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

    P1DIR |= BIT2;                                      // Set P1.2 output direction
    P1OUT &= ~BIT2;                                     // Clear P1.2

    // Configure ADC A1 pin
    P1SEL0 |= BIT1;
    P1SEL1 |= BIT1;

    // Disable the GPIO power-on default high-impedance mode to activate
    // previously configured port settings
    PM5CTL0 &= ~LOCKLPM5;

    // Configure XT1 oscillator
    P2SEL1 |= BIT6 | BIT7;                              // P2.6~P2.7: crystal pins
    CSCTL4 = SELA__XT1CLK;                              // Set ACLK = XT1; MCLK = SMCLK = DCO
    do
    {
        CSCTL7 &= ~(XT1OFFG | DCOFFG);                  // Clear XT1 and DCO fault flag
        SFRIFG1 &= ~OFIFG;
    }while (SFRIFG1 & OFIFG);                           // Test oscillator fault flag


    // Configure ADC;
    ADCCTL0 = ADCSHT_2 | ADCMSC | ADCON;                // ADCON
    ADCCTL1 = ADCSHP | ADCSHS_2 | ADCCONSEQ_2;          // Rpt single ch; TB1.1 trigger
    ADCCTL2 = ADCRES_2;                                 // 12-bit conversion results
    ADCMCTL0 = ADCINCH_1 | ADCSREF_1;                   // Vref 2.5v, A1
    ADCHI = High_Threshold;                             // Window Comparator Hi-threshold
    ADCLO = Low_Threshold;                              // Window Comparator Lo-threshold
    ADCIE |= ADCHIIE | ADCLOIE | ADCINIE;               // Enable ADC conv complete interrupt

    // Configure reference
    PMMCTL0_H = PMMPW_H;                                // Unlock the PMM registers
    PMMCTL2 |= INTREFEN | REFVSEL_2;                    // Enable internal 2.5V reference
    __delay_cycles(400);                                // Delay for reference settling

    // Configure TB0 period-timer
    TB0CCTL0 = CCIE;                                    // CCR0 interrupt enabled
    TB0CTL = TBSSEL_1 | TBCLR;                          // ACLK, clear TBR

    // Configure ADC timer trigger TB1.1
    TB1CCR0 = 16384-1;                                  // PWM Period
    TB1CCR1 = 8192-1;                                   // Duty cycle TB1.1
    TB1CCTL1 = OUTMOD_4;                                // TB1CCR1 toggle
    TB1CTL = TBSSEL_1 | MC_1 | TBCLR;                   // ACLK, up mode
    ADCCTL0 |= ADCENC;                                  // Enable conversion

    __bis_SR_register(LPM3_bits | GIE);                 // Enter LPM3 w/ interrupts
    __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:                            // ADCHI; A1> 2V
            ADCIFG &= ~ADCHIIFG;                        // Clear interrupt flag
            TB0CTL &= ~MC_1;                            // Turn off Timer
            TB0CCR0 = FastToggle_Period;                // Set Timer Period for fast LED toggle
            TB0CTL |= MC_1;
            break;
        case ADCIV_ADCLOIFG:                            // ADCLO; A1 < 0.5V
            ADCIFG &= ~ADCLOIFG;                        // Clear interrupt flag
            TB0CTL &= ~MC_1;                            // Turn off Timer
             TB0CCR0 = SlowToggle_Period;               // Set Timer Period for slow LED toggle
            TB0CTL |= MC_1;
            break;
        case ADCIV_ADCINIFG:                            // ADCIN; 0.5V < A1 < 2V
            ADCIFG &= ~ADCINIFG;                        // Clear interrupt flag
            TB0CTL &= ~MC_1;                            // Turn off Timer
            P1OUT &= ~BIT2;
            break;
        case ADCIV_ADCIFG:
            break;
        default:
            break;
    }
}

// Timer0 B0 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMER0_B0_VECTOR
__interrupt void TIMER0_B0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER0_B0_VECTOR))) TIMER0_B0_ISR (void)
#else
#error Compiler not supported!
#endif
{
  P1OUT ^= BIT2;                                        // Toggle LED P1.2
}