timer_d_ex2_overflowISR.c

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//******************************************************************************
//  MSP430F51x2 Demo - TimerD0, Toggle P1.0, Overflow ISR, DCO SMCLK
//
//  Description: Toggle P1.0 using software and TimerD0 overflow ISR.
//  In this example an ISR triggers when TD overflows. Inside the TD
//  overflow ISR P1.0 is toggled. Toggle rate is approximatlely 16Hz.
//  Proper use of the TDIV interrupt vector generator is demonstrated.
//  ACLK = n/a, MCLK = SMCLK = TDCLK = default DCO ~1.045MHz
//
//           MSP430F51x2
//         ---------------
//     /|\|               |
//      | |               |
//      --|RST            |
//        |               |
//        |           P1.0|-->LED
//
//******************************************************************************
#include "driverlib.h"
 
void main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    //Set P1.0 to output direction
    GPIO_setAsOutputPin(
            GPIO_PORT_P1,
            GPIO_PIN0
            );
 
    Timer_D_clearTimerInterrupt(TIMER_D0_BASE);
 
    Timer_D_initContinuousModeParam param = {0};
    param.clockSource = TIMER_D_CLOCKSOURCE_SMCLK;
    param.clockSourceDivider = TIMER_D_CLOCKSOURCE_DIVIDER_1;
    param.clockingMode = TIMER_D_CLOCKINGMODE_EXTERNAL_CLOCK;
    param.timerInterruptEnable_TDIE = TIMER_D_TDIE_INTERRUPT_ENABLE;
    param.timerClear = TIMER_D_DO_CLEAR;
    Timer_D_initContinuousMode(TIMER_D0_BASE, &param);
 
    Timer_D_startCounter(TIMER_D0_BASE,
            TIMER_D_CONTINUOUS_MODE
            );
 
    __bis_SR_register(LPM0_bits + GIE);       // Enter LPM0, enable interrupts
    __no_operation();                         // For debugger
}
 
// Timer0_D1 Interrupt Vector (TDIV) handler
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMER0_D1_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(TIMER0_D1_VECTOR)))
#endif
void TIMER0_D1_ISR(void)
{
    switch(__even_in_range(TD0IV,30))
    {
    case  0: break;                          // No interrupt
    case  2: break;                          // CCR1 not used
    case  4: break;                          // CCR2 not used
    case  6: break;                          // reserved
    case  8: break;                          // reserved
    case 10: break;                          // reserved
    case 12: break;                          // reserved
    case 14: break;
    case 16: // overflow
            GPIO_toggleOutputOnPin(
 
              GPIO_PORT_P1,
              GPIO_PIN0
              );
             break;
    case 18: break;                          // Clock fail low
    case 20: break;                          // Clock fail high
    case 22: break;                          // Hi-res freq locked
    case 24: break;                          // Hi-res freq unlocked
    case 26: break;                          // reserved
    case 28: break;                          // reserved
    case 30: break;                          // reserved
    default: break;
    }
}