msp430fr413x_ta0_01.c

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 *                       MSP430 CODE EXAMPLE DISCLAIMER
 *
 * MSP430 code examples are self-contained low-level programs that typically
 * demonstrate a single peripheral function or device feature in a highly
 * concise manner. For this the code may rely on the device's power-on default
 * register values and settings such as the clock configuration and care must
 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
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//******************************************************************************
//  MSP430FR413x Demo - Timer0_A3, Toggle P1.0, CCR0 Count Mode ISR, DCO SMCLK
//
//  Description: Toggle P1.0 using software and TA_0 ISR. Timer0_A is
//  configured for continuous mode, thus the timer overflows when TAR counts
//  to CCR0. In this example, CCR0 is loaded with 50000.
//  ACLK = n/a, MCLK = SMCLK = TACLK = default DCO = ~1MHz
//
//           MSP430FR4133
//         ---------------
//     /|\|               |
//      | |               |
//      --|RST            |
//        |               |
//        |           P1.0|-->LED
//
//
//  Wei Zhao
//  Texas Instruments Inc.
//  Jan 2014
//  Built with IAR Embedded Workbench v5.60 & Code Composer Studio v5.5
//******************************************************************************
#include <msp430.h>

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

    // Configure GPIO
    P1DIR |= BIT0;                                // P1.0 output  
    P1OUT |= BIT0;                                // P1.0 high
  
    // Disable the GPIO power-on default high-impedance mode to activate
    // previously configured port settings
    PM5CTL0 &= ~LOCKLPM5;

    TA0CCTL0 |= CCIE;                             // TACCR0 interrupt enabled
    TA0CCR0 = 50000;
    TA0CTL |= TASSEL__SMCLK | MC__CONTINOUS;      // SMCLK, continuous mode

    __bis_SR_register(LPM0_bits | GIE);           // Enter LPM3 w/ interrupts
    __no_operation();                             // For debugger
}

// 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
{
    P1OUT ^= BIT0;
    TA0CCR0 += 50000;                             // Add Offset to TACCR0
}