msp430-elf-gcc Interrupts

//******************************************************************************

//  MSP430G2xx3 Demo - WDT, Toggle P1.0, Interval Overflow ISR, DCO SMCLK

//

//  Description: Toggle P1.0 using software timed by the WDT ISR. Toggle rate

//  is approximately 30ms based on default DCO/SMCLK clock source

//  used in this example for the WDT.

//  ACLK = n/a, MCLK = SMCLK = default

//

//      MSP430G2xx3

//             -----------------

//         /|\|              XIN|-

//          | |                 |

//          --|RST          XOUT|-

//            |                 |

//            |             P1.0|-->LED

//

//  D. Dang

//  Texas Instruments Inc.

//  December 2010

//   Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10

//******************************************************************************

#include <msp430.h>

int main(void)

{

  WDTCTL = WDT_MDLY_32;                     // Set Watchdog Timer interval to ~30ms

  IE1 |= WDTIE;                             // Enable WDT interrupt

  P1DIR |= 0x01;                            // Set P1.0 to output direction

  __bis_SR_register(LPM0_bits + GIE);       // Enter LPM0 w/ interrupt

}

// Watchdog Timer interrupt service routine

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)

#pragma vector=WDT_VECTOR

__interrupt void watchdog_timer(void)

#elif defined(__GNUC__)

void __attribute__ ((interrupt(WDT_VECTOR))) watchdog_timer (void)

#else

#error Compiler not supported!

#endif

{

  P1OUT ^= 0x01;                            // Toggle P1.0 using exclusive-OR

}