/* --COPYRIGHT--,BSD_EX
 * Copyright (c) 2012, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 * *  Neither the name of Texas Instruments Incorporated nor the names of
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 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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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.
 *
 * --/COPYRIGHT--*/
//******************************************************************************
//  MSP430F20xx Demo - Basic Clock, Configure RST/NMI as NMI
//
//  Description: Configure RST/NMI as NMI, hi/lo edge. Flash P1.0  inside of
//  NMI_ISR if NMI occurs. General enable interrupt in status register does
//  not need to be set for NMI. NMIIE does need to be reset, as NMI_ISR
//  automatically clears NMI enable to prevent unintentional stack overflow
//  that could result from, bounce or uncontrolled NMI's.
//  ACLK = n/a, MCLK = SMCLK = DCO ~ 800k
//
//               MSP430F20xx
//            -----------------
//        /|\|              XIN|-
//         | |                 |
//         --|RST          XOUT|-
//           |                 |
//
//  M. Buccini / L. Westlund
//  Texas Instruments Inc.
//  October 2005
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.40A
//******************************************************************************

#include <msp430.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD + WDTNMI + WDTNMIES;  // WDT off NMI hi/lo
  P1DIR |= 0x01;                            // Set P1.0 to output direction
  P1OUT &= ~0x01;                           // Clear P1.0 LED off
  IE1 |= NMIIE;                             // Enable NMI

  __bis_SR_register(LPM0_bits);             // Enter LPM0
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=NMI_VECTOR
__interrupt void nmi_ (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(NMI_VECTOR))) nmi_ (void)
#else
#error Compiler not supported!
#endif
{
  volatile unsigned int i;
  P1OUT |= 0x01;                            // Set P1.0 LED on
  for (i = 20000; i > 0; i--);              // Delay
  P1OUT &= ~0x01;                           // Clear P1.0 LED off
  IFG1 &= ~NMIIFG;                          // Reclear NMI flag in case bounce
  IE1 |= NMIIE;                             // Enable NMI
}