/* --COPYRIGHT--,BSD_EX
 * Copyright (c) 2012, Texas Instruments Incorporated
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 * 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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 *******************************************************************************
 * 
 *                       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 - Timer_A, Toggle P1.0, CCR1 Cont. Mode ISR, DCO SMCLK
//
//  Description: Toggle P1.0 using software and TA_1 ISR. Toggles every
//  50000 SMCLK cycles. SMCLK provides clock source for TACLK.
//  During the TA_1 ISR, P1.0 is toggled and 50000 clock cycles are added to
//  CCR0. TA_1 ISR is triggered every 50000 cycles. CPU is normally off and
//  used only during TA_ISR. Proper use of the TAIV interrupt vector generator
//  is demonstrated.
//  ACLK = n/a, MCLK = SMCLK = TACLK = default DCO
//
//           MSP430F20xx
//         ---------------
//     /|\|            XIN|-
//      | |               |
//      --|RST        XOUT|-
//        |               |
//        |           P1.0|-->LED
//
//  M. Buccini / L. Westlund
//  Texas Instruments Inc.
//  September 2005
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.40A
//******************************************************************************

#include <msp430.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  P1DIR |= 0x01;                            // P1.0 output
  CCTL1 = CCIE;                             // CCR1 interrupt enabled
  CCR1 = 50000;
  TACTL = TASSEL_2 + MC_2;                  // SMCLK, Contmode

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

// Timer_A3 Interrupt Vector (TAIV) handler
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMERA1_VECTOR
__interrupt void Timer_A(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMERA1_VECTOR))) Timer_A (void)
#else
#error Compiler not supported!
#endif
{
  switch( TAIV )
  {
  case  2:                                  // CCR1
    {
    P1OUT ^= 0x01;                          // Toggle P1.0
    CCR1 += 50000;                          // Add Offset to CCR1
    }
           break;
  case  4: break;                           // CCR2 not used
  case 10: break;                           // overflow not used
 }
}