//******************************************************************************
//  MSP-FET430P120 Demo - ADC10, Sample A0, 1.5V, TA1 Trig, Set P1.0 if > 0.5V
//
//  Description: A0 is sampled 16/second (ACLK/2048) with reference to 1.5V.
//  Timer_A is run in upmode and TA1 is used to automatically trigger
//  ADC10 conversion, TA0 defines the period. Internal oscillator times sample
//  (16x) and conversion (13x). Inside ADC10_ISR if A0 > 0.5Vcc, P1.0 is set,
//  else reset. Normal mode is LPM3.
//  //* An external watch crystal on XIN XOUT is required for ACLK *//	
//  //* MSP430F1232 or MSP430F1132 Device Required *//
//
//               MSP430F1232
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//       >---|A0          P1.0 |--> LED
//
//  M. Buccini
//  Texas Instruments Inc.
//  Feb 2005
//  Built with IAR Embedded Workbench Version: 3.21A
//******************************************************************************

#include  <msp430x12x2.h>

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  ADC10CTL1 = SHS_1 + CONSEQ_2;        	    // TA1 trigger sample start
  ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
  _EINT();                                  // Enable interrupts.
  TACCR0 = 30;                              // Delay to allow Ref to settle
  TACCTL0 |= CCIE;                          // Compare-mode interrupt.
  TACTL = TASSEL_2 | MC_1;                  // TACLK = SMCLK, Up mode.
  LPM0;                                     // Wait for delay.
  TACCTL0 &= ~CCIE;                         // Disable timer Interrupt
  _DINT();
  ADC10CTL0 |= ENC;			    // ADC10 Enable
  ADC10AE |= 0x01;                          // P2.0 ADC10 option select
  P1DIR |= 0x01;                            // Set P1.0 output
  CCR0 = 2048-1; 	                    // PWM Period
  CCTL1 = OUTMOD_3; 		            // CCR1 set/reset
  CCR1 = 2047;                              // CCR1 PWM Duty Cycle	
  TACTL = TASSEL_1 + MC_1;                  // ACLK, up mode

  _BIS_SR(LPM3_bits + GIE);                 // Enter LPM3 w/ interrupts
}

// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
  if (ADC10MEM < 0x155)                     // ADC10MEM = A0 > 0.5V?
  P1OUT &= ~0x01;                           // Clear P1.0 LED off
  else
  P1OUT |= 0x01;                            // Set P1.0 LED on
}

#pragma vector=TIMERA0_VECTOR
__interrupt void ta0_isr(void)
{
  TACTL = 0;
  LPM0_EXIT;                                // Exit LPM0 on return
}// ta0_isr()