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+/* --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:
+ *
+ * *  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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * *  Neither the name of Texas Instruments Incorporated nor the names of
+ *    its contributors may be used to endorse or promote products derived
+ *    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,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *******************************************************************************
+ * 
+ *                       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--*/
+//******************************************************************************
+//  MSP430F20x2 Demo - ADC10, Sample A1, 1.5V, TA1 Trig, Set P1.0 if > 0.5V
+//
+//  Description: A1 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 A1 > 0.5Vcc, P1.0 is set,
+//  else reset. Normal mode is LPM3.
+//  //* An external watch crystal on XIN XOUT is required for ACLK *//
+//
+//               MSP430F20x2
+//            -----------------
+//        /|\|              XIN|-
+//         | |                 | 32kHz
+//         --|RST          XOUT|-
+//           |                 |
+//       >---|P1.1/A1     P1.0 |--> LED
+//
+//  L. Westlund
+//  Texas Instruments Inc.
+//  May 2006
+//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
+//******************************************************************************
+#include <msp430.h>
+
+int main(void)
+{
+  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
+  ADC10CTL1 = SHS_1 + CONSEQ_2 + INCH_1;    // TA1 trigger sample start
+  ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
+  __enable_interrupt();                     // 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
+  __disable_interrupt();
+  ADC10CTL0 |= ENC;                         // ADC10 Enable
+  ADC10AE0 |= 0x02;                         // P1.1 ADC10 option select
+  P1DIR |= 0x01;                            // Set P1.0 output
+  TACCR0 = 2048-1;                          // PWM Period
+  TACCTL1 = OUTMOD_3;                       // TACCR1 set/reset
+  TACCR1 = 2047;                            // TACCR1 PWM Duty Cycle
+  TACTL = TASSEL_1 + MC_1;                  // ACLK, up mode
+
+  __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3 w/ interrupts
+}
+
+// ADC10 interrupt service routine
+#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
+#pragma vector=ADC10_VECTOR
+__interrupt void ADC10_ISR(void)
+#elif defined(__GNUC__)
+void __attribute__ ((interrupt(ADC10_VECTOR))) ADC10_ISR (void)
+#else
+#error Compiler not supported!
+#endif
+{
+  if (ADC10MEM < 0x155)                     // ADC10MEM = A1 > 0.5V?
+    P1OUT &= ~0x01;                         // Clear P1.0 LED off
+  else
+    P1OUT |= 0x01;                          // Set P1.0 LED on
+}
+
+#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
+#pragma vector=TIMERA0_VECTOR
+__interrupt void ta0_isr(void)
+#elif defined(__GNUC__)
+void __attribute__ ((interrupt(TIMERA0_VECTOR))) ta0_isr (void)
+#else
+#error Compiler not supported!
+#endif
+{
+  TACTL = 0;
+  LPM0_EXIT;                                // Exit LPM0 on return
+}