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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 A7, 1.5V, TA1 Trig, Ultra-Low Pwr
+//
+//  Description: A7 is sampled 1024/second (32xACLK)with reference to 1.5V. All
+//  activity is interrupt driven with proper usage of MSP430 low-power modes,
+//  ADC10 and Vref demonstrated. Timer_A with both TA1/TA0 used in upmode to
+//  drive ADC10 conversion (continuous mode can also be used). Inside
+//  of TA0_ISR software will enable ADC10 and internal reference and
+//  allow > 30us delay for Vref to stabilize prior to sample start. Sample
+//  start is automatically triggered by TA1 every 32 ACLK cycles. ADC10_ISR
+//  will disable ADC10 and Vref and compare ADC10 conversion code. Internal
+//  oscillator times sample (16x) and conversion (13x). If A7 > 0.2Vcc,
+//  P1.0 is set, else reset. Normal Mode is LPM3.
+//  //* An external watch crystal on XIN XOUT is required for ACLK *//
+//
+//                    +-----(0.9766us)---------\\------------------>+
+//    TA0_ISR        TA1      ADC10_ISR             TA0_ISR        TA1
+//  -----+------------+------------+-----------\\------+------------+----->
+//   Enable ADC    Trigger ADC  Disable ADC
+//   and Vref                   Compare
+//       +-( >30us--->+
+//
+//
+//               MSP430F20x2
+//            -----------------
+//        /|\|              XIN|-
+//         | |                 | 32kHz
+//         --|RST          XOUT|-
+//           |                 |
+//       >---|P1.7/A7     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 = INCH_7 + SHS_1;               // P1.7, TA1 trigger sample start
+  ADC10AE0 = 0x80;                          // P1.7 ADC10 option select
+  P1DIR |= 0x01;                            // Set P1.0 to output direction
+  TACCTL0 = CCIE;                           // Enable interrupt
+  TACCR0 = 32-1;                            // PWM Period
+  TACCTL1 = OUTMOD_3;                       // TACCR1 set/reset
+  TACCR1 = 2;                               // TACCR1 PWM Duty Cycle
+  TACTL = TASSEL_1 + MC_1;                  // ACLK, up mode
+  __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3, enable 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
+{
+  ADC10CTL0 &= ~ENC;                        // ADC10 disabled
+  ADC10CTL0 = 0;                            // ADC10, Vref disabled completely
+  if (ADC10MEM < 0x88)                      // ADC10MEM = A7 > 0.2V?
+    P1OUT &= ~0x01;                         // Clear P1.0 LED off
+  else
+    P1OUT |= 0x01;                          // Set P1.0 LED on
+}
+
+// Timer A0 interrupt service routine
+#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
+#pragma vector=TIMERA0_VECTOR
+__interrupt void Timer_A(void)
+#elif defined(__GNUC__)
+void __attribute__ ((interrupt(TIMERA0_VECTOR))) Timer_A (void)
+#else
+#error Compiler not supported!
+#endif
+{
+  ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
+  ADC10CTL0 |= ENC;                         // ADC10 enable set
+}