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 * Copyright (c) 2012, Texas Instruments Incorporated
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 *    notice, this list of conditions and the following disclaimer.
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 * 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--*/
//******************************************************************************
//  MSP430F20x3 Demo - SD16A, Sample A1+ Continuously, Set P1.0 if > 0.3V
//
//  Description: A continuous single-ended sample is made on A1+ using internal
//  VRef Unipolar output format used.
//  Inside of SD16 ISR, if A1 > 1/2VRef (0.3V), P1.0 set, else reset.
//  ACLK = n/a, MCLK = SMCLK = SD16CLK = default DCO
//
//                MSP430F20x3
//             ------------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//    Vin+ -->|A1+ P1.2         |
//            |A1- = VSS    P1.0|-->LED
//            |                 |
//
//  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;                 // Stop watchdog timer
  P1DIR |= 0x01;                            // Set P1.0 to output direction
  SD16CTL = SD16REFON + SD16SSEL_1;         // 1.2V ref, SMCLK
  SD16INCTL0 = SD16INCH_1;                  // A1+/-
  SD16CCTL0 =  SD16UNI + SD16IE;            // 256OSR, unipolar, interrupt enable
  SD16AE = SD16AE2;                         // P1.1 A1+, A1- = VSS
  SD16CCTL0 |= SD16SC;                      // Set bit to start conversion

  __bis_SR_register(LPM0_bits + GIE);
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = SD16_VECTOR
__interrupt void SD16ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(SD16_VECTOR))) SD16ISR (void)
#else
#error Compiler not supported!
#endif
{
  if (SD16MEM0 < 0x7FFF)           	    // SD16MEM0 > 0.3V?, clears IFG
    P1OUT &= ~0x01;
  else
    P1OUT |= 0x01;
}