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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--*/
+//******************************************************************************
+//  MSP430F20xx Demo - Software Port Interrupt Service on P1.4 from LPM4
+//
+//  Description: A hi/low transition on P1.4 will trigger P1_ISR which,
+//  toggles P1.0. Normal mode is LPM4 ~ 0.1uA. LPM4 current can be measured
+//  with the LED removed, all unused P1.x/P2.x configured as output or inputs
+//  pulled high or low, and ensure the P1.4 interrupt input does not float.
+//  ACLK = n/a, MCLK = SMCLK = default DCO
+//
+//               MSP430F20xx
+//            -----------------
+//        /|\|              XIN|-
+//         | |                 |
+//         --|RST          XOUT|-
+//     /|\   |                 |
+//      --o--|P1.4         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
+  P1IE |= 0x10;                             // P1.4 interrupt enabled
+  P1IES |= 0x10;                            // P1.4 Hi/lo edge
+  P1IFG &= ~0x10;                           // P1.4 IFG cleared
+
+  __bis_SR_register(LPM4_bits + GIE);       // Enter LPM4 w/interrupt
+}
+
+// Port 1 interrupt service routine
+#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
+#pragma vector=PORT1_VECTOR
+__interrupt void Port_1(void)
+#elif defined(__GNUC__)
+void __attribute__ ((interrupt(PORT1_VECTOR))) Port_1 (void)
+#else
+#error Compiler not supported!
+#endif
+{
+  P1OUT ^= 0x01;                            // P1.0 = toggle
+  P1IFG &= ~0x10;                           // P1.4 IFG cleared
+}
+