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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--*/
+//******************************************************************************
+//  MSP430F20x2/3 Demo - SPI full-Duplex 3-wire Slave
+//
+//  Description: SPI Master communicates full-duplex with SPI Slave using
+//  3-wire mode. The level on P1.4 is TX'ed and RX'ed to P1.0.
+//  Master will pulse slave reset for synch start.
+//  ACLK = n/a, MCLK = SMCLK = Default DCO
+//
+//                Slave                      Master
+//               MSP430F20x2/3              MSP430F20x2/3
+//             -----------------          -----------------
+//            |              XIN|-    /|\|              XIN|-
+//            |                 |      | |                 |
+//            |             XOUT|-     --|RST          XOUT|-
+//            |                 | /|\    |                 |
+//            |          RST/NMI|--+<----|P1.2             |
+//      LED <-|P1.0             |        |             P1.4|<-
+//          ->|P1.4             |        |             P1.0|-> LED
+//            |         SDI/P1.7|<-------|P1.6/SDO         |
+//            |         SDO/P1.6|------->|P1.7/SDI         |
+//            |        SCLK/P1.5|<-------|P1.5/SCLK        |
+//
+//  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
+  P1OUT =  0x10;                        // P1.4 set, else reset
+  P1REN |= 0x10;                        // P1.4 pullup
+  P1DIR = 0x01;                         // P1.0 output, else input
+  USICTL0 |= USIPE7 + USIPE6 + USIPE5 + USIOE; // Port, SPI slave
+  USICTL1 |= USIIE;                     // Counter interrupt, flag remains set
+  USICTL0 &= ~USISWRST;                 // USI released for operation
+  USISRL = P1IN;                        // init-load data
+  USICNT = 8;                           // init-load counter
+
+  __bis_SR_register(LPM0_bits + GIE);   // Enter LPM0 w/ interrupt
+}
+
+// USI interrupt service routine
+#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
+#pragma vector=USI_VECTOR
+__interrupt void universal_serial_interface(void)
+#elif defined(__GNUC__)
+void __attribute__ ((interrupt(USI_VECTOR))) universal_serial_interface (void)
+#else
+#error Compiler not supported!
+#endif
+{
+  if (0x10 & USISRL)
+    P1OUT |= 0x01;
+  else
+    P1OUT &= ~0x01;
+  USISRL = P1IN;
+  USICNT = 8;                           // re-load counter
+}