spix.c

/*
 * Copyright (c) 2006, Swedish Institute of Computer Science
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. 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. 
 * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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. 
 *
 * @(#)$Id: spix.c,v 1.1 2010/08/24 16:23:20 joxe Exp $
 */

#include <io.h>

#include "contiki-conf.h"

/*
 * This is SPI initialization code for the MSP430X architecture.
 * 
 */
unsigned char spi_busy = 0;

/*
 * Initialize SPI bus.
 */
void
spi_init(void)
{
  //static unsigned char spi_inited = 0;

  //if (spi_inited)
    //return;

  // Initalize ports for communication with SPI units. 

    UCB0CTL1 |=  UCSWRST;                //reset usci
    UCB0CTL1 |=  UCSSEL_2;               //smclk while usci is reset
    UCB0CTL0 = ( UCMSB | UCMST | UCSYNC | UCCKPL); // MSB-first 8-bit, Master, Synchronous, 3 pin SPI master, no ste, watch-out for clock-phase UCCKPH

    UCB0BR1 = 0x00;
    UCB0BR0 = 0x02;

//  UCB0MCTL = 0;                       // Dont need modulation control. 

  P3SEL |= BV(SCK) | BV(MOSI) | BV(MISO); // Select Peripheral functionality 
  P3DIR |= BV(SCK) | BV(MISO);  // Configure as outputs(SIMO,CLK). 

  //ME1   |= USPIE0;            // Module enable ME1 --> U0ME? xxx/bg 
  
  // Clear pending interrupts before enable!!! 
  IFG2 &= ~UCB0RXIFG;
  IFG2 &= ~UCB0TXIFG;
  UCB0CTL1 &= ~UCSWRST;         // Remove RESET before enabling interrupts
  //Enable UCB0 Interrupts 
  //IE2 |= UCB0TXIE;              // Enable USCI_B0 TX Interrupts
  //IE2 |= UCB0RXIE;              // Enable USCI_B0 RX Interrupts
}