nes-proj/arch/cpu/msp430/f2xxx/spi.c

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/*
* 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.
*/
#include "contiki.h"
/*
* This is SPI initialization code for the MSP430X architecture.
*
*/
unsigned char spi_busy = 0;
/*
* Initialize SPI bus.
*/
void
spi_init(void)
{
// Initialize 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;
/* UCB0IE &= ~UCRXIFG; */
/* UCB0IE &= ~UCTXIFG; */
UCB0CTL1 &= ~UCSWRST; // Remove RESET before enabling interrupts
//Enable UCB0 Interrupts
//IE2 |= UCB0TXIE; // Enable USCI_B0 TX Interrupts
//IE2 |= UCB0RXIE; // Enable USCI_B0 RX Interrupts
}