nes-proj/platform/exp5438/spix.c

78 lines
2.8 KiB
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.
*
*/
#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)
{
/* Initalize ports for communication with SPI units. */
UCB0CTL1 |= UCSWRST; /* Reset USCI */
UCB0CTL1 |= UCSSEL_2; /* smclk while usci is reset */
/* MSB-first 8-bit, Master, Synchronous, 3 pin SPI master, no ste,
watch-out for clock-phase UCCKPH */
UCB0CTL0 = (UCMSB | UCMST | UCSYNC | UCCKPL);
/* Set up SPI bus speed. */
UCB0BR1 = 0x00;
UCB0BR0 = 0x01;
/* Dont need modulation control. */
/* UCB0MCTL = 0; */
/* Select Peripheral functionality */
P3SEL |= BV(SCK) | BV(MOSI) | BV(MISO);
/* Configure as outputs(SIMO,CLK). */
P3DIR |= BV(SCK) | BV(MISO);
/* Clear pending interrupts before enabling. */
UCB0IE &= ~UCRXIFG;
UCB0IE &= ~UCTXIFG;
/* Remove RESET before enabling interrupts */
UCB0CTL1 &= ~UCSWRST;
/* Enable UCB0 Interrupts */
/* Enable USCI_B0 TX Interrupts */
/* IE2 |= UCB0TXIE; */
/* Enable USCI_B0 RX Interrupts */
/* IE2 |= UCB0RXIE; */
}
/*---------------------------------------------------------------------------*/