mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-08-16 22:28:59 +00:00
59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
|
/*
|
||
|
* Copyright (c) 2007, 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 <avr/io.h>
|
||
|
|
||
|
#include "contiki-conf.h"
|
||
|
|
||
|
/*
|
||
|
* On the Tmote sky access to I2C/SPI/UART0 must always be
|
||
|
* exclusive. Set spi_busy so that interrupt handlers can check if
|
||
|
* they are allowed to use the bus or not. Only the CC2420 radio needs
|
||
|
* this in practice.
|
||
|
*
|
||
|
*/
|
||
|
unsigned char spi_busy = 0;
|
||
|
|
||
|
/*
|
||
|
* Initialize SPI bus.
|
||
|
*/
|
||
|
void
|
||
|
spi_init(void)
|
||
|
{
|
||
|
/* Initalize ports for communication with SPI units. */
|
||
|
/* CSN=SS and must be output when master! */
|
||
|
DDRB |= BV(MOSI) | BV(SCK) | BV(CSN);
|
||
|
PORTB |= BV(MOSI) | BV(SCK);
|
||
|
|
||
|
/* Enables SPI, selects "master", clock rate FCK / 2, and SPI mode 0 */
|
||
|
SPCR = BV(SPE) | BV(MSTR);
|
||
|
SPSR = BV(SPI2X);
|
||
|
}
|