cpu/avr/cc2420_spi.c

   1 /*
   2  * Copyright (c) 2007, Swedish Institute of Computer Science
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the Institute nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)$Id: cc2420_spi.c,v 1.1 2007/02/01 14:46:07 bg- Exp $
  30  */
  31
  32 #include <avr/io.h>
  33
  34 #include "contiki.h"
  35 #include "contiki-net.h"
  36
  37 #include "dev/spi.h"
  38 #include "dev/cc2420.h"
  39
  40 void
  41 __cc2420_arch_init(void)
  42 {
  43   SFIOR |= BV(PUD);             /* Beware, disable all pull-ups. */
  44
  45   spi_init();
  46
  47   DDRB  |= BV(RESET_N) | BV(VREG_EN) | BV(CSN);
  48   PORTB |= BV(RESET_N) | BV(CSN);
  49
  50   SPI_DISABLE();                /* Unselect radio. */
  51 }
  52
  53 ISR(SIG_INTERRUPT0)
  54 {
  55   __cc2420_intr();
  56 }