76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/*
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* Copyright (c) 2009, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include "contiki.h"
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#include "dev/spi.h"
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#include "cc2420.h"
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#include "isr_compat.h"
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extern volatile uint8_t cc2420_sfd_counter;
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extern volatile uint16_t cc2420_sfd_start_time;
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extern volatile uint16_t cc2420_sfd_end_time;
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/*---------------------------------------------------------------------------*/
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/* SFD interrupt for timestamping radio packets */
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ISR(TIMERB1, cc2420_timerb1_interrupt)
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{
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int tbiv;
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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/* always read TBIV to clear IFG */
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tbiv = TBIV;
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if(CC2420_SFD_IS_1) {
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cc2420_sfd_counter++;
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cc2420_sfd_start_time = TBCCR1;
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} else {
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cc2420_sfd_counter = 0;
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cc2420_sfd_end_time = TBCCR1;
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}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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void
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cc2420_arch_sfd_init(void)
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{
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/* Need to select the special function! */
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P4SEL = BV(CC2420_SFD_PIN);
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/* start timer B - 32768 ticks per second */
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TBCTL = TBSSEL_1 | TBCLR;
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/* CM_3 = capture mode - capture on both edges */
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TBCCTL1 = CM_3 | CAP | SCS;
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TBCCTL1 |= CCIE;
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/* Start Timer_B in continuous mode. */
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TBCTL |= MC1;
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TBR = RTIMER_NOW();
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}
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/*---------------------------------------------------------------------------*/
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