123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/*
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* Copyright (c) 2010, Loughborough University - 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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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Hardware-dependent functions used to support the
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* contiki rtimer module.
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*
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* clock and etimer are using the sleep timer on the cc2430
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*
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* clock_init() has set our tick speed prescaler already, so we
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* are ticking with 500 kHz freq.
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*
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* rtimer_clock_t is unsigned short (16bit on the cc2430)
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* It thus makes sense to use the 16bit clock (Timer 1)
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*
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* This file contains an ISR and must reside in the HOME bank
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*
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* \author
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* George Oikonomou - <oikonomou@users.sourceforge.net>
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*/
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#include "sys/rtimer.h" /* Includes rtimer-arch.h for us */
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#include "cc2430_sfr.h"
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#include "sys/energest.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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void
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rtimer_arch_init(void)
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{
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PRINTF("rtimer_arch_init() ");
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/*
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* - Free running mode
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* - Prescale by 32:
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* Tick Speed has been prescaled to 500 kHz already in clock_init()
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* We further prescale by 32 resulting in 15625 Hz for this timer.
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*/
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T1CTL = (T1DIV1 | T1MODE0); /* 00001001 */
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PRINTF("T1CTL=0x%02x\n", T1CTL);
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/* Acknowledge Timer 1 Interrupts */
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IEN1_T1IE = 1;
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PRINTF("IEN1_T1IE=0x%02x\n", IEN1_T1IE);
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/* Timer 1, Channel 1. Compare Mode (0x04), Interrupt mask on (0x40) */
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T1CCTL1 = T1MODE + T1IM;
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PRINTF("T1CCTL1=0x%02x\n", T1CCTL1);
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/* Interrupt Mask Flags: No interrupt on overflow */
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TIMIF &= ~OVFIM;
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PRINTF("TIMIF=0x%02x\n", TIMIF);
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PRINTF("done\n");
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}
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/*---------------------------------------------------------------------------*/
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void
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rtimer_arch_schedule(rtimer_clock_t t)
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{
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PRINTF("rtimer_arch_schedule(%u)\n", t);
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/* set the compare mode values so we can get an interrupt after t */
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T1CC1L = (unsigned char) t;
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T1CC1H = (unsigned char) (t >> 8);
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PRINTF("T1CC1=%u, t=%u\n", (T1CC1L + (T1CC1H << 8)), t);
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/* Turn on compare mode interrupt */
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PRINTF("T1CTL=0x%02x\n", T1CTL);
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T1CCTL1 |= T1IM;
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}
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/*---------------------------------------------------------------------------*/
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void
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cc2430_timer_1_ISR(void) __interrupt (T1_VECTOR)
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{
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IEN1_T1IE = 0; /* Ignore Timer 1 Interrupts */
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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/* No more interrupts from Channel 1 till next rtimer_arch_schedule() call.
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* Setting the mask will instantly generate an interrupt so we clear the
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* flag first. */
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T1CTL &= ~(CH1IF);
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T1CCTL1 &= ~T1IM;
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rtimer_run_next();
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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IEN1_T1IE = 1; /* Acknowledge Timer 1 Interrupts */
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}
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