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159 lines
5.0 KiB
C
159 lines
5.0 KiB
C
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/*
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* Copyright (c) 2012, Texas Instruments Incorporated - http://www.ti.com/
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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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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538-rtimer
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* @{
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*
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* \file
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* Implementation of the arch-specific rtimer functions for the cc2538
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*
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*/
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#include "contiki.h"
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#include "sys/energest.h"
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#include "sys/rtimer.h"
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#include "dev/nvic.h"
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#include "dev/smwdthrosc.h"
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#include "cpu.h"
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#include "lpm.h"
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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static volatile rtimer_clock_t next_trigger;
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/*---------------------------------------------------------------------------*/
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/**
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* \brief We don't need to explicitly initialise anything but this
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* routine is required by the API.
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*
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* The Sleep Timer starts ticking automatically as soon as the device
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* turns on. We don't need to turn on interrupts before the first call
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* to rtimer_arch_schedule()
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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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return;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Schedules an rtimer task to be triggered at time t
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* \param t The time when the task will need executed. This is an absolute
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* time, in other words the task will be executed AT time \e t,
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* not IN \e t ticks
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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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rtimer_clock_t now;
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/* STLOAD must be 1 */
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while((REG(SMWDTHROSC_STLOAD) & SMWDTHROSC_STLOAD_STLOAD) != 1);
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INTERRUPTS_DISABLE();
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now = RTIMER_NOW();
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/*
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* New value must be 5 ticks in the future. The ST may tick once while we're
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* writing the registers. We play it safe here and we add a bit of leeway
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*/
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if((int32_t)(t - now) < 7) {
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t = now + 7;
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}
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/* ST0 latches ST[1:3] and must be written last */
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REG(SMWDTHROSC_ST3) = (t >> 24) & 0x000000FF;
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REG(SMWDTHROSC_ST2) = (t >> 16) & 0x000000FF;
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REG(SMWDTHROSC_ST1) = (t >> 8) & 0x000000FF;
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REG(SMWDTHROSC_ST0) = t & 0x000000FF;
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INTERRUPTS_ENABLE();
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/* Store the value. The LPM module will query us for it */
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next_trigger = t;
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nvic_interrupt_enable(NVIC_INT_SM_TIMER);
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}
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/*---------------------------------------------------------------------------*/
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rtimer_clock_t
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rtimer_arch_next_trigger()
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{
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return next_trigger;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Returns the current real-time clock time
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* \return The current rtimer time in ticks
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*/
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rtimer_clock_t
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rtimer_arch_now()
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{
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rtimer_clock_t rv;
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/* SMWDTHROSC_ST0 latches ST[1:3] and must be read first */
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rv = REG(SMWDTHROSC_ST0);
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rv |= (REG(SMWDTHROSC_ST1) << 8);
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rv |= (REG(SMWDTHROSC_ST2) << 16);
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rv |= (REG(SMWDTHROSC_ST3) << 24);
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return rv;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief The rtimer ISR
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*
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* Interrupts are only turned on when we have an rtimer task to schedule
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* Once the interrupt fires, the task is called and then interrupts no
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* longer get acknowledged until the next task needs scheduled.
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*/
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void
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rtimer_isr()
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{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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next_trigger = 0;
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nvic_interrupt_unpend(NVIC_INT_SM_TIMER);
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nvic_interrupt_disable(NVIC_INT_SM_TIMER);
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/*
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* If we were in PM1+, call the wake-up sequence first. This will make sure
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* that the 32MHz OSC is selected as the clock source. We need to do this
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* before calling the next rtimer_task, since the task may need the RF.
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*/
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lpm_exit();
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rtimer_run_next();
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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