contiki/cpu/nrf52832/rtimer-arch.c

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2016-01-09 13:44:18 +00:00
/*
* Copyright (c) 2015 Nordic Semiconductor. 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/**
* \addtogroup nrf52832
* @{
*
* \file
* Implementation of the architecture dependent rtimer functions for the nRF52
*
* \author
* Wojciech Bober <wojciech.bober@nordicsemi.no>
*/
/*---------------------------------------------------------------------------*/
#include <stdint.h>
#include <stddef.h>
#include "nrf.h"
#include "nrf_drv_timer.h"
#include "app_error.h"
#include "contiki.h"
#include "platform-conf.h"
static const nrf_drv_timer_t timer = NRF_DRV_TIMER_INSTANCE(PLATFORM_TIMER_INSTANCE_ID); /**< Timer instance used for rtimer */
/**
* \brief Handler for timer events.
*
* \param event_type type of an event that should be handled
* \param p_context opaque data pointer passed from nrf_drv_timer_init()
*/
static void
timer_event_handler(nrf_timer_event_t event_type, void* p_context)
{
switch (event_type) {
case NRF_TIMER_EVENT_COMPARE1:
rtimer_run_next();
break;
default:
//Do nothing.
break;
}
}
/*---------------------------------------------------------------------------*/
/**
* \brief Initialize platform rtimer
*/
void
rtimer_arch_init(void)
{
ret_code_t err_code = nrf_drv_timer_init(&timer, NULL, timer_event_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_enable(&timer);
}
/*---------------------------------------------------------------------------*/
/**
* \brief Schedules an rtimer task to be triggered at time t
* \param t The time when the task will need executed.
*
* \e t is an absolute time, in other words the task will be executed AT
* time \e t, not IN \e t rtimer ticks.
*
* This function schedules a one-shot event with the nRF RTC.
*/
void
rtimer_arch_schedule(rtimer_clock_t t)
{
nrf_drv_timer_compare(&timer, NRF_TIMER_CC_CHANNEL1, t, true);
}
/*---------------------------------------------------------------------------*/
/**
* \brief Returns the current real-time clock time
* \return The current rtimer time in ticks
*
*/
rtimer_clock_t
rtimer_arch_now()
{
return nrf_drv_timer_capture(&timer, NRF_TIMER_CC_CHANNEL0);
}
/*---------------------------------------------------------------------------*/
/**
* @}
*/