contiki/cpu/pic32/rtimer-arch.c

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/*
* Contiki PIC32 Port project
*
* Copyright (c) 2012,
* Scuola Superiore Sant'Anna (http://www.sssup.it) and
* Consorzio Nazionale Interuniversitario per le Telecomunicazioni
* (http://www.cnit.it).
*
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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 pic32 PIC32 Contiki Port
*
* @{
*/
/**
* \file rtimer-arch.c
* \brief PIC32MX RTIMER routines
* \author Giovanni Pellerano <giovanni.pellerano@evilaliv3.org>
* \date 2012-04-11
*/
/*
* PIC32MX795F512L - Specific Functions
*
* All the functions in this part of the file are specific for the
* pic32mx795f512l that is characterized by registers' name that differ from
* the 3xx and 4xx families of the pic32mx.
*/
#include <pic32_timer.h>
#include "contiki.h"
#include <sys/rtimer.h>
#include <sys/clock.h>
#include <stdio.h>
#include <p32xxxx.h>
static uint32_t schedule;
/*---------------------------------------------------------------------------*/
void
rtimer_callback(void)
{
pic32_timer23_disable_irq();
TMR2 = schedule;
rtimer_run_next();
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_init(void)
{
pic32_timer23_disable_irq();
IPC3CLR = _IPC3_T3IP_MASK | _IPC3_T3IS_MASK;
IPC3SET = (7 << _IPC3_T3IP_POSITION) | (3 << _IPC3_T3IS_POSITION);
T2CON = 0;
T3CON = 0;
T2CONSET = _T2CON_T32_MASK | (TIMER_B_PRESCALE_256 << _T2CON_TCKPS_POSITION);
PR2 = 0xFFFFFFFF;
TMR2 = 0;
pic32_timer23_start();
}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
rtimer_arch_now(void)
{
return TMR2;
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_schedule(rtimer_clock_t t)
{
schedule = t;
PR2 = t;
pic32_timer23_enable_irq();
}
/*---------------------------------------------------------------------------*/
TIMER_INTERRUPT(3, rtimer_callback);
/** @} */