168 lines
4.7 KiB
C
168 lines
4.7 KiB
C
/*
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* Contiki PIC32 Port project
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*
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* Copyright (c) 2012,
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* Scuola Superiore Sant'Anna (http://www.sssup.it) and
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* Consorzio Nazionale Interuniversitario per le Telecomunicazioni
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* (http://www.cnit.it).
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*
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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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/**
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* \addtogroup pic32 PIC32 Contiki Port
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*
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* @{
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*/
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/**
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* \file cpu/pic32/clock.c
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* \brief Clock routines.
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* \author Giovanni Pellerano <giovanni.pellerano@evilaliv3.org>
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* \author Daniele Alessandrelli <d.alessandrelli@sssup.it>
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* \date 2012-03-21
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*/
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#include <pic32_clock.h>
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#include <pic32_timer.h>
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#include <pic32_irq.h>
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#include <sys/clock.h>
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#include <sys/etimer.h>
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#include "contiki.h"
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static volatile clock_time_t ticks;
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static volatile unsigned long seconds;
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/*---------------------------------------------------------------------------*/
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static inline void
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clock_callback(void)
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{
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++ticks;
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if(etimer_pending()) {
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etimer_request_poll();
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}
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#if (CLOCK_CONF_SECOND & (CLOCK_CONF_SECOND - 1)) != 0
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#error CLOCK_CONF_SECOND must be a power of two (i.e., 1, 2, 4, 8, 16, 32, 64, ...).
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#error Change CLOCK_CONF_SECOND in contiki-conf.h.
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#endif
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if((ticks % CLOCK_SECOND) == 0) {
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++seconds;
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}
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}
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/*---------------------------------------------------------------------------*/
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clock_time_t
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clock_time(void)
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{
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return ticks;
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}
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/*---------------------------------------------------------------------------*/
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unsigned long
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clock_seconds(void)
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{
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return seconds;
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}
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/*---------------------------------------------------------------------------*/
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void
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clock_set_seconds(unsigned long sec)
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{
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seconds = sec;
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}
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/*---------------------------------------------------------------------------*/
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#define CLOCK_INIT(XX) \
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void \
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clock_init(void) \
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{ \
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ticks = 0; \
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seconds = 0; \
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pic32_timer##XX##_init(CLOCK_SECOND);\
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pic32_timer##XX##_enable_irq(); \
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pic32_timer##XX##_start(); \
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}
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#if PIC32_TIMER_CLOCK == 1
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CLOCK_INIT(1)
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#elif PIC32_TIMER_CLOCK == 2
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CLOCK_INIT(2)
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#elif PIC32_TIMER_CLOCK == 3
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CLOCK_INIT(3)
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#elif PIC32_TIMER_CLOCK == 4
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CLOCK_INIT(4)
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#elif PIC32_TIMER_CLOCK == 5
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CLOCK_INIT(5)
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#endif
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/*---------------------------------------------------------------------------*/
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void
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clock_delay_usec(uint16_t dt)
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{
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uint32_t now;
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uint32_t stop;
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asm volatile("mfc0 %0, $9" : "=r"(now));
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/* The Count register is incremented every two system clock (SYSCLK) cycles. */
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stop = now + dt * ((pic32_clock_get_system_clock() / 1000000) / 2);
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for(;;) {
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asm volatile("mfc0 %0, $9" : "=r"(now));
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if((int32_t)(now - stop) >= 0) {
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break;
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Deprecated platform-specific routines.
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*
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*/
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inline void
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clock_delay(unsigned int delay)
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{
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clock_delay_usec(delay);
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}
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/*---------------------------------------------------------------------------*/
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#if PIC32_TIMER_CLOCK == 1
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TIMER_INTERRUPT(1, clock_callback);
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#elif PIC32_TIMER_CLOCK == 2
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TIMER_INTERRUPT(2, clock_callback);
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#elif PIC32_TIMER_CLOCK == 3
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TIMER_INTERRUPT(3, clock_callback);
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#elif PIC32_TIMER_CLOCK == 4
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TIMER_INTERRUPT(4, clock_callback);
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#elif PIC32_TIMER_CLOCK == 5
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TIMER_INTERRUPT(5, clock_callback);
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#endif
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/** @} */
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