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140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
/*
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* Copyright (c) 2014, SICS Swedish ICT.
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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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* RTIMER for NXP jn516x
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* \author
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* Beshr Al Nahas <beshr@sics.se>
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*/
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#include "sys/rtimer.h"
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#include "sys/clock.h"
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#include "sys/process.h"
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#include <AppHardwareApi.h>
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#include <PeripheralRegs.h>
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#include "dev/watchdog.h"
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#include "sys/energest.h"
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#define RTIMER_TIMER_ISR_DEV E_AHI_DEVICE_TICK_TIMER
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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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static volatile uint32_t compare_time;
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static volatile uint32_t last_expired_time;
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void
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rtimer_arch_run_next(uint32 u32DeviceId, uint32 u32ItemBitmap)
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{
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uint32_t delta, temp;
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if(u32DeviceId != RTIMER_TIMER_ISR_DEV) {
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return;
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}
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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vAHI_TickTimerIntPendClr();
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vAHI_TickTimerIntEnable(0);
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/*
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* compare register is only 28bits wide so make sure the upper 4bits match
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* the set compare point
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*/
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delta = u32AHI_TickTimerRead() - compare_time;
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if(0 == (delta >> 28)) {
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/* compare_time might change after executing rtimer_run_next()
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* as some process might schedule the timer
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*/
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temp = compare_time;
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/* run scheduled */
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watchdog_start();
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rtimer_run_next();
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if(process_nevents() > 0) {
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/* TODO exit low-power mode */
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}
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watchdog_stop();
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last_expired_time = temp;
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} else {
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/* No match. Schedule again. */
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vAHI_TickTimerIntEnable(1);
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vAHI_TickTimerInterval(compare_time);
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}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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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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/* Initialise tick timer to run continuously */
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vAHI_TickTimerIntEnable(0);
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vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_DISABLE);
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last_expired_time = compare_time = 0;
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vAHI_TickTimerWrite(0);
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vAHI_TickTimerRegisterCallback(rtimer_arch_run_next);
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vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_CONT);
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}
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/*---------------------------------------------------------------------------*/
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rtimer_clock_t
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rtimer_arch_now(void)
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{
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return u32AHI_TickTimerRead();
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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 time %lu\n", t);
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vAHI_TickTimerIntPendClr();
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vAHI_TickTimerIntEnable(1);
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vAHI_TickTimerInterval(t);
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compare_time = t;
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}
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/*---------------------------------------------------------------------------*/
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rtimer_clock_t
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rtimer_arch_get_time_until_next_wakeup(void)
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{
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rtimer_clock_t now = RTIMER_NOW();
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rtimer_clock_t next_wakeup = compare_time;
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if(bAHI_TickTimerIntStatus()) {
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return next_wakeup >= now ? next_wakeup - now : 0;
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/* if no wakeup is scheduled yet return maximum time */
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}
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return (rtimer_clock_t)-1;
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}
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/*---------------------------------------------------------------------------*/
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