nes-proj/arch/platform/jn516x/dev/rtimer-arch.c

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/*
* Copyright (c) 2014, SICS Swedish ICT.
* 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.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* RTIMER for NXP jn516x
* \author
* Beshr Al Nahas <beshr@sics.se>
* Atis Elsts <atis.elsts@sics.se>
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*/
#include "sys/rtimer.h"
#include "sys/clock.h"
#include <AppHardwareApi.h>
#include <PeripheralRegs.h>
#include <MicroSpecific.h>
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#include "dev/watchdog.h"
#include "sys/process.h"
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#if !RTIMER_USE_32KHZ
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#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#define RTIMER_TIMER_ISR_DEV E_AHI_DEVICE_TICK_TIMER
static volatile rtimer_clock_t scheduled_time;
static volatile uint8_t has_next;
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void
rtimer_arch_run_next(uint32 u32DeviceId, uint32 u32ItemBitmap)
{
uint32_t delta;
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if(u32DeviceId != RTIMER_TIMER_ISR_DEV) {
return;
}
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vAHI_TickTimerIntPendClr();
vAHI_TickTimerIntEnable(0);
/*
* compare register is only 28bits wide so make sure the upper 4bits match
* the set compare point
*/
delta = u32AHI_TickTimerRead() - scheduled_time;
if(delta >> 28 == 0) {
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/* run scheduled */
has_next = 0;
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watchdog_start();
rtimer_run_next();
process_nevents();
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} else {
/* No match. Schedule again. */
vAHI_TickTimerIntEnable(1);
vAHI_TickTimerInterval(scheduled_time);
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}
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_init(void)
{
/* Initialise tick timer to run continuously */
vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_DISABLE);
vAHI_TickTimerIntEnable(0);
vAHI_TickTimerRegisterCallback(rtimer_arch_run_next);
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vAHI_TickTimerWrite(0);
vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_CONT);
/* enable wakeup timers, but keep interrupts disabled */
vAHI_WakeTimerEnable(WAKEUP_TIMER, FALSE);
vAHI_WakeTimerEnable(TICK_TIMER, FALSE);
/* count down from zero (2, as values 0 and 1 must not be used) */
vAHI_WakeTimerStartLarge(TICK_TIMER, 2);
(void)u32AHI_Init();
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_reinit(rtimer_clock_t sleep_start, rtimer_clock_t sleep_ticks)
{
uint64_t t;
/* Initialise tick timer to run continuously */
vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_DISABLE);
vAHI_TickTimerIntEnable(0);
/* set the highest priority for the rtimer interrupt */
vAHI_InterruptSetPriority(MICRO_ISR_MASK_TICK_TMR, 15);
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vAHI_TickTimerRegisterCallback(rtimer_arch_run_next);
WAIT_FOR_EDGE(t);
vAHI_TickTimerWrite(sleep_start + sleep_ticks);
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vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_CONT);
/* call pending interrupts */
u32AHI_Init();
if(has_next) {
vAHI_TickTimerIntPendClr();
vAHI_TickTimerIntEnable(1);
vAHI_TickTimerInterval(scheduled_time);
}
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}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
rtimer_arch_now(void)
{
return u32AHI_TickTimerRead();
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_schedule(rtimer_clock_t t)
{
PRINTF("rtimer_arch_schedule time %lu\n", t);
vAHI_TickTimerIntPendClr();
vAHI_TickTimerIntEnable(1);
vAHI_TickTimerInterval(t);
has_next = 1;
scheduled_time = t;
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}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
rtimer_arch_time_to_rtimer(void)
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{
rtimer_clock_t now = RTIMER_NOW();
if(has_next) {
return scheduled_time >= now ? scheduled_time - now : 0;
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}
/* if no wakeup is scheduled yet return maximum time */
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return (rtimer_clock_t)-1;
}
/*---------------------------------------------------------------------------*/
#endif /* !RTIMER_USE_32KHZ */