contiki/platform/jn516x/dev/rtimer-arch.c

140 lines
4.4 KiB
C

/*
* 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>
*/
#include "sys/rtimer.h"
#include "sys/clock.h"
#include "sys/process.h"
#include <AppHardwareApi.h>
#include <PeripheralRegs.h>
#include "dev/watchdog.h"
#include "sys/energest.h"
#define RTIMER_TIMER_ISR_DEV E_AHI_DEVICE_TICK_TIMER
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
static volatile uint32_t compare_time;
static volatile uint32_t last_expired_time;
void
rtimer_arch_run_next(uint32 u32DeviceId, uint32 u32ItemBitmap)
{
uint32_t delta, temp;
if(u32DeviceId != RTIMER_TIMER_ISR_DEV) {
return;
}
ENERGEST_ON(ENERGEST_TYPE_IRQ);
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() - compare_time;
if(0 == (delta >> 28)) {
/* compare_time might change after executing rtimer_run_next()
* as some process might schedule the timer
*/
temp = compare_time;
/* run scheduled */
watchdog_start();
rtimer_run_next();
if(process_nevents() > 0) {
/* TODO exit low-power mode */
}
watchdog_stop();
last_expired_time = temp;
} else {
/* No match. Schedule again. */
vAHI_TickTimerIntEnable(1);
vAHI_TickTimerInterval(compare_time);
}
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_init(void)
{
/* Initialise tick timer to run continuously */
vAHI_TickTimerIntEnable(0);
vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_DISABLE);
last_expired_time = compare_time = 0;
vAHI_TickTimerWrite(0);
vAHI_TickTimerRegisterCallback(rtimer_arch_run_next);
vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_CONT);
}
/*---------------------------------------------------------------------------*/
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);
compare_time = t;
}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
rtimer_arch_get_time_until_next_wakeup(void)
{
rtimer_clock_t now = RTIMER_NOW();
rtimer_clock_t next_wakeup = compare_time;
if(bAHI_TickTimerIntStatus()) {
return next_wakeup >= now ? next_wakeup - now : 0;
/* if no wakeup is scheduled yet return maximum time */
}
return (rtimer_clock_t)-1;
}
/*---------------------------------------------------------------------------*/