183 lines
6 KiB
C
183 lines
6 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: 32 kHz mode
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* \author
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* Atis Elsts <atis.elsts@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 <AppHardwareApi.h>
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#include <PeripheralRegs.h>
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#include <MicroSpecific.h>
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#include "dev/watchdog.h"
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#include "sys/energest.h"
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#include "sys/process.h"
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#if RTIMER_USE_32KHZ
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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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#define RTIMER_TIMER_ISR_DEV E_AHI_DEVICE_SYSCTRL
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/* 1.5 days wraparound time */
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#define MAX_VALUE 0xFFFFFFFF
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/* make this small to more easily detect wraparound bugs */
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#define START_VALUE (60 * RTIMER_ARCH_SECOND)
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#define WRAPAROUND_VALUE ((uint64_t)0x1FFFFFFFFFF)
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static volatile rtimer_clock_t scheduled_time;
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static volatile uint8_t has_next;
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/*---------------------------------------------------------------------------*/
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static void
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timerISR(uint32 u32Device, uint32 u32ItemBitmap)
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{
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PRINTF("\ntimer isr %u %u\n", u32Device, u32ItemBitmap);
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if(u32Device != 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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if(u32ItemBitmap & TICK_TIMER_MASK) {
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/* 32-bit overflow happened; restart the timer */
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uint32_t ticks_late = WRAPAROUND_VALUE - u64AHI_WakeTimerReadLarge(TICK_TIMER);
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PRINTF("\nrtimer oflw, missed ticks %u\n", ticks_late);
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vAHI_WakeTimerStartLarge(TICK_TIMER, MAX_VALUE - ticks_late);
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}
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if(u32ItemBitmap & WAKEUP_TIMER_MASK) {
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PRINTF("\nrtimer fire @ %u\n", rtimer_arch_now());
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/* Compare with the current time, as after sleep there is
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* a fake interrupt generated 10ms earlier to wake up & reinitialize
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* the system before the actual rtimer fires.
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*/
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rtimer_clock_t now = rtimer_arch_now();
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if(RTIMER_CLOCK_LT(now + 1, scheduled_time)) {
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vAHI_WakeTimerEnable(WAKEUP_TIMER, TRUE);
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vAHI_WakeTimerStartLarge(WAKEUP_TIMER, scheduled_time - now);
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} else {
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has_next = 0;
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watchdog_start();
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rtimer_run_next();
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process_nevents();
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}
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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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vAHI_TickTimerWrite(0);
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vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_CONT);
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vAHI_SysCtrlRegisterCallback(timerISR);
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/* set the highest priority for the rtimer interrupt */
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vAHI_InterruptSetPriority(MICRO_ISR_MASK_SYSCTRL, 15);
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/* enable interrupt on a rtimer */
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vAHI_WakeTimerEnable(WAKEUP_TIMER, TRUE);
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/* enable interrupt on 32-bit overflow */
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vAHI_WakeTimerEnable(TICK_TIMER, TRUE);
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/* count down from START_VALUE */
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vAHI_WakeTimerStartLarge(TICK_TIMER, START_VALUE);
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(void)u32AHI_Init();
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}
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/*---------------------------------------------------------------------------*/
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void
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rtimer_arch_reinit(rtimer_clock_t sleep_start, rtimer_clock_t sleep_ticks)
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{
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uint64_t t;
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uint32_t wakeup_time = sleep_start + (uint64_t)sleep_ticks * (F_CPU / 2) / RTIMER_SECOND;
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/* Initialise tick timer to run continuously */
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vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_DISABLE);
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vAHI_TickTimerIntEnable(0);
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WAIT_FOR_EDGE(t);
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vAHI_TickTimerWrite(wakeup_time);
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vAHI_TickTimerConfigure(E_AHI_TICK_TIMER_CONT);
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/* call pending interrupts */
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(void)u32AHI_Init();
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if(has_next) {
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/* reschedule the timer */
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rtimer_arch_schedule(scheduled_time);
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}
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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 START_VALUE - (rtimer_clock_t)u64AHI_WakeTimerReadLarge(TICK_TIMER);
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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_WakeTimerEnable(WAKEUP_TIMER, TRUE);
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vAHI_WakeTimerStartLarge(WAKEUP_TIMER, t - rtimer_arch_now());
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scheduled_time = t;
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has_next = 1;
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}
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/*---------------------------------------------------------------------------*/
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rtimer_clock_t
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rtimer_arch_time_to_rtimer(void)
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{
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rtimer_clock_t now = RTIMER_NOW();
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if(has_next) {
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return scheduled_time >= now ? scheduled_time - now : 0;
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}
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/* if no wakeup is scheduled yet return maximum time */
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return (rtimer_clock_t)-1;
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}
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/*---------------------------------------------------------------------------*/
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#endif /* RTIMER_USE_32KHZ */
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