contiki/cpu/stm32w108/rtimer-arch.c

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/**
* \addtogroup mbxxx-platform
*
* @{
*/
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/*
* Copyright (c) 2010, STMicroelectronics.
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
*/
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/**
* \file
* Real-timer specific implementation for STM32W.
* \author
* Salvatore Pitrulli <salvopitru@users.sourceforge.net>
*/
#include "sys/energest.h"
#include "sys/rtimer.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
static uint16_t saved_TIM1CFG;
static uint32_t time_msb = 0; /* Most significant bits of the current time. */
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/* time of the next rtimer event. Initially is set to the max
value. */
static rtimer_clock_t next_rtimer_time = 0;
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/*---------------------------------------------------------------------------*/
void
halTimer1Isr(void)
{
if(INT_TIM1FLAG & INT_TIMUIF) {
rtimer_clock_t now, clock_to_wait;
/* Overflow event. */
/* PRINTF("O %4x.\r\n", TIM1_CNT); */
/* printf("OV "); */
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time_msb++;
now = ((rtimer_clock_t) time_msb << 16) | TIM1_CNT;
clock_to_wait = next_rtimer_time - now;
if(clock_to_wait <= 0x10000 && clock_to_wait > 0) {
/* We must now set the Timer Compare Register. */
TIM1_CCR1 = (uint16_t) clock_to_wait;
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INT_TIM1FLAG = INT_TIMCC1IF;
INT_TIM1CFG |= INT_TIMCC1IF; /* Compare 1 interrupt enable. */
}
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INT_TIM1FLAG = INT_TIMUIF;
} else {
if(INT_TIM1FLAG & INT_TIMCC1IF) {
/* Compare event. */
INT_TIM1CFG &= ~INT_TIMCC1IF; /* Disable the next compare interrupt */
PRINTF("\nCompare event %4x\r\n", TIM1_CNT);
PRINTF("INT_TIM1FLAG %2x\r\n", INT_TIM1FLAG);
ENERGEST_ON(ENERGEST_TYPE_IRQ);
rtimer_run_next();
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
INT_TIM1FLAG = INT_TIMCC1IF;
}
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}
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_init(void)
{
TIM1_CR1 = 0;
TIM1_PSC = RTIMER_ARCH_PRESCALER;
/* Counting from 0 to the maximum value. */
TIM1_ARR = 0xffff;
/* Bits of TIMx_CCMR1 as default. */
/* Update Generation. */
TIM1_EGR = TIM_UG;
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INT_TIM1FLAG = 0xffff;
/* Update interrupt enable (interrupt on overflow).*/
INT_TIM1CFG = INT_TIMUIF;
/* Counter enable. */
TIM1_CR1 = TIM_CEN;
/* Enable top level interrupt. */
INT_CFGSET = INT_TIM1;
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}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_disable_irq(void)
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{
ATOMIC(saved_TIM1CFG = INT_TIM1CFG; INT_TIM1CFG = 0;)
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}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_enable_irq(void)
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{
INT_TIM1CFG = saved_TIM1CFG;
}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
rtimer_arch_now(void)
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{
rtimer_clock_t t;
ATOMIC(t = ((rtimer_clock_t) time_msb << 16) | TIM1_CNT;)
return t;
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}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_schedule(rtimer_clock_t t)
{
rtimer_clock_t now, clock_to_wait;
PRINTF("rtimer_arch_schedule time %4x\r\n", /*((uint32_t*)&t)+1, */
(uint32_t)t);
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next_rtimer_time = t;
now = rtimer_arch_now();
clock_to_wait = t - now;
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PRINTF("now %2x\r\n", TIM1_CNT);
PRINTF("clock_to_wait %4x\r\n", clock_to_wait);
if(clock_to_wait <= 0x10000) {
/* We must now set the Timer Compare Register. */
TIM1_CCR1 = (uint16_t)now + (uint16_t)clock_to_wait;
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INT_TIM1FLAG = INT_TIMCC1IF;
INT_TIM1CFG |= INT_TIMCC1IF; /* Compare 1 interrupt enable. */
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PRINTF("2-INT_TIM1FLAG %2x\r\n", INT_TIM1FLAG);
}
/* else compare register will be set at overflow interrupt closer to
the rtimer event. */
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}
/*---------------------------------------------------------------------------*/
/** @} */