contiki/cpu/stm32w108/rtimer-arch.c
2010-10-25 09:03:38 +00:00

176 lines
5.1 KiB
C

/*
* 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.
*
* This file is part of the Contiki OS
*
* $Id: rtimer-arch.c,v 1.1 2010/10/25 09:03:39 salvopitru Exp $
*/
/*---------------------------------------------------------------------------*/
/**
* \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 u32_t time_msb = 0; // Most significant bits of the current time.
// time of the next rtimer event. Initially is set to the max value.
static rtimer_clock_t next_rtimer_time = 0;
static u16_t saved_TIM1CFG;
/*---------------------------------------------------------------------------*/
void halTimer1Isr(void){
if(INT_TIM1FLAG & INT_TIMUIF){ // Overflow event.
//PRINTF("O %4x.\r\n", TIM1_CNT);
//printf("OV ");
time_msb++;
rtimer_clock_t now = ((rtimer_clock_t)time_msb << 16)|TIM1_CNT;
rtimer_clock_t clock_to_wait = next_rtimer_time - now;
if(clock_to_wait <= 0x10000 && clock_to_wait > 0){ // We must set now the Timer Compare Register.
TIM1_CCR1 = (int16u)clock_to_wait;
INT_TIM1FLAG = INT_TIMCC1IF;
INT_TIM1CFG |= INT_TIMCC1IF; // Compare 1 interrupt enable.
}
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;
}
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_init(void)
{
TIM1_CR1 = 0;
TIM1_PSC = RT_PRESCALER;
TIM1_ARR = 0xffff; // Counting from 0 to the maximum value.
// Bits of TIMx_CCMR1 as default.
TIM1_EGR = TIM_UG; // Update Generation.
INT_TIM1FLAG = 0xffff;
INT_TIM1CFG = INT_TIMUIF; // Update interrupt enable (interrupt on overflow).
TIM1_CR1 = TIM_CEN; // Counter enable.
INT_CFGSET = INT_TIM1; // Enable top level interrupt.
}
/*---------------------------------------------------------------------------*/
void rtimer_arch_disable_irq(void)
{
ATOMIC(
saved_TIM1CFG = INT_TIM1CFG;
INT_TIM1CFG = 0;
)
}
/*---------------------------------------------------------------------------*/
void rtimer_arch_enable_irq(void)
{
INT_TIM1CFG = saved_TIM1CFG;
}
/*---------------------------------------------------------------------------*/
rtimer_clock_t rtimer_arch_now(void)
{
return ((rtimer_clock_t)time_msb << 16)|TIM1_CNT;
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_schedule(rtimer_clock_t t)
{
PRINTF("rtimer_arch_schedule time %4x\r\n", /*((u32_t*)&t)+1,*/(u32_t)t);
next_rtimer_time = t;
rtimer_clock_t now = rtimer_arch_now();
rtimer_clock_t clock_to_wait = t - now;
PRINTF("now %2x\r\n", TIM1_CNT);
PRINTF("clock_to_wait %4x\r\n", clock_to_wait);
if(clock_to_wait <= 0x10000){ // We must set now the Timer Compare Register.
TIM1_CCR1 = (int16u)now + (int16u)clock_to_wait;
INT_TIM1FLAG = INT_TIMCC1IF;
INT_TIM1CFG |= INT_TIMCC1IF; // Compare 1 interrupt enable.
PRINTF("2-INT_TIM1FLAG %2x\r\n", INT_TIM1FLAG);
}
// else compare register will be set at overflow interrupt closer to the rtimer event.
}