131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*
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* Copyright (c) 2010, STMicroelectronics.
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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
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the Contiki OS
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*
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* $Id: clock.c,v 1.1 2010/10/25 09:03:38 salvopitru Exp $
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \file
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* Clock.
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* \author
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* Salvatore Pitrulli <salvopitru@users.sourceforge.net>
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*/
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/*---------------------------------------------------------------------------*/
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#include PLATFORM_HEADER
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#include "hal/error.h"
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#include "hal/hal.h"
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#include "dev/stm32w_systick.h"
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#include "sys/clock.h"
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#include "sys/etimer.h"
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// The value that will be load in the SysTick value register.
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#define RELOAD_VALUE 24000-1 // 1 ms with a 24 MHz clock
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static volatile clock_time_t count;
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static volatile unsigned long current_seconds = 0;
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static unsigned int second_countdown = CLOCK_SECOND;
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/*---------------------------------------------------------------------------*/
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void SysTick_Handler(void)
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{
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count++;
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if(etimer_pending()) {
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etimer_request_poll();
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}
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if (--second_countdown == 0) {
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current_seconds++;
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second_countdown = CLOCK_SECOND;
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}
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}
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/*---------------------------------------------------------------------------*/
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void clock_init(void)
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{
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INTERRUPTS_OFF();
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//Counts the number of ticks.
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count = 0;
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
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SysTick_SetReload(RELOAD_VALUE);
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SysTick_ITConfig(ENABLE);
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SysTick_CounterCmd(SysTick_Counter_Enable);
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INTERRUPTS_ON();
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}
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/*---------------------------------------------------------------------------*/
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clock_time_t clock_time(void)
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{
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return count;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Delay the CPU for a multiple of TODO
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*/
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void clock_delay(unsigned int i)
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{
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for (; i > 0; i--) { /* Needs fixing XXX */
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unsigned j;
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for (j = 50; j > 0; j--)
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asm ("nop");
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Wait for a multiple of 1 ms.
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*
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*/
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void clock_wait(int i)
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{
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clock_time_t start;
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start = clock_time();
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while(clock_time() - start < (clock_time_t)i);
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}
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/*---------------------------------------------------------------------------*/
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unsigned long clock_seconds(void)
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{
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return current_seconds;
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}
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