nes-proj/cpu/stm32w108/clock.c
2010-10-25 09:03:38 +00:00

131 lines
3.6 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: clock.c,v 1.1 2010/10/25 09:03:38 salvopitru Exp $
*/
/*---------------------------------------------------------------------------*/
/**
* \file
* Clock.
* \author
* Salvatore Pitrulli <salvopitru@users.sourceforge.net>
*/
/*---------------------------------------------------------------------------*/
#include PLATFORM_HEADER
#include "hal/error.h"
#include "hal/hal.h"
#include "dev/stm32w_systick.h"
#include "sys/clock.h"
#include "sys/etimer.h"
// The value that will be load in the SysTick value register.
#define RELOAD_VALUE 24000-1 // 1 ms with a 24 MHz clock
static volatile clock_time_t count;
static volatile unsigned long current_seconds = 0;
static unsigned int second_countdown = CLOCK_SECOND;
/*---------------------------------------------------------------------------*/
void SysTick_Handler(void)
{
count++;
if(etimer_pending()) {
etimer_request_poll();
}
if (--second_countdown == 0) {
current_seconds++;
second_countdown = CLOCK_SECOND;
}
}
/*---------------------------------------------------------------------------*/
void clock_init(void)
{
INTERRUPTS_OFF();
//Counts the number of ticks.
count = 0;
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
SysTick_SetReload(RELOAD_VALUE);
SysTick_ITConfig(ENABLE);
SysTick_CounterCmd(SysTick_Counter_Enable);
INTERRUPTS_ON();
}
/*---------------------------------------------------------------------------*/
clock_time_t clock_time(void)
{
return count;
}
/*---------------------------------------------------------------------------*/
/**
* Delay the CPU for a multiple of TODO
*/
void clock_delay(unsigned int i)
{
for (; i > 0; i--) { /* Needs fixing XXX */
unsigned j;
for (j = 50; j > 0; j--)
asm ("nop");
}
}
/*---------------------------------------------------------------------------*/
/**
* Wait for a multiple of 1 ms.
*
*/
void clock_wait(int i)
{
clock_time_t start;
start = clock_time();
while(clock_time() - start < (clock_time_t)i);
}
/*---------------------------------------------------------------------------*/
unsigned long clock_seconds(void)
{
return current_seconds;
}