nes-proj/cpu/stm32w108/clock.c

/**
 * \addtogroup mbxxx-platform
 *
 * @{
 */

/*
 * 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.
 *
 */

/**
* \file
*			Clock.
* \author
*			Salvatore Pitrulli <salvopitru@users.sourceforge.net>
*/

#include PLATFORM_HEADER
#include <stdio.h>
#include "hal/error.h"
#include "hal/hal.h"
#include "dev/stm32w-systick.h"

#include "contiki.h"
#include "sys/clock.h"

#include "uart1.h"
#include "dev/leds.h"
#include "dev/stm32w-radio.h"

#define DEBUG DEBUG_NONE
#include "net/uip-debug.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)
{
  ATOMIC(
    /* Counts the number of ticks. */
    count = 0;
    SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
    SysTick_SetReload(RELOAD_VALUE);
    SysTick_ITConfig(ENABLE);
    SysTick_CounterCmd(SysTick_Counter_Enable);)
}
/*---------------------------------------------------------------------------*/
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(clock_time_t i)
{
  clock_time_t start;

  start = clock_time();
  while(clock_time() - start < (clock_time_t) i);
}
/*---------------------------------------------------------------------------*/
unsigned long
clock_seconds(void)
{
  return current_seconds;
}
/*--------------------------------------------------------------------------*/
/** @} */