contiki/cpu/arm/stm32l152/clock.c

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2015-10-09 17:40:39 +00:00
/*
* Copyright (c) 2012, 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
*
*
*/
/*---------------------------------------------------------------------------*/
#include <stdio.h>
#include "contiki.h"
#include "platform-conf.h"
#include "contiki-conf.h"
#include "dev/leds.h"
#include "stm32l1xx.h"
#include "stm32l1xx_hal_rcc.h"
#include "stm32l1xx_hal_cortex.h"
#include "stm32l1xx_hal.h"
#include "st-lib.h"
/*---------------------------------------------------------------------------*/
#define RELOAD_VALUE ((F_CPU / CLOCK_CONF_SECOND) - 1)
/*---------------------------------------------------------------------------*/
static volatile unsigned long seconds = 0;
static volatile clock_time_t ticks;
void st_lib_sys_tick_handler(void);
/*---------------------------------------------------------------------------*/
void
st_lib_sys_tick_handler(void)
{
ticks++;
if((ticks % CLOCK_SECOND) == 0) {
seconds++;
energest_flush();
}
HAL_IncTick();
if(etimer_pending()) {
etimer_request_poll();
}
}
/*---------------------------------------------------------------------------*/
void
clock_init(void)
{
ticks = 0;
st_lib_hal_systick_clk_source_config(SYSTICK_CLKSOURCE_HCLK);
st_lib_hal_systick_config(RELOAD_VALUE);
}
/*---------------------------------------------------------------------------*/
unsigned long
clock_seconds(void)
{
return seconds;
}
/*---------------------------------------------------------------------------*/
void
clock_set_seconds(unsigned long sec)
{
seconds = sec;
}
/*---------------------------------------------------------------------------*/
clock_time_t
clock_time(void)
{
return ticks;
}
/*---------------------------------------------------------------------------*/
void
clock_delay(unsigned int i)
{
for(; i > 0; i--) {
unsigned int j;
for(j = 50; j > 0; j--) {
asm ("nop");
}
}
}
/*---------------------------------------------------------------------------*/
/* Wait for a multiple of clock ticks (7.8 ms at 128 Hz). */
void
clock_wait(clock_time_t t)
{
clock_time_t start;
start = clock_time();
while(clock_time() - start < (clock_time_t)t) ;
}
/*---------------------------------------------------------------------------*/