nes-proj/platform/galileo/core/sys/clock.c

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/*
* Copyright (C) 2015, Intel Corporation. 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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 "sys/clock.h"
#include "sys/etimer.h"
#include "contiki-conf.h"
#include "drivers/legacy_pc/rtc.h"
#if CLOCK_CONF_SECOND == 2
#define FREQ RTC_2_HZ
#elif CLOCK_CONF_SECOND == 4
#define FREQ RTC_4_HZ
#elif CLOCK_CONF_SECOND == 8
#define FREQ RTC_8_HZ
#elif CLOCK_CONF_SECOND == 16
#define FREQ RTC_16_HZ
#elif CLOCK_CONF_SECOND == 32
#define FREQ RTC_32_HZ
#elif CLOCK_CONF_SECOND == 64
#define FREQ RTC_64_HZ
#elif CLOCK_CONF_SECOND == 128
#define FREQ RTC_128_HZ
#elif CLOCK_CONF_SECOND == 256
#define FREQ RTC_256_HZ
#elif CLOCK_CONF_SECOND == 512
#define FREQ RTC_512_HZ
#elif CLOCK_CONF_SECOND == 1024
#define FREQ RTC_1024_HZ
#elif CLOCK_CONF_SECOND == 2048
#define FREQ RTC_2048_HZ
#elif CLOCK_CONF_SECOND == 4096
#define FREQ RTC_4096_HZ
#elif CLOCK_CONF_SECOND == 8192
#define FREQ RTC_8192_HZ
#else
#define FREQ -1
#error "RTC is being used thus CLOCK_CONF_SECOND has to be a value defined by rtc_frequency_t."
#endif
static volatile clock_time_t tick_count = 0;
static void
update_ticks(void)
{
clock_time_t expire = etimer_next_expiration_time();
tick_count++;
/* Notify etimer library if the next event timer has expired */
if(expire != 0 && tick_count >= expire) {
etimer_request_poll();
}
}
/*---------------------------------------------------------------------------*/
void
clock_init(void)
{
rtc_init(FREQ, update_ticks);
}
/*---------------------------------------------------------------------------*/
clock_time_t
clock_time(void)
{
return tick_count;
}
/*---------------------------------------------------------------------------*/
unsigned long
clock_seconds(void)
{
return tick_count / CLOCK_CONF_SECOND;
}
/*---------------------------------------------------------------------------*/
void
clock_wait(clock_time_t t)
{
clock_time_t initial = tick_count;
while(tick_count < t + initial);
}
/*---------------------------------------------------------------------------*/
void
clock_set_seconds(unsigned long sec)
{
/* Stubbed function */
}
/*---------------------------------------------------------------------------*/
void
clock_delay_usec(uint16_t t)
{
/* Stubbed function */
}