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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file STM32F0xx/systick.h
* @brief System timer header file.
*
* @addtogroup STM32F0XX_TIMER
* @{
*/
#ifndef _SYSTICK_H_
#define _SYSTICK_H_
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
/**
* @brief Returns the system time.
*
* @return The system time.
*
* @notapi
*/
static inline systime_t port_timer_get_time(void) {
return TIM2->CNT;
}
/**
* @brief Starts the alarm.
* @note Makes sure that no spurious alarms are triggered after
* this call.
*
* @param[in] time the time to be set for the first alarm
*
* @notapi
*/
static inline void port_timer_start_alarm(systime_t time) {
chDbgAssert((TIM2->DIER & 2) == 0, "already started");
TIM2->CCR1 = time;
TIM2->SR = 0;
TIM2->DIER = 2; /* CC1IE */
}
/**
* @brief Stops the alarm interrupt.
*
* @notapi
*/
static inline void port_timer_stop_alarm(void) {
chDbgAssert((TIM2->DIER & 2) != 0, "not started");
TIM2->DIER = 0;
}
/**
* @brief Sets the alarm time.
*
* @param[in] time the time to be set for the next alarm
*
* @notapi
*/
static inline void port_timer_set_alarm(systime_t time) {
chDbgAssert((TIM2->DIER & 2) != 0, "not started");
TIM2->CCR1 = time;
}
/**
* @brief Returns the current alarm time.
*
* @return The currently set alarm time.
*
* @notapi
*/
static inline systime_t port_timer_get_alarm(void) {
chDbgAssert((TIM2->DIER & 2) != 0, "not started");
return TIM2->CCR1;
}
#endif /* _SYSTICK_H_ */
/** @} */
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