514 lines
17 KiB
C
514 lines
17 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.
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This file is part of ChibiOS.
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ChibiOS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file chvt.h
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* @brief Time and Virtual Timers module macros and structures.
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*
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* @addtogroup time
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* @{
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*/
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#ifndef _CHVT_H_
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#define _CHVT_H_
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/*===========================================================================*/
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/* Module constants. */
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/*===========================================================================*/
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/**
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* @name Special time constants
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* @{
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*/
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/**
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* @brief Zero time specification for some functions with a timeout
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* specification.
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* @note Not all functions accept @p TIME_IMMEDIATE as timeout parameter,
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* see the specific function documentation.
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*/
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#define TIME_IMMEDIATE ((systime_t)0)
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/**
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* @brief Infinite time specification for all functions with a timeout
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* specification.
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* @note Not all functions accept @p TIME_INFINITE as timeout parameter,
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* see the specific function documentation.
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*/
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#define TIME_INFINITE ((systime_t)-1)
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/** @} */
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/*===========================================================================*/
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/* Module pre-compile time settings. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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#if (CH_CFG_ST_RESOLUTION != 16) && (CH_CFG_ST_RESOLUTION != 32)
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#error "invalid CH_CFG_ST_RESOLUTION specified, must be 16 or 32"
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#endif
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#if CH_CFG_ST_FREQUENCY <= 0
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#error "invalid CH_CFG_ST_FREQUENCY specified, must be greater than zero"
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#endif
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#if (CH_CFG_ST_TIMEDELTA < 0) || (CH_CFG_ST_TIMEDELTA == 1)
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#error "invalid CH_CFG_ST_TIMEDELTA specified, must " \
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"be zero or greater than one"
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#endif
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#if (CH_CFG_ST_TIMEDELTA > 0) && (CH_CFG_TIME_QUANTUM > 0)
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#error "CH_CFG_TIME_QUANTUM not supported in tickless mode"
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#endif
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#if (CH_CFG_ST_TIMEDELTA > 0) && CH_DBG_THREADS_PROFILING
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#error "CH_DBG_THREADS_PROFILING not supported in tickless mode"
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#endif
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/*===========================================================================*/
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/* Module data structures and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module macros. */
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/*===========================================================================*/
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/**
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* @name Time conversion utilities
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* @{
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*/
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/**
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* @brief Seconds to system ticks.
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* @details Converts from seconds to system ticks number.
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* @note The result is rounded upward to the next tick boundary.
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*
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* @param[in] sec number of seconds
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* @return The number of ticks.
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*
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* @api
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*/
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#define S2ST(sec) \
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((systime_t)((uint32_t)(sec) * (uint32_t)CH_CFG_ST_FREQUENCY))
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/**
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* @brief Milliseconds to system ticks.
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* @details Converts from milliseconds to system ticks number.
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* @note The result is rounded upward to the next tick boundary.
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*
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* @param[in] msec number of milliseconds
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* @return The number of ticks.
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*
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* @api
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*/
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#define MS2ST(msec) \
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((systime_t)(((((uint32_t)(msec)) * \
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((uint32_t)CH_CFG_ST_FREQUENCY) - 1UL) / 1000UL) + 1UL))
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/**
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* @brief Microseconds to system ticks.
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* @details Converts from microseconds to system ticks number.
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* @note The result is rounded upward to the next tick boundary.
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*
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* @param[in] usec number of microseconds
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* @return The number of ticks.
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*
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* @api
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*/
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#define US2ST(usec) \
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((systime_t)(((((uint32_t)(usec)) * \
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((uint32_t)CH_CFG_ST_FREQUENCY) - 1UL) / 1000000UL) + 1UL))
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/**
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* @brief System ticks to seconds.
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* @details Converts from system ticks number to seconds.
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* @note The result is rounded up to the next second boundary.
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*
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* @param[in] n number of system ticks
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* @return The number of seconds.
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*
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* @api
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*/
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#define ST2S(n) (((((n) - 1UL) * 1UL) / CH_CFG_ST_FREQUENCY) + 1UL)
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/**
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* @brief System ticks to milliseconds.
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* @details Converts from system ticks number to milliseconds.
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* @note The result is rounded up to the next millisecond boundary.
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*
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* @param[in] n number of system ticks
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* @return The number of milliseconds.
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*
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* @api
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*/
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#define ST2MS(n) (((((n) - 1UL) * 1000UL) / CH_CFG_ST_FREQUENCY) + 1UL)
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/**
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* @brief System ticks to microseconds.
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* @details Converts from system ticks number to microseconds.
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* @note The result is rounded up to the next microsecond boundary.
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*
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* @param[in] n number of system ticks
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* @return The number of microseconds.
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*
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* @api
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*/
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#define ST2US(n) (((((n) - 1UL) * 1000000UL) / CH_CFG_ST_FREQUENCY) + 1UL)
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/** @} */
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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/*
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* Virtual Timers APIs.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void _vt_init(void);
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void chVTDoSetI(virtual_timer_t *vtp, systime_t delay,
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vtfunc_t vtfunc, void *par);
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void chVTDoResetI(virtual_timer_t *vtp);
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#ifdef __cplusplus
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}
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#endif
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/*===========================================================================*/
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/* Module inline functions. */
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/*===========================================================================*/
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/**
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* @brief Initializes a @p virtual_timer_t object.
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* @note Initializing a timer object is not strictly required because
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* the function @p chVTSetI() initializes the object too. This
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* function is only useful if you need to perform a @p chVTIsArmed()
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* check before calling @p chVTSetI().
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*
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* @param[out] vtp the @p virtual_timer_t structure pointer
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*
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* @init
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*/
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static inline void chVTObjectInit(virtual_timer_t *vtp) {
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vtp->vt_func = NULL;
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}
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/**
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* @brief Current system time.
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* @details Returns the number of system ticks since the @p chSysInit()
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* invocation.
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* @note The counter can reach its maximum and then restart from zero.
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* @note This function can be called from any context but its atomicity
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* is not guaranteed on architectures whose word size is less than
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* @p systime_t size.
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*
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* @return The system time in ticks.
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*
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* @xclass
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*/
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static inline systime_t chVTGetSystemTimeX(void) {
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#if CH_CFG_ST_TIMEDELTA == 0
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return ch.vtlist.vt_systime;
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#else /* CH_CFG_ST_TIMEDELTA > 0 */
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return port_timer_get_time();
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#endif /* CH_CFG_ST_TIMEDELTA > 0 */
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}
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/**
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* @brief Current system time.
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* @details Returns the number of system ticks since the @p chSysInit()
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* invocation.
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* @note The counter can reach its maximum and then restart from zero.
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*
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* @return The system time in ticks.
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*
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* @api
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*/
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static inline systime_t chVTGetSystemTime(void) {
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systime_t systime;
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chSysLock();
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systime = chVTGetSystemTimeX();
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chSysUnlock();
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return systime;
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}
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/**
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* @brief Returns the elapsed time since the specified start time.
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*
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* @param[in] start start time
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* @return The elapsed time.
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*
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* @xclass
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*/
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static inline systime_t chVTTimeElapsedSinceX(systime_t start) {
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return chVTGetSystemTimeX() - start;
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}
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/**
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* @brief Checks if the specified time is within the specified time window.
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* @note When start==end then the function returns always true because the
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* whole time range is specified.
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* @note This function can be called from any context.
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*
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* @param[in] time the time to be verified
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* @param[in] start the start of the time window (inclusive)
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* @param[in] end the end of the time window (non inclusive)
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* @retval true current time within the specified time window.
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* @retval false current time not within the specified time window.
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*
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* @xclass
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*/
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static inline bool chVTIsTimeWithinX(systime_t time,
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systime_t start,
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systime_t end) {
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return (bool)(time - start < end - start);
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}
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/**
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* @brief Checks if the current system time is within the specified time
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* window.
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* @note When start==end then the function returns always true because the
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* whole time range is specified.
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*
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* @param[in] start the start of the time window (inclusive)
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* @param[in] end the end of the time window (non inclusive)
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* @retval true current time within the specified time window.
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* @retval false current time not within the specified time window.
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*
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* @xclass
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*/
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static inline bool chVTIsSystemTimeWithinX(systime_t start, systime_t end) {
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return chVTIsTimeWithinX(chVTGetSystemTimeX(), start, end);
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}
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/**
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* @brief Checks if the current system time is within the specified time
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* window.
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* @note When start==end then the function returns always true because the
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* whole time range is specified.
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*
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* @param[in] start the start of the time window (inclusive)
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* @param[in] end the end of the time window (non inclusive)
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* @retval true current time within the specified time window.
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* @retval false current time not within the specified time window.
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*
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* @api
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*/
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static inline bool chVTIsSystemTimeWithin(systime_t start, systime_t end) {
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return chVTIsTimeWithinX(chVTGetSystemTime(), start, end);
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}
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/**
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* @brief Returns @p true if the specified timer is armed.
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* @pre The timer must have been initialized using @p chVTObjectInit()
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* or @p chVTDoSetI().
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*
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* @param[in] vtp the @p virtual_timer_t structure pointer
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* @return true if the timer is armed.
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*
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* @iclass
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*/
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static inline bool chVTIsArmedI(virtual_timer_t *vtp) {
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chDbgCheckClassI();
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return (bool)(vtp->vt_func != NULL);
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}
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/**
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* @brief Disables a Virtual Timer.
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* @note The timer is first checked and disabled only if armed.
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* @pre The timer must have been initialized using @p chVTObjectInit()
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* or @p chVTDoSetI().
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*
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* @param[in] vtp the @p virtual_timer_t structure pointer
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*
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* @iclass
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*/
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static inline void chVTResetI(virtual_timer_t *vtp) {
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if (chVTIsArmedI(vtp))
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chVTDoResetI(vtp);
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}
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/**
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* @brief Disables a Virtual Timer.
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* @note The timer is first checked and disabled only if armed.
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* @pre The timer must have been initialized using @p chVTObjectInit()
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* or @p chVTDoSetI().
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*
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* @param[in] vtp the @p virtual_timer_t structure pointer
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*
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* @api
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*/
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static inline void chVTReset(virtual_timer_t *vtp) {
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chSysLock();
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chVTResetI(vtp);
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chSysUnlock();
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}
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/**
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* @brief Enables a virtual timer.
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* @details If the virtual timer was already enabled then it is re-enabled
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* using the new parameters.
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* @pre The timer must have been initialized using @p chVTObjectInit()
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* or @p chVTDoSetI().
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*
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* @param[in] vtp the @p virtual_timer_t structure pointer
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* @param[in] delay the number of ticks before the operation timeouts, the
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* special values are handled as follow:
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* - @a TIME_INFINITE is allowed but interpreted as a
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* normal time specification.
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* - @a TIME_IMMEDIATE this value is not allowed.
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* .
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* @param[in] vtfunc the timer callback function. After invoking the
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* callback the timer is disabled and the structure can
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* be disposed or reused.
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* @param[in] par a parameter that will be passed to the callback
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* function
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*
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* @iclass
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*/
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static inline void chVTSetI(virtual_timer_t *vtp, systime_t delay,
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vtfunc_t vtfunc, void *par) {
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chVTResetI(vtp);
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chVTDoSetI(vtp, delay, vtfunc, par);
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}
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/**
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* @brief Enables a virtual timer.
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* @details If the virtual timer was already enabled then it is re-enabled
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* using the new parameters.
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* @pre The timer must have been initialized using @p chVTObjectInit()
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* or @p chVTDoSetI().
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*
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* @param[in] vtp the @p virtual_timer_t structure pointer
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* @param[in] delay the number of ticks before the operation timeouts, the
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* special values are handled as follow:
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* - @a TIME_INFINITE is allowed but interpreted as a
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* normal time specification.
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* - @a TIME_IMMEDIATE this value is not allowed.
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* .
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* @param[in] vtfunc the timer callback function. After invoking the
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* callback the timer is disabled and the structure can
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* be disposed or reused.
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* @param[in] par a parameter that will be passed to the callback
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* function
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*
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* @api
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*/
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static inline void chVTSet(virtual_timer_t *vtp, systime_t delay,
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vtfunc_t vtfunc, void *par) {
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chSysLock();
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chVTSetI(vtp, delay, vtfunc, par);
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chSysUnlock();
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}
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/**
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* @brief Virtual timers ticker.
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* @note The system lock is released before entering the callback and
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* re-acquired immediately after. It is callback's responsibility
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* to acquire the lock if needed. This is done in order to reduce
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* interrupts jitter when many timers are in use.
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*
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* @iclass
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*/
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static inline void chVTDoTickI(void) {
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chDbgCheckClassI();
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#if CH_CFG_ST_TIMEDELTA == 0
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ch.vtlist.vt_systime++;
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if (&ch.vtlist != (virtual_timers_list_t *)ch.vtlist.vt_next) {
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virtual_timer_t *vtp;
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--ch.vtlist.vt_next->vt_delta;
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while (!(vtp = ch.vtlist.vt_next)->vt_delta) {
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vtfunc_t fn = vtp->vt_func;
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vtp->vt_func = (vtfunc_t)NULL;
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vtp->vt_next->vt_prev = (virtual_timer_t *)&ch.vtlist;
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ch.vtlist.vt_next = vtp->vt_next;
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chSysUnlockFromISR();
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fn(vtp->vt_par);
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chSysLockFromISR();
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}
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}
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#else /* CH_CFG_ST_TIMEDELTA > 0 */
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virtual_timer_t *vtp;
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systime_t now;
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while (true) {
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vtfunc_t fn;
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systime_t delta;
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/* Getting the current system time and calculating the time window since
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the last time has expired.*/
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now = chVTGetSystemTimeX();
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delta = now - ch.vtlist.vt_lasttime;
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/* The next element is outside the current time window, the loop
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is stopped here.*/
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if ((vtp = ch.vtlist.vt_next)->vt_delta > delta)
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break;
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/* The "last time" becomes this timer's expiration time.*/
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delta -= vtp->vt_delta;
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ch.vtlist.vt_lasttime += vtp->vt_delta;
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/* The timer is removed from the list and marked as non-armed.*/
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vtp->vt_next->vt_prev = (virtual_timer_t *)&ch.vtlist;
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ch.vtlist.vt_next = vtp->vt_next;
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fn = vtp->vt_func;
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vtp->vt_func = (vtfunc_t)NULL;
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/* The callback is invoked outside the kernel critical zone.*/
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chSysUnlockFromISR();
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fn(vtp->vt_par);
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chSysLockFromISR();
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}
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if (&ch.vtlist == (virtual_timers_list_t *)ch.vtlist.vt_next) {
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/* The list is empty, no tick event needed so the alarm timer
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is stopped.*/
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port_timer_stop_alarm();
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}
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else {
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/* Updating the alarm to the next deadline, deadline that must not be
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closer in time than the minimum time delta.*/
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if (vtp->vt_delta >= CH_CFG_ST_TIMEDELTA)
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port_timer_set_alarm(now + vtp->vt_delta);
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else
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port_timer_set_alarm(now + CH_CFG_ST_TIMEDELTA);
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}
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#endif /* CH_CFG_ST_TIMEDELTA > 0 */
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}
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#endif /* _CHVT_H_ */
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/** @} */
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