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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 chtm.h
* @brief Time Measurement module macros and structures.
*
* @addtogroup time_measurement
* @{
*/
#ifndef _CHTM_H_
#define _CHTM_H_
#if CH_CFG_USE_TM || defined(__DOXYGEN__)
#define port_rt_get_counter_value() 0
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/**
* @brief Type of a Time Measurement object.
* @note The maximum measurable time period depends on the implementation
* of the realtime counter and its clock frequency.
* @note The measurement is not 100% cycle-accurate, it can be in excess
* of few cycles depending on the compiler and target architecture.
* @note Interrupts can affect measurement if the measurement is performed
* with interrupts enabled.
*/
typedef struct {
rtcnt_t best; /**< @brief Best measurement. */
rtcnt_t worst; /**< @brief Worst measurement. */
rtcnt_t cumulative; /**< @brief Cumulative measurement. */
rtcnt_t last; /**< @brief Last measurement. */
} time_measurement_t;
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
/**
* @name Time conversion utilities for the realtime counter
* @{
*/
/**
* @brief Seconds to realtime counter.
* @details Converts from seconds to realtime counter cycles.
* @note The result is rounded upward to the next tick boundary.
*
* @param[in] sec number of seconds
* @return The number of cycles.
*
* @api
*/
#define S2RTV(freq, sec) ((freq) * (sec))
/**
* @brief Milliseconds to realtime counter.
* @details Converts from milliseconds to realtime counter cycles.
* @note The result is rounded upward to the next tick boundary.
*
* @param[in] msec number of milliseconds
* @return The number of cycles.
*
* @api
*/
#define MS2RTC(freq, msec) (rtcnt_t)((((freq) + 999UL) / 1000UL) * (msec))
/**
* @brief Microseconds to realtime counter.
* @details Converts from microseconds to realtime counter cycles.
* @note The result is rounded upward to the next tick boundary.
*
* @param[in] usec number of microseconds
* @return The number of cycles.
*
* @api
*/
#define US2RTC(freq, usec) (rtcnt_t)((((freq) + 999999UL) / 1000000UL) * (usec))
/**
* @brief Realtime counter cycles to seconds.
* @details Converts from realtime counter cycles number to seconds.
*
* @param[in] n number of cycles
* @return The number of seconds.
*
* @api
*/
#define RTC2S(freq, n) (rtcnt_t)((n) / (freq))
/**
* @brief Realtime counter cycles to milliseconds.
* @details Converts from realtime counter cycles number to milliseconds.
*
* @param[in] n number of cycles
* @return The number of milliseconds.
*
* @api
*/
#define RTC2MS(freq, n) ((n) / ((freq) / 1000UL))
/**
* @brief Realtime counter cycles to microseconds.
* @details Converts from realtime counter cycles number to microseconds.
*
* @param[in] n number of cycles
* @return The number of microseconds.
*
* @api
*/
#define RTC2US(freq, n) ((n) / ((freq) / 1000000UL))
/** @} */
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void _rt_init(void);
bool chRTIsCounterWithin(rtcnt_t start, rtcnt_t end);
void chRTPolledDelay(rtcnt_t cycles);
void chRTTimeMeasurementObjectInit(time_measurement_t *tmp);
NOINLINE void chRTTimeMeasurementStartX(time_measurement_t *tmp);
NOINLINE void chRTTimeMeasurementStopX(time_measurement_t *tmp);
#ifdef __cplusplus
}
#endif
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
#endif /* CH_CFG_USE_TM */
#endif /* _CHTM_H_ */
/** @} */
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