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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file tm.h
* @brief Time Measurement driver header.
*
* @addtogroup TM
* @{
*/
#ifndef _TM_H_
#define _TM_H_
#if HAL_USE_TM || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Type of a Time Measurement object.
* @note Start/stop of measurements is performed through the function
* pointers in order to avoid inlining of those functions which
* could compromise measurement accuracy.
* @note The maximum measurable time period depends on the implementation
* of the realtime counter in the HAL driver.
* @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 TimeMeasurement TimeMeasurement;
/**
* @brief Time Measurement structure.
*/
struct TimeMeasurement {
void (*start)(TimeMeasurement *tmp); /**< @brief Starts a measurement. */
void (*stop)(TimeMeasurement *tmp); /**< @brief Stops a measurement. */
halrtcnt_t last; /**< @brief Last measurement. */
halrtcnt_t worst; /**< @brief Worst measurement. */
halrtcnt_t best; /**< @brief Best measurement. */
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @brief Starts a measurement.
* @pre The @p TimeMeasurement must be initialized.
* @note This function can be invoked in any context.
*
* @param[in,out] tmp pointer to a @p TimeMeasurement structure
*
* @special
*/
#define tmStartMeasurement(tmp) (tmp)->start(tmp)
/**
* @brief Stops a measurement.
* @pre The @p TimeMeasurement must be initialized.
* @note This function can be invoked in any context.
*
* @param[in,out] tmp pointer to a @p TimeMeasurement structure
*
* @special
*/
#define tmStopMeasurement(tmp) (tmp)->stop(tmp)
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void tmInit(void);
void tmObjectInit(TimeMeasurement *tmp);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_TM */
#endif /* _TM_H_ */
/** @} */
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