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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 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 tm.c
* @brief Time Measurement unit code.
*
* @addtogroup TM
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_TM
/**
* @brief Subsystem calibration value.
*/
static halrtcnt_t measurement_offset;
/**
* @brief Starts a measurement.
*
* @param[in,out] tmp pointer to a @p TimeMeasurement structure
*
* @notapi
*/
static void tm_start(TimeMeasurement *tmp) {
tmp->last = halGetCounterValue();
}
/**
* @brief Stops a measurement.
*
* @param[in,out] tmp pointer to a @p TimeMeasurement structure
*
* @notapi
*/
static void tm_stop(TimeMeasurement *tmp) {
halrtcnt_t now = halGetCounterValue();
tmp->last = now - tmp->last - measurement_offset;
if (tmp->last > tmp->worst)
tmp->worst = tmp->last;
else if (tmp->last < tmp->best)
tmp->best = tmp->last;
}
/**
* @brief Initializes the Time Measurement unit.
*
* @init
*/
void tmInit(void) {
TimeMeasurement tm;
/* Time Measurement subsystem calibration, it does a null measurement
and calculates the call overhead which is subtracted to real
measurements.*/
measurement_offset = 0;
tmObjectInit(&tm);
tmStartMeasurement(&tm);
tmStopMeasurement(&tm);
measurement_offset = tm.last;
}
/**
* @brief Initializes a @p TimeMeasurement object.
*
* @param[out] tmp pointer to a @p TimeMeasurement structure
*
* @init
*/
void tmObjectInit(TimeMeasurement *tmp) {
tmp->start = tm_start;
tmp->stop = tm_stop;
tmp->last = (halrtcnt_t)0;
tmp->worst = (halrtcnt_t)0;
tmp->best = (halrtcnt_t)-1;
}
#endif /* HAL_USE_TM */
/** @} */
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