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110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/* ----> DO NOT REMOVE THE FOLLOWING NOTICE <----
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*
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* Copyright (c) 2014-2015 Datalight, Inc.
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* All Rights Reserved Worldwide.
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*
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* This program 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; use version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but "AS-IS," WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* Businesses and individuals that for commercial or other reasons cannot
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* comply with the terms of the GPLv2 license may obtain a commercial license
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* before incorporating Reliance Edge into proprietary software for
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* distribution in any form. Visit http://www.datalight.com/reliance-edge for
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* more information.
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*/
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/** @file
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* @brief Implements timestamp functions.
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*
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* The functionality implemented herein is not needed for the file system
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* driver, only to provide accurate results with performance tests.
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*/
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#include <FreeRTOS.h>
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#include <task.h>
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#include <redfs.h>
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/* configTICK_RATE_HZ is almost always 100, 250, 500, or 1000. If
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* 1000000U % configTICK_RATE_HZ != 0, then RedOsTimePassed() will be a
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* little inaccurate.
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*/
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#define MICROSECS_PER_TICK ( 1000000U / configTICK_RATE_HZ )
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/** @brief Initialize the timestamp service.
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*
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* The behavior of invoking this function when timestamps are already
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* initialized is undefined.
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*
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* @return A negated ::REDSTATUS code indicating the operation result.
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*
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* @retval 0 Operation was successful.
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* @retval -RED_ENOSYS The timestamp service has not been implemented.
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*/
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REDSTATUS RedOsTimestampInit( void )
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{
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return 0;
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}
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/** @brief Uninitialize the timestamp service.
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*
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* The behavior of invoking this function when timestamps are not initialized
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* is undefined.
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*
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* @return A negated ::REDSTATUS code indicating the operation result.
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*
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* @retval 0 Operation was successful.
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*/
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REDSTATUS RedOsTimestampUninit( void )
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{
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return 0;
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}
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/** @brief Retrieve a timestamp.
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*
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* The behavior of invoking this function when timestamps are not initialized
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* is undefined
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*
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* @return A timestamp which can later be passed to RedOsTimePassed() to
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* determine the amount of time which passed between the two calls.
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*/
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REDTIMESTAMP RedOsTimestamp( void )
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{
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return xTaskGetTickCount();
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}
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/** @brief Determine how much time has passed since a timestamp was retrieved.
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*
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* The behavior of invoking this function when timestamps are not initialized
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* is undefined.
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*
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* @param tsSince A timestamp acquired earlier via RedOsTimestamp().
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*
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* @return The number of microseconds which have passed since @p tsSince.
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*/
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uint64_t RedOsTimePassed( REDTIMESTAMP tsSince )
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{
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/* This works even if the tick count has wrapped around, provided it has
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* only wrapped around once.
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*/
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uint32_t ulTicksPassed = ( uint32_t ) xTaskGetTickCount() - tsSince;
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uint64_t ullMicrosecs = ( uint64_t ) ulTicksPassed * MICROSECS_PER_TICK;
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return ullMicrosecs;
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}
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