110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
/* ----> DO NOT REMOVE THE FOLLOWING NOTICE <----
|
|
|
|
Copyright (c) 2014-2015 Datalight, Inc.
|
|
All Rights Reserved Worldwide.
|
|
|
|
This program 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; use version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but "AS-IS," 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, write to the Free Software Foundation, Inc.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
/* Businesses and individuals that for commercial or other reasons cannot
|
|
comply with the terms of the GPLv2 license may obtain a commercial license
|
|
before incorporating Reliance Edge into proprietary software for
|
|
distribution in any form. Visit http://www.datalight.com/reliance-edge for
|
|
more information.
|
|
*/
|
|
/** @file
|
|
@brief Implements timestamp functions.
|
|
|
|
The functionality implemented herein is not needed for the file system
|
|
driver, only to provide accurate results with performance tests.
|
|
*/
|
|
#include <FreeRTOS.h>
|
|
#include <task.h>
|
|
|
|
#include <redfs.h>
|
|
|
|
|
|
/* configTICK_RATE_HZ is almost always 100, 250, 500, or 1000. If
|
|
1000000U % configTICK_RATE_HZ != 0, then RedOsTimePassed() will be a
|
|
little inaccurate.
|
|
*/
|
|
#define MICROSECS_PER_TICK (1000000U / configTICK_RATE_HZ)
|
|
|
|
|
|
/** @brief Initialize the timestamp service.
|
|
|
|
The behavior of invoking this function when timestamps are already
|
|
initialized is undefined.
|
|
|
|
@return A negated ::REDSTATUS code indicating the operation result.
|
|
|
|
@retval 0 Operation was successful.
|
|
@retval -RED_ENOSYS The timestamp service has not been implemented.
|
|
*/
|
|
REDSTATUS RedOsTimestampInit(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** @brief Uninitialize the timestamp service.
|
|
|
|
The behavior of invoking this function when timestamps are not initialized
|
|
is undefined.
|
|
|
|
@return A negated ::REDSTATUS code indicating the operation result.
|
|
|
|
@retval 0 Operation was successful.
|
|
*/
|
|
REDSTATUS RedOsTimestampUninit(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** @brief Retrieve a timestamp.
|
|
|
|
The behavior of invoking this function when timestamps are not initialized
|
|
is undefined
|
|
|
|
@return A timestamp which can later be passed to RedOsTimePassed() to
|
|
determine the amount of time which passed between the two calls.
|
|
*/
|
|
REDTIMESTAMP RedOsTimestamp(void)
|
|
{
|
|
return xTaskGetTickCount();
|
|
}
|
|
|
|
|
|
/** @brief Determine how much time has passed since a timestamp was retrieved.
|
|
|
|
The behavior of invoking this function when timestamps are not initialized
|
|
is undefined.
|
|
|
|
@param tsSince A timestamp acquired earlier via RedOsTimestamp().
|
|
|
|
@return The number of microseconds which have passed since @p tsSince.
|
|
*/
|
|
uint64_t RedOsTimePassed(
|
|
REDTIMESTAMP tsSince)
|
|
{
|
|
/* This works even if the tick count has wrapped around, provided it has
|
|
only wrapped around once.
|
|
*/
|
|
uint32_t ulTicksPassed = (uint32_t)xTaskGetTickCount() - tsSince;
|
|
uint64_t ullMicrosecs = (uint64_t)ulTicksPassed * MICROSECS_PER_TICK;
|
|
|
|
return ullMicrosecs;
|
|
}
|
|
|