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136 lines
5.2 KiB
136 lines
5.2 KiB
/******************************************************************************** |
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* sched/clock_time2ticks.c |
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* |
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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********************************************************************************/ |
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/******************************************************************************** |
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* Included Files |
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********************************************************************************/ |
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#include <nuttx/config.h> |
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#include <stdint.h> |
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#include <time.h> |
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#include "clock_internal.h" |
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/******************************************************************************** |
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* Definitions |
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********************************************************************************/ |
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/******************************************************************************** |
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* Private Type Declarations |
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********************************************************************************/ |
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/******************************************************************************** |
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* Global Variables |
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********************************************************************************/ |
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/******************************************************************************** |
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* Private Variables |
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********************************************************************************/ |
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/******************************************************************************** |
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* Private Functions |
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********************************************************************************/ |
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/******************************************************************************** |
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* Public Functions |
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********************************************************************************/ |
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/******************************************************************************** |
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* Name: clock_time2ticks |
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* |
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* Description: |
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* Convert a timespec delay to system timer ticks. This function is suitable |
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* for calculating relative time delays and does not depend on the other |
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* clock_* logic. |
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* |
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* Parameters: |
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* reltime - Convert this relative time to system clock ticks. |
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* ticks - Return the converted number of ticks here. |
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* |
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* Return Value: |
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* Always returns OK |
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* |
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* Assumptions: |
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* |
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********************************************************************************/ |
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int clock_time2ticks(FAR const struct timespec *reltime, FAR int *ticks) |
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{ |
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#ifdef CONFIG_HAVE_LONG_LONG |
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int64_t relnsec; |
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/* Convert the relative time into nanoseconds. The range of the int64_t is |
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* sufficiently large that there is no real need for range checking. |
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*/ |
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relnsec = (int64_t)reltime->tv_sec * NSEC_PER_SEC + |
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(int64_t)reltime->tv_nsec; |
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/* Convert nanoseconds to clock ticks, rounding up to the smallest integer |
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* that is greater than or equal to the exact number of tick. |
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*/ |
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*ticks = (int)((relnsec + NSEC_PER_TICK - 1) / NSEC_PER_TICK); |
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return OK; |
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#else |
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int32_t relusec; |
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/* This function uses an int32_t to only the relative time in microseconds. |
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* that means that the maximum supported relative time is 2,147,487.647 |
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* seconds |
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*/ |
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#if 0 // overkill |
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DEBUGASSERT(reltime->tv_sec < 2147487 || |
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reltime->tv_sec == 2147487 && |
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reltime->tv_nsec <= 647 * NSEC_PER_MSEC); |
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#endif |
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/* Convert the relative time into microseconds, rounding up to the smallest |
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* value that is greater than or equal to the exact number of microseconds. |
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*/ |
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relusec = reltime->tv_sec * USEC_PER_SEC + |
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(reltime->tv_nsec + NSEC_PER_USEC - 1) / NSEC_PER_USEC; |
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/* Convert microseconds to clock ticks, rounding up to the smallest integer |
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* that is greater than or equal to the exact number of tick. |
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*/ |
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*ticks = (int)((relusec + USEC_PER_TICK - 1) / USEC_PER_TICK); |
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return OK; |
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#endif |
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}
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