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Diffstat (limited to 'nuttx/sched/clock_time2ticks.c')
-rw-r--r-- | nuttx/sched/clock_time2ticks.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/nuttx/sched/clock_time2ticks.c b/nuttx/sched/clock_time2ticks.c new file mode 100644 index 000000000..383264d51 --- /dev/null +++ b/nuttx/sched/clock_time2ticks.c @@ -0,0 +1,102 @@ +/******************************************************************************** + * sched/clock_time2ticks.c + * + * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ********************************************************************************/ + +/******************************************************************************** + * Included Files + ********************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> +#include <time.h> + +#include "clock_internal.h" + +/******************************************************************************** + * Definitions + ********************************************************************************/ + +/******************************************************************************** + * Private Type Declarations + ********************************************************************************/ + +/******************************************************************************** + * Global Variables + ********************************************************************************/ + +/******************************************************************************** + * Private Variables + ********************************************************************************/ + +/******************************************************************************** + * Private Functions + ********************************************************************************/ + +/******************************************************************************** + * Public Functions + ********************************************************************************/ + +/******************************************************************************** + * Name: clock_time2ticks + * + * Description: + * Convert a timespec delay to system timer ticks. This function is suitable + * for calculating relative time delays and does not depend on the other + * clock_* logic. + * + * Parameters: + * reltime - Convert this relative time to system clock ticks. + * ticks - Return the converted number of ticks here. + * + * Return Value: + * Always returns OK + * + * Assumptions: + * + ********************************************************************************/ + +int clock_time2ticks(FAR const struct timespec *reltime, FAR int *ticks) +{ + int32_t relusec; + + /* Convert the relative time into microseconds.*/ + + relusec = reltime->tv_sec * USEC_PER_SEC + reltime->tv_nsec / NSEC_PER_USEC; + + /* Convert microseconds to clock ticks */ + + *ticks = relusec / USEC_PER_TICK; + return OK; +} |