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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
commit | e3940eb2080711edac189cca3f642ee89dc215f2 (patch) | |
tree | 1c390958fae49e34dce698b175487e6d4681e540 /nuttx/sched/clock_initialize.c | |
parent | 2223612deb2cc6322992f8595b6d6f86fcb53ae1 (diff) | |
download | px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.gz px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.bz2 px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.zip |
NuttX RTOS
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/sched/clock_initialize.c')
-rw-r--r-- | nuttx/sched/clock_initialize.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/nuttx/sched/clock_initialize.c b/nuttx/sched/clock_initialize.c new file mode 100644 index 000000000..7b63a6521 --- /dev/null +++ b/nuttx/sched/clock_initialize.c @@ -0,0 +1,128 @@ +/************************************************************ + * clock_initialize.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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 <sys/types.h> +#include <time.h> +#include <errno.h> +#include <debug.h> +#include "clock_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/************************************************************ + * Private Function Prototypes + ************************************************************/ + +/********************************************************** + * Public Constant Data + **********************************************************/ + +/************************************************************ + * Public Variables + ************************************************************/ + +volatile uint32 g_system_timer = 0; +struct timespec g_basetime = {0,0}; +uint32 g_tickbias = 0; + +/********************************************************** + * Private Variables + **********************************************************/ + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Function: clock_initialize + * + * Description: + * Perform one-time initialization of the timing facilities. + * + ************************************************************/ + +void clock_initialize(void) +{ + time_t jdn; + + /* Initialize the real time close */ + + g_system_timer = 0; + + /* Get the EPOCH-relative julian date from the calendar year, + * month, and date + */ + + jdn = clock_calendar2utc(CONFIG_START_YEAR, CONFIG_START_MONTH, + CONFIG_START_DAY); + + /* Set the base time as seconds into this julian day. */ + + g_basetime.tv_sec = jdn * (24*60*60); + g_basetime.tv_nsec = 0; + + /* These is no time bias from this time. */ + + g_tickbias = 0; +} + +/************************************************************ + * Function: clock_timer + * + * Description: + * This function must be called once every time the real + * time clock interrupt occurs. The interval of this + * clock interrupt must be MSEC_PER_TICK + * + ************************************************************/ + +void clock_timer(void) +{ + g_system_timer++; +} |