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/****************************************************************************
*
* Ultra Long Period Timer
*
* ========================================================================
*
* The contents of this file are subject to the SciTech MGL Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.scitechsoft.com/mgl-license.txt
*
* Software distributed under the License is distributed on an
* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
*
* The Initial Developer of the Original Code is SciTech Software, Inc.
* All Rights Reserved.
*
* ========================================================================
*
* Language: ANSI C
* Environment: *** TODO: ADD YOUR OS ENVIRONMENT NAME HERE ***
*
* Description: Module to implement OS specific services to measure the
* CPU frequency.
*
****************************************************************************/
#include <OS.h>
/*----------------------------- Implementation ----------------------------*/
/****************************************************************************
REMARKS:
Increase the thread priority to maximum, if possible.
****************************************************************************/
static int SetMaxThreadPriority(void)
{
thread_id thid = find_thread(NULL);
thread_info tinfo;
get_thread_info(thid, &tinfo);
set_thread_priority(thid, B_REAL_TIME_PRIORITY);
return tinfo.priority;
}
/****************************************************************************
REMARKS:
Restore the original thread priority.
****************************************************************************/
static void RestoreThreadPriority(
int priority)
{
thread_id thid = find_thread(NULL);
set_thread_priority(thid, priority);
}
/****************************************************************************
REMARKS:
Initialise the counter and return the frequency of the counter.
****************************************************************************/
static void GetCounterFrequency(
CPU_largeInteger *freq)
{
/* TODO: Return the frequency of the counter in here. You should try to */
/* normalise this value to be around 100,000 ticks per second. */
freq->low = 1000000;
freq->high = 0;
}
/****************************************************************************
REMARKS:
Read the counter and return the counter value.
TODO: Implement this to read the counter. It should be done as a macro
for accuracy.
****************************************************************************/
#define GetCounter(t) { *((bigtime_t*) t) = system_time(); }
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