timing.c
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- /**************************************************************************************
- * Fixed-point MP3 decoder
- * Jon Recker (jrecker@real.com), Ken Cooke (kenc@real.com)
- * June 2003
- *
- * timing.c - implementations of CPU timing functions
- **************************************************************************************/
- #include "timing.h"
- /* NOTES:
- * - for armulator (ARM_ADS) use -clock 100 (100 Hz system clock) for accurate
- * timing since CLOCKS_PER_SEC = 100 (this only works for zero wait-state
- * memory unless you adjust memory timings accordingly)
- * - other option for armulator is to simulate accurate hardware timers (see below)
- */
- #if (defined (_WIN32) && !defined (_WIN32_WCE)) || defined (ARM_ADS) || (defined (__GNUC__) && defined (ARM))
- #include <time.h>
- int InitTimer(void)
- {
- return 0;
- }
- UINT ReadTimer(void)
- {
- return clock();
- }
- int FreeTimer(void)
- {
- return 0;
- }
- UINT GetClockFrequency(void)
- {
- return CLOCKS_PER_SEC;
- }
- UINT GetClockDivFactor(void)
- {
- return 1;
- }
- UINT CalcTimeDifference(UINT startTime, UINT endTime)
- {
- /* timer counts up on x86, 32-bit counter */
- if (endTime < startTime)
- return (0x7fffffff - (startTime - endTime) );
- else
- return (endTime - startTime);
- }
- #elif defined (_WIN32) && defined (_WIN32_WCE)
- #include <windows.h>
- int InitTimer(void)
- {
- return 0;
- }
- UINT ReadTimer(void)
- {
- return GetTickCount();
- }
- int FreeTimer(void)
- {
- return 0;
- }
- UINT GetClockFrequency(void)
- {
- return 1000;
- }
- UINT GetClockDivFactor(void)
- {
- return 1;
- }
- UINT CalcTimeDifference(UINT startTime, UINT endTime)
- {
- /* timer counts up on x86, 32-bit counter */
- if (endTime < startTime)
- return (0x7fffffff - (startTime - endTime) );
- else
- return (endTime - startTime);
- }
- #elif 0 /* if defined ARM_ADS - this uses simulated high-res hardware timers */
- /* see definitions in ADSv1_2/bin/peripherals.ami */
- #define TIMER_BASE 0x0a800000
- #define TIMER_VALUE_1 (TIMER_BASE + 0x04)
- #define TIMER_CONTROL_1 (TIMER_BASE + 0x08)
- int InitTimer(void)
- {
- volatile unsigned int *timerControl1 = (volatile unsigned int *)TIMER_CONTROL_1;
- unsigned int control1;
-
- /* see ARMulator Reference, pg 4-78
- * bits [3:2] = clock divisor factor (00 = 1, 01 = 16, 10 = 256, 11 = undef)
- * bit [6] = free-running mode (0) or periodic mode (1)
- * bit [7] = timer disabled (0) or enabled (1)
- */
- control1 = 0x00000088;
- *timerControl1 = control1;
-
- return 0;
- }
- UINT ReadTimer(void)
- {
- volatile unsigned int *timerValue1 = (volatile unsigned int *)TIMER_VALUE_1;
- unsigned int value;
-
- value = *timerValue1 & 0x0000ffff;
-
- return (UINT)value;
- }
- int FreeTimer(void)
- {
- return 0;
- }
- UINT GetClockFrequency(void)
- {
- return 0;
- }
- UINT GetClockDivFactor(void)
- {
- return 256;
- }
- UINT CalcTimeDifference(UINT startTime, UINT endTime)
- {
-
- /* timer counts down int ARMulator, 16-bit counter */
- if (endTime > startTime)
- return (startTime + 0x00010000 - endTime);
- else
- return (startTime - endTime);
- }
- #endif