83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/* $NetBSD: rf_etimer.h,v 1.3 1999/02/05 00:06:11 oster Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/* rf_etimer.h -- header file for code related to accurate timing
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* This code currently assumes that the elapsed time between START_TIMER
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* and START_TIMER is less than the period of the cycle counter. This
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* means the events you want to time must be less than:
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* clock speed max time
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* ---------- --------
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* 175 MHz 24 sec
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* 150 MHz 28 sec
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* 125 MHz 34 sec
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*
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*
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*/
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#ifndef _RF__RF_TIMER_H_
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#define _RF__RF_TIMER_H_
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#include "rf_options.h"
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extern unsigned int rpcc(void);
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#define rf_read_cycle_counter rpcc
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#define RF_DEF_TIMER_MAX_VAL 0xFFFFFFFF
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typedef struct RF_EtimerVal_s {
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unsigned ccnt; /* cycle count */
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} RF_EtimerVal_t;
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struct RF_Etimer_s {
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RF_EtimerVal_t st;
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RF_EtimerVal_t et;
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unsigned long ticks; /* elapsed time in ticks */
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};
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extern long rf_timer_max_val;
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extern long rf_timer_ticks_per_second;
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extern unsigned long rf_timer_ticks_per_usec;
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#define RF_ETIMER_TICKS2US(_tcks_) ( (_tcks_) / rf_timer_ticks_per_usec )
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#define RF_ETIMER_START(_t_) { (_t_).st.ccnt = rf_read_cycle_counter(); }
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#define RF_ETIMER_STOP(_t_) { (_t_).et.ccnt = rf_read_cycle_counter(); }
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#define RF_ETIMER_EVAL(_t_) { \
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if ((_t_).st.ccnt < (_t_).et.ccnt) \
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(_t_).ticks = (_t_).et.ccnt - (_t_).st.ccnt; \
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else \
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(_t_).ticks = rf_timer_max_val - ((_t_).st.ccnt - (_t_).et.ccnt); \
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}
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#define RF_ETIMER_VAL_TICKS(_t_) ((_t_).ticks)
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#define RF_ETIMER_VAL_US(_t_) (RF_ETIMER_TICKS2US((_t_).ticks))
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#define RF_ETIMER_VAL_MS(_t_) (RF_ETIMER_TICKS2US((_t_).ticks)/1000)
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#endif /* !_RF__RF_TIMER_H_ */
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