126 lines
4.3 KiB
C
126 lines
4.3 KiB
C
/* $Id: timer.h,v 1.5 2003-02-21 04:08:48 btb Exp $ */
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/*
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* Header for timer functions
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*
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* Old Log:
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* Revision 1.8 1994/12/10 12:27:23 john
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* Added timer_get_approx_seconds.
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*
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* Revision 1.7 1994/12/10 12:10:25 john
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* Added types.h.
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*
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* Revision 1.6 1994/12/10 12:07:06 john
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* Added tick counter variable.
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*
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* Revision 1.5 1994/11/15 12:04:15 john
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* Cleaned up timer code a bit... took out unused functions
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* like timer_get_milliseconds, etc.
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*
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* Revision 1.4 1994/04/28 23:50:08 john
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* Changed calling for init_timer. Made the function that the
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* timer calls be a far function. All of this was done to make
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* our timer system compatible with the HMI sound stuff.
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*
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* Revision 1.3 1994/02/17 15:57:12 john
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* Changed key libary to C.
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*
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* Revision 1.2 1994/01/18 10:58:34 john
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* Added timer_get_fixed_seconds
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*
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* Revision 1.1 1993/07/10 13:10:41 matt
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* Initial revision
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*
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*/
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#ifndef _TIMER_H
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#define _TIMER_H
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#include "pstypes.h"
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#include "fix.h"
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//==========================================================================
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// This installs the timer services and interrupts at the rate specified by
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// count_val. If 'function' isn't 0, the function pointed to by function will
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// be called 'freq' times per second. Should be > 19 and anything around
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// 2-3000 is gonna start slowing down the system. Count_val should be
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// 1,193,180 divided by your target frequency. Use 0 for the normal 18.2 Hz
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// interrupt rate.
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#define TIMER_FREQUENCY 1193180
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#define _far
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#define __far
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#define __interrupt
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extern void timer_init();
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extern void timer_close();
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extern void timer_set_rate(int count_val);
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extern void timer_set_function( void _far * function );
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//==========================================================================
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// These functions return the time since the timer was initialized in
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// some various units. The total length of reading time varies for each
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// one. They will roll around after they read 2^32.
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// There are milliseconds, milliseconds times 10, milliseconds times 100,
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// and microseconds. They time out after 1000 hrs, 100 hrs, 10 hrs, and
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// 1 hr, respectively.
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extern fix timer_get_fixed_seconds(); // Rolls about every 9 hours...
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#ifdef __DJGPP__
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extern fix timer_get_fixed_secondsX(); // Assume interrupts already disabled
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extern fix timer_get_approx_seconds(); // Returns time since program started... accurate to 1/120th of a second
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extern void timer_set_joyhandler( void (*joy_handler)() );
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#else
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#define timer_get_fixed_secondsX timer_get_fixed_seconds
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//#define timer_get_approx_seconds timer_get_fixed_seconds
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extern fix timer_get_approx_seconds();
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#endif
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//NOT_USED extern unsigned int timer_get_microseconds();
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//NOT_USED extern unsigned int timer_get_milliseconds100();
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//NOT_USED extern unsigned int timer_get_milliseconds10();
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//NOT_USED extern unsigned int timer_get_milliseconds();
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//NOT_USED extern unsigned int timer_get_millisecondsX(); // Assume interrupts disabled
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void timer_delay(fix seconds);
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//==========================================================================
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// Use to access the BIOS ticker... ie... i = TICKER
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#ifndef __DJGPP__
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#define TICKER (timer_get_fixed_seconds())
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#endif
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#ifdef __DJGPP__
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#ifndef __GNUC__
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#define TICKER (*(volatile int *)0x46C)
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#else
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#include <go32.h>
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#include <sys/farptr.h>
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#define TICKER _farpeekl(_dos_ds, 0x46c)
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#endif
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#define USECS_PER_READING( start, stop, frames ) (((stop-start)*54945)/frames)
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#endif
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#define approx_usec_to_fsec(usec) ((usec) >> 4)
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#define approx_fsec_to_usec(fsec) ((fsec) << 4)
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#define approx_msec_to_fsec(msec) ((msec) << 6)
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#define approx_fsec_to_msec(fsec) ((fsec) >> 6)
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#endif
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