2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
8 FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
11 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
16 * Header for timer functions
27 //==========================================================================
28 // This installs the timer services and interrupts at the rate specified by
29 // count_val. If 'function' isn't 0, the function pointed to by function will
30 // be called 'freq' times per second. Should be > 19 and anything around
31 // 2-3000 is gonna start slowing down the system. Count_val should be
32 // 1,193,180 divided by your target frequency. Use 0 for the normal 18.2 Hz
35 #define TIMER_FREQUENCY 1193180
40 extern void timer_init();
41 extern void timer_close();
42 extern void timer_set_rate(int count_val);
43 extern void timer_set_function( void _far * function );
45 //==========================================================================
46 // These functions return the time since the timer was initialized in
47 // some various units. The total length of reading time varies for each
48 // one. They will roll around after they read 2^32.
49 // There are milliseconds, milliseconds times 10, milliseconds times 100,
50 // and microseconds. They time out after 1000 hrs, 100 hrs, 10 hrs, and
51 // 1 hr, respectively.
53 extern fix timer_get_fixed_seconds(); // Rolls about every 9 hours...
55 extern fix timer_get_fixed_secondsX(); // Assume interrupts already disabled
56 extern fix timer_get_approx_seconds(); // Returns time since program started... accurate to 1/120th of a second
57 extern void timer_set_joyhandler( void (*joy_handler)() );
59 #define timer_get_fixed_secondsX timer_get_fixed_seconds
60 //#define timer_get_approx_seconds timer_get_fixed_seconds
61 extern fix timer_get_approx_seconds();
64 //NOT_USED extern unsigned int timer_get_microseconds();
65 //NOT_USED extern unsigned int timer_get_milliseconds100();
66 //NOT_USED extern unsigned int timer_get_milliseconds10();
67 //NOT_USED extern unsigned int timer_get_milliseconds();
68 //NOT_USED extern unsigned int timer_get_millisecondsX(); // Assume interrupts disabled
70 void timer_delay(fix seconds);
72 //==========================================================================
73 // Use to access the BIOS ticker... ie... i = TICKER
75 #define TICKER (timer_get_fixed_seconds())
81 #define TICKER (*(volatile int *)0x46C)
84 #include <sys/farptr.h>
85 #define TICKER _farpeekl(_dos_ds, 0x46c)
87 #define USECS_PER_READING( start, stop, frames ) (((stop-start)*54945)/frames)
91 #define approx_usec_to_fsec(usec) ((usec) >> 4)
92 #define approx_fsec_to_usec(fsec) ((fsec) << 4)
93 #define approx_msec_to_fsec(msec) ((msec) << 6)
94 #define approx_fsec_to_msec(fsec) ((fsec) >> 6)