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32 lines
581 B
ArmAsm
32 lines
581 B
ArmAsm
;
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; clock.s
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;
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; Written by Groepaz/Hitmen <groepaz@gmx.net>
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; Cleanup by Ullrich von Bassewitz <uz@cc65.org>
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; 2003-05-02, Greg King <gngking@erols.com>
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;
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; #include <time.h>
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;
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; clock_t clock (void);
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;
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.include "nes.inc"
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.export _clock
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.importzp sreg
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.proc _clock
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ldy #0 ; High word is always zero
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sty sreg+1
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sty sreg
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L1: ldx tickcount+1
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lda tickcount
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cpx tickcount+1 ; Did tickcount change?
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bne L1 ; Yes, re-read it
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rts
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.endproc
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