43 lines
687 B
ArmAsm
43 lines
687 B
ArmAsm
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; Ullrich von Bassewitz, 25.07.2000
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; Implemented using information from Sidney Cadot <sidney@janis.pds.twi.tudelft.nl>
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;
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; clock_t clock (void);
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; unsigned _clocks_per_sec (void);
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;
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.export _clock, __clocks_per_sec
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.importzp sreg
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.include "atari.inc"
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.proc _clock
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lda #0 ; Byte 3 is always zero
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sta sreg+1
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php ; Save current I flag value
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sei ; Disable interrupts
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lda RTCLOK+2
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sta sreg
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lda RTCLOK ; Read clock
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ldx RTCLOK+1
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plp ; Restore old I bit
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rts
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.endproc
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.proc __clocks_per_sec
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lda #50 ; Assume PAL
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ldx PAL ; use hw register, PALNTS is only supported on XL/XE ROM
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beq @L1
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ldx #0
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lda #60
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@L1: rts
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.endproc
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