mirror of https://github.com/cc65/cc65.git
41 lines
1.1 KiB
ArmAsm
41 lines
1.1 KiB
ArmAsm
;
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; 2019-12-27, Greg King
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;
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; Common stuff for the clock routines
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;
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.export TM, load_jiffy
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.importzp sreg
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;----------------------------------------------------------------------------
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; Load .EAX with the approximate number of nanoseconds
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; in one jiffy (1/60th of a second).
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.proc load_jiffy
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lda #<(17 * 1000 * 1000 / $10000)
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ldx #>(17 * 1000 * 1000 / $10000)
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sta sreg
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stx sreg+1
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lda #<(17 * 1000 * 1000)
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ldx #>(17 * 1000 * 1000)
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rts
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.endproc
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;----------------------------------------------------------------------------
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; TM struct with "is daylight-saving time" set to "unknown"
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.data
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TM: .word 0 ; tm_sec
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.word 0 ; tm_min
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.word 0 ; tm_hour
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.word 0 ; tm_mday
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.word 0 ; tm_mon
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.word 0 ; tm_year
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.word 0 ; tm_wday
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.word 0 ; tm_yday
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.word .loword(-1) ; tm_isdst
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