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68 lines
1.7 KiB
ArmAsm
68 lines
1.7 KiB
ArmAsm
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; Oliver Schmidt, 16.8.2018
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;
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; Common stuff for the clock routines
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;
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.include "c64.inc"
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.include "get_tv.inc"
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.export TM, load_tenth
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.constructor inittime
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.importzp sreg
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.import _get_tv, _get_ostype
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;----------------------------------------------------------------------------
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.code
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.proc load_tenth
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lda #<(100 * 1000 * 1000 / $10000)
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ldx #>(100 * 1000 * 1000 / $10000)
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sta sreg
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stx sreg+1
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lda #<(100 * 1000 * 1000)
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ldx #>(100 * 1000 * 1000)
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rts
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.endproc
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;----------------------------------------------------------------------------
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; Constructor that writes to the 1/10 sec register of the TOD to kick it
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; into action. If this is not done, the clock hangs. We will read the register
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; and write it again, ignoring a possible change in between.
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.segment "ONCE"
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.proc inittime
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lda CIA1_TOD10
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sta CIA1_TOD10
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jsr _get_tv
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cmp #TV::PAL
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bne @60Hz
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jsr _get_ostype
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cmp #$43
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beq @60Hz
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lda CIA1_CRA
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ora #$80
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sta CIA1_CRA
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@60Hz: rts
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.endproc
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;----------------------------------------------------------------------------
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; TM struct with date set to 1970-01-01
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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 1 ; tm_mday
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.word 0 ; tm_mon
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.word 70 ; tm_year
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.word 0 ; tm_wday
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.word 0 ; tm_yday
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.word 0 ; tm_isdst
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