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;
; Oliver Schmidt, 16.8.2018
;
; Common stuff for the clock routines
;
.include "c128.inc"
.include "get_tv.inc"
.export TM, load_tenth
.constructor inittime
.importzp sreg
.import _get_tv
;----------------------------------------------------------------------------
.code
.proc load_tenth
lda #<(100 * 1000 * 1000 / $10000)
ldx #>(100 * 1000 * 1000 / $10000)
sta sreg
stx sreg+1
lda #<(100 * 1000 * 1000)
ldx #>(100 * 1000 * 1000)
rts
.endproc
;----------------------------------------------------------------------------
; Constructor that writes to the 1/10 sec register of the TOD to kick it
; into action. If this is not done, the clock hangs. We will read the register
; and write it again, ignoring a possible change in between.
.segment "ONCE"
.proc inittime
lda CIA1_TOD10
sta CIA1_TOD10
jsr _get_tv
cmp #TV::PAL
bne @60Hz
lda CIA1_CRA
ora #$80
sta CIA1_CRA
@60Hz: rts
.endproc
;----------------------------------------------------------------------------
; TM struct with date set to 1970-01-01
.data
TM: .word 0 ; tm_sec
.word 0 ; tm_min
.word 0 ; tm_hour
.word 1 ; tm_mday
.word 0 ; tm_mon
.word 70 ; tm_year
.word 0 ; tm_wday
.word 0 ; tm_yday
.word 0 ; tm_isdst
|
