95 lines
1.7 KiB
ArmAsm
95 lines
1.7 KiB
ArmAsm
;============================
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; wait for music pattern
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; also check for keypress
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;============================
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; pattern # in A
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wait_for_pattern:
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cmp current_pattern_smc+1
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bcc done_check_pattern_done ; blt
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beq done_check_pattern_done ; ble
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lda KEYPRESS
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bpl done_check_pattern_notdone
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bit KEYRESET
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jmp done_check_pattern_done
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;============================
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; setup timeout of A seconds
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;============================
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setup_timeout:
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sta SECOND_COUNTDOWN
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lda #0
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sta IRQ_COUNTDOWN
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rts
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;===========================
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; countodown second timeout
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; also check for keypress
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;===========================
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; carry set = done
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check_timeout:
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; check keyboard first
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lda KEYPRESS
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bpl timeout_not_keypress
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bit KEYRESET
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; lda #0 ; reset, is this necessary?
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; sta IRQ_COUNTDOWN
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; sta SECOND_COUNTDOWN
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jmp done_check_timeout_done
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timeout_not_keypress:
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lda IRQ_COUNTDOWN
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bne done_check_timeout_notdone
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irq_countdown_zero:
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lda SECOND_COUNTDOWN
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beq done_check_timeout_done
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; otherwise we need to decrement and update
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dec SECOND_COUNTDOWN
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lda #50
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sta IRQ_COUNTDOWN
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done_check_pattern_notdone:
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done_check_timeout_notdone:
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clc
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rts
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done_check_pattern_done:
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done_check_timeout_done:
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sec
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rts
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;==========================
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; busy wait A * 1 50Hz tick
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;==========================
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wait_ticks:
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sta IRQ_COUNTDOWN
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wait_tick_loop:
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lda IRQ_COUNTDOWN
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bne wait_tick_loop
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wait_tick_done:
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rts
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;====================
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; busy wait A seconds
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;====================
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; exit early if key pressed
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wait_seconds:
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tax
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wait_seconds_loop:
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lda #50 ; wait 1s
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jsr wait_ticks
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lda KEYPRESS
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bmi wait_seconds_done
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dex
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bpl wait_seconds_loop
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wait_seconds_done:
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bit KEYRESET
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rts
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