mirror of
https://github.com/deater/dos33fsprogs.git
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416 lines
6.1 KiB
ArmAsm
416 lines
6.1 KiB
ArmAsm
; PT3 Timer -- times how long it takes
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.include "zp.inc"
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.include "hardware.inc"
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PT3_LOC = $4000
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PT3_USE_ZERO_PAGE = 1
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;=============================
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; Setup
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;=============================
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pt3_setup:
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jsr HOME
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jsr TEXT
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; Init disk code
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jsr rts_init
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; init variables
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lda #0
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sta DRAW_PAGE
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sta DONE_PLAYING
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sta WHICH_FILE
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; jsr mockingboard_detect ; call detection routine
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; bcs mockingboard_found
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mockingboard_found:
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;============================
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; Init the Mockingboard
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;============================
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jsr mockingboard_init
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jsr mockingboard_setup_interrupt
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jsr reset_ay_both
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jsr clear_ay_both
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;==================
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; load first song
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;==================
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jsr new_song
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;============================
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; Enable 6502 interrupts
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;============================
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cli ; clear interrupt mask
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;============================
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; Loop forever
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;============================
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main_loop:
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; play song as fast as possible
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jsr interrupt_simulator
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check_done:
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lda #$ff
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bit DONE_PLAYING
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beq main_loop ; if was all zeros, loop
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; right pressed
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done_play:
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sei ; disable interrupts
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; print results
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jsr CROUT
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jsr CROUT
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lda timer_seconds_h
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jsr PRBYTE
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lda timer_seconds_l
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jsr PRBYTE
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lda #'.'+$80
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jsr COUT
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lda timer_fractions
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jsr PRBYTE
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jsr CROUT
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jsr CROUT
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lda #0
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sta DONE_PLAYING
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forever_loop:
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jmp forever_loop
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;=================
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; load a new song
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;=================
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new_song:
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;=========================
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; Init Variables
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;=========================
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; ?
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;===========================
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; Load in PT3 file
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;===========================
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jsr get_filename
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; needs to be space-padded $A0 30-byte filename
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lda #<readfile_filename
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sta namlo
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lda #>readfile_filename
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sta namhi
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ldy #0
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ldx #30 ; 30 chars
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name_loop:
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lda (INL),Y
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beq space_loop
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ora #$80
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sta (namlo),Y
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iny
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dex
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bne name_loop
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beq done_name_loop
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space_loop:
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lda #$a0 ; pad with ' '
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sta (namlo),Y
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iny
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dex
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bne space_loop
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done_name_loop:
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; open and read a file
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; loads to whatever it was BSAVED at (default is $2000)
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jsr read_file ; read PT3 file from disk
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;=========================
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; Print Info
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;=========================
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; re-init, as we've run through it
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lda #0
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sta DONE_PLAYING
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jsr pt3_init_song
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rts
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;==================
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; Get filename
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;==================
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; WHICH_FILE holds number
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; MAX_FILES has max
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; Scroll through until find
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; point INH:INL to it
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get_filename:
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ldy #0
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ldx WHICH_FILE
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lda #<song_list ; point to filename
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sta INL
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lda #>song_list
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sta INH
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get_filename_loop:
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cpx #0
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beq filename_found
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inner_loop:
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iny
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lda (INL),Y
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bne inner_loop
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iny
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dex
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jmp get_filename_loop
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filename_found:
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tya
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clc
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adc INL
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sta INL
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lda INH
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adc #0
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sta INH
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rts
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;==========
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; filenames
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;==========
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song_list:
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.asciiz "SR.PT3"
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;=========
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;routines
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;=========
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.include "pt3_lib_mockingboard_setup.s"
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.include "qkumba_rts.s"
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.include "pt3_lib_core.s"
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.include "pt3_lib_init.s"
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timer_fractions: .byte $0
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timer_seconds_l: .byte $0
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timer_seconds_h: .byte $0
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;======================================
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; simply time things with a 50Hz clock
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interrupt_handler:
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; pha ; save A ; 3
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; A is saved in $45 by firmware
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txa
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pha ; save X
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tya
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pha ; save Y
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bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
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count_time:
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inc timer_fractions
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lda timer_fractions
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cmp #50 ; 50Hz
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bne done_count_time
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lda #$0
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sta timer_fractions
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inc timer_seconds_l
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bne done_count_time
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inc timer_seconds_h
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done_count_time:
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exit_interrupt_handler:
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; pla ; restore a ; 4
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pla
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tay ; restore Y
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pla
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tax ; restore X
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lda $45 ; restore A
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rti ; return from interrupt ; 6
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interrupt_simulator:
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; pha ; save A ; 3
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; A is saved in $45 by firmware
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txa
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pha ; save X
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tya
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pha ; save Y
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; bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
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bit $1234
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lda DONE_PLAYING ; 3
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beq pt3_play_music ; if song done, don't play music ; 3/2nt
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jmp check_keyboard ; 3
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;============
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; 13
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pt3_play_music:
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jsr pt3_make_frame
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lda DONE_SONG
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beq mb_write_frame
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lda #$20
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jmp quiet_exit
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;======================================
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; Write frames to Mockingboard
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;======================================
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; actually plays frame loaded at end of
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; last interrupt, so 20ms behind?
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mb_write_frame:
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ldx #0 ; set up reg count ; 2
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;============
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; 2
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;==================================
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; loop through the 14 registers
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; reading the value, then write out
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;==================================
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mb_write_loop:
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lda AY_REGISTERS,X ; load register value ; 4
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; special case R13. If it is 0xff, then don't update
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; otherwise might spuriously reset the envelope settings
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cpx #13 ; 2
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bne mb_not_13 ; 3/2nt
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cmp #$ff ; 2
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beq mb_skip_13 ; 3/2nt
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;============
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; typ 5
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mb_not_13:
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; address
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stx MOCK_6522_ORA1 ; put address on PA1 ; 4
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stx MOCK_6522_ORA2 ; put address on PA2 ; 4
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lda #MOCK_AY_LATCH_ADDR ; latch_address for PB1 ; 2
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sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
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sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
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ldy #MOCK_AY_INACTIVE ; go inactive ; 2
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sty MOCK_6522_ORB1 ; 4
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sty MOCK_6522_ORB2 ; 4
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; value
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lda AY_REGISTERS,X ; load register value ; 4
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sta MOCK_6522_ORA1 ; put value on PA1 ; 4
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sta MOCK_6522_ORA2 ; put value on PA2 ; 4
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lda #MOCK_AY_WRITE ; ; 2
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sta MOCK_6522_ORB1 ; write on PB1 ; 4
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sta MOCK_6522_ORB2 ; write on PB2 ; 4
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sty MOCK_6522_ORB1 ; 4
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sty MOCK_6522_ORB2 ; 4
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;===========
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; 60
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mb_no_write:
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inx ; point to next register ; 2
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cpx #14 ; if 14 we're done ; 2
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bmi mb_write_loop ; otherwise, loop ; 3/2nt
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;============
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; 7
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mb_skip_13:
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;=================================
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; Finally done with this interrupt
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;=================================
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done_interrupt:
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update_time:
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done_time:
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check_keyboard:
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jmp exit_interrupt
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quiet_exit:
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sta DONE_PLAYING
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jsr clear_ay_both
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exit_interrupt:
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; pla ; restore a ; 4
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pla
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tay ; restore Y
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pla
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tax ; restore X
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interrupt_smc:
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lda $45 ; restore A
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rts ; return from interrupt ; 6
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;============
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; dummy vars
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;============
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pt3_loop_smc:
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