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