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chiptune_bare: still shows bug

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This commit is contained in:
Vince Weaver 2018-06-11 16:59:56 -04:00
parent b516b60f51
commit 4e82142cef
1 changed files with 125 additions and 38 deletions
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163
chiptune_debug/chiptune_bare.s
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@ -6,13 +6,6 @@
; Setup
;=============================
; init variables
lda #0
sta DONE_PLAYING
sta MB_CHUNK_OFFSET
;============================
; Init the Mockingboard
;============================
@ -58,28 +51,6 @@
; load first song
;==================
jsr new_song
;============================
; Enable 6502 interrupts
;============================
cli ; clear interrupt mask
;============================
; Loop forever
;============================
main_loop:
jmp main_loop
;=================
; load a new song
;=================
new_song:
;=========================
; Init Variables
;=========================
@ -103,12 +74,134 @@ new_song:
lda #$3
sta CHUNKSIZE
rts
;============================
; Enable 6502 interrupts
;============================
cli ; clear interrupt mask
;============================
; Loop forever
;============================
main_loop:
jmp main_loop
;=========
;routines
;=========
.include "mockingboard_a.s"
; left speaker
MOCK_6522_ORB1 EQU $C400 ; 6522 #1 port b data
MOCK_6522_ORA1 EQU $C401 ; 6522 #1 port a data
MOCK_6522_DDRB1 EQU $C402 ; 6522 #1 data direction port B
MOCK_6522_DDRA1 EQU $C403 ; 6522 #1 data direction port A
; right speaker
MOCK_6522_ORB2 EQU $C480 ; 6522 #2 port b data
MOCK_6522_ORA2 EQU $C481 ; 6522 #2 port a data
MOCK_6522_DDRB2 EQU $C482 ; 6522 #2 data direction port B
MOCK_6522_DDRA2 EQU $C483 ; 6522 #2 data direction port A
; AY-3-8910 commands on port B
; RESET BDIR BC1
MOCK_AY_RESET EQU $0 ; 0 0 0
MOCK_AY_INACTIVE EQU $4 ; 1 0 0
MOCK_AY_READ EQU $5 ; 1 0 1
MOCK_AY_WRITE EQU $6 ; 1 1 0
MOCK_AY_LATCH_ADDR EQU $7 ; 1 1 1
;========================
; Mockingboard Init
;========================
; Initialize the 6522s
; set the data direction for all pins of PortA/PortB to be output
mockingboard_init:
lda #$ff ; all output (1)
sta MOCK_6522_DDRB1
sta MOCK_6522_DDRA1
sta MOCK_6522_DDRB2
sta MOCK_6522_DDRA2
rts
;======================
; Reset Left AY-3-8910
;======================
reset_ay_both:
lda #MOCK_AY_RESET
sta MOCK_6522_ORB1
lda #MOCK_AY_INACTIVE
sta MOCK_6522_ORB1
;======================
; Reset Right AY-3-8910
;======================
;reset_ay_right:
lda #MOCK_AY_RESET
sta MOCK_6522_ORB2
lda #MOCK_AY_INACTIVE
sta MOCK_6522_ORB2
rts
; Write sequence
; Inactive -> Latch Address -> Inactive -> Write Data -> Inactive
;=========================================
; Write Right/Left to save value AY-3-8910
;=========================================
; register in X
; value in MB_VALUE
write_ay_both:
; address
stx MOCK_6522_ORA1 ; put address on PA1 ; 3
stx MOCK_6522_ORA2 ; put address on PA2 ; 3
lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
sta MOCK_6522_ORB1 ; latch_address on PB1 ; 3
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 3
lda #MOCK_AY_INACTIVE ; go inactive ; 2
sta MOCK_6522_ORB1 ; 3
sta MOCK_6522_ORB2 ; 3
; value
lda MB_VALUE ; 3
sta MOCK_6522_ORA1 ; put value on PA1 ; 3
sta MOCK_6522_ORA2 ; put value on PA2 ; 3
lda #MOCK_AY_WRITE ; ; 2
sta MOCK_6522_ORB1 ; write on PB1 ; 3
sta MOCK_6522_ORB2 ; write on PB2 ; 3
lda #MOCK_AY_INACTIVE ; go inactive ; 2
sta MOCK_6522_ORB1 ; 3
sta MOCK_6522_ORB2 ; 3
rts ; 6
;===========
; 53
;=======================================
; clear ay -- clear all 14 AY registers
; should silence the card
;=======================================
clear_ay_both:
ldx #14
lda #0
sta MB_VALUE
clear_ay_left_loop:
jsr write_ay_both
dex
bpl clear_ay_left_loop
rts
;================================
@ -121,10 +214,7 @@ interrupt_handler:
pha ; save A ; 3
; Should we save X and Y too?
.ifdef NOIRQ
.else
bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
.endif
mb_play_music:
@ -267,11 +357,8 @@ increment_offset:
done_interrupt:
pla ; restore a ; 4
.ifdef NOIRQ
rts
.else
rti ; return from interrupt ; 6
.endif
REGISTER_OLD:
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0