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chiptune_debug: making one last try at this
This commit is contained in:
Vince Weaver
parent
b386a4f57a
commit
b516b60f51
@ -5,11 +5,12 @@ PNG2GR = ../gr-utils/png2gr
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all: chiptune_debug.dsk
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chiptune_debug.dsk: CHIPTUNE_IRQ CHIPTUNE_NOIRQ CHIPTUNE_25HZ ./sdemo.raw
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chiptune_debug.dsk: CHIPTUNE_IRQ CHIPTUNE_NOIRQ CHIPTUNE_25HZ CHIPTUNE_BARE ./sdemo.raw
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cp chiptune_empty.dsk chiptune_debug.dsk
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$(DOS33) -y chiptune_debug.dsk BSAVE -a 0x0C00 CHIPTUNE_IRQ
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$(DOS33) -y chiptune_debug.dsk BSAVE -a 0x0C00 CHIPTUNE_NOIRQ
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$(DOS33) -y chiptune_debug.dsk BSAVE -a 0x0C00 CHIPTUNE_25HZ
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$(DOS33) -y chiptune_debug.dsk BSAVE -a 0x0C00 CHIPTUNE_BARE
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CHIPTUNE_IRQ: chiptune_irq.o
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@ -40,6 +41,13 @@ chiptune_25Hz.o: chiptune_player.s \
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ca65 -D F25HZ=1 -o chiptune_25Hz.o chiptune_player.s -l chiptune_25Hz.lst
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CHIPTUNE_BARE: chiptune_bare.o
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ld65 -o CHIPTUNE_BARE chiptune_bare.o -C ../linker_scripts/apple2_c00.inc
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chiptune_bare.o: chiptune_bare.s
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ca65 -o chiptune_bare.o chiptune_bare.s -l chiptune_bare.lst
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clean:
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rm -f *~ TITLE.GR *.o *.lst \
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CHIPTUNE_PLAYER CHIPTUNE_IRQ CHIPTUNE_NOIRQ CHIPTUNE_25HZ
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281
chiptune_debug/chiptune_bare.s
Normal file
281
chiptune_debug/chiptune_bare.s
Normal file
@ -0,0 +1,281 @@
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; VMW Chiptune Player
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.include "zp.inc"
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;=============================
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; Setup
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;=============================
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; init variables
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lda #0
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sta DONE_PLAYING
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sta MB_CHUNK_OFFSET
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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 reset_ay_both
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jsr clear_ay_both
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;=========================
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; Setup Interrupt Handler
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;=========================
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; Vector address goes to 0x3fe/0x3ff
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lda #<interrupt_handler
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sta $03fe
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lda #>interrupt_handler
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sta $03ff
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;============================
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; Enable 50Hz clock on 6522
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;============================
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sei ; disable interrupts just in case
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lda #$40 ; Continuous interrupts, don't touch PB7
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sta $C40B ; ACR register
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lda #$7F ; clear all interrupt flags
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sta $C40E ; IER register (interrupt enable)
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lda #$C0
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sta $C40D ; IFR: 1100, enable interrupt on timer one oflow
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sta $C40E ; IER: 1100, enable timer one interrupt
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lda #$E7
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sta $C404 ; write into low-order latch
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lda #$4f
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sta $C405 ; write into high-order latch,
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; load both values into counter
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; clear interrupt and start counting
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; 4fe7 / 1e6 = .020s, 50Hz
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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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jmp main_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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lda #$0
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sta MB_CHUNK_OFFSET
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lda #3
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sta CHUNKSIZE
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;===========================
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; Load in KRW file
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;===========================
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lda #<UNPACK_BUFFER ; set input pointer
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sta INL
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lda #>UNPACK_BUFFER
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sta INH
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; Decompress first chunks
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lda #$3
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sta CHUNKSIZE
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rts
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;=========
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;routines
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;=========
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.include "mockingboard_a.s"
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;================================
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;================================
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; mockingboard interrupt handler
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;================================
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;================================
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interrupt_handler:
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pha ; save A ; 3
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; Should we save X and Y too?
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.ifdef NOIRQ
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.else
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bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
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.endif
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mb_play_music:
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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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; inlined "write_ay_both" to save up to 156 (12*13) cycles
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; unrolled
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mb_write_loop:
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lda REGISTER_DUMP,X ; load register value ; 4
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cmp REGISTER_OLD,X ; compare with old values ; 4
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beq mb_no_write ; 3/2nt
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;=============
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; typ 11
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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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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sta MOCK_6522_ORB2 ; 4
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; value
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lda REGISTER_DUMP,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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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sta MOCK_6522_ORB2 ; 4
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;===========
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; 62
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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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; Copy registers to old
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;=====================================
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ldx #13 ; 2
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mb_reg_copy:
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lda REGISTER_DUMP,X ; load register value ; 4
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sta REGISTER_OLD,X ; compare with old values ; 4
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dex ; 2
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bpl mb_reg_copy ; 2nt/3
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;=============
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; 171
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;===================================
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; Load all 14 registers in advance
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;===================================
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; note, assuming not cross page boundary, not any slower
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; then loading from zero page?
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mb_load_values:
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ldx #0 ; set up reg count ; 2
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ldy MB_CHUNK_OFFSET ; get chunk offset ; 3
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;=============
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; 5
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mb_load_loop:
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lda (INL),y ; load register value ; 5
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sta REGISTER_DUMP,X ; 4
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;============
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; 9
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;====================
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; point to next page
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;====================
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clc ; point to next interleaved ; 2
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lda INH ; page by adding CHUNKSIZE (3/1); 3
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adc CHUNKSIZE ; 3
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sta INH ; 3
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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_load_loop ; otherwise, loop ; 3/2nt
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;============
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; 18
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;==============================================
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; incremement offset. If 0 move to next chunk
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;==============================================
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increment_offset:
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inc MB_CHUNK_OFFSET ; increment offset ; 5
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lda #0 ; 2
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clc ; 2
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adc #>UNPACK_BUFFER ; in proper chunk 1 or 2 ; 2
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sta INH ; update r0 pointer ; 3
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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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pla ; restore a ; 4
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.ifdef NOIRQ
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rts
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.else
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rti ; return from interrupt ; 6
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.endif
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REGISTER_OLD:
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.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.align 256
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UNPACK_BUFFER:
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.incbin "sdemo.raw"
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