mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-25 05:29:34 +00:00
chiptune_player: split interrupt handler to own file
This commit is contained in:
Vince Weaver
parent
f0c93935e2
commit
21d183616e
@ -36,7 +36,8 @@
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;COUNT EQU $06
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;DELTA EQU $08
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orgoff EQU $5E00 ; offset of first unpacked byte
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;UNPACK_BUFFER EQU $5E00 ; offset of first unpacked byte
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;======================
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; LZ4 decode
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@ -54,9 +55,9 @@ lz4_decode:
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adc LZ4_END+1
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sta LZ4_END+1
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lda #>orgoff ; original unpacked data offset
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lda #>UNPACK_BUFFER ; original unpacked data offset
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sta LZ4_DST+1
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lda #<orgoff
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lda #<UNPACK_BUFFER
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sta LZ4_DST
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unpmain:
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@ -33,7 +33,7 @@ chiptune_player.o: chiptune_player.s \
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../asm_routines/mockingboard.s \
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../asm_routines/dos33_routines.s \
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../asm_routines/lz4_decode.s \
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rasterbars.s volume_bars.s \
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rasterbars.s volume_bars.s interrupt_handler.s \
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chip_title.inc zp.inc
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ca65 -o chiptune_player.o chiptune_player.s -l chiptune_player.lst
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@ -3,7 +3,7 @@
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.include "zp.inc"
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; program is ~4k, so from 0xc00 to 0x1C00
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LZ4_BUFFER EQU $1C00 ; $1C00 - $5C00, 16k for now
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CHUNK_BUFFER EQU $5E00 ; $5E00 - $9600, 14k, $3800
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UNPACK_BUFFER EQU $5E00 ; $5E00 - $9600, 14k, $3800
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; trying not to hit DOS at $9600
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; Reserve 3 chunks plus spare (14k)
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CHUNKSIZE EQU $3
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@ -126,9 +126,9 @@ mockingboard_found:
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jsr new_song
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lda #<CHUNK_BUFFER ; set input pointer
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lda #<UNPACK_BUFFER ; set input pointer
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sta INL
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lda #>CHUNK_BUFFER
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lda #>UNPACK_BUFFER
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sta INH
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@ -196,167 +196,8 @@ done_play:
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forever_loop:
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jmp forever_loop
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;=============================
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;=============================
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; simple interrupt handler
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;=============================
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;=============================
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; On Apple II/6502 the interrupt handler jumps to address in 0xfffe
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; This is in the ROM, which saves the registers
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; on older IIe it saved A to $45 (which could mess with DISK II)
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; newer IIe doesn't do that.
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; It then calculates if it is a BRK or not (which trashes A)
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; Then it sets up the stack like an interrupt and calls 0x3fe
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interrupt_handler:
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pha ; save A ; 3
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; tya
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; pha
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; txa
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; pha
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; Should we save X and Y too?
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; inc $0404 ; debug
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bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
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;============
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; 7
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;=====================
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; Update time counter
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;=====================
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inc FRAME_COUNT ; 5
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lda FRAME_COUNT ; 3
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cmp #50 ; 3
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bne frame_good ; 3/2nt
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lda #$0 ; 2
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sta FRAME_COUNT ; 3
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update_second_ones:
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inc $7d0+17 ; 6
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inc $bd0+17 ; 6
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lda $bd0+17 ; 4
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cmp #$ba ; one past '9' ; 2
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bne frame_good ; 3/2nt
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lda #'0'+$80 ; 2
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sta $7d0+17 ; 4
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sta $bd0+17 ; 4
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update_second_tens:
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inc $7d0+16 ; 6
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inc $bd0+16 ; 6
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lda $bd0+16 ; 4
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cmp #$b6 ; 6 (for 60 seconds) ; 2
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bne frame_good ; 3/2nt
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lda #'0'+$80 ; 2
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sta $7d0+16 ; 4
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sta $bd0+16 ; 4
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update_minutes:
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inc $7d0+14 ; 6
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inc $bd0+14 ; 6
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; we don't handle > 9:59 songs yet
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;=============
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; 90 worst
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frame_good:
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ldy MB_FRAME_DIFF ; get chunk offset ; 3
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ldx #0 ; set up reg count ; 2
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;=============
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; 5
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mb_write_loop:
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lda (INL),y ; load register value ; 5
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; if REG==1 and high bit set
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; then end of song
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bpl mb_not_done ; 3/2nt
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cpx #1 ; 2
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bne mb_not_done ; 3/2nt
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lda #1 ; set done playing ; 2
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sta DONE_PLAYING ; 3
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jmp done_interrupt ; 3
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mb_not_done:
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; special case R13. If it is 0xff, then don't update
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; otherwise might spuriously reset the envelope settings
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cpx #13 ; 2
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bne mb_not_13 ; 3/2nt
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cmp #$ff ; 2
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beq skip_r13 ; 3/2nt
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mb_not_13:
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sta MB_VALUE ; 3
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; always write out all to zero page
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; we mostly care about vola/volb/volc so this wastes 11 bytes of RAM
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; code is simpler, and save on three cmp/branches per loop
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and #$f ; 2
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sta REGISTER_DUMP,X ; 4
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; INLINE this (could save 72 cycles)
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jsr write_ay_both ; assume 3 channel (not six) ; 6
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; so write same to both
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; left/right
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; 53
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clc ; point to next interleaved ; 2
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lda INH ; page by adding $300 ; 3
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adc #CHUNKSIZE ; 2
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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_write_loop ; otherwise, loop ; 3/2nt
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;============
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; roughly 95?
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; *13= 1235?
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skip_r13:
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inc MB_FRAME_DIFF ; increment offset ; 5
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bne reset_chunk ; if not zero, done ; 3/2nt
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wraparound:
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inc MB_CHUNK ; go to next chunk ; 5
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lda MB_CHUNK ; 3
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cmp #CHUNKSIZE ; have we reached end? ; 2
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bne reset_chunk ; 3/2nt
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lda #0 ; if so reset ; 2
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sta MB_CHUNK ; 3
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; can't tail call as need to restore stack and rti
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jsr next_subsong ; and decompress next ; 6
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reset_chunk:
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lda MB_CHUNK ; reset input pointer ; 3
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clc ; to the beginning ; 2
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adc #>CHUNK_BUFFER ; in proper chunk (1 of 3) ; 2
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sta INH ; 3
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;============
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; 18
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done_interrupt:
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pla ; restore a ; 4
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rti ; return from interrupt ; 6
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;============
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; typical
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; 1358 cycles
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;=================
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; load a new song
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@ -526,13 +367,13 @@ bloop22:
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; DST: chunk_buffer+$2A00+(COPY_OFFSET*256)
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page_copy:
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clc ; 2
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lda #>(CHUNK_BUFFER+512) ; 3
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lda #>(UNPACK_BUFFER+512) ; 3
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adc COPY_OFFSET ; 3
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adc COPY_OFFSET ; 3
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adc COPY_OFFSET ; 3
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sta page_copy_loop+2 ; self modify ; 5
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lda #>(CHUNK_BUFFER+$2A00) ; 2
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lda #>(UNPACK_BUFFER+$2A00) ; 2
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adc COPY_OFFSET ; 3
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sta page_copy_loop+5 ; self modify ; 5
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@ -581,6 +422,7 @@ krw_file:
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.include "../asm_routines/lz4_decode.s"
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.include "rasterbars.s"
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.include "volume_bars.s"
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.include "interrupt_handler.s"
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;=========
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; strings
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158
chiptune_player/interrupt_handler.s
Normal file
158
chiptune_player/interrupt_handler.s
Normal file
@ -0,0 +1,158 @@
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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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; On Apple II/6502 the interrupt handler jumps to address in 0xfffe
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; This is in the ROM, which saves the registers
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; on older IIe it saved A to $45 (which could mess with DISK II)
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; newer IIe doesn't do that.
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; It then calculates if it is a BRK or not (which trashes A)
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; Then it sets up the stack like an interrupt and calls 0x3fe
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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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; inc $0404 ; debug
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bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
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;============
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; 7
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;=====================
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; Update time counter
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;=====================
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inc FRAME_COUNT ; 5
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lda FRAME_COUNT ; 3
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cmp #50 ; 3
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bne frame_good ; 3/2nt
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lda #$0 ; 2
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sta FRAME_COUNT ; 3
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update_second_ones:
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inc $7d0+17 ; 6
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inc $bd0+17 ; 6
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lda $bd0+17 ; 4
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cmp #$ba ; one past '9' ; 2
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bne frame_good ; 3/2nt
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lda #'0'+$80 ; 2
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sta $7d0+17 ; 4
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sta $bd0+17 ; 4
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update_second_tens:
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inc $7d0+16 ; 6
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inc $bd0+16 ; 6
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lda $bd0+16 ; 4
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cmp #$b6 ; 6 (for 60 seconds) ; 2
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bne frame_good ; 3/2nt
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lda #'0'+$80 ; 2
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sta $7d0+16 ; 4
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sta $bd0+16 ; 4
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update_minutes:
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inc $7d0+14 ; 6
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inc $bd0+14 ; 6
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; we don't handle > 9:59 songs yet
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;=============
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; 90 worst
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frame_good:
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ldy MB_FRAME_DIFF ; get chunk offset ; 3
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ldx #0 ; set up reg count ; 2
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;=============
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; 5
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mb_write_loop:
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lda (INL),y ; load register value ; 5
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; if REG==1 and high bit set
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; then end of song
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bpl mb_not_done ; 3/2nt
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cpx #1 ; 2
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bne mb_not_done ; 3/2nt
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lda #1 ; set done playing ; 2
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sta DONE_PLAYING ; 3
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jmp done_interrupt ; 3
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mb_not_done:
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; special case R13. If it is 0xff, then don't update
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; otherwise might spuriously reset the envelope settings
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cpx #13 ; 2
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bne mb_not_13 ; 3/2nt
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cmp #$ff ; 2
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beq skip_r13 ; 3/2nt
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mb_not_13:
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sta MB_VALUE ; 3
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; always write out all to zero page
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; we mostly care about vola/volb/volc so this wastes 11 bytes of RAM
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; code is simpler, and save on three cmp/branches per loop
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and #$f ; 2
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sta REGISTER_DUMP,X ; 4
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; INLINE this (could save 72 cycles)
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jsr write_ay_both ; assume 3 channel (not six) ; 6
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; so write same to both
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; left/right
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; 53
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clc ; point to next interleaved ; 2
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lda INH ; page by adding $300 ; 3
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adc #CHUNKSIZE ; 2
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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_write_loop ; otherwise, loop ; 3/2nt
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;============
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; roughly 95?
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; *13= 1235?
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skip_r13:
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inc MB_FRAME_DIFF ; increment offset ; 5
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bne reset_chunk ; if not zero, done ; 3/2nt
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wraparound:
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inc MB_CHUNK ; go to next chunk ; 5
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lda MB_CHUNK ; 3
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cmp #CHUNKSIZE ; have we reached end? ; 2
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bne reset_chunk ; 3/2nt
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lda #0 ; if so reset ; 2
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sta MB_CHUNK ; 3
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; can't tail call as need to restore stack and rti
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jsr next_subsong ; and decompress next ; 6
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reset_chunk:
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lda MB_CHUNK ; reset input pointer ; 3
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clc ; to the beginning ; 2
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adc #>UNPACK_BUFFER ; in proper chunk (1 of 3) ; 2
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sta INH ; 3
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;============
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; 18
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done_interrupt:
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pla ; restore a ; 4
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rti ; return from interrupt ; 6
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;============
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; typical
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; 1358 cycles
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