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Copy pathmidiplay.s
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midiplay.s
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DISPLAY_ENABLED equ 0
PANNED_NOTE_NEW equ 0
org 00f0h
defw 0500h, prgEnd - main, 0, 0, 0, 0, 0, 0
macro exos n
rst 30h
defb n
endm
main:
di
ld sp, 0100h
ld a, 0ffh
out (0b2h), a
ld hl, resetRoutine
ld (0bff8h), hl
ld hl, (0bffdh)
ld a, l
out (0b1h), a
ld a, h
out (0b2h), a
ei
ld bc, 011ah ; ST_FLAG
ld d, 0
exos 16
ld bc, 011bh ; BORD_VID
ld d, 0
exos 16
halt
halt
.l1: call restoreIRQHandler
call load_midi_file
call z, load_envelopes
di
ld hl, msg_creatingTables
call status_message
call daveInit
ld hl, msg_clear
call status_message
call midi_reset
call setIRQHandler
.l2: ei
halt
ld a, 4
out (0b5h), a
in a, (0b5h)
cpl
and 8bh
jr z, .l2
di
bit 1, a ; F8
jp nz, resetRoutine
or a
jp m, .l1 ; F1
and 08h ; F6
jr nz, .l3
call midi_stop ; F4
jr .l2
.l3: call midi_file_rewind
jr .l2
load_midi_file:
ld a, (no_file_chooser)
or a
jr nz, .l3
ld de, exdosFDCommand
exos 26
jr nz, .l2
ld hl, fileNameBuffer
push hl
ld hl, 2045h ; "E "
push hl
ld hl, 4c49h ; "IL"
push hl
ld hl, 4607h ; 7, "F"
push hl
ld hl, 0
add hl, sp
ld e, l
ld d, h
exos 26
pop hl
pop hl
pop hl
pop hl
jr nz, .l2
ld de, fileNameBuffer
.l1: ld hl, file_buf
ld bc, FILE_BUF_SIZE
jp midi_file_load
.l2: ld a, 1
ld (no_file_chooser), a
.l3: ld de, defaultMIDIFileName
jr .l1
load_envelopes:
ld a, 1
ld de, envelopeFileName
exos 1
jr nz, .l1
inc a
ld de, midi_pgm_layer2
ld bc, 1024 + 8192
exos 6
xor 0e4h ; .EOF
jr nz, .l2
ld a, c
cp low (8192 - 5)
ld a, b
sbc a, high (8192 - 5)
jr nc, .l2
ld a, 1
exos 3
ret
.l1: ld hl, errMsg_envNotFound
jp error_exit
.l2: ld hl, errMsg_envInvalid
jp error_exit
daveInit:
call testCPUFrequency ; returns with B = 0
ld a, 25
cp l ; Carry = 1 if Z80 frequency > 5 MHz
ld a, 03h
rla
rla ; Z80 <= 5 MHz: 0Ch, > 5 MHz: 0Eh
out (0bfh), a
jp dave_init
; L = 1 kHz interrupts per video frame
testCPUFrequency:
di
ld a, 04h
out (0bfh), a
xor a
ld b, a
out (0a7h), a
ld c, b
call .l1
ld l, b
.l1: in a, (0b4h)
and 11h
or c
rlca
and 66h
ld c, a ; -ON--ON-
rlca ; ON--ON--
xor c ; OXN-OXN-
bit 2, a
jr z, .l2
inc l ; 1 kHz interrupt
.l2: cp 0c0h
jr c, .l1 ; not 50 Hz interrupt ?
ret
setIRQHandler:
di
ld a, 0c3h ; = JP nn
ld hl, irqRoutine
ld (0038h), a
ld (0039h), hl
ld a, 30h ; video interrupt only
out (0b4h), a
ei
ret
restoreIRQHandler:
di
ld a, 0f5h ; = PUSH AF
ld hl, 1837h ; = SCF, JR +d
ld (0038h), a
ld (0039h), hl
ld a, 3ch ; video + 1 Hz interrupt
out (0b4h), a
ei
ret
irqRoutine:
push af
ld a, 30h
out (0b4h), a
push bc
push de
push hl
push ix
call dave_play
pop ix
pop hl
pop de
pop bc
pop af
ei
ret
vsync_wait:
.l1: in a, (0b4h)
and 10h
jr z, .l1
.l2: in a, (0b4h)
and 10h
jr nz, .l2
ret
; HL = message address
status_message:
ld a, 0ffh
out (0b3h), a
ld de, (0fff6h)
ld a, d
or high 0c000h
ld d, a
ld bc, 40
xor a
.l1: cp (hl)
jr z, .l2
ldi
jp pe, .l1
.l2: ld a, c
or b
ret z
ld a, 20h
ld (de), a
inc de
dec bc
jr .l2
; HL = error message address
error_exit:
di
call status_message
ld b, 100
.l1: call vsync_wait
djnz .l1
resetRoutine:
di
ld sp, 3800h
ld a, 0ffh
out (0b2h), a
ld hl, resetRoutine
ld (0bff8h), hl
call restoreIRQHandler
ld c, 40h
exos 0
ld a, 01h
out (0b3h), a
ld a, 6
jp 0c00dh
include "daveplay.s"
include "midi_in.s"
include "decompress_m2_new.s"
include "globals.s"
assert $ <= 0c000h
prgEnd: