mirror of
https://github.com/ksherlock/itty-bitty-vtty.git
synced 2024-11-23 17:33:57 +00:00
200 lines
2.3 KiB
ArmAsm
200 lines
2.3 KiB
ArmAsm
|
|
lst off
|
|
cas se
|
|
|
|
rel
|
|
xc
|
|
xc
|
|
|
|
use apple2gs.equ
|
|
|
|
|
|
mx %11
|
|
|
|
|
|
|
|
*
|
|
*
|
|
* keypress @ 44.1 - 28 samples of $40, 29 samples of $b0
|
|
*
|
|
* beep - repeat keypress 53 times
|
|
*
|
|
* by adjusting rate, only need 1 sample each.
|
|
*
|
|
* w/ 2 oscillators, scan rate = 223.7 kHz ~5x 44.1
|
|
* 28 samples * 5 = 142
|
|
* res = 7. (1 << 16) / 142 = ~ 461
|
|
* freq = 461, res = 7, wave size = 256 --> n * 461 >> 16
|
|
*
|
|
*
|
|
|
|
|
|
*
|
|
* vt52
|
|
* keypress - ~730 samples, $40, curve to 0 or $b0, curve to 0
|
|
* beep 14 keypresses
|
|
*
|
|
*
|
|
|
|
|
|
bic mac
|
|
if #=]1
|
|
and ]1!$ffff
|
|
else
|
|
err 1 ; immediate only.
|
|
fin
|
|
<<<
|
|
|
|
docwait mac
|
|
if MX<2
|
|
err 1 ; 8-bit m only
|
|
fin
|
|
wait lda SGCONTROL
|
|
bmi wait
|
|
<<<
|
|
|
|
docmode mac
|
|
docwait
|
|
bic #%01000000 ; DOC mode
|
|
ora #%00100000 ; auto-incr
|
|
ors #%0000_1111 ; max volume.
|
|
sta SGCONTROL
|
|
<<<
|
|
|
|
rammode mac
|
|
docwait
|
|
ora #%01100000 ; RAM mode, auto-incr
|
|
sta SGCONTROL
|
|
<<<
|
|
|
|
|
|
init_audio ent
|
|
|
|
docmode
|
|
|
|
* 4 oscillators. -- (2 for key, 2 for beep -- stereo!)
|
|
lda #$e1
|
|
sta SGADDRL
|
|
|
|
lda #4*2
|
|
sta SGDATA
|
|
|
|
* control registers
|
|
* just set them off. channels will be set when they fire.
|
|
|
|
lda #$a0
|
|
sta SGADDRL
|
|
lda #%0000_0_01_1 ; ch 0, interrupts off, 1-shot, halted.
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
|
|
|
|
|
|
* freq low
|
|
lda #$00
|
|
sta SGADDRL
|
|
lda #<650
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
|
|
* freq high
|
|
lda #$20
|
|
sta SGADDRL
|
|
lda #>650
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
|
|
* volume
|
|
lda #$40
|
|
sta SGADDRL
|
|
lda #$ff
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
|
|
* wave table
|
|
lda #$80
|
|
sta SGADDRL
|
|
lda #0 ; page 0
|
|
sta SGDATA
|
|
sta SGDATA
|
|
inc ; page 1
|
|
sta SGDATA
|
|
sta SGDATA
|
|
|
|
|
|
|
|
* wave table size
|
|
lda #$c0
|
|
sta SGADDRL
|
|
lda #%00_000_111 ; 256 bytes, 16-bit shift
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
sta SGDATA
|
|
|
|
|
|
; now copy the data....
|
|
rammode
|
|
stz SGADDRL
|
|
stz SGADDRH
|
|
|
|
ldy #key_size
|
|
ldx #0
|
|
]loop lda key_data,x
|
|
sta SGDATA
|
|
inx
|
|
dey
|
|
bpl ]loop
|
|
|
|
stz SGADDRL
|
|
lda #1
|
|
sta SGADDRH
|
|
ldy #beep_size
|
|
ldx #0
|
|
]loop lda beep_data,x
|
|
sta SGDATA
|
|
inx
|
|
dey
|
|
bpl ]loop
|
|
|
|
rts
|
|
|
|
|
|
beep ent
|
|
; fire osc 2 + 3
|
|
docmode
|
|
|
|
lda #$a0+2
|
|
sta SGADDRL
|
|
lda #%0000_0_01_0 ; ch 0, interrupts off, 1-shot, running.
|
|
ldx #%0001_0_01_0 ; ch 1, interrupts off, 1-shot, running.
|
|
sta SGDATA
|
|
stx SGDATA
|
|
|
|
rts
|
|
|
|
|
|
key_data
|
|
db $01
|
|
db $ff
|
|
db $00
|
|
key_size equ *-key_data
|
|
|
|
beep_data
|
|
lup 53
|
|
db $01
|
|
db $ff
|
|
--^
|
|
db $0
|
|
beep_size equ *-beep_data
|
|
|
|
sav vt100.beep.L
|