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| Acmlm's Board - I2 Archive - Programming - Gameboy sound is getting shut off! |
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HyperLamer <||bass> and this was the soloution i thought of that was guarinteed to piss off the greatest amount of people Sesshomaru Tamaranian Level: 118 Posts: 2282/8210 EXP: 18171887 For next: 211027 Since: 03-15-04 From: Canada, w00t! LOL FAD Since last post: 2 hours Last activity: 2 hours |
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| Here's the code I'm using to play a sound (on both channels 1 and 2): ldi a,(hl) ;Get frequency 1 and a jr z, .nofreq1 ;Skip this if zero push af ldh a,(soundchannels) ;FF25 or $11 ;Enable channel 1 on both speakers ldh (soundchannels),a ld a,$FF ;Set sound length ldh (sound1+1),a ;FF10 pop af ldh (sound1+3),a ;Set frequency ld a, $C7 ;High freq byte, endless, start ldh (sound1+4),a .nofreq1: ldi a,(hl) ;Get frequency #2 and a jr z, .nofreq2 ;Skip if zero push af ldh a,(soundchannels) or $22 ;Enable channel 2 on both speakers ldh (soundchannels),a ld a,$FF ;Set length ldh (sound2+1),a ;FF15 pop af ldh (sound2+3),a ld a,$C7 ;High byte, endless, start ldh (sound2+4),a .nofreq2: ld a,%01110111 ;Max volume, vin off ld (soundvolume),a ;Delay loop push bc ldi a,(hl) ;Get delay time ld b,a ldi a,(hl) ld c,a .delay: dec c jr nz, .delay dec b jr nz, .delay pop bc When it goes into the delay loop, all the sound registers are fine, but by the time it gets to 'dec b', they've all been wiped to zero and no sound actually plays.  Interrupts are disabled during this code, and envelopes are off. (And for those who ask why I bother to set lengths when I also set the 'endless' flag, I was just trying to get the damn thing to work.  I'll make it less hacky later.) What exactly is going on here? |
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Dish Spiny Level: 38 Posts: 210/596 EXP: 355646 For next: 14801 Since: 03-15-04 From: Disch Since last post: 18 days Last activity: 18 days |
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| I'm assuming 'sound1' is $10, no? > ld a,$FF ;Set sound length > ldh (sound1+1),a ;FF10 Your ";FF10" comment threw me off here at first... since you're really writing to $FF11 (assuming 'sound1' is $10 and not $0F). > ld a, $C7 ;High freq byte, endless, start > ldh (sound1+4),a if you're looking for 'endless' sound you want the length counter disabled (not enabled), so turn that bit off, not on (a write of $87 would do). You never seem to write to $FF12 (never giving the channel an output volume). Write to this with your volume (range: 0-F) as the high 4 bits, and keep the low 3 bits off (unless you want envelope enabled). You're writing to $FF25, which is good... but I don't see you writing to $FF26. You have to flip the high bit of $FF26 on to turn on the pAPU. If you don't... the pAPU doesn't get power and no sound is produced (this may very well be your main problem -- unless you did it elsewhere and didn't paste that portion). > (And for those who ask why I bother to set lengths when I also set the 'endless' flag It's important to write a nonzero value to the length anyway. I'm not 100% sure on the GB, but if it's anything like the NES (which it seems to be), a length count of zero would silence the channel even if length is disabled. I'm not as confident on GB Sound as I should be... I may be wrong on a few areas but it's worth a look anyway ^^. |
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HyperLamer <||bass> and this was the soloution i thought of that was guarinteed to piss off the greatest amount of people Sesshomaru Tamaranian Level: 118 Posts: 2292/8210 EXP: 18171887 For next: 211027 Since: 03-15-04 From: Canada, w00t! LOL FAD Since last post: 2 hours Last activity: 2 hours |
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| I was using 87 as well (though come to think of it, yeah, I should be doing that ). Yes, sound1 is $FF10 and sound2 is $FF15. (And in case any of you couldn't guess, a percent sign indicates Binary. Should have mentioned that.) ...Oops, always make sure your speakers are ON when testing sound.  Although that wasn't the only problem. Apparently it was the volume at $FF12/$FF17. Heh, I thought that was only for envelopes... Thanks! |
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