Making noise with the SPC700 , help!

Making noise with the SPC700 , help!
by kp64 on 2015-04-05 (#144573)

I have zero knowledge about digital audio.
I started playing with the SPC700 and I want to reproduce one sample.
Im using the "cymbal.brr" sample that 93143 posted here:(basamples_v2.7z)
viewtopic.php?f=12&t=10696&start=120#p142336

The situation is the following:

-I have written one 65816 routine that can upload data to the APU RAM and set the execution address
-I can transfer the sample and the program.(The SPC700 executes my program without problem)
-The sample and the program are stored in the ROM like a single binary file , organized in this way:

Code:

$0000->|--------------| \
       | SAMPLE       | | "cymbal.brr" 17010 bytes
$4272->|--------------| /
       | Program      |
$43B6->|--------------|

This binary is transfered to $0200-$45B6 on the APU RAM.

This is my SPC700 code:
(I'm unexperienced with the spc700 , I dont know the instructions & addressing modes , so be kind and dont laught too much :oops:

)

Code:

;-----------------------------------------------------------------------------------------
;*This WLA directives are from the nwarp code by d4s
;-----------------------------------------------------------------------------------------
.MEMORYMAP               ; Tell WLA that the SPC has RAM at locations ;$0000-$ffff in every bank
   SLOTSIZE $10000         ; and that this area is $10000 bytes in size.
   DEFAULTSLOT 0         ; There is only a single slot in SNES, other consoles
   SLOT 0 $0000            ; may have more slots per bank.
.ENDME

.ROMBANKSIZE $00144      ; Every ROM bank is 64 KBytes in size
.ROMBANKS 1
;----------------------------------------------------------------------------------------

.EQU DIR $02   ;SOUND DIRECTORY ADDRESS

.BANK 0 SLOT 0

   mov A,#$5D
   mov $F2,A

   mov A,#DIR
   mov $F3,A   ;Set DIR value ( 2 * 100h = 200h)

   ;Set volume to the max

   mov A,#$0C
   mov $F2,A

   mov A,#$7F
   mov $F3,A   ;Left output main volume

   mov A,#$1C
   mov $F2,A

   mov A,#$7F
   mov $F3,A   ;Right Output main volume

   ;VOICE 0 SETTING

   mov A,#$00
   mov $F2,A

   mov A,#$7F
   mov $F3,A   ;voice 0 volume left

   mov A,#$01
   mov $F2,A

   mov A,#$7F
   mov $F3,A   ;voice 0 volume RIGHT

   mov A,#$02
   mov $F2,A

   mov A,#$00
   mov $F3,A   ;voice 0 pitch low byte

   mov A,#$03
   mov $F2,A

   mov A,#$10
   mov $F3,A   ;voice 0 pitch high byte

    mov A,#$04
   mov $F2,A

   mov A,#$00
   mov $F3,A   ;voice 0 SRCN

   ;============;

   mov A,#$4C
   mov $F2,A

   mov A, #$01
   mov $F3,A   ;K-ON , activate voice 0

-:
   ;instructions for testing
   mov A,#$DD
   mov X,#$EE
   mov Y,#$FF

   bra -

What im doing wrong?
Any example of how to do this?
Any brr test sample?

Re: Making noise with the SPC700 , help!
by kp64 on 2015-04-06 (#144622)

I tried again:

Code:

;-----------------------------------------------------------------------------------------
.MEMORYMAP               ; Tell WLA that the SPC has RAM at locations ;$0000-$ffff in every bank
   SLOTSIZE $10000         ; and that this area is $10000 bytes in size.
   DEFAULTSLOT 0            ; There is only a single slot in SNES, other consoles
   SLOT 0 $0000            ; may have more slots per bank.
.ENDME

.ROMBANKSIZE $00144      ; Every ROM bank is 64 KBytes in size
.ROMBANKS 1
;----------------------------------------------------------------------------------------


.EQU DIR $02   ;SOUND DIRECTORY ADDRESS

.BANK 0 SLOT 0

   mov $F2,#$5D
   mov $F3,#DIR   ;Set DIR value ( 2 * 100h = 200h)

   ;Set volume to the max

   mov $F2,#$0C
   mov $F3,#$7F   ;Left output main volume

   mov $F2,#$1C
   mov $F3,#$7F   ;Right Output main volume


   mov $f2,#$0F
   mov $F3,#$7F   ;FIR filter


   mov $f2,#$0D
   mov $f3,#$00   ;Echo feedback = 0

   mov $f2,#$7D
   mov $f3,#$00   ;ESA , shortest echo delay

   ;VOICE 0 SETTING

   mov $f2,#$2C
   mov $f3,#$00   ;Left echo volume = 0


   mov $f2,#$3C
   mov $f3,#$00   ;Right echo volume = 0


   mov $F2,#$00
   mov $F3,#$7F   ;voice 0 volume left


   mov $F2,#$01
   mov $F3,#$7F   ;voice 0 volume RIGHT


   mov $F2,#$02
   mov $F3,#$00   ;voice 0 pitch low byte

   mov $F2,#$03
   mov $F3,#$10   ;voice 0 pitch high byte


   mov $F2,#$04
   mov $F3,#$00   ;voice 0 SRCN


   mov $F2,#$07
   mov $F3,#$7F   ;Gain up

   ;============;

   mov $F2,#$4C
   mov $F3,#$01   ;K-ON , activate voice 0

-:
   ;instructions for testing
   mov A,#$DD
   mov X,#$EE
   mov Y,#$FF

   bra -

still not working

Re: Making noise with the SPC700 , help!
by nocash on 2015-04-06 (#144648)

If you want to hear something then you will need to unmute the "FLG" register (DSP register 6Ch).

Your memory map could be improved, too. If the program starts at 4272h in SNES ROM, and gets moved to an address 200h bytes higher in APU RAM, then your program should start at 4472h. So you should tell the assembler that is originated at that address (by some directive like "ORG 4472h").
At the moment that shouldn't matter though since your code isn't using any address operands (apart from the BRA opcode; which works regardless of the origin, since it's a relative jump).
Might be also good to place the code at 0200h, and the data at, say, 1000h and up. So you won't need to change the code ORG setting each time when the size of your sample data changes.

Re: Making noise with the SPC700 , help!
by kp64 on 2015-04-07 (#144705)

nocash wrote:

If you want to hear something then you will need to unmute the "FLG" register (DSP register 6Ch).

With $6C set at $00 and GAIN(Voice 0) set to $7F , a whistle sounds each time that I start the program,
and If I activate all the chanels , I get a lot of random noise , at least thats something

nocash wrote:

Your memory map could be improved, too. If the program starts at 4272h in SNES ROM, and gets moved to an address 200h bytes higher in APU RAM, then your program should start at 4472h. So you should tell the assembler that is originated at that address (by some directive like "ORG 4472h").
At the moment that shouldn't matter though since your code isn't using any address operands (apart from the BRA opcode; which works regardless of the origin, since it's a relative jump).
Might be also good to place the code at 0200h, and the data at, say, 1000h and up. So you won't need to change the code ORG setting each time when the size of your sample data changes.

I will do that , thanks.

Re: Making noise with the SPC700 , help!
by 93143 on 2015-04-07 (#144708)

kp64 wrote:

With $6C set at $00 and GAIN(Voice 0) set to $7F , a whistle sounds each time that I start the program,
and If I activate all the chanels , I get a lot of random noise , at least thats something

That sample is a crash cymbal highpassed at 8 kHz, with the tail stretched and looped. The sustained portion is basically a hiss, plus some broadband noise due to the BRR compression. The way you describe it, it sounds like it might be working.

...I should really do something about that thing. It's way longer than it needs to be, and you can hear the loop...

EDIT: Wow, this is harder than it looks. I managed to cut the sample down to less than half its original length with a nearly perfect-sounding short loop, and then the trip through the BRR encoder ruined it. The recovered signal is still smooth to my ears, but the loop is clearly audible in the compression artifacting...

EDIT2: new file, slightly shorter cymbal.brr.

Re: Making noise with the SPC700 , help!
by bazz on 2015-04-10 (#144929)

seeing this poor fella trying to get his program work makes me want to write up a tutorial