flat assembler
Message board for the users of flat assembler.

Index > DOS > How to make my SB AWE 64 (or SB16, perhaps) double channel?

Author
Thread Post new topic Reply to topic
Cas



Joined: 26 Feb 2004
Posts: 82
Location: Argentina
Cas
Confused I'll explain myself:

When I program the SB DSP together with a DMA, I get one transfer, either for input or for output, but I would like to play something, while I rec something else, for example, for a talk or for a studio-like recording. Do I need to stablish two DMA channels?

Anyway, as far as I have read, there appears to be no register of the DSP that handles two transfers at a time, so I am totally clueless. Where can I get that information?
Laughing

_________________
Ā«Earth is my country; science is my religionĀ» - Christian Huygens
Post 30 Aug 2004, 05:56
View user's profile Send private message Yahoo Messenger MSN Messenger Reply with quote
ASHLEY4



Joined: 28 Apr 2004
Posts: 376
Location: UK
ASHLEY4
I have not worked on SB16 for years, so am ruste, but here may help http://www.singlix.org/trdos/specs.html
go to this site and get the txt doc "AWE32P10 TXT" in it is a part called " Sample Uploading/Downloading" which tells howto up/down load at the same time, (does not us dma) it may help ?.

\\\\||////
(@@)
ASHLEY4.
Post 30 Aug 2004, 14:41
View user's profile Send private message Reply with quote
Bitdog



Joined: 18 Jan 2004
Posts: 97
Bitdog
Hello my friend, ASHLEY4.
You're always in the right place, at the right time, with the right thing to say.
Bitdog
Post 05 Sep 2004, 05:25
View user's profile Send private message Reply with quote
Cas



Joined: 26 Feb 2004
Posts: 82
Location: Argentina
Cas
Ashley: I have not yet tried that link. I'm going to do it right now. But anyway, I've got the sensation that it is only about loading and uploading samples in the AWE soundbank. What I need is DSP handling. This is also useful to me, but, what do you know about the DSP in this matter?
Post 08 Sep 2004, 21:47
View user's profile Send private message Yahoo Messenger MSN Messenger Reply with quote
ASHLEY4



Joined: 28 Apr 2004
Posts: 376
Location: UK
ASHLEY4
This is a DSP lib from the above site.
Code:
;------------------------------; SB_DSP.ASM --; Programmer's library for the Sound Blaster DSP interface;-------------------------------                        IDEAL                        MODEL small                        DATASEGSB_IO_Port  DW 0220h    ;These values are kept here to avoid addDSP_Reset   DW 0226h    ;instructions in code that may be time-DSP_RDData  DW 022Ah    ;sensitive.DSP_Command DW 022ChDSP_RDAvail DW 022EhDSP_WRData EQU DSP_Command      ;Aliases for the same variable nameDSP_Status EQU DSP_Command                        CODESEGPUBLIC _dsp_reset,_dsp_voice,_set_SB_address,_dsp_dma_prepare,_dsp_timeMACRO await_DSPLOCAL @@Wait_Ready     push ax dx@@Wait_Ready:     mov  dx,[DSP_Status]     in   al,dx     and  al,128      jnz @@Wait_Ready     pop  dx axENDM MACROMACRO ten_microsec_delayLOCAL @@KT                 ;If you know of a better, more accurate,     push cx               ;more reliable, just plain smarter, way     mov  cx,20000         ;to do this, PLEASE TELL ME.@@KT:                      ;     nop                   ;(The idea is to kill 10 microseconds.)     loop @@KT             ;     pop  cx               ;email: heathh@cco.caltech.eduENDM ten_microsec_delay;------------------------; void far dsp_time(int pacing);-----------------------; pacing = 255 - (1,000,000 / frequency);----------------------PROC _dsp_time FARARG delay:WORD     push bp     mov  bp,sp     push ax dx     await_DSP     mov  dx,[DSP_Command]     mov  al,040h     out  dx,al     await_DSP     mov  dx,[DSP_Command]     mov  ax,[delay]     out  dx,al     pop  dx ax     pop  bp     retENDP _dsp_time;------------------------------; void far dsp_reset(void);------------------------------PROC _dsp_reset FAR     push ax dx     mov  dx,[DSP_Reset]     mov  al,1     out  dx,al     ten_microsec_delay     mov  al,0     out  dx,al@@Wait_Ready:     mov  dx,[DSP_RDAvail]     in   al,dx     and  al,128       jz @@Wait_Ready     mov  dx,[DSP_RDData]     in   al,dx     cmp  al,0AAh      jne @@Wait_Ready     mov  ax,165     push ax     call _dsp_time     pop  ax     pop  dx ax     retENDP _dsp_reset;-----------------------------; void far dsp_dma_prepare(int Dir,int Length);-----------------------------; Dir = 0 for Microphone Input, 1 for Speaker Output; Length = Length of data to be sampled/played;-----------------------------PROC _dsp_dma_prepare FARARG Dir:WORD,Len:WORD     push bp     mov  bp,sp     push ax dx     await_DSP     mov  al,24h     cmp  [Dir],0       jz @@Is_Read     mov  al,14h@@Is_Read:     mov  dx,[DSP_Command]     out  dx,al     await_DSP     mov  ax,[Len]     out  dx,al     await_DSP     mov  al,ah     out  dx,al     pop  dx ax     pop  bp     retENDP _dsp_dma_prepare;---------------------------; void far dsp_voice(Activity);---------------------------; Activity = 0 for silent, 1 for audible;---------------------------PROC _dsp_voice FARARG Which:WORD     push bp     mov  bp,sp     push dx ax     await_DSP     mov  ax,[Which]     and  al,1                  ;Want a 1/0 parameter     xor  al,1     shl  al,1     or   al,0D1h     mov  dx,[DSP_Command]     out  dx,al     pop  ax dx     pop  bp     retENDP _dsp_voice;--------------------------; void far set_SB_address(int base);-------------------------; Sets base port of SoundBlaster that other functions refer to.; Most likely value (and the default): 0x220;-------------------------PROC _set_SB_address FARARG Port:WORD     push bp     mov  bp,sp     push ax     mov  ax,[Port]     mov  [SB_IO_Port],ax     add  ax,6     mov  [DSP_Reset],ax     add  ax,4     mov  [DSP_RDData],ax     add  ax,2     mov  [DSP_Command],ax     add  ax,2     mov  [DSP_RDAvail],ax     pop  ax     pop  bp     retENDP _set_SB_addressEND    


As i am making a 32bit dos like OS, i will be looking into sound card drivers etc, i will be moving on from SB16 etc, maybe looking at AC97 chips as a lot of sound cards use these
chips, i am just get info at the moment, no coding on sound yet.
So i do not have much info, i use to program SB16 for my dos games and cdplayer etc, but have forgotan most things Crying or Very sad.


\\\\||////
(@@)
ASHLEY4.
Post 09 Sep 2004, 09:21
View user's profile Send private message Reply with quote
Display posts from previous:
Post new topic Reply to topic

Jump to:  


< Last Thread | Next Thread >
Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Copyright © 1999-2019, Tomasz Grysztar.

Powered by rwasa.