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1995-06-18
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The GUS Programmer's Digest Sunday, 18 June 1995 Volume 20 : Number 011
Today's Topics:
Re: Simultaneous
Standard Info:
- Meta-info about the GUS can be found at the end of the Digest.
- Before you ask a question, please READ THE FAQ.
----------------------------------------------------------------------
From: Francois Dion <francois@hyperreal.com>
Date: Sat, 17 Jun 1995 11:41:01 -0700 (PDT)
Subject: Re: Simultaneous
Dans la Matrice, The GUS Programmer's Digest a dit:
>
> From: houghton@WHIRL.SPEECH.CS.CMU.EDU
> Date: Tue, 13 Jun 95 15:27:28 EDT
> Subject: Simultaneous record/play looping problem
>
> I have the reference sheets for the chipset and I know it is supposed
> to be possible to turn off this feature, however it is possible that
> Gravis hardwired this. (Why I don't know.) Before I purchased this
It is impossible to hardwire anything to disable the loopback function
on the CS4231. So yes, as it's possible to do it on the CS4231, it's
possible to do it on the Gravis Ultrasound Max. If you have the regular
GUS, then you'll need to modify it with my jumper specs on the gus
archive sites.
This function is called the digital loopback. All that is needed in your
application is to prevent the ADC data going directly to the DAC (and not
the other way around like you said. Just disable the digiatl loopback, and
you'll be done. This is accomplished by puttin a 0 in the LBE bit of the
Loopback Control Register (I13). You also have the possibility of simply
attenuating this value with the other bits in the I13 register.
If i remember correctly, base address is for teh indirect registers (like
I13) for the first 5 bits while the 6th bit must be set. base +1 is for
the value. In the case of I13, the lsb is the enable/disable, second bit
is unused and the others are the attenuation, where 0= 0dB attenuation
and 63=94,5dB attenuation.
Hope this helps.
Ciao,
- --
Francois Dion (IdMEDIA) [> Email: francois@hyperreal.com <]
' [> C.P. 278, St-Lambert, QC, Canada, J4P 2N8 <]
[> Raving Up North Ezine: run-request@hyperreal.com, subject: help <]
------------------------------
End of The GUS Programmer's Digest V20 #11
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