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From: pts@faraday.clas.Virginia.EDU (Paul T. Shannon)
Newsgroups: comp.dsp
Subject: simple dsp programming questions
Message-ID: <1991Mar22.230908.16792@murdoch.acc.Virginia.EDU>
Date: 22 Mar 91 23:09:08 GMT
Sender: usenet@murdoch.acc.Virginia.EDU
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Organization: University of Virginia
Lines: 22

I'm looking for some help with two simple 56k dsp programming tasks:

   1.  sit in a loop til an external voltage level goes high 
   2.  delay a host-specified number of milliseconds, and then
       produce a short tone.

For the first task, I imagine that I should use one of the SCI pins.

Since I'm doing this on a NeXT, the second task should probably 
play the short tone to the NeXT sound hardware.

I've pored over the sample programs NeXT provides, but either they
don't do what I need, or I missed it.  I think that I *do* understand
how to use the SND functions to load and run a program on the dsp.
I've made some progress from reading the DSP User's Manual, but I've
only moved from a state of total blindness to one of partial vision
in one eye on a moonless night...

I'll be grateful for any help, especially short dsp programs.  Thanks.

 - Paul Shannon
   pts@Virginia.EDU