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PICList Thread
'selection of microcontroller for stereo'
1999\01\27@171415 by marquis De

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ok, first off im 24, (OT)
2nd, im looking for a microcontroller to "run-the-show" in a stereo im
building, that utilizes a LCD screen, and a passive backplane: so what
im looking for is to build a cpu card aka "single board computer" with
a PIC controller, to blast text on the LCD and then control the DSP
functions of another PCI card, (using the ADSP-2106x family)
finally, it must be able to arbitrate, control, and be fast enough to
run a PCI bus
any suggestions?
desade666
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1999\01\27@194634 by Sean Breheny

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Hi,

I don't think that ANY of the PIC family is capable of mastering a PCI bus.
I don't however see why you need to use the PCI bus. What is happening in
your stereo that is so fast as to require PCI? It may be possible to slow
down the PCI to the point where a PIC can handle it, I'm not sure , but it
seems to me to be the wrong approach. Can't you still find an ISA card that
performs the functions you need? A PIC should be able to talk to one or a
few ISA cards.
Actually, though, I'm not convinced that it is making it easier on yourself
to try to use an off-the-shelf PC card in your design. Usually, people will
do this with modems becuase it is very hard to find modem chips that AREN'T
designed to operate directly from a personal computer bus.

Good luck,

Sean

At 02:16 PM 1/27/99 -0800, you wrote:
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1999\01\28@115220 by marquis De

picon face
---Sean Breheny <.....shb7KILLspamspam@spam@CORNELL.EDU> wrote:
>
> Hi,
>
> I don't think that ANY of the PIC family is capable of mastering a
PCI bus.
> I don't however see why you need to use the PCI bus. What is
happening in
> your stereo that is so fast as to require PCI?

-well,
the DSP card (which is utilizing the ADSP-21061, 32-bit floating point
DSP chip in a quad processor setup)
is on a PCI card, 2nd the driver card for the LCD screen is also PCI...
so, i could have spent a year or two building these, but why? theyre
available, "off-the-shelf"
3rd i am building a card (PCI) to control some tubes...ie. grid and
plate voltage)
so, im building all this on a passive backplane...meaning there is no
support architecture built onto the mainboard, it must all reside on
the cpu card...so i was thinking the simplicity of the PIC might be
the way to go here, there are chips made by scenix that are in the
range of 33-100mhz

It may be possible to slow
> down the PCI to the point where a PIC can handle it, I'm not sure ,

-dont want to cause any latency, there are 20in and 20 outs on the dsp
engine...plus 4 fiber in/outs

but it
> seems to me to be the wrong approach. Can't you still find an ISA
card that
> performs the functions you need?

-no, otherwise i wouldnt be doing this way

A PIC should be able to talk to one or a
> few ISA cards.
> Actually, though, I'm not convinced that it is making it easier on
yourself
> to try to use an off-the-shelf PC card in your design. Usually,
people will
> do this with modems becuase it is very hard to find modem chips that
AREN'T
> designed to operate directly from a personal computer bus.
>
> Good luck,
>
> Sean
>

-well, like i said, i could spend years re-inventing the wheel, but id
rather spend time loading up the DSP chips with algorithms to
encode/decode THX, AC-3 (5.1, and 7.1) and prologic, and then either
enable the tubes  at the same time, or maybe two channels, and the dsp
on the other 4, or whatever (gotta build it and see how it sounds)
so, im looking to use either a PIC or otherwise to
A. put text on screen
B. interprit serial data coming from the touch membrane
c. move through the text fields, changing algorithms in    the DSP
chip, etc according to user input
D. obviously control bus arbitration, bus mastering,      etc. which
the user is oblivious to
E. instruct DSP card to receive/transmit through    assigned I/Os and
add effect to the signal, which      one, etc.
um, im sure im leaving some stuff out?...
but its just my rough idea, however i am locked into PCI simply
because i was able to get the graphics card w/ LCD (10.4"), the DSP
card and the touch membrane for free...so? i got to use em, i want to
use them, its all pretty slick, but thats where my question has its
roots, simply put...is the PIC capable?
desade


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1999\01\28@190253 by Mike Keitz

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On Thu, 28 Jan 1999 08:52:10 -0800 marquis De <desade666spamKILLspamYAHOO.COM>
writes:

>-well, like i said, i could spend years re-inventing the wheel, but id
>rather spend time loading up the DSP chips with algorithms to
>encode/decode THX, AC-3 (5.1, and 7.1) and prologic,

Use a low-end Pentium mother board (should be well under $100 these days)
and a small IDE hard drive to get started.  You may be able to fit all
the software in ROM later, perhaps replacing the BIOS ROM with your code.
This would be a whole lot simpler than building your own CPU board, PCI
interface, etc. which would be reinventing the wheel.  The DSP probably
comes with development software intended to run on a PC anyway, right?
If this is a one-off project or inteneded to sell for an astronomical
price, there isn't much need to optimize it.

>and then either
>enable the tubes  at the same time, or maybe two channels, and the dsp
>on the other 4, or whatever '

Control the tube unit through a serial or parallel port.  You don't need
the bandwidth of a PIC slot to change a few voltages or switch relays
once in a while.  Keeping audio circuits away from high-speed computer
busses is usually a good idea.  A PIC could be used in the tube unit for
example to interpret commands received by RS-232.


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