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PICList Thread
'[PIC] Programming and De-Multiplexers'
2008\08\22@164418 by computergeekxp

picon face

How can I write a function which encodes data like a multiplexer, so it can
be fed out a pin into a demultiplexer? I understand the function a
de/multiplexer but not its intricacies.
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2008\08\22@165709 by olin piclist

face picon face
computergeekxp wrote:
> How can I write a function which encodes data like a
> multiplexer, so it can be fed out a pin into a demultiplexer?

Is the demultiplexer protocol already set, or is it something you get to
pick?  How many lines?  What data rate?  Why do you need to convert to a
single signal?  What constraints does that signal have?

It's rediculous to even begin to suggest anything without a lot more
information.

It's the wrong time of year for end of semester assignment coming due, but
this smells like one.


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2008\08\23@131001 by computergeekxp

picon face

Could you provide a reference page on doing this or perhaps some code I can
look at? I'm not even sure of the specifics yet. The overall idea is to use
a pic to drive a series of led's. Each one would get a series of pulses to
control their brightness (smoothed out with a capacitor). This is not an
assignment; i'm not in college yet.


Olin Lathrop wrote:
{Quote hidden}

> --

2008\08\23@214722 by Bob Blick

face
flavicon
face
Are you talking about parallel-to-serial in general, or meeting some
hardware or software signaling standard?

Because in general you would use a shift or rotate command after testing
the bit at whatever end you are shifting away from.

It also might depend on what PIC architecture you're planning to use,
and what language.

But I've already invested more time in my response than you did in your
original question. The ball's in your court now.

Cheerful regards,

Bob

computergeekxp wrote:
> How can I write a function which encodes data like a multiplexer, so it can
> be fed out a pin into a demultiplexer? I understand the function a
> de/multiplexer but not its intricacies.

2008\08\26@072507 by Alan B. Pearce

face picon face
> How can I write a function which encodes data like a
> multiplexer, so it can be fed out a pin into a demultiplexer?

Study how a serial port works?

2008\08\26@232603 by cdb

flavicon
face


:: How can I write a function which encodes data like a
:::: multiplexer, so it can be fed out a pin into a demultiplexer?

I have some code for a 74HC595, and a big boy 32 bit version for LCD
displays.

But do you know how to send a serial information out of a PIC?

Which end of your serial stream is to be first - left hand bit or
right hand bit (msb or lsb)?

Do you have a specific demultiplexor chip in mind?

Colin
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