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Subject: Re: [korgpolyex] A software update...

From: Michael Hawkins <korgpolyex800@...>
Date: 2008-12-16

such filtering is in the code already but the MIDI reception code is simply too big to handle fast incoming (ie: modern) MIDI messages so that the Poly was being over run and missing bytes of the MIDI message.

Since MIDI messages are somewhat bursty (network speak), adding a high speed FIFO buffer interrupt service routine allows the Poly to quickly receive MIDI messages and then process them at its lazy CPU pace.

This may sound like we're slowing things down but in fact we're just giving the Poly the exact same buffering that all decent MIDI devices have.

At the moment the buffer is only 256 bytes and it works great at that.

Mike.

From: Atom Smasher <atom@...>
To: korgpolyex@yahoogroups.com
Sent: Tuesday, December 16, 2008 3:52:01 PM
Subject: Re: [korgpolyex] A software update...

On Tue, 16 Dec 2008, korgpolyex800 wrote:

> Since modern MIDI controllers, sequencers etc can send messages a lot
> faster than the original Poly-800 ever expected, it was necessary to
> implement a buffer on the incoming MIDI.
============ ======

i'm curious... within the hardware constraints of the 800, is there a way
to pre-process the incoming midi and discard everything that's going to a
different channel, before it it has a chance to clog/overflow the buffer?
or is something like that already done?

--
...atom

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