[ardour-users] MMC commands and remote control

Pierre-Laurent CHAMBERT pilo.c at wanadoo.fr
Thu Mar 10 11:53:44 PST 2005

Hi all

There's a very good DIY project about midi controller already : Midibox 
All the features you want to have are already made : knobs, motor fader, 
encoder, LCD (char and graphic), USB, firmware uploading via MIDI etc.

There are firmware for emagic LC and huston emulation too (and some others). I 
already test it with ardour, and I'm working (well... for 2 years now, I need 
more time to finish it) for a custom midibox for ardour, with the same layout 
as the digidesign procontrol (at least for the channel strip stuff).

I hope to see more ardour users on midibox forum :)

Le Jeudi 10 Mars 2005 20:44, Geoffrey Wossum a écrit :
> On Thu, 2005-03-10 at 19:11 +0000, Rob Fell wrote:
> > > For me it's the other way round. I have worked with Atmels micros for a
> > > year now and they seems to be very handy. I've heard that PICs are much
> > > more complicated to program but this surely is subjective.
> >
> > What does the programming hardware cost?  A PIC programmer only costs a
> > few UKP if you build it yourself.
> I've had multiple years of experience with both PIC (16 series) and
> ATmel AVR ATmega series microcontrollers.  For me, the AVR blows the 16
> series away.  I've had a small amount of experience with 18 series PIC,
> but I still like the AVR better.  And I'm not just saying that because
> I'm working on an AVR right now.  ^_^
> > If this project takes off, it'd be nice to sort out a complete free
> > toolchain and PCB artwork - just to make it easy for anyone who wants to
> > make their own :)
> There is a complete GCC based toolchain for the AVR.  Check out
> http://www.nongnu.org/avr-libc/
> For cheap AVR programmers, check out http://www.sparkfun.com
> I personally use STK200 or STK500 programmers for the ATmel parts, but
> that's because my employer buys them for me.  These are going to run you
> $50 - $100.  It's easy and cheap to build an STK200 knock-off though, as
> all it is a DB-25 with a 74 series latch and a diode.  There's
> schematics on the Internet for it, sorry I don't have a quick link to
> it.
> > > I know that, I have worked already with PCF8574 chips coupled over I2C
> > > bus to increase the number of in-/outputs.
> I use PCA9555 chips quite a bit as I2C I/O expanders.  They're nice to
> work with.  16 programmable input/output lines with an attention signal.
> Not sure of the cost, as BOM's aren't my concern.
> > >>A better option is to use rotary digital encoders - but they are
> > >>difficult to use when you have many of them (the required sampling
> > >> rates are surprisingly high to cope with high angular rotational
> > >> rates).
> > >
> > > I have used one half a year ago and I was not very satisfied with my
> > > results.
> >
> > I've had good results in commercial products, but that was for only a
> > few encoders.  In automotive environments I needed 100Hz sampling and
> > some serious software filtering :)
> The larger parts (ATmega128) have 8 A/D converters.  I would imagine
> that the AVR also has enough horsepower to handle multiple encoders,
> plus the MIDI stream, based on my experience with AVR's.  I use them
> frequently for RF demodulation.  They have plenty of horse power for the
> high sample rates and filtering required for RF demodulation, and still
> have plenty have horsepower leftover for other tasks.  I also have an
> 802.15.4 stack running on some of my products, which does a LOT of work
> on a 320 uS timer interrupt.
> ---
> Geoffrey
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