Saga of the uP developer

[Tim Ressel]

Let this be a warning to anyone who thinks they want to develop uP devices: Have
your debugging skills honed o a keen edge!

So, I got the uP ADSR hardware in working order. Then I wrote some test code to
output a ramp; just incremented a counter and sent the results to te DACs. What
I saw on the scope was a series of small ramps with gaps in between. After much
head scratching. I discovered my new development system (miniIDE) was making
HC12 code, not HC11 code. Fixed that, still had the odd ramps. More scratching
of various body parts. Then it finally hit me: out of the two jumpers setting
the mode of the HC11 I had pulled the wrong one, thus putting the uP into
"Special Test" mode instead of "single chip" mode. Apparently special test mode
toggles all of the output lines in counter-like fashion. The output to DACs was
remarkably similar to the ramps I had programmed! Sigh...

The clue, by the way, was some of the lines were toggling at the uP clock rate.
A physical impossiblity under program control.

So now the ADSR hardware works, and my development system works as well. I am
all set to code the ADSR. Now if I could only find the sheet with the state
diagrams I made....

Stay Tuned.

Tim Ressel--Compliance Engineer
Hewlett-Packard
Verifone Division
916-630-2541  
tim_r1 at verifone.com                     



-----Original Message-----
From: Hallvard Tangeraas [mailto:hall at oslo.online.no]
Sent: Monday, June 26, 2000 6:53 AM
To: synth-diy at node12b53.a2000.nl
Subject: Re: MIDI to Sync24 Converter - and other pic goodies!


At 10:44 +0200  26-06-2000, tomg wrote:


>List member - Bojan Burkeljc has a MIDI to Sync24 Converter Pic project
>on his site (includes the hex).....Actually there is a lot of midi
>stuff...
  [......]

Great stuff! I'll be checking out all those websites you mentioned.
But in case I don't find what I need, does anyone know of a DIY project
which will add MIDI IN to my Roland TR-808 drum machine?
Has anyone here MIDIed their TR-808?

I don't want to spend a fortune on this, but it would be nice to be
able to have MIDI on it, instead of having to reply on DIN 24 sync or
sampling the drum sounds!

Hallvard
--
Hyperlink Launchpad: <http://www.crosswinds.net/~hall/>
Atari Launchpad    : <http://launchpad.atari.org>
Notator/Creator SL : <http://www.crosswinds.net/~notator/>