For my third PIC-based project, I chose a much more challenging design - a synthesiser built around a Yamaha DB50XG daughter card I already had, using a PIC18F2550 to provide USB access alongside the normal MIDI ports to drive the synthesiser.
Once again, Nuts & Volts accepted my submission for publication, and it became the main project featured on the cover of the February 2009 issue. The article was written in two parts, the second part appearing in the March 2009 issue.
Click on the image below for a PDF file containing the two original articles.
(Reprinted by permission only from T & L Publications, Inc., d.b.a., Nuts & Volts, Copyright 2003).
Although I put a lot of effort into keeping the articles' size down to the required word count for the magazine, they were reduced further by the editorial team, and the process introduced a couple of typos. You may prefer to read the originals as submitted - PDFs can be obtained by clicking on the other images below. Any errors in this version are, of course, down to me.
Development has continued on mistralXG since publication in Nuts & Volts. See Change record below.
This is the latest schematic for mistralXG. Click on the image for a full-size schematic.
You can get a PDF of the schematic here.
The code was written using the MPLAB 8.xx IDE, the C18 compiler and the USB Firmware Framework from Microchip. Development has continued since publication. See Change record below for a description of the changes and to obtain the latest files.
Important: the bootloader code was changed (for v1.05) to correct the reset behaviour, so make sure you have the latest version, not the one from the Nuts & Volts website. The update was passed to the N&V site admin, but I can't control if and how they may make it available.
Since publication in Nuts & Volts, the changes listed below have been made. Click here for the latest project files.
Software enhancements and bug fixes