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Topics - pld

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preenfm2 and preenfm3 / Possible arpeggiator modes/directions
« on: April 28, 2014, 11:06:45 AM »
Howdy all,

so while porting the 'chord' mode from MIDIpal yesterday I was playing around with these, but I'm not sure how useful they are since I'm coming at this mostly from a code point of view :)
I forget if these have a well-defined name, so if they do let me know...

1. cycle
Played notes: C-E-G
Result (up): C-E-G E-G-C G-C-E repeat...

2. cycle with octave (supercycle?)
Played notes: C1-E1-G1
Result (up): C1-E1-G1 E1-G1-C2 G1-C2-E2 repeat...

If that makes sense :)
They seemed to work for Down, U&D, and with the regular octave parameter as well.

Downside: an explosion of "Dire" entries if I add "UpCy", "DnCy", UDCy", "UpSc", "DnSc", "UDSc".
So during my morning commute I thought about just adding "Cycl", with a separate sub-page for editing, e.g. [ Dire (up,down,u&d), Octv (yes/no) ]
The "arp step sequencer" as suggested in the firmware thread is something I need to give some thought, but now that I'm thinking about it  :) it might provide similar effect if it has some kind of "offset" parameter as well. Hm...

Suggestions welcome :)

preenfm2 and preenfm3 / PreenFM2 with VFD (test)
« on: April 15, 2014, 09:30:34 PM »
I have a VFD (Noritake GU140x32f-7806) that's been gathering dust forever so I figured I might as well give it a try...
When I checked the datasheet it seemed easy enough, the dimensions and connection appear to be identical to the OLED Xavier is using for the new kits.
Except I had shortened the PCB for another project so I had to *ahem* improvise a bit...

The datasheet claims "LCD compatible" but of course it didn't work ::)
After hacking some timings in the firmware - I guess the LCD/OLED are more tolerant? - it seems to work. The photo isn't great, it looks much better live.
Not sure whether to keep it...
  • It does have a bit of noise (high-pitched) but that might be inaudible in a case...
  • The top of the display is almost flush with the buttons and ideally, there'd be a color filter or protection, so that might be more involved
  • It might be the improvised connection, but I think it flickers occasionally. Or it's just using 10x as much power ;)
  • But it's graphics capable so that could be fun :) (although a lot of work)

preenfm2 and preenfm3 / Woohoo, it works (after some doh! moments)
« on: March 10, 2014, 08:03:08 AM »
So I finally got around to finishing the kit, and it all works. Awesome, and thanks again for the quick replacement of the case panel.
It would have been working sooner but I made some totally avoidable mistakes on the way… it’s not like the instructions don’t explicitely mention not to mix up the headers ;)

Also, I got the source compiling and flashed a custom firmware that seems to work.
Still just poking around the source code but it’s a start :)


— Patrick

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