borfo

Programmer
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About borfo

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    MIDIbox Tweaker

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  • Location Toronto

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  1. I’ll take a PIC programmed with boot loader if you still have one. I’m in California...

  2. pre-programmed PIC 18F4685 for sale

    Looks like shipping from here to the states with a tracking number might be about $14CDN - without a tracking # would be about $7.  (seems expensive for such a tiny parcel - not sure if I could squeeze PICs into lettermail though...)Jaytee, buying from Ilmenator seems like the right move...     Within Canada would be a lot cheaper, if any Canadians need PICs. 
  3. pre-programmed PIC 18F4685 for sale

    Yes, once the bootloader is on the PIC you can upload everything else through MIOS Studio.
  4. pre-programmed PIC 18F4685 for sale

    @jaytee - where are you located?  Unless you're in Toronto and want to pick them up, let's see what @ilmenator can do for you shippingwise first since it's his thread. 
  5. pre-programmed PIC 18F4685 for sale

    I have a few as well (3, I think, flashed with MIOS) that I could also get rid of to people who aren't anywhere near Germany ...  I'm in Toronto.
  6. MIDIbox as base for touch GUI music project

    Have you looked at http://www.ucapps.de/ yet, or just the forums?  There are several midibox synths.  The Midibox SID is a commodore SID synth; there's an FM synth.  Midibox CV V2 isn't a synth, but it's also interesting: http://www.ucapps.de/midibox_cv_v2.html.  If you look around the wiki http://wiki.midibox.org/ and old forum threads, you can find a bunch of examples of people making custom synths and MIDI controllers with features that didn't previously exist in MIOS. You are not restricted to the API in MIOS - take a look at the app.c files in some of the projects (eg: http://svnmios.midibox.org/filedetails.php?repname=svn.mios32&path=%2Ftrunk%2Fapps%2Fcontrollers%2Fmidibox_ng_v1%2Fsrc%2Fapp.c) - there are a bunch of hooks in that file that you can use to launch custom stuff.  
  7. Solved - it was the power supply, and presumably a repeated rebooting of the PICs due to undervoltage.  Got a new C64 PSU and everything worked fine - flashed MIOS and then the SID application...  Thanks for the help everyone.
  8. I'm thinking about modifying MBNG slightly to control a headless/knobless audio mixer I'm building (the plan was always to make it a MIDI-controlled device, controlled from external software or hardware I want to build a UI for, but I thought why not use the NG itself if possible...)  The NG would serve as the control interface for the mixer (as well as doing other stuff, controlling synths, whatever you'd normally do with it).  The mixer controls would send MIDI (OSC could work too, but instead of leaving the device via an out port, I'd like to send to one of the NG's own in ports.  That way I could use the APP_MIDI_NotifyPackage(mios32_midi_port_t port, mios32_midi_package_t midi_package)  hook in app.c to monitor for incoming MIDI control signals meant for the mixer (including MIDI sent from the NG itself, as well as any external mixer control signals that I might send in from other devices.)  If a mixer control message is found, the NG would send a control signal to the mixer hardware via I2C. Can the NG send MIDI to itself in a way that would be caught by the APP_MIDI_NotifyPackage hook?   I suppose I could physically connect an NG out port to one of its own in ports, but it'd be cleaner to do it internally...   Also, is it possible to access values of Midibox NG control elements (like, the current value of an encoder for example) from within app.c?  
  9. Yeah, but better to pay shipping than to pay full price I guess. Hm...  The laptop PSU option is interesting...  I have a Surface Pro power supply here that puts out 12v and has a USB charging port.  Do you just wire your laptop power supply directly into the 5v and 12v rails?  Or do you run it through linear voltage regulators?  Are laptop power supplies internally regulated?  What PSU are you using?
  10. Just got in touch with the person who sold me this PSU - they're going to send me another for shipping cost, so hopefully third time lucky!  haha.  If that doesn't work, I'll go the PSU option E route.
  11. Yeah, probably should just bite the bullet and do PSU option E.  I've got both 12v and 9v SIDs in this thing, so that'll be two switching regulators, unfortunately.  At this rate I'm going to wind up spending more on power supplies than on the whole device...  haha. 
  12. Could I use separate power supplies (a 9vac PSU and a 5vdc PSU) plugged into the same mains power source?  Would that work, or would I have to worry about the possibility that they'd have different ground references (and potentially unexpected voltage differentials) despite being plugged into the same mains power source/ground?    ...I've got one C64 psu with working 9vAC and broken 5vDC, and another with working 5vDC and broken 9vAC...  
  13. Argh.  Looks like that's it right there.  I just read directly from the PSU pins and I'm only getting 4v (not sure why I didn't read straight from the PSU before, I guess because the SID board was already wired up and I read 4.6v on the 5v rail there).  Frustrating - this is the second one I've bought.  I guess they're all pretty old and deteriorating at this point...   I guess I'll work on another power solution.  Thanks a lot for the help, Noise Generator.
  14. Thanks everyone - I was thinking it might be restarting over and over again as well.  The MIDI circuit seems fine (I've tested it in a variety of ways, and I do get communication back and forth from the core including confirmation in MIOS Studio that the bootloader is running). Power is coming from a C64 PSU, so the 5v rail is regulated within the PSU.  Unfortunate if it's not working properly, since this is the second one I've bought (AC on the first one was broken), and they're not cheap. I suppose building a minimal core on a breadboard is probably the sensible next step, and then if it is the PSU I guess I'll power it some other way, since the C64 PSUs seem a bit unreliable.
  15. I'm reading 4.62v on the 5v rail, 8.83v on the 9v rail and 11.76v on the 12v rail - can anyone confirm whether those numbers are ok? I just tried flashing the bootloader under a WinXP Virtual Machine, with the same result...  "upload request" messages about 120 times per second, and I can't upload via midi.