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New firmware hack version v3.01
  • awernerawerner

    Hi, I just put a new firmware version v3.01 for Meeblip SE V2 and Meeblip Micro in my github repository at https://github.com/ataweg/meeblip-synth. The most interesting features are:

    • Much more of the sound parameters can be controlled via MIDI. The extended MIDI mapping is based on the knobs and sliders of a QX49 keyboard.
    • 48 byte patches to support more midi parameter and switches.
    • More "hidden" knobs and switches controlled thru MIDI.
      • ADSR parameter for VCA- and VCF-envelop generators can be set directly thru MIDI (8 "hidden" knobs).
      • Add switches used in previous versions of meeblip (switch 3 and 4).
      • Master volume control via MIDI. It can also be raised the volume.
    • Noise generator now makes more or less white noise - new algorithm.
    • Ring modulator for metallic sounds.
    • Control mixer balance thru MIDI.
    • Some predefined patches.
    • Patch 1 has a default setting and can not be overwritten.
    • New mapping tables for various parameters.
    • Some code optimizations.

    The code was originally built for my version of a virtual analog synthesizers based on the Meeblip hardware. My source code, schematics and a little bit documentation can be found at https://github.com/ataweg/aweAvrSynth.

    Feel free to take a look into my hack and give me your feedback.

    Viele Gruesse Axel

  • awernerawerner

    Hi,

    I added a arpeggiator to my meeblip firmware hack.

    • new switches: DISTORTION => LFO_ENABLE, ARP_REPEAT => DISTORTION, ARP_ENABLE => FILTER_MODE

    • new knobs: ARP_RATE => upper OSC_B_DETUNE, ARP_THRESHOLD => PWM_WITDH

    Feel free to checkout the source from https://github.com/ataweg/aweAvrSynth.

    Prebuilds are available.

    Viele Gruesse Axel

  • ArvidArvid

    Great! This seems to call for an extended interface, or would you rather build the Meeblip into your QX49?

  • awernerawerner

    to control the extra switches and knobs I extended the python program meeblip-control of Bitrex. See https://github.com/ataweg/meeblip-control/tree/master/meeblipcontrol.

  • ArvidArvid

    I've never used Python before, but this seems interesting. Could you make a screenshot of the GUI?

  • awernerawerner

    Here some screenshots for the meeblip control GUI

    image

    image

    image

  • wtbgtrwtbgtr

    I borrowed and tweaked some of your code to try to make a MIXER_BALANCE slider, but I can't get it working right. I was wondering if you could take a look and tell me if there are obvious errors in it? I am an ASM newbie.

    The symptom is that while one end of the (midi) slider correctly gives me 100%A and 0%B, the opposite end of the slider seems to still give 100%A with some of B mixed in.

    Here are the relevant chunks of code: https://gist.github.com/wbajzek/5044513

  • awernerawerner

    in the code sniplet I missed a branch after line 15

        cpi r17, 0x29   ; MIXER_BALANCE
    brne    INTRX_CCEND

    see also https://github.com/ataweg/aweAvrSynth/blob/master/Firmware/aweMeeblipSE-v3.asm line 3129

    add the branch destination after line 35 in your code sniplet

        sts DCOB_LEVEL, r16 ; Store DCOB level(0..254)
INTRX_CCEND:
    pop r27 ; reload old contents of r27 and r26
    pop r26
    rjmp    INTRX_EXIT
  • wtbgtrwtbgtr

    It's not working, but thanks for the help. I am sure I screwed something else up and will just have to dig into it more.

  • awernerawerner

    if you send me your source code and the original code as private mail, can I try to find the problem. You can exclude the possibility that it is a hardware problem?

  • wtbgtrwtbgtr

    Thanks. I sent you a message.

  • awernerawerner

    get the update source from

    https://dl.dropbox.com/u/58086146/_support/meeblip-micro-william.asm

  • wtbgtrwtbgtr

    I got it, thanks. The control doesn't do anything now and I didn't have time over the weekend to look into it farther. I appreciate the help but I think maybe I just need to figure it out for myself rather than having you spend too much of your time on my problem.

    I do have one last question, though; what is the reason for this part? Why trim off the bottom range of the control?

    cpi    r17, $02
BRSH   SET_DCOA     ; skip if knob value >= 2
ldi   r17, $0
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