Jump to content

alexglvr

Members
 View Profile  See their activity

  • Posts

    33

  • Joined

  • Last visited

 Content Type 

Posts posted by alexglvr

  1. Mios8 and custom program : is it possible?

    in MIDIbox Tools & MIOS Studio

    Posted

    Hello,

     

    I used a pic based Core to make a midi pedalboard. 

    As I know how to use PIC micro controllers and that I needed very special features, I developed my own code (from scratch).

     

    In order to be able to update my pedalboard software if needed, without having to open the enclosure each time, I thought implementing a boot loader.

     

    Mios 8 is ready to use, with midi functionalities, and it could be a good solution...

     

    Just One question :

     

    Can I use it with my custom program or is it only working with Mios dedicated programs? 

     

    All configuration are made by my program. It is fully standalone.

    Therefore, after Mios procedure, my program must be loaded and executed as if Mios was not there...

     

    Is it what it does?

     

    Thank you for your help,

     

    Alexandre 

  2. Midi Event processor project

    in Design Concepts

    Posted

    Hello,

     

    I need for my guitar Rig something I will call a MIDI Event processor.

     

    The goal is to scan the midi message and on some MIDI events, generate several pre-programmed midi command.

     

    After a long search not he internet, I found only one solution from "MIDI Solution", but the number of preset is too limited for my application.

     

    Therefore, I am exploring using uCApps solutions to make it.

     

    As I only know the Pic based core which I used for several applications, I would like to have your advise and be sure the STM32F4 Core can fit my needs.

     

    1.For the programming interface I will need

     

    - 1 or 2 rotary encoders

    - a few (less than 10) switches

    - a graphical LCD display (192x32 based on the ST7920)

     

    2. For MIDI, one MIDI_IO module should be nice

     

    3. The USB connection and SD card interface can also be quite interesting.

     

    I suppose that STM32F4 core can support all that in the same time, but I would like your confirmation please?

     

    Now, the "big" problem is the memory.

    I need to store in the beast the presets.

     

    Each preset will be around 256 bytes (trigger, order to send, preset name, etc…)

    if I want 256 possible presets, it gives a total memory of 64kbytes.

     

    Can I use the STM32F4 Flash memory to store my presets or is it fully used by the program?

     

    Thank you for your help,

     

    Alex

     

     

     

     

  4. Midi message sender channel !

    in Design Concepts

    Posted

    Ok !

    So if I want to build a midibox that receives orders from two different pedalboard, I see two possibilities:

    1- The two pedalboards plugged on a midi merger, and the output of the midi merger to the MIDIBOX

    2- Make a two port midibox. In this case, it could even use a single channel isn't it?

  5. Midi message sender channel !

    in Design Concepts

    Posted

    Thank you for your Help!

    I read several documentation on Midi but things are still a bit confused...

    Each midi component is attributed a midi channel !

    But, this channel is only usefull for midi in, isn't it?

    But for example, for a midi keyboard with a midi-in and a midi-out, how does it work?

    If it is attributed channel 1, it sends midi orders on channel 1 and receive order on channel 1?

    In fact I am completely lost... lol

    Alex

  6. The Pedal Box and Pedal Board Thread

    in MIDIbox User Projects

    Posted

    Hello,

    My name is Alex, and I am working on a Midi Pedal Board project.

    For this, I get an old ENGL Z12 midi footswitch, that I emptiied to keep only the enclosure and the switches !

    As I do not have much room in the enclosure, I will go for a custom PCB made with CMS components...

    Here is what I have :

    - 1 MIDI in PORT

    - 1 MIDI out PORT

    - 4 analog inputs (for external expression pedal / switchs, 2 TRS jack)

    - 12 input switches : 10 for midi message, 2 for bank up/down

    - 8 relays : 4 for external switching (2 trs jacks), 4 for 2 FXLoop (2x 4 TS jacks)

    - 16 Leds : 10 for midi switches, 4 for the relais, 2 for the FXloop

    - 2 seven segment digit that will be used to show the current bank number

    As I am making my own PCB, I thought adapting the Core whilestaying as compatible as possible with the original design...

    Here is what I was thinking :

    Schematic

    Is it a good configuration?

    Thank you for your help !

    Alex

  8. PIC EEPROM

    in Parts Questions

    Posted

    Which PIC do you want to use?

    MIOS supports the PIC18F452, PIC18F4620 and PIC18F4685. Any other PIC device would require possibly significant changes to MIOS.

    Cheers

    Phil

    I would like to use a PIC with USB 2.0 capabilities... I know I will have to nearly reprogram the entire MIOS but i am used to PIC development...

    Cheers,

    Alex

  9. PIC EEPROM

    in Parts Questions

    Posted

    You do not need to add any EEPROM.. it is already inside the PIC.

    As far as I can tell, MIOS does not use the EEPROM for anything.

    it DOES use the 8 bytes marked as "ID Locations" to designate the core ID, display and communications type, and IIC address. The correct values for those addresses can be worked out from the app at SmashTV's website.

    For the most common uses, the eight ID bytes should be set to zero.

    Have Fun,

    LyleHaze

    Ok so with some modification using a PIC with NO EEPROM memory should work...

  10. PIC EEPROM

    in Parts Questions

    Posted

    Hello,

    The PIC based core uses a PIC18F452 which has 256 bytes of EEPROM Memory.

    I was wondering if this EEPROM was mandatory to build a midibox?

    If yes, could you please tell me what is it used for?

    Thank you for your help,

    Alex

  11. driving a cable...

    in Design Concepts

    Posted

    Hello,

    i am working on a project, and i need help to design it, please!!

    The goal is to use the midi protocol to command the volume of Audio links (electric guitar type).

    For this, i will certainly use the pga4311 chips...

    My question is this one:

    The cable plug on my system can reach quite long distances (15m or so). How to know if the pga4311 can drive that, or if i need a driver/buffer chip???

    Another question (which in fact is the same i think) : when designing a midi out module, how to compute and design the signal driver placed just before the plug?

    thank you for your help,

    Alex

  12. The Pedal Box and Pedal Board Thread

    in MIDIbox User Projects

    Posted

    Hello,

    I am about to make a Pedal Board to command my guitar amplifier and my multieffect rack.

    As i didn't manage to find a proper enclosure, i thought using a line6 fbv or fbv shortboard.

    I then have the choise between two options :

    - find a way to plug the line6 fbv on a pedalBox

    or

    - empty the fbv to keep only the switches, enclosure and expression pedals, and to put inside the pedalboard electronic.

    The second solution seems to be easier isn't it?

    Thank you for your advises.

    Alexandre

  15. A electronic Pipe Organ (Photos)

    in MIDIbox of the Week

    Posted

    Hello,

    My Father being a Pipe organ player, he decided, a few month ago, to built an electric classic organ to practice at home.

    The 4 Keyboards were made by Hoffrichter.

    The software used is Hauptwerk, running under WinXP Pro on a dual processor computer

    (2Go Ram, E-MU sound Card).

    The Wooden console was hand made by my father.

    The Midi project was to command the sound selection using Stops knobs (like in church organ).

    This was made using the MidiIO128 project.

    As I got lot's of help from the ucapps forum to realize this project, i wanted to post some photos for you.

    Here is the Finished Organ:

    VueFace.JPG

    Here is the detail of the Stops Knobs Switch Matrix

    switches.JPG

    At the bottom of this matrix, one per side, A MidiIn Card...

    Midi_In.JPG

    Now, the system mounted with the Stops Knobs....

    Cam.JPG

    A Zoom...

    CamZoom.JPG

    Thank you again for your Help. Without you, it wouldn't have been possible....

    VueCote.JPG

    Regards,

    Alex

  18. Midio128: how to change the midi channel???

    in Design Concepts

    Posted

    Hello,

    I i put on my midi128 today, load the mios and the given .hex file.

    Everything is working well....

    The only problem, is that midi channel 1 is already used by my keyboard (hardware defined, impossible to change...)

    I surched on ucapps and the forum, and here is what i anderstood:

    I must change all the midiIN Configuration in the midiio128.ini, (replacing 90 xx by 96 xx (to have midi channel 7)), rebuild the .hex file and reload it...

    I am right?

    Is there an easyer solution?

    Thank you for your help,

    Alex

  22. Just to be sure

    in Design Concepts

    Posted

    Hello,

    I am wiring the midibox this week end. It is to select the sound of an electronic classic organ. Therefore, i will not send pulse to the Midi cards, but the switch will stay on for the time the sound is used.

    My question: Will it send only one message when the switch state changes or will it keep sending message (which i do not want....) as long as the switch is on?

    I read that on the web site : "If the status of an input pin has been changed, the program searches for the predefined MIDI event in a big table and sends it out:"

    I wanted to be sure....

    Thank you for your answers,

    Alexandre

×
×
  • Create New...