FantomXR

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Everything posted by FantomXR

  1. OLED shows noisy-output

    Yeah. You were absolutely right! The last days I had no time to connect both cores... but today I checked everything.... man...
  2. OLED shows noisy-output

    Hey people, I need you experienced guys! I've made a mios32-Core by myself which I test at the moment. While the first one works great. The second one causes trouble. And I don't know why.  Please see the picture attached. Does anyone have an idea where the noise on the displays come from? I used this OLED-breakout (it contains OLEDs, Reset-circuits (Cap & Res) & Shiftregister) in some other projects already and it worked fine. So I assume the mistake is somewhere on the core. But as I said: Another identical core runs fine... Could it be the STM that is damaged?  To be sure, that the mistake is not on the 9x OLED Breakout, I also tried it with an OLED with Reset and shiftregister on the breadboard. Same here... I now searched for about eight hours and also searched with an oscilloscope, but I was not able to locate the problem.  Thank you very much! Best, Chris
  3. OLED shows noisy-output

    Oh my god! This is embarrassing. I forgot to set the correct width and height in the bootloader.... I worked with OLEDs already a dozen times... I wonder how I was able to overlook that! Thanks for your help!  
  4. OLED shows noisy-output

    Which app do you mean? As the resistor-network is on the same PCB as the OLEDs and the PCB works great with another core, this shouldn't cause any problems.  I'll check again all connections and soldering...
  5. OLED shows noisy-output

    Yes. USB power on both cores.
  6. OLED shows noisy-output

    No. The same oled-breakoutboard works on another core. So I don't think it's a defective display. @Antichambre But still: Why does that happen only on that core? The other one runs fine. Which modification do I have to make in the firmware to clear it correctly? Could you help me with that? Thanks guys!
  7. Relocation of keybed from main board not working

    Hi and welcome to the forum! Well, to be honest I can not believe, that a ribbon cable with this length stops working completely.  Are you sure that the ribbon cable has the correct orientation? I made this mistake often in the past. In general it's a twisted cable (one connector looks up, one connector looks down, cable straight). Pictures might help!
  8. Maximum number of MID I/O?

    I know that. But my use-case still is different and I don't like the big connector :-)
  9. Maximum number of MID I/O?

    Hey people, just a simple question: I have a use-case where I need 8 MIDI I/Os. Is this possible with the STM? What I read on ucapps is, that 4 I/Os are maximum. I wonder if there is an option to extend those MIDI I/Os. Thanks, Chris
  10. Maximum number of MID I/O?

    Yeah! It’s not “real” Ethernet. But it seems to be a great option! Everything in one Cable (In / Out / Power).  I today finished the reverse engineering of the official GM5-PCB from ucapps. From there I’ll create my special PCB. 
  11. Maximum number of MID I/O?

    Although I have a RTP-OEM I will not use it in this case.  I’ll use 2xGM5, which gives me 10 MIDI I/Os in total.  I found that page which shows an easy way, how to transform MIDI into Ethernet and back to midi: https://www.edn.com/design/consumer/4368054/Send-MIDI-signals-over-long-distances Only a few parts are needed. Seems to be perfect because I still have some pins on the Ethernet-connector left to also transmit +5V and GND. 
  12. Maximum number of MID I/O?

    Not yet. But as I said: I don’t need classic midi in / miidi out. I need Ethernet :-)
  13. Maximum number of MID I/O?

    Thanks for the link! This is not what I need. I need to make my own PCB because I'll integrate a circuit that allows transmitting MIDI over 50m via Ethernet. I'll just take two GM5 and I'm fine. That should work! :-)
  14. Maximum number of MID I/O?

    Hey! Thanks! I just discovered, that Ploytec sells the GM5 in sets of 5 for 33€/5pc. I think I will take that solution! 
  15. mnmlCore

    Using a 405 instead of 407 makes no sense to me. 407 costs just 2€ more. 
  16. mnmlCore

    Do we need to adapt the firmware when using a smaller STM or can we use it as is?
  17. mnmlCore

    So, how do we proceed? What are the next steps for this project?
  18. mnmlCore

    And the next question would be: Why? Does someone run the STM-Core at its limits? The STM32F407 is a beast and powerful and maybe already an overkill for “just midi”. :-)
  19. mnmlCore

    At first we should discuss the sense of that board. Should it be a pin-compatible replacement for the Core8? If yes, the feature-list is fixed.  Adding SMD-optos is no problem. My MIDI-PCB is already full-SMD.  Regarding PCB-manufacture: I order my PCBs at elecrow with very good results! So I'd suggest them.  You asked me about 3V3: The PCB has a 3V3 power plane as well as a GND plane.  In the wiki you wrote, that a programmer is needed. If I assemble those PCBs I'd program them with the MIOS bootloader so you don't have to do it.  I'll have a look into my designs and see if I can upload another eagle-file which contains the newest core design (with SMD crystal, etc.) If having a small footprint the the main-goal in this design we should think about replacing the IDC headers with micromatch-headers. Smaller footprint and smaller connector-type on the cable-side. 
  20. Another MIDIbox core

    Hey people, since I'd like to be independent from the availability of the STM32F4-discovery board I started designing my own board, which has an STM32F407VGT6 on board. Its an LFQP 100 package, so not easy to solder. I have a reflow oven and the first PCB I made seems to work fine. The PCB has very few components. This was just a quick test board to see if the basic circuit of the STM32F4 is working. It's basically just the STM itself and it's components like caps and crystal. Also there is a 3.3V regulator (based on 1117 but will change to TC2117) to power the uC. I added a pinheader for USB connection (on the very left), a pinheader for SWD to flash the bootloader and a reset-header.  On the right you see the HCT541, which connects to J8/9 (tested: works fine). Also I added an MCP3208 and HC595 for an AINSER64-like-analog-scanning.  On the bottom of the PCB there is a MicroSD-slot.  No changes in the firmware are needed to use this. The only thing one need to do is flashing the bootloader the first time. @latigid on made a nice "how-to": http://wiki.midibox.org/doku.php?id=wcore After that you can use the MIOS as is. So, why I'm telling you this?  This core is already very specific for my applications. But if you are interested I could upload the minimal circuit for the STM32F4 to work and you could add all headers and components that YOU need by yourself. So in theory you could recreate the original MIDIbox core but you should end up with a much smaller footprint (especially regarding height).  If you need assistance regarding soldering the STM32F4 I can offer to reflow-solder it for you.  I'll clean up my circuit and upload it the next days!   Best, Chris
  21. Another MIDIbox core

    I took a look at the Core8 and I'd say that it should be possible to create a PCB with the STM with that size and the same pinout. Not sure if it makes any sense though.  Anyway: If we want to use my pick & place machine it's good to have 5 PCBs or more of the same type at the same type.  Are you guys familiar with routing and creating PCBs? Who wants to do it?
  22. Another MIDIbox core

    I'm happy to help you if you need some assistance.  You are welcome to start a new thread I'll join in.
  23. Another MIDIbox core

    To be honest I can not follow you. I improved the design which I published here and used that in my other designs which I don't want to make open source. For example I changed the oscillator to SMD, I changed all none-VDD-traces to 0.2032mm, I changed all vias to round-style and 0.32mm diameter. I removed the ID-pin from USB. I added an inductor behind the USB connector for EMC-improvements. Also I changed all 0603 SMD parts to 0805. Those are a few changes I made in my other designs. 
  24. Another MIDIbox core

    Since I just received the PnP machine last week I don't have enough experience yet to give you informations about prices. But yes: The PnP machine places all SMD parts which are not too high f.e. electrolytic capacitors. I didn't try double-side-partmounting yet.  Regarding your comments: I use external optocoupler for MIDI I/O Micro-SD Slot is on the back of that PCB J6 & J7: I made some pcbs with faders which I connect directly to that connectors.  There is no "current" version. It's a proof of concept, which worked. So I used the circuit around the STM provided in this design here in my other projects.