Recent content by frep

  1. frep

    Homebrew RetroArch Switch

    At https://docs.libretro.com/guides/roms-playlists-thumbnails/ you can find informations about the Filenames: The thumbnail file should exactly match the game's title as listed in the playlist with an important exception. The following characters in playlist titles must be replaced with _ in...
  2. frep

    Hacking WIP D.I.Y Payload/Dongle/Modchip Injector Thread.

    In general, you are correct. But in this case, the board behaves like @mrdude said. The powering of the board is controlled by the enable pin of the voltage regulator. The input voltage is permanently connected to the battery voltage, but the board is only powered, once the enable pin is set to...
  3. frep

    Hacking WIP D.I.Y Payload/Dongle/Modchip Injector Thread.

    The idea is to wire to all three buttons. As you have to press power and vol+, these two signals power the trinket on. the vol- button is used to reset the m0.
  4. frep

    Hacking WIP D.I.Y Payload/Dongle/Modchip Injector Thread.

    I did some small changes in my board and finally ordered it. :-D The new schematic looks like this: and the board like that:
  5. frep

    Hacking WIP D.I.Y Payload/Dongle/Modchip Injector Thread.

    Your cartrige-shaped dongle with included rcm-jig looks impressiv! Really nice done!
  6. frep

    Hacking WIP D.I.Y Payload/Dongle/Modchip Injector Thread.

    Thank you! I'm glad you like design :-) It's not yet ordered, so if you have some ideas for improvements to make it even better, there is still some time. I'll probably order the pcbs this weekend. Anyway, thanks for the feedback!
  7. frep

    Hacking WIP D.I.Y Payload/Dongle/Modchip Injector Thread.

    Here is my version of a trinket based modchip, with lot of support from @mrdude . Thanks for that! The key point, that this board addresses, is the power draw while it is not used. An improvement in this point is achieved by controlling the enable pin of the voltage regulator...
  8. frep

    Tutorial Internal modchip - SAMD21 (Trinket M0, Gemma M0, ItsyBitsy M0 Express) Guide, Files & Support

    I think you have marked the power button, not the vol+ button. (The side with the cable is power, IMO). Otherwise it seems good to me, to solder there, provided it is easy to get this button pcb out of the switch without taking everything apart. Any other opinions? Edit: Would make more sense...
  9. frep

    Tutorial Trinket Internal Install.

    @mattytrog thanks for your explanation! Now it makes much more sense! :-) Wouldn’t it be easier to set these signals (rcm@pin3 and vol+@pin0) at the beginning of the setup, delay a second and inject the payload after that? This way the bootloader could be unchanged, or is there a specific reason...
  10. frep

    Tutorial Trinket Internal Install.

    @M-O-B I study the arduino sketch you are using to adjust it to my custom board. With your sketch in mind, I doubt that your 5 wire install will work. The problem I see is the following: Pin 3 which is used to tie the rcm line down to ground is only set to low in the wakeup function, which will...
  11. frep

    Tutorial Trinket Internal Install.

    @mrdude Thanks! Yeah, I tried the circuit on the breadboard, and I will double check it there with the pcb. However, I assumed there, that all three buttons are floating, and go to ground once they are pressed. But true, it is fast checked with a multimeter, once the switch is open.
  12. frep

    Tutorial Trinket Internal Install.

    @mrdude I see, why the bat pin is better! I have here the "assembly" plan and the wiring diagram of chip. Could you double check the wiring diagram? Especially the buttons, I'm unsure. I think, the trace which connects the tree buttons is the ground line, so I have to solder on the other side...
  13. frep

    Tutorial Trinket Internal Install.

    Hey MrDude The short persists, but I think I have to blame my soldering... Although the pins look okay, it might be, that the pads under the pins could have a short (hard to see). Anyway, since I have enough parts, I soldered another board. I have to say, I'm getting better at soldering these...
  14. frep

    Tutorial Trinket Internal Install.

    Nice done! It seems that the second power connection stabilize the supply enough! Good idea! I soldered yesterday another board together, but I must had a shortcut, I didn’t noticed, while soldering the m0. :-( So sadly, it’s not working. I try to get another one done tomorrow. (With checking...
  15. frep

    Tutorial Trinket Internal Install.

    My custom boards arrived today, yeah! :-) Size comparsion with a trinket: Soldering the 48-TQFP was a pain... but after that, all the other components were no problem at all. For flashing the bootloader on the board, I used the j-link edu mini programmer (I will test other programmers...
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