Help using KE with Montsinger Rebound keymap

[labodeguitadelmedio]

Hi, having issues getting started with using my Rebound keymap (https://github.com/labodeguitadelmedio/zmk-nn-rebound) in KE.

Short version is that loading my repo in the editor results in a 'No Layout Found' error, and for many reasons I'm stumped about how to fix this. My repo's a fork of a fork, and at least the OG repo looks to have been basically abandoned, meaning I can't find existing layout files.

The Rebound is also a bit unusual in that the bottom row's layout can be adjusted and can be any of the following (per side):

• 6x 1u keys
• 4x 1u, 1x 2u centre key (spacebar)
• 1x 1u, 2x 1.5u, 1x 2u centre key
• 1x 1u, 2x 1.5u, 2x 1u centre keys

...you get the idea.

The matrix is set up so that on the key tester the 1.5 keys activate (moving inwards) the keys in columns 2 and 4 of the row, and the 2u spacebar activates the column 6 key, so it's possible to create a keymap with just a 1u layout. But beyond that, it seems creating a shield means knowing which pin each column/row corresponds to, and I'm not sure how to (accurately) work that out from the info I do have.

Oh, and there's also a middle column, and the option for an encoder. :)

I am not especially technical at all (hence: using KE to create some ridiculous-to-outsiders behaviours on my Corne) and I'm struggling. I can't work out if I need to somehow create a shield or not, and if so where to even start given all the above?

Any help very much appreciated! Thank you for making such a great app :)

[nickcoutsos]

How's this?

You can use the following layout by putting it in config/rebound_v4.json in your repo:

{
  "id": "rebound_v4",
  "name": "Rebound V4",
  "layouts": {
    "default_transform": {
      "layout": [
        { "row": 0, "col":  0, "x":  0, "y": 0 },
        { "row": 0, "col":  1, "x":  1, "y": 0 },
        { "row": 0, "col":  2, "x":  2, "y": 0 },
        { "row": 0, "col":  3, "x":  3, "y": 0 },
        { "row": 0, "col":  4, "x":  4, "y": 0 },
        { "row": 0, "col":  5, "x":  5, "y": 0 },
        { "row": 0, "col":  7, "x":  7, "y": 0 },
        { "row": 0, "col":  8, "x":  8, "y": 0 },
        { "row": 0, "col":  9, "x":  9, "y": 0 },
        { "row": 0, "col": 10, "x": 10, "y": 0 },
        { "row": 0, "col": 11, "x": 11, "y": 0 },
        { "row": 0, "col": 12, "x": 12, "y": 0 },
      
        { "row": 1, "col":  0, "x":  0, "y": 1 },
        { "row": 1, "col":  1, "x":  1, "y": 1 },
        { "row": 1, "col":  2, "x":  2, "y": 1 },
        { "row": 1, "col":  3, "x":  3, "y": 1 },
        { "row": 1, "col":  4, "x":  4, "y": 1 },
        { "row": 1, "col":  5, "x":  5, "y": 1 },
        { "row": 1, "col":  6, "x":  6, "y": 1 },
        { "row": 1, "col":  7, "x":  7, "y": 1 },
        { "row": 1, "col":  8, "x":  8, "y": 1 },
        { "row": 1, "col":  9, "x":  9, "y": 1 },
        { "row": 1, "col": 10, "x": 10, "y": 1 },
        { "row": 1, "col": 11, "x": 11, "y": 1 },
        { "row": 1, "col": 12, "x": 12, "y": 1 },
      
        { "row": 2, "col":  0, "x":  0, "y": 2 },
        { "row": 2, "col":  1, "x":  1, "y": 2 },
        { "row": 2, "col":  2, "x":  2, "y": 2 },
        { "row": 2, "col":  3, "x":  3, "y": 2 },
        { "row": 2, "col":  4, "x":  4, "y": 2 },
        { "row": 2, "col":  5, "x":  5, "y": 2 },
        { "row": 2, "col":  6, "x":  6, "y": 2 },
        { "row": 2, "col":  7, "x":  7, "y": 2 },
        { "row": 2, "col":  8, "x":  8, "y": 2 },
        { "row": 2, "col":  9, "x":  9, "y": 2 },
        { "row": 2, "col": 10, "x": 10, "y": 2 },
        { "row": 2, "col": 11, "x": 11, "y": 2 },
        { "row": 2, "col": 12, "x": 12, "y": 2 },
      
        { "row": 3, "col":  0, "x":  0, "y": 3 },
        { "row": 3, "col":  1, "x":  1, "y": 3 },
        { "row": 3, "col":  2, "x":  2, "y": 3 },
        { "row": 3, "col":  3, "x":  3, "y": 3 },
        { "row": 3, "col":  4, "x":  4, "y": 3 },
        { "row": 3, "col":  5, "x":  5, "y": 3 },
        { "row": 3, "col":  6, "x":  6, "y": 3 },
        { "row": 3, "col":  7, "x":  7, "y": 3 },
        { "row": 3, "col":  8, "x":  8, "y": 3 },
        { "row": 3, "col":  9, "x":  9, "y": 3 },
        { "row": 3, "col": 10, "x": 10, "y": 3 },
        { "row": 3, "col": 11, "x": 11, "y": 3 },
        { "row": 3, "col": 12, "x": 12, "y": 3 }
      ]
    }
  },
  "sensors": [  { "ref": "encoder", "name": "encoder", "identifier": "encoder", "compatible": "alps,ec11", "enabled": true }]
}

[labodeguitadelmedio]

Hello - I can see the layout now, thank you. Didn't think that part would be so straightforward given what the tutorials said! (I'm now getting errors elsewhere, but I don't think that's anything to do with KE...)

Is it hypothetically possible to switch between the various layouts on the fly? If so what's the most effective/straightforward way of achieving that - is using multiple .json files a thing, for example?

[nickcoutsos]

Which tutorials are you referring to?

Per your other question, it depends on what you mean about switching "on the fly"

• If you have keymaps for multiple keyboards in your repo (eg, rebound_v4.keymap and corne.keymap) you can switch between them in the app
• If you mean loading a keymap for a corne keyboard and switching from a 6-column layout to 5-column or vice versa, not so much

To build on that latter point, building a keymap with an alternate layout means either

1. Pointing to a different matrix transform and adjusting your keymap's layers to use the correct number and arrangement of bindings
2. Keeping the same matrix transformation but using a layout that "hides" keys that aren't relevant

Neither of these is on the fly. Maybe a close third option is to have your different layouts and keymaps in git branches, but that's not on the fly either since you'd always have to manually sync keybind changes between them.

[labodeguitadelmedio]

Which tutorials are you referring to?

General tutorials on how to set up zmk shields, eg. this yt one. I was getting stuck on how to list the matrix and pins for each row/column in the overlay file, especially seeing as Rebound doesn't appear to be using 4 pins for rows and 13 pins for columns (more like 8 for rows and 7 for columns).

That said, it became clear my fork (and the source) were too deprecated to salvage. So I've created a new repo forked from the universal template, using the .json and files copied from here (which includes an overlay file). Seems to be compiling alright at least.

Per your other question, it depends on what you mean about switching "on the fly"

* If you have keymaps for multiple keyboards in your repo (eg, `rebound_v4.keymap` and `corne.keymap`) you can switch between them in the app

* If you mean loading a keymap for a corne keyboard and switching from a 6-column layout to 5-column or vice versa, not so much

I meant the latter, and only as a feature within KE itself pre-compiling - eg. switching from 6 to 5 column corne, as you can in the keymap layout tools. Makes sense if it's not possible (esp as it's also possible to have a different layout on each side) - was more curious than anything :)

Thank you for your help! I really appreciate it.