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Simultaneous key presses

To build and run

sudo ./build_run.sh

Goal

Pressing j and k within X ms gives ESC. Where X is something small like 100 or 50.

For example:

                <---------100ms--------->     <---------100ms--------->
keyboard:       J↓      K↓              J↑       K↑
computer sees:          ESC↓            ESC↑

Behavior - 1 Key

<------ delay ------>
jd                              ju
                     jdR        ju
<------ delay ------>
jd      ju
        jd,ju
<------ delay ------>
jd    ad
      jd,ad
<------ delay ------>
jd    ad     ju  au
      jd,ad  ju  au
<------ delay ------>
jd    ad     au  ju
      jd,ad  au  ju

I think 4 and 5 work, i.e. same as if we would press m (instead of j) and a. Not 100% yet, let's see if something comes up later on.

Behavior - Two keys

<------ delay ------>
jd    kd     ku         ju
      Ed     Eu

How do we catch ESC repeat and send it through?

Possibly we have a state bool ESC_DOWN which if true and we are receiving j or k repeat (I guess we should choose either one not both?) then we send ESC repeat instead?

Example j+k to r

keyboard: jd -> kd (in threshold) -> ku -> ju
computer: -  -> rd                -> ru -> -