5-way tactile switch as input device sufficient?

How-to
1

Good morning everybody,

I would like to use lvgl in a hobby project with a common 1.14 inch 240x135px display and a 5-way tactile switch (https://tech.alpsalpine.com/prod/e/html/multicontrol/switch/skrh/skrhabe010.html) as input device.

I tried out the “lv_demo_keypad_encoder” example in the windows simulator. If my analysis of this example is correct, it would be a good idea to map the hardware switches as follows.

  • Switch up -->LV_KEY_PREV (and not LV_KEY_UP!)
  • Switch down -->LV_KEY_PREV (and not LV_KEY_DOWN!)
  • Switch left → LV_KEY_LEFT
  • Switch right -->LV_KEY_RIGHT
  • Switch center -->LV_KEY_ENTER

If I mapped the Switch up/down to LV_KEY_UP/DOWN, (e.g. if I only use the arrow keys in the windows simulation and NOT the “Page Up”/“Page Down” keys) it would not be possible to navigate between the widgets.

If I map the keys according to the list above, I found no way to modify the value in the spinner widget…

My question are:

  • Is a 5-way tactile switch basically sufficient to reach and edit all input widgets?
  • If no: which further buttons do you recommend?
  • If yes: What would be the best key mapping?

Thanks in advance!

Klaus

2

Hi, yeah, infact 3 state is enough too, if you map it as an encoder instead of keypad.

3

Hi Ali,
but this would mean, that two of the five switches are useless. Or do you recommend a “hybrid” mapping, e.g. three switches imitate encoder behaviour and the two remaining are LV_KEY_PREV/NEXT (or anything else?)?

Regards, Klaus