Creating the TypeDef

An event-driven controller is a TypedObject: fields for pins/periphs and event sources, plus constants, then methods for handlers and init.

Use a paren-object spec and TypedObject.makeType^. Full example: examples/pi/led-btn-ctrl.fnl.

{
  "LedBtnCtrl" "name"
  {
    GpioPin "led"
    GpioPin "btnEnable"
    GpioPin "btnDisable"
    EventTicker "ticker"
    EventEscFn "escFn"
    Bool "blink"
  } "fields"
  {
    0 "idxEnable"
    1 "idxDisable"
    2 "ticksPerS"
  } "constants"
}
TypedObject.makeType^

Keep a global var holding the live instance so it is not garbage-collected while the EventLoop still has handlers pointing at it. Clear that var in your stop path.

null var: LedBtnCtrl_inst

See also TypedObject in the main guide.