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Gate Input

Generic class for handling gate/trigger inputs through GPIO (Eurorack gates, triggers, etc.)

Features:

Trigger detection (rising/falling edge)
State reading (high/low)
Optional inversion (for BJT input circuits)

Usage:

import nimphea/hid/gatein

var gate: GateIn
gate.init(D0, true)  # Pin D0, inverted (typical for eurorack)

# In main loop
while true:
  if gate.trig():
    # Rising edge detected!
    echo "Gate triggered"
  
  let isHigh = gate.state()
  hw.delay(1)

Imports

nimphea_macros, nimphea

Types

GateIn {.importcpp: "daisy::GateIn", header: "hid/gatein.h".} = object: Gate input handler for eurorack-style gate/trigger signals Source Edit

Procs

proc init(this: var GateIn; pin: Pin; invert: bool = true) {. importcpp: "#.Init(#, #)", ...raises: [], tags: [], forbids: [].}: Initialize gate input on specified pin

Parameters:

pin - Hardware pin to use

invert - True if pin state is HIGH when 0V at input (default: true for BJT circuits)

Note: Default is true because typical eurorack gate inputs use inverting BJT circuits
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proc state(this: var GateIn): bool {.importcpp: "#.State()", ...raises: [], tags: [], forbids: [].}: Get current gate state

Returns: True if gate is currently high

Example:

let gateHigh = gate.state() if gateHigh: # Gate is high - sustain envelope, etc.
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proc trig(this: var GateIn): bool {.importcpp: "#.Trig()", ...raises: [], tags: [], forbids: [].}: Check if gate input just transitioned (edge detect)

Returns: True if gate just went high (rising edge)

Example:

if gate.trig(): # Trigger event - start envelope, increment step sequencer, etc.
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