Struct RTrig 

pub struct RTrig {
    pub clk: bool,
    pub q: bool,
    /* private fields */
}

Rising Edge Trigger (R_TRIG)

Detects a rising edge (false → true transition) on the input signal. The output q is true for exactly one cycle when the input clk transitions from false to true.

This is equivalent to the IEC 61131-3 R_TRIG function block.

Example

use autocore_std::fb::RTrig;

let mut trigger = RTrig::new();

// No edge yet
assert_eq!(trigger.call(false), false);

// Rising edge detected!
assert_eq!(trigger.call(true), true);

// Signal still high, but edge already passed
assert_eq!(trigger.call(true), false);
assert_eq!(trigger.call(true), false);

// Signal goes low
assert_eq!(trigger.call(false), false);

// Another rising edge
assert_eq!(trigger.call(true), true);

Timing Diagram

clk: _____|‾‾‾‾‾‾‾‾‾|_____|‾‾‾‾‾
  q: _____|‾|_____________|‾|____

Use Cases

• Detecting button presses (trigger on press, not hold)
• Counting events (increment counter on each rising edge)
• State machine transitions

Fields

clk: bool

Current input value

q: bool

Output: true for one cycle on rising edge

Implementations

impl RTrig

pub fn new() -> Self

Creates a new rising edge trigger with all values initialized to false.

Example

use autocore_std::fb::RTrig;

let trigger = RTrig::new();
assert_eq!(trigger.q, false);

pub fn call(&mut self, clk: bool) -> bool

Executes the rising edge detection logic.

Call this method once per control cycle with the current input value. Returns true for exactly one cycle when a rising edge is detected.

Arguments

• clk - The current state of the input signal

Returns

true if a rising edge (false → true transition) was detected, false otherwise.

Example

use autocore_std::fb::RTrig;

let mut trigger = RTrig::new();

let button_pressed = true;
if trigger.call(button_pressed) {
    println!("Button was just pressed!");
}

Trait Implementations

impl Clone for RTrig

fn clone(&self) -> RTrig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RTrig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for RTrig

fn default() -> Self

Returns the “default value” for a type.