SetInterrupt for input with pulldown resistor about rppal HOT 3 CLOSED

I just tried this myself, and everything seems to work as expected. I connected one side of a button to GPIO 23, and the other side to 3.3 V. When I press the button, the interrupt triggers. For reference, this is the code I used:

use std::error::Error;

use rppal::gpio::{Gpio, Trigger};

const GPIO_BTN: u8 = 23;

fn main() -> Result<(), Box<dyn Error>> {
    let mut pin = Gpio::new()?.get(GPIO_BTN)?.into_input_pulldown();

    pin.set_interrupt(Trigger::RisingEdge)?;

    println!("Waiting for rising edge trigger...");
    pin.poll_interrupt(true, None)?;

    println!("Triggered!");

    Ok(())
}

If you're using the same code, I suggest checking your circuit for any accidental mistakes, or perhaps the tactile switch is faulty?

from rppal.

Hey there! My bad... It did work as described for other GPIO pins. I was having problems because I was trying it on BCM 2 and BCM 3 which are i2c SDA and SCL respectively. Those pins have fixed 1.8 kohms pull-up to 3.3v. I believe that was causing the issue.
Thanks!

from rppal.

Hah, that does indeed explain the strange behavior. Glad to hear you figured out the cause!

from rppal.