golemparts/rppal

Error: Io(Os { code: 2, kind: NotFound, message: "No such file or directory" })

RNGKing opened this issue · 7 comments

RNGKing commented

When I run the 0.11.3 build on a Raspberry Pi 4B I get a weird error.

Cargo.toml

[package]
name = "gpio_test"
version = "0.1.0"
authors = ["pi"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
rppal = "0.11.3"

Running the example code yields the following results:

use std::error::Error;
use std::thread;
use std::time::Duration;

use rppal::gpio::Gpio;
use rppal::system::DeviceInfo;

// Gpio uses BCM pin numbering. BCM GPIO 23 is tied to physical pin 16.
const GPIO_LED: u8 = 23;

fn main() -> Result<(), Box<dyn Error>> {
    println!("Blinking an LED on a {}.", DeviceInfo::new()?.model());

    let mut pin = Gpio::new()?.get(GPIO_LED)?.into_output();

    // Blink the LED by setting the pin's logic level high for 500 ms.
    pin.set_high();
    thread::sleep(Duration::from_millis(500));
    pin.set_low();

    Ok(())
}

The results are in the attached image.

image

Whenever I test the GPIO with the pre-loaded python library I have full access to the pins. Is there something I'm missing or is there some permission that I need to give?

RNGKing commented

EDIT : Raspberry Pi 4B

RNGKing commented

Second Edit : my provided Cargo.toml file reads incorrectly, it doesn't work on that version either.

golemparts commented

This is fixed in the current master branch, and will be part of the 0.12.0 release, which will be available soon.

For a temporary fix, you can point your rppal dependency to the github repo until the next version is released by replacing the line in your Cargo.toml with rppal = { git = "https://github.com/golemparts/rppal.git" }

  • 👍1
RNGKing commented

@golemparts Thanks for the response. I was pulling my hair out thinking that I might have broken something on my end of things.

bammi commented

Thank you @RNGKing that fixed the problem for me too for Raspberry PI 4 #75 Appreciate your help,

cheers, bammi

drauschenbach commented

I am still experiencing this error message in 0.12.0, using a Pi 4 8GB and latest Raspberry OS 32-bit. Although I'm using the Pwm functions, not the Gpio functions.

Error: Io(Os { code: 2, kind: NotFound, message: "No such file or directory" })

Code:

let pwm = Pwm::with_frequency(Channel::Pwm0, 25000_f64, 1_f64, Polarity::Normal, true)?;
drauschenbach commented

I was missing a /sys/class/pwm/ directory. I found how to enable the missing driver here.

$ vi /boot/config.txt
dtoverlay=pwm,pin=18,func=2
$ sudo reboot now
  • 👍5