Trait embedded_hal::qei::blocking::Qei[−][src]

pub trait Qei {
    type Error: Debug;
    type Count;
    fn count(&self) -> Result<Self::Count, Self::Error>;
    fn direction(&self) -> Result<Direction, Self::Error>;
}

Expand description

Quadrature encoder interface

Examples

You can use this interface to measure the speed of a motor

extern crate embedded_hal as hal;
#[macro_use(block)]
extern crate nb;

use hal::qei::blocking::Qei;
use hal::timer::nb::CountDown;

fn main() {
    let mut qei: Qei1 = {
        // ..
    };
    let mut timer: Timer6 = {
        // ..
    };


    let before = qei.count().unwrap();
    timer.start(1.s()).unwrap();
    block!(timer.wait());
    let after = qei.count().unwrap();

    let speed = after.wrapping_sub(before);
    println!("Speed: {} pulses per second", speed);
}