stepgen

Stepper motor speed ramp generator.

Given acceleration, target speed and target step to stop at, generates acceleration or deceleration profile for the stepper motor, in the form of delays between steps.

Uses algorithm from "Generate stepper-motor speed pro les in real time" paper by David Austin.

Examples

use stepgen::Stepgen;

let mut stepper = Stepgen::new(1_000_000);

stepper.set_acceleration(1000 << 8).unwrap(); // 1200 steps per second per second
stepper.set_target_step(1000); // stop at step 1000
stepper.set_target_speed(800 << 8).unwrap(); // 240RPM (4 turns per second)

// Take 99 steps
for _ in 0..99 {
    println!("{}", stepper.next().unwrap());
}

assert_eq!(99, stepper.current_step());
assert_eq!(113621, stepper.current_speed());
assert_eq!(2242, (stepper.next().unwrap() + 128) >> 8); // delay for 100th step, rounded to nearest integer

Note on numbers

In few APIs, stepgen keeps numbers as fixed-point numbers, using least significant 8 bits for the fractional part and the remaining bits for the integral part.

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.