ionpak-thermostat/firmware/src/pid.rs

69 lines
1.7 KiB
Rust

#[derive(Clone, Copy)]
pub struct Parameters {
pub kp: f32,
pub ki: f32,
pub kd: f32,
pub output_min: f32,
pub output_max: f32,
pub integral_min: f32,
pub integral_max: f32
}
pub struct Controller {
parameters: Parameters,
target: f32,
integral: f32,
last_input: Option<f32>
}
impl Controller {
pub const fn new(parameters: Parameters) -> Controller {
Controller {
parameters: parameters,
target: 0.0,
last_input: None,
integral: 0.0
}
}
pub fn update(&mut self, input: f32) -> f32 {
let error = self.target - input;
let p = self.parameters.kp * error;
self.integral += error;
if self.integral < self.parameters.integral_min {
self.integral = self.parameters.integral_min;
}
if self.integral > self.parameters.integral_max {
self.integral = self.parameters.integral_max;
}
let i = self.parameters.ki * self.integral;
let d = match self.last_input {
None => 0.0,
Some(last_input) => self.parameters.kd * (last_input - input)
};
self.last_input = Some(input);
let mut output = p + i + d;
if output < self.parameters.output_min {
output = self.parameters.output_min;
}
if output > self.parameters.output_max {
output = self.parameters.output_max;
}
output
}
pub fn set_target(&mut self, target: f32) {
self.target = target;
}
#[allow(dead_code)]
pub fn reset(&mut self) {
self.integral = 0.0;
self.last_input = None;
}
}