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ionpak-thermostat
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pid: use Option instead of NaN

This commit is contained in:
Sebastien Bourdeauducq 2017-05-06 20:43:33 +08:00
parent a39c95e276
commit 0cb8d0c53d
2 changed files with 8 additions and 12 deletions
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2
firmware/src/main.rs
View File

@ -1,4 +1,4 @@
#![feature(used, const_fn, core_float)]
#![feature(used, const_fn)]
#![no_std]
#[macro_use]

18
firmware/src/pid.rs
View File

@ -1,6 +1,3 @@
use core::f32;
use core::num::Float;
#[derive(Clone, Copy)]
pub struct Parameters {
pub kp: f32,
@ -16,7 +13,7 @@ pub struct Controller {
parameters: Parameters,
target: f32,
integral: f32,
last_input: f32
last_input: Option<f32>
}
impl Controller {
@ -24,7 +21,7 @@ impl Controller {
Controller {
parameters: parameters,
target: 0.0,
last_input: f32::NAN,
last_input: None,
integral: 0.0
}
}
@ -43,12 +40,11 @@ impl Controller {
}
let i = self.parameters.ki * self.integral;
let d = if self.last_input.is_nan() {
0.0
} else {
self.parameters.kd * (self.last_input - input)
let d = match self.last_input {
None => 0.0,
Some(last_input) => self.parameters.kd * (last_input - input)
};
self.last_input = input;
self.last_input = Some(input);
let mut output = p + i + d;
if output < self.parameters.output_min {
@ -67,6 +63,6 @@ impl Controller {
#[allow(dead_code)]
pub fn reset(&mut self) {
self.integral = 0.0;
self.last_input = f32::NAN;
self.last_input = None;
}
}