thermostat/src/channel_state.rs

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use smoltcp::time::Instant;
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use crate::{
ad7172,
pid,
steinhart_hart as sh,
units::Volts,
};
pub struct ChannelState {
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pub adc_data: Option<u32>,
pub adc_time: Instant,
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pub dac_value: Volts,
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pub pid_engaged: bool,
pub pid: pid::Controller,
pub sh: sh::Parameters,
}
impl Default for ChannelState {
fn default() -> Self {
ChannelState {
adc_data: None,
adc_time: Instant::from_secs(0),
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dac_value: Volts(0.0),
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pid_engaged: false,
pid: pid::Controller::new(pid::Parameters::default()),
sh: sh::Parameters::default(),
}
}
}
impl ChannelState {
/// Update PID state on ADC input, calculate new DAC output
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pub fn update_pid(&mut self, now: Instant, adc_data: u32) -> f64 {
self.adc_data = Some(adc_data);
self.adc_time = now;
// Update PID controller
let input = (adc_data as f64) / (ad7172::MAX_VALUE as f64);
let temperature = self.sh.get_temperature(input);
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self.pid.update(temperature)
}
}