103 lines
3.0 KiB
Rust
103 lines
3.0 KiB
Rust
use smoltcp::time::{Duration, Instant};
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use uom::si::{
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f64::{
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ElectricPotential,
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ElectricalResistance,
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ThermodynamicTemperature,
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Time,
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},
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electric_potential::volt,
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electrical_resistance::ohm,
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thermodynamic_temperature::degree_celsius,
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time::millisecond,
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};
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use crate::{
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ad7172,
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pid,
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steinhart_hart as sh,
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command_parser::CenterPoint,
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};
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const R_INNER: f64 = 2.0 * 5100.0;
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const VREF_SENS: f64 = 3.3 / 2.0;
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pub struct ChannelState {
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pub adc_data: Option<u32>,
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pub adc_calibration: ad7172::ChannelCalibration,
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pub adc_time: Instant,
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pub adc_interval: Duration,
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/// VREF for the TEC (1.5V)
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pub vref: ElectricPotential,
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/// i_set 0A center point
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pub center: CenterPoint,
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pub dac_value: ElectricPotential,
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pub pid_engaged: bool,
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pub pid: pid::Controller,
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pub sh: sh::Parameters,
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}
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impl ChannelState {
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pub fn new(adc_calibration: ad7172::ChannelCalibration) -> Self {
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ChannelState {
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adc_data: None,
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adc_calibration,
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adc_time: Instant::from_secs(0),
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// default: 10 Hz
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adc_interval: Duration::from_millis(100),
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// updated later with Channels.read_vref()
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vref: ElectricPotential::new::<volt>(1.5),
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center: CenterPoint::Vref,
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dac_value: ElectricPotential::new::<volt>(0.0),
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pid_engaged: false,
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pid: pid::Controller::new(pid::Parameters::default()),
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sh: sh::Parameters::default(),
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}
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}
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pub fn update(&mut self, now: Instant, adc_data: u32) {
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self.adc_data = if adc_data == ad7172::MAX_VALUE {
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// this means there is no thermistor plugged into the ADC.
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None
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} else {
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Some(adc_data)
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};
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self.adc_interval = now - self.adc_time;
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self.adc_time = now;
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}
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/// Update PID state on ADC input, calculate new DAC output
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pub fn update_pid(&mut self) -> Option<f64> {
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let temperature = self.get_temperature()?
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.get::<degree_celsius>();
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let pid_output = self.pid.update(temperature);
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Some(pid_output)
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}
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pub fn get_adc_time(&self) -> Time {
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Time::new::<millisecond>(self.adc_time.total_millis() as f64)
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}
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pub fn get_adc_interval(&self) -> Time {
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Time::new::<millisecond>(self.adc_interval.total_millis() as f64)
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}
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pub fn get_adc(&self) -> Option<ElectricPotential> {
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Some(self.adc_calibration.convert_data(self.adc_data?))
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}
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/// Get `SENS[01]` input resistance
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pub fn get_sens(&self) -> Option<ElectricalResistance> {
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let r_inner = ElectricalResistance::new::<ohm>(R_INNER);
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let vref = ElectricPotential::new::<volt>(VREF_SENS);
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let adc_input = self.get_adc()?;
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let r = r_inner * adc_input / (vref - adc_input);
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Some(r)
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}
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pub fn get_temperature(&self) -> Option<ThermodynamicTemperature> {
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let r = self.get_sens()?;
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let temperature = self.sh.get_temperature(r);
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Some(temperature)
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}
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}
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