426 lines
15 KiB
Rust
426 lines
15 KiB
Rust
use core::f64::NAN;
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use core::marker::PhantomData;
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use crate::sys_timer;
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use crate::thermostat::ad5680;
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use crate::thermostat::max1968::{MAX1968, AdcReadTarget, PwmPinsEnum};
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use crate::thermostat::ad7172;
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use crate::thermostat::pid_state::{PidState, PidSettings, Parameters as PidParams};
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use crate::thermostat::temp_mon::{TempMon, TempStatus, TempMonSettings};
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use serde::{Deserialize, Serialize};
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use log::debug;
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use uom::si::{
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electric_current::ampere,
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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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f64::{ThermodynamicTemperature, ElectricCurrent, ElectricPotential, ElectricalResistance},
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ratio::ratio,
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};
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use miniconf::Tree;
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use super::pid_state;
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pub const R_SENSE: ElectricalResistance = ElectricalResistance {
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dimension: PhantomData,
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units: PhantomData,
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value: 0.05,
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};
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#[derive(Deserialize, Serialize, Clone, Copy, Debug, Tree)]
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pub struct TecSettings {
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pub center_pt: ElectricPotential,
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pub max_v_set: ElectricPotential,
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pub max_i_pos_set: ElectricCurrent,
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pub max_i_neg_set: ElectricCurrent,
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pub i_set: ElectricCurrent,
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}
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impl TecSettings{
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pub const DAC_OUT_V_MAX: ElectricPotential = ElectricPotential {
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dimension: PhantomData,
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units: PhantomData,
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value: 3.0,
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};
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pub const TEC_VSEC_BIAS_V: ElectricPotential = ElectricPotential {
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dimension: PhantomData,
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units: PhantomData,
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value: 1.65,
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};
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// Kirdy Design Specs:
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// MaxV = 5.0V
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// MAX Current = +- 1.0A
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const MAX_I_SET : ElectricCurrent = ElectricCurrent {
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dimension: PhantomData,
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units: PhantomData,
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value: 1.0,
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};
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const MAX_V_DUTY_TO_CURRENT_RATE: ElectricPotential = ElectricPotential {
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dimension: PhantomData,
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units: PhantomData,
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value: 4.0 * 3.3,
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};
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pub const MAX_V_MAX: ElectricPotential = ElectricPotential {
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dimension: PhantomData,
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units: PhantomData,
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value: 5.0,
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};
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const MAX_V_DUTY_MAX: f64 = TecSettings::MAX_V_MAX.value / TecSettings::MAX_V_DUTY_TO_CURRENT_RATE.value;
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const MAX_I_POS_NEG_DUTY_TO_CURRENT_RATE: ElectricCurrent = ElectricCurrent {
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dimension: PhantomData,
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units: PhantomData,
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value: 1.0 / (10.0 * R_SENSE.value / 3.3),
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};
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pub const MAX_I_POS_CURRENT: ElectricCurrent = ElectricCurrent {
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dimension: PhantomData,
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units: PhantomData,
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value: 1.0,
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};
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pub const MAX_I_NEG_CURRENT: ElectricCurrent = ElectricCurrent {
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dimension: PhantomData,
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units: PhantomData,
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value: 1.0,
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};
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// .get::<ratio>() is not implemented for const
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const MAX_I_POS_DUTY_MAX: f64 = TecSettings::MAX_I_POS_CURRENT.value / TecSettings::MAX_I_POS_NEG_DUTY_TO_CURRENT_RATE.value;
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const MAX_I_NEG_DUTY_MAX: f64 = TecSettings::MAX_I_NEG_CURRENT.value / TecSettings::MAX_I_POS_NEG_DUTY_TO_CURRENT_RATE.value;
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}
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impl Default for TecSettings {
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fn default() -> Self {
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Self {
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center_pt: ElectricPotential::new::<volt>(1.5),
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max_v_set: ElectricPotential::new::<volt>(5.0),
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max_i_pos_set: ElectricCurrent::new::<ampere>(1.0),
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max_i_neg_set: ElectricCurrent::new::<ampere>(1.0),
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i_set: ElectricCurrent::new::<ampere>(0.0),
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}
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}
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}
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pub struct Thermostat {
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max1968: MAX1968,
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ad7172: ad7172::AdcPhy,
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pub tec_settings: TecSettings,
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pid_ctrl_ch0: PidState,
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temp_mon: TempMon,
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}
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#[derive(Deserialize, Serialize, Copy, Clone, Debug, Tree)]
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pub struct ThermostatSettingsSummary {
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tec_settings: TecSettingSummary,
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pid_params: PidParams,
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temp_mon_settings: TempMonSettings,
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thermistor_params: ThermistorParams,
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}
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impl Thermostat{
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pub fn new (max1968: MAX1968, ad7172: ad7172::AdcPhy) -> Self {
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Thermostat{
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max1968: max1968,
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ad7172: ad7172,
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tec_settings: TecSettings::default(),
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pid_ctrl_ch0: PidState::default(),
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temp_mon: TempMon::default(),
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}
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}
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pub fn setup(&mut self){
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self.tec_setup();
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let t_adc_ch0_cal = self.t_adc_setup();
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self.pid_ctrl_ch0.set_adc_calibration(t_adc_ch0_cal) ;
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}
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fn tec_setup(&mut self) {
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self.power_down();
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self.tec_settings = TecSettings::default();
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self.set_i(self.tec_settings.i_set);
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self.set_max_v(self.tec_settings.max_v_set);
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self.set_max_i_pos(self.tec_settings.max_i_pos_set);
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self.set_max_i_neg(self.tec_settings.max_i_neg_set);
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}
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fn t_adc_setup(&mut self)->ad7172::ChannelCalibration{
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self.ad7172.set_sync_enable(false).unwrap();
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self.ad7172.setup_channel(0, ad7172::Input::Ain0, ad7172::Input::Ain1).unwrap();
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let adc_calibration0 = self.ad7172.get_calibration(0)
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.expect("adc_calibration0");
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self.ad7172.start_continuous_conversion().unwrap();
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adc_calibration0
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}
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pub fn poll_adc(&mut self) -> bool {
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let mut data_rdy = false;
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self.ad7172.data_ready().unwrap().map(|_ch| {
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let data = self.ad7172.read_data().unwrap();
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let state: &mut PidState = &mut self.pid_ctrl_ch0;
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state.update(data);
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let pid_engaged = state.get_pid_engaged();
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let temp = self.get_temperature();
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self.temp_mon.update_status(pid_engaged, temp);
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debug!("state.get_pid_engaged(): {:?}", pid_engaged);
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debug!("Temperature: {:?} degree", temp.get::<degree_celsius>());
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data_rdy = true;
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});
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data_rdy
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}
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pub fn update_pid(&mut self) {
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let state: &mut PidState = &mut self.pid_ctrl_ch0;
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let pid_engaged = state.get_pid_engaged();
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if pid_engaged {
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match state.update_pid() {
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Some(pid_output) => {
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self.set_i(ElectricCurrent::new::<ampere>(pid_output));
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debug!("Temperature Set Point: {:?} degree", self.pid_ctrl_ch0.get_pid_setpoint().get::<degree_celsius>());
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}
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None => { }
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}
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}
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}
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pub fn get_temp_mon_status(&mut self) -> TempStatus {
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self.temp_mon.get_status()
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}
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pub fn power_up(&mut self){
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self.max1968.power_up();
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}
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pub fn power_down(&mut self){
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self.max1968.power_down();
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self.pid_ctrl_ch0.reset_pid_state();
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self.set_i(ElectricCurrent::new::<ampere>(0.0));
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}
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fn set_center_pt(&mut self, value: ElectricPotential){
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self.tec_settings.center_pt = value;
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}
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pub fn set_i(&mut self, i_tec: ElectricCurrent) -> ElectricCurrent {
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let voltage = i_tec * 10.0 * R_SENSE + self.tec_settings.center_pt;
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let voltage = self.max1968.set_dac(voltage, TecSettings::DAC_OUT_V_MAX);
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self.tec_settings.i_set = (voltage - self.tec_settings.center_pt) / (10.0 * R_SENSE);
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self.tec_settings.i_set
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}
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pub fn set_max_v(&mut self, max_v: ElectricPotential) -> ElectricPotential {
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let duty = (max_v / TecSettings::MAX_V_DUTY_TO_CURRENT_RATE).get::<ratio>();
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let duty = self.max1968.set_pwm(PwmPinsEnum::MaxV, duty, TecSettings::MAX_V_DUTY_MAX);
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self.tec_settings.max_v_set = duty * TecSettings::MAX_V_DUTY_TO_CURRENT_RATE;
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self.tec_settings.max_v_set
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}
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pub fn set_max_i_pos(&mut self, max_i_pos: ElectricCurrent) -> ElectricCurrent {
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let duty = (max_i_pos / TecSettings::MAX_I_POS_NEG_DUTY_TO_CURRENT_RATE).get::<ratio>();
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let duty = self.max1968.set_pwm(PwmPinsEnum::MaxPosI, duty, TecSettings::MAX_I_POS_DUTY_MAX);
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self.tec_settings.max_i_pos_set = duty * TecSettings::MAX_I_POS_NEG_DUTY_TO_CURRENT_RATE;
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self.tec_settings.max_i_pos_set
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}
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pub fn set_max_i_neg(&mut self, max_i_neg: ElectricCurrent) -> ElectricCurrent {
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let duty = (max_i_neg / TecSettings::MAX_I_POS_NEG_DUTY_TO_CURRENT_RATE).get::<ratio>();
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let duty = self.max1968.set_pwm(PwmPinsEnum::MaxNegI, duty, TecSettings::MAX_I_NEG_DUTY_MAX);
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self.tec_settings.max_i_neg_set = duty * TecSettings::MAX_I_POS_NEG_DUTY_TO_CURRENT_RATE;
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self.tec_settings.max_i_neg_set
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}
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pub fn get_dac_vfb(&mut self) -> ElectricPotential {
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self.max1968.adc_read(AdcReadTarget::DacVfb, 16)
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}
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pub fn get_vref(&mut self) -> ElectricPotential {
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self.max1968.adc_read(AdcReadTarget::VREF, 16)
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}
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pub fn get_tec_i(&mut self) -> ElectricCurrent {
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let vref = self.get_vref();
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(self.max1968.adc_read(AdcReadTarget::ITec, 16) - vref) / ElectricalResistance::new::<ohm>(0.4)
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}
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pub fn get_tec_v(&mut self) -> ElectricPotential {
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(self.max1968.adc_read(AdcReadTarget::VTec, 16) - TecSettings::TEC_VSEC_BIAS_V) * 4.0
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}
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/// Calibrates the DAC output to match vref of the MAX driver to reduce zero-current offset of the MAX driver output.
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///
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/// The thermostat DAC applies a control voltage signal to the CTLI pin of MAX driver chip to control its output current.
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/// The CTLI input signal is centered around VREF of the MAX chip. Applying VREF to CTLI sets the output current to 0.
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///
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/// This calibration routine measures the VREF voltage and the DAC output with the STM32 ADC, and uses a breadth-first
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/// search to find the DAC setting that will produce a DAC output voltage closest to VREF. This DAC output voltage will
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/// be stored and used in subsequent i_set routines to bias the current control signal to the measured VREF, reducing
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/// the offset error of the current control signal.
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///
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/// The input offset of the STM32 ADC is eliminated by using the same ADC for the measurements, and by only using the
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/// difference in VREF and DAC output for the calibration.
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///
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/// This routine should be called only once after boot, repeated reading of the vref signal and changing of the stored
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/// VREF measurement can introduce significant noise at the current output, degrading the stabilily performance of the
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/// thermostat.
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pub fn calibrate_dac_value(&mut self) {
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const STEPS: i32 = 18;
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let target_voltage = self.max1968.adc_read(AdcReadTarget::VREF, 64);
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let mut start_value = 1;
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let mut best_error = ElectricPotential::new::<volt>(100.0);
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for step in (0..STEPS).rev() {
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debug!("TEC VREF Calibrating: Step {}/{}", step, STEPS);
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let mut prev_value = start_value;
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for value in (start_value..=ad5680::MAX_VALUE).step_by(1 << step) {
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self.max1968.phy.dac.set(value).unwrap();
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sys_timer::sleep(5);
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let dac_feedback = self.max1968.adc_read(AdcReadTarget::DacVfb, 64);
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let error = target_voltage - dac_feedback;
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if error < ElectricPotential::new::<volt>(0.0) {
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break;
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} else if error < best_error {
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best_error = error;
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start_value = prev_value;
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let vref = (value as f64 / ad5680::MAX_VALUE as f64) * TecSettings::DAC_OUT_V_MAX;
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self.set_center_pt(vref);
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}
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prev_value = value;
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}
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}
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}
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pub fn set_pid_engaged(&mut self, val: bool) {
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self.pid_ctrl_ch0.set_pid_engaged(val);
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}
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fn get_pid_engaged(&mut self) -> bool {
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self.pid_ctrl_ch0.get_pid_engaged()
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}
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pub fn get_status_report(&mut self) -> StatusReport {
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StatusReport {
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pid_engaged: self.get_pid_engaged(),
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temp_mon_status: self.temp_mon.get_status(),
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temperature: self.pid_ctrl_ch0.get_temperature(),
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i_set: self.tec_settings.i_set,
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tec_i: self.get_tec_i(),
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tec_v: self.get_tec_v(),
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tec_vref: self.get_vref(),
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}
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}
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pub fn get_temperature(&mut self) -> ThermodynamicTemperature {
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match self.pid_ctrl_ch0.get_temperature() {
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Some(val) => {
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val
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}
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None => { ThermodynamicTemperature::new::<degree_celsius>(NAN) }
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}
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}
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fn get_pid_settings(&mut self) -> pid_state::Parameters {
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self.pid_ctrl_ch0.get_pid_settings()
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}
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fn get_steinhart_hart(&mut self) -> ThermistorParams {
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let sh = self.pid_ctrl_ch0.get_sh();
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ThermistorParams {
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t0: sh.t0.get::<degree_celsius>(),
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r0: sh.r0,
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b: sh.b,
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}
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}
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fn get_tec_settings(&mut self) -> TecSettingSummary {
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TecSettingSummary {
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i_set: TecSettingsSummaryField { value: self.tec_settings.i_set, max: TecSettings::MAX_I_SET },
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max_v: TecSettingsSummaryField { value: self.tec_settings.max_v_set, max: TecSettings::MAX_V_MAX },
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max_i_pos: TecSettingsSummaryField { value: self.tec_settings.max_i_pos_set, max: TecSettings::MAX_I_POS_CURRENT },
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max_i_neg: TecSettingsSummaryField { value: self.tec_settings.max_i_neg_set, max: TecSettings::MAX_I_NEG_CURRENT },
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}
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}
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pub fn get_calibrated_vdda(&mut self) -> u32 {
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self.max1968.get_calibrated_vdda()
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}
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pub fn set_pid(&mut self, param: PidSettings, val: f64){
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self.pid_ctrl_ch0.set_pid_params(param, val);
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}
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pub fn set_sh_beta(&mut self, beta: f64) {
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self.pid_ctrl_ch0.set_sh_beta(beta);
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}
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pub fn set_sh_r0(&mut self, r0: ElectricalResistance) {
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self.pid_ctrl_ch0.set_sh_r0(r0);
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}
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pub fn set_sh_t0(&mut self, t0: ThermodynamicTemperature) {
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self.pid_ctrl_ch0.set_sh_t0(t0);
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}
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pub fn set_temperature_setpoint(&mut self, t: ThermodynamicTemperature) {
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let t = t.min(self.temp_mon.get_upper_limit()).max(self.temp_mon.get_lower_limit());
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self.pid_ctrl_ch0.set_pid_setpoint(t);
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self.temp_mon.set_setpoint(t);
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}
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pub fn set_temp_mon_upper_limit(&mut self, t: ThermodynamicTemperature) {
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self.temp_mon.set_upper_limit(t);
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}
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pub fn set_temp_mon_lower_limit(&mut self, t: ThermodynamicTemperature) {
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self.temp_mon.set_lower_limit(t);
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}
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pub fn clear_temp_mon_alarm(&mut self) {
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self.temp_mon.clear_alarm();
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}
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fn get_temp_mon_settings(&mut self) -> TempMonSettings {
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self.temp_mon.get_settings()
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}
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pub fn get_settings_summary(&mut self) -> ThermostatSettingsSummary {
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ThermostatSettingsSummary {
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tec_settings: self.get_tec_settings(),
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pid_params: self.get_pid_settings(),
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temp_mon_settings: self.get_temp_mon_settings(),
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thermistor_params: self.get_steinhart_hart(),
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}
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}
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}
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#[derive(Deserialize, Serialize, Copy, Clone, Debug, Tree)]
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pub struct StatusReport {
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pid_engaged: bool,
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temp_mon_status: TempStatus,
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temperature: Option<ThermodynamicTemperature>,
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i_set: ElectricCurrent,
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tec_i: ElectricCurrent,
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tec_v: ElectricPotential,
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tec_vref: ElectricPotential,
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}
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#[derive(Deserialize, Serialize, Copy, Clone, Debug, Tree)]
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pub struct TecSettingsSummaryField<T> {
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value: T,
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max: T,
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}
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#[derive(Deserialize, Serialize, Copy, Clone, Debug, Tree)]
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pub struct TecSettingSummary {
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i_set: TecSettingsSummaryField<ElectricCurrent>,
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max_v: TecSettingsSummaryField<ElectricPotential>,
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max_i_pos: TecSettingsSummaryField<ElectricCurrent>,
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max_i_neg: TecSettingsSummaryField<ElectricCurrent>,
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}
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#[derive(Deserialize, Serialize, Clone, Copy, Debug, Tree)]
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pub struct ThermistorParams {
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t0: f64,
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r0: ElectricalResistance,
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b: f64
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}
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