forked from M-Labs/thermostat
Limit i_set within range of MAX1968 chip
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@ -25,6 +25,10 @@ use crate::{
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pub const CHANNELS: usize = 2;
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pub const CHANNELS: usize = 2;
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pub const R_SENSE: f64 = 0.05;
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pub const R_SENSE: f64 = 0.05;
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// as stated in the MAX1968 datasheet
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pub const MAX_TEC_I: f64 = 3.0;
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// DAC chip outputs 0-5v, which is then passed through a resistor dividor to provide 0-3v range
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// DAC chip outputs 0-5v, which is then passed through a resistor dividor to provide 0-3v range
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const DAC_OUT_V_MAX: f64 = 3.0;
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const DAC_OUT_V_MAX: f64 = 3.0;
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@ -130,6 +134,11 @@ impl<'a> Channels<'a> {
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}
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}
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pub fn set_i(&mut self, channel: usize, i_set: ElectricCurrent) -> ElectricCurrent {
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pub fn set_i(&mut self, channel: usize, i_set: ElectricCurrent) -> ElectricCurrent {
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// Silently clamp i_set
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let i_ceiling = ElectricCurrent::new::<ampere>(MAX_TEC_I);
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let i_floor = ElectricCurrent::new::<ampere>(-MAX_TEC_I);
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let i_set = i_set.min(i_ceiling).max(i_floor);
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let vref_meas = match channel.into() {
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let vref_meas = match channel.into() {
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0 => self.channel0.vref_meas,
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0 => self.channel0.vref_meas,
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1 => self.channel1.vref_meas,
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1 => self.channel1.vref_meas,
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@ -11,13 +11,11 @@ use uom::si::{
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use crate::{
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use crate::{
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hw_rev::HWSettings,
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hw_rev::HWSettings,
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command_handler::JsonBuffer,
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command_handler::JsonBuffer,
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channels::MAX_TEC_I,
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};
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};
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pub type FanPin = PwmChannels<TIM8, pwm::C4>;
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pub type FanPin = PwmChannels<TIM8, pwm::C4>;
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// as stated in the schematics
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const MAX_TEC_I: f32 = 3.0;
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const MAX_USER_FAN_PWM: f32 = 100.0;
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const MAX_USER_FAN_PWM: f32 = 100.0;
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const MIN_USER_FAN_PWM: f32 = 1.0;
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const MIN_USER_FAN_PWM: f32 = 1.0;
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@ -56,7 +54,7 @@ impl FanCtrl {
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pub fn cycle(&mut self, abs_max_tec_i: ElectricCurrent) {
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pub fn cycle(&mut self, abs_max_tec_i: ElectricCurrent) {
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self.abs_max_tec_i = abs_max_tec_i.get::<ampere>() as f32;
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self.abs_max_tec_i = abs_max_tec_i.get::<ampere>() as f32;
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if self.fan_auto && self.hw_settings.fan_available {
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if self.fan_auto && self.hw_settings.fan_available {
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let scaled_current = self.abs_max_tec_i / MAX_TEC_I;
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let scaled_current = self.abs_max_tec_i / MAX_TEC_I as f32;
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// do not limit upper bound, as it will be limited in the set_pwm()
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// do not limit upper bound, as it will be limited in the set_pwm()
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let pwm = (MAX_USER_FAN_PWM * (scaled_current * (scaled_current * self.k_a + self.k_b) + self.k_c)) as u32;
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let pwm = (MAX_USER_FAN_PWM * (scaled_current * (scaled_current * self.k_a + self.k_b) + self.k_c)) as u32;
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self.set_pwm(pwm);
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self.set_pwm(pwm);
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