Add averaging filter on the pin_adc readings
- Adapted from Kirdy Firmware - Can reduce the i_tec readings noise dispersion
This commit is contained in:
parent
9fce19a418
commit
1fcfe41a63
202
src/channels.rs
202
src/channels.rs
@ -22,6 +22,13 @@ use crate::{
|
||||
steinhart_hart,
|
||||
};
|
||||
|
||||
pub enum PinsAdcReadTarget {
|
||||
VREF,
|
||||
DacVfb,
|
||||
ITec,
|
||||
VTec,
|
||||
}
|
||||
|
||||
pub const CHANNELS: usize = 2;
|
||||
pub const R_SENSE: f64 = 0.05;
|
||||
|
||||
@ -102,7 +109,7 @@ impl Channels {
|
||||
pub fn get_center(&mut self, channel: usize) -> ElectricPotential {
|
||||
match self.channel_state(channel).center {
|
||||
CenterPoint::Vref =>
|
||||
self.read_vref(channel),
|
||||
self.adc_read(channel, PinsAdcReadTarget::VREF, 8),
|
||||
CenterPoint::Override(center_point) =>
|
||||
ElectricPotential::new::<volt>(center_point.into()),
|
||||
}
|
||||
@ -151,32 +158,112 @@ impl Channels {
|
||||
i_set
|
||||
}
|
||||
|
||||
pub fn read_dac_feedback(&mut self, channel: usize) -> ElectricPotential {
|
||||
/// AN4073: ADC Reading Dispersion can be reduced through Averaging
|
||||
pub fn adc_read(&mut self, channel: usize, adc_read_target: PinsAdcReadTarget, avg_pt: u16) -> ElectricPotential {
|
||||
let mut sample: u32 = 0;
|
||||
match channel {
|
||||
0 => {
|
||||
let sample = self.pins_adc.convert(
|
||||
&self.channel0.dac_feedback_pin,
|
||||
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
|
||||
);
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample);
|
||||
sample = match adc_read_target {
|
||||
PinsAdcReadTarget::VREF => {
|
||||
match &self.channel0.vref_pin {
|
||||
Channel0VRef::Analog(vref_pin) => {
|
||||
for _ in (0..avg_pt).rev() {
|
||||
sample += self
|
||||
.pins_adc
|
||||
.convert(vref_pin, stm32f4xx_hal::adc::config::SampleTime::Cycles_480)
|
||||
as u32;
|
||||
}
|
||||
sample / avg_pt as u32
|
||||
},
|
||||
Channel0VRef::Disabled(_) => {2048 as u32}
|
||||
}
|
||||
}
|
||||
PinsAdcReadTarget::DacVfb => {
|
||||
for _ in (0..avg_pt).rev() {
|
||||
sample += self
|
||||
.pins_adc
|
||||
.convert(&self.channel0.dac_feedback_pin,stm32f4xx_hal::adc::config::SampleTime::Cycles_480)
|
||||
as u32;
|
||||
}
|
||||
sample / avg_pt as u32
|
||||
}
|
||||
PinsAdcReadTarget::ITec => {
|
||||
for _ in (0..avg_pt).rev() {
|
||||
sample += self
|
||||
.pins_adc
|
||||
.convert(&self.channel0.itec_pin, stm32f4xx_hal::adc::config::SampleTime::Cycles_480)
|
||||
as u32;
|
||||
}
|
||||
sample / avg_pt as u32
|
||||
}
|
||||
PinsAdcReadTarget::VTec => {
|
||||
for _ in (0..avg_pt).rev() {
|
||||
sample += self
|
||||
.pins_adc
|
||||
.convert(&self.channel0.tec_u_meas_pin, stm32f4xx_hal::adc::config::SampleTime::Cycles_480)
|
||||
as u32;
|
||||
}
|
||||
sample / avg_pt as u32
|
||||
}
|
||||
};
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample as u16);
|
||||
ElectricPotential::new::<millivolt>(mv as f64)
|
||||
}
|
||||
1 => {
|
||||
let sample = self.pins_adc.convert(
|
||||
&self.channel1.dac_feedback_pin,
|
||||
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
|
||||
);
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample);
|
||||
sample = match adc_read_target {
|
||||
PinsAdcReadTarget::VREF => {
|
||||
match &self.channel1.vref_pin {
|
||||
Channel1VRef::Analog(vref_pin) => {
|
||||
for _ in (0..avg_pt).rev() {
|
||||
sample += self
|
||||
.pins_adc
|
||||
.convert(vref_pin, stm32f4xx_hal::adc::config::SampleTime::Cycles_480)
|
||||
as u32;
|
||||
}
|
||||
sample / avg_pt as u32
|
||||
},
|
||||
Channel1VRef::Disabled(_) => {2048 as u32}
|
||||
}
|
||||
}
|
||||
PinsAdcReadTarget::DacVfb => {
|
||||
for _ in (0..avg_pt).rev() {
|
||||
sample += self
|
||||
.pins_adc
|
||||
.convert(&self.channel1.dac_feedback_pin, stm32f4xx_hal::adc::config::SampleTime::Cycles_480)
|
||||
as u32;
|
||||
}
|
||||
sample / avg_pt as u32
|
||||
}
|
||||
PinsAdcReadTarget::ITec => {
|
||||
for _ in (0..avg_pt).rev() {
|
||||
sample += self
|
||||
.pins_adc
|
||||
.convert(&self.channel1.itec_pin, stm32f4xx_hal::adc::config::SampleTime::Cycles_480)
|
||||
as u32;
|
||||
}
|
||||
sample / avg_pt as u32
|
||||
}
|
||||
PinsAdcReadTarget::VTec => {
|
||||
for _ in (0..avg_pt).rev() {
|
||||
sample += self
|
||||
.pins_adc
|
||||
.convert(&self.channel1.tec_u_meas_pin, stm32f4xx_hal::adc::config::SampleTime::Cycles_480)
|
||||
as u32;
|
||||
}
|
||||
sample / avg_pt as u32
|
||||
}
|
||||
};
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample as u16);
|
||||
ElectricPotential::new::<millivolt>(mv as f64)
|
||||
}
|
||||
_ => unreachable!(),
|
||||
_ => unreachable!()
|
||||
}
|
||||
}
|
||||
|
||||
pub fn read_dac_feedback_until_stable(&mut self, channel: usize, tolerance: ElectricPotential) -> ElectricPotential {
|
||||
let mut prev = self.read_dac_feedback(channel);
|
||||
let mut prev = self.adc_read(channel, PinsAdcReadTarget::DacVfb, 1);
|
||||
loop {
|
||||
let current = self.read_dac_feedback(channel);
|
||||
let current = self.adc_read(channel, PinsAdcReadTarget::DacVfb, 1);
|
||||
if (current - prev).abs() < tolerance {
|
||||
return current;
|
||||
}
|
||||
@ -184,83 +271,6 @@ impl Channels {
|
||||
}
|
||||
}
|
||||
|
||||
pub fn read_itec(&mut self, channel: usize) -> ElectricPotential {
|
||||
match channel {
|
||||
0 => {
|
||||
let sample = self.pins_adc.convert(
|
||||
&self.channel0.itec_pin,
|
||||
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
|
||||
);
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample);
|
||||
ElectricPotential::new::<millivolt>(mv as f64)
|
||||
}
|
||||
1 => {
|
||||
let sample = self.pins_adc.convert(
|
||||
&self.channel1.itec_pin,
|
||||
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
|
||||
);
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample);
|
||||
ElectricPotential::new::<millivolt>(mv as f64)
|
||||
}
|
||||
_ => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
/// should be 1.5V
|
||||
pub fn read_vref(&mut self, channel: usize) -> ElectricPotential {
|
||||
match channel {
|
||||
0 => {
|
||||
match &self.channel0.vref_pin {
|
||||
Channel0VRef::Analog(vref_pin) => {
|
||||
let sample = self.pins_adc.convert(
|
||||
vref_pin,
|
||||
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
|
||||
);
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample);
|
||||
ElectricPotential::new::<millivolt>(mv as f64)
|
||||
},
|
||||
Channel0VRef::Disabled(_) => ElectricPotential::new::<volt>(1.5)
|
||||
}
|
||||
}
|
||||
1 => {
|
||||
match &self.channel1.vref_pin {
|
||||
Channel1VRef::Analog(vref_pin) => {
|
||||
let sample = self.pins_adc.convert(
|
||||
vref_pin,
|
||||
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
|
||||
);
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample);
|
||||
ElectricPotential::new::<millivolt>(mv as f64)
|
||||
},
|
||||
Channel1VRef::Disabled(_) => ElectricPotential::new::<volt>(1.5)
|
||||
}
|
||||
}
|
||||
_ => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn read_tec_u_meas(&mut self, channel: usize) -> ElectricPotential {
|
||||
match channel {
|
||||
0 => {
|
||||
let sample = self.pins_adc.convert(
|
||||
&self.channel0.tec_u_meas_pin,
|
||||
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
|
||||
);
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample);
|
||||
ElectricPotential::new::<millivolt>(mv as f64)
|
||||
}
|
||||
1 => {
|
||||
let sample = self.pins_adc.convert(
|
||||
&self.channel1.tec_u_meas_pin,
|
||||
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
|
||||
);
|
||||
let mv = self.pins_adc.sample_to_millivolts(sample);
|
||||
ElectricPotential::new::<millivolt>(mv as f64)
|
||||
}
|
||||
_ => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
/// Calibrates the DAC output to match vref of the MAX driver to reduce zero-current offset of the MAX driver output.
|
||||
///
|
||||
/// The thermostat DAC applies a control voltage signal to the CTLI pin of MAX driver chip to control its output current.
|
||||
@ -388,12 +398,12 @@ impl Channels {
|
||||
|
||||
// Get current passing through TEC
|
||||
pub fn get_tec_i(&mut self, channel: usize) -> ElectricCurrent {
|
||||
(self.read_itec(channel) - self.read_vref(channel)) / ElectricalResistance::new::<ohm>(0.4)
|
||||
(self.adc_read(channel, PinsAdcReadTarget::ITec, 16) - self.adc_read(channel, PinsAdcReadTarget::VREF, 16)) / ElectricalResistance::new::<ohm>(0.4)
|
||||
}
|
||||
|
||||
// Get voltage across TEC
|
||||
pub fn get_tec_v(&mut self, channel: usize) -> ElectricPotential {
|
||||
(self.read_tec_u_meas(channel) - ElectricPotential::new::<volt>(1.5)) * 4.0
|
||||
(self.adc_read(channel, PinsAdcReadTarget::VTec, 16) - ElectricPotential::new::<volt>(1.5)) * 4.0
|
||||
}
|
||||
|
||||
fn set_pwm(&mut self, channel: usize, pin: PwmPin, duty: f64) -> f64 {
|
||||
@ -446,7 +456,7 @@ impl Channels {
|
||||
|
||||
fn report(&mut self, channel: usize) -> Report {
|
||||
let i_set = self.get_i(channel);
|
||||
let i_tec = self.read_itec(channel);
|
||||
let i_tec = self.adc_read(channel, PinsAdcReadTarget::ITec, 16);
|
||||
let tec_i = self.get_tec_i(channel);
|
||||
let dac_value = self.get_dac(channel);
|
||||
let state = self.channel_state(channel);
|
||||
@ -462,7 +472,7 @@ impl Channels {
|
||||
pid_engaged: state.pid_engaged,
|
||||
i_set,
|
||||
dac_value,
|
||||
dac_feedback: self.read_dac_feedback(channel),
|
||||
dac_feedback: self.adc_read(channel, PinsAdcReadTarget::DacVfb, 1),
|
||||
i_tec,
|
||||
tec_i,
|
||||
tec_u_meas: self.get_tec_v(channel),
|
||||
|
||||
Loading…
Reference in New Issue
Block a user