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Add a command to reverse the output polarity

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Effectively flips all values related to the directionality of current
through the TEC, including current maximums. The reversed status is
stored in the flash store and will be loaded on reset once saved.

The command is "pwm <ch> polarity <normal/reversed>", where the "normal"
polarity is indicated by the front panel markings.

This is needed for IDC cable connections to the Sinara 5432 DAC
"Zotino", since the TEC pins of the 10-pin connector on the Thermostat
and Zotino have opposite polarities.

Polarity command
This commit is contained in:
atse 2024-08-20 17:42:44 +08:00
parent ad54842c43
commit e4d3aee622
6 changed files with 124 additions and 47 deletions
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73
README.md
View File

@ -92,40 +92,43 @@ ADC input data is provided in reports. Query for the latest report with the comm
Send commands as simple text string terminated by `\n`. Responses are Send commands as simple text string terminated by `\n`. Responses are
formatted as line-delimited JSON. formatted as line-delimited JSON.
| Syntax | Function | | Syntax | Function |
|----------------------------------|-------------------------------------------------------------------------------| |------------------------------------------- |-------------------------------------------------------------------------------|
| `report` | Show current input | | `report` | Show current input |
| `pwm` | Show current PWM settings | | `report mode` | Show current report mode |
| `pwm <0/1> max_i_pos <amp>` | Set maximum positive output current | | `report mode <off/on>` | Set report mode |
| `pwm <0/1> max_i_neg <amp>` | Set maximum negative output current | | `pwm` | Show current PWM settings |
| `pwm <0/1> max_v <volt>` | Set maximum output voltage | | `pwm <0/1> max_i_pos <amp>` | Set maximum positive output current |
| `pwm <0/1> i_set <amp>` | Disengage PID, set fixed output current | | `pwm <0/1> max_i_neg <amp>` | Set maximum negative output current |
| `pwm <0/1> pid` | Let output current to be controlled by the PID | | `pwm <0/1> max_v <volt>` | Set maximum output voltage |
| `center <0/1> <volt>` | Set the MAX1968 0A-centerpoint to the specified fixed voltage | | `pwm <0/1> i_set <amp>` | Disengage PID, set fixed output current |
| `center <0/1> vref` | Set the MAX1968 0A-centerpoint to measure from VREF | | `pwm <0/1> polarity <normal/reversed>` | Set output current polarity, with 'normal' being the front panel polarity |
| `pid` | Show PID configuration | | `pwm <0/1> pid` | Let output current to be controlled by the PID |
| `pid <0/1> target <deg_celsius>` | Set the PID controller target temperature | | `center <0/1> <volt>` | Set the MAX1968 0A-centerpoint to the specified fixed voltage |
| `pid <0/1> kp <value>` | Set proportional gain | | `center <0/1> vref` | Set the MAX1968 0A-centerpoint to measure from VREF |
| `pid <0/1> ki <value>` | Set integral gain | | `pid` | Show PID configuration |
| `pid <0/1> kd <value>` | Set differential gain | | `pid <0/1> target <deg_celsius>` | Set the PID controller target temperature |
| `pid <0/1> output_min <amp>` | Set mininum output | | `pid <0/1> kp <value>` | Set proportional gain |
| `pid <0/1> output_max <amp>` | Set maximum output | | `pid <0/1> ki <value>` | Set integral gain |
| `s-h` | Show Steinhart-Hart equation parameters | | `pid <0/1> kd <value>` | Set differential gain |
| `s-h <0/1> <t0/b/r0> <value>` | Set Steinhart-Hart parameter for a channel | | `pid <0/1> output_min <amp>` | Set mininum output |
| `postfilter` | Show postfilter settings | | `pid <0/1> output_max <amp>` | Set maximum output |
| `postfilter <0/1> off` | Disable postfilter | | `s-h` | Show Steinhart-Hart equation parameters |
| `postfilter <0/1> rate <rate>` | Set postfilter output data rate | | `s-h <0/1> <t0/b/r0> <value>` | Set Steinhart-Hart parameter for a channel |
| `load [0/1]` | Restore configuration for channel all/0/1 from flash | | `postfilter` | Show postfilter settings |
| `save [0/1]` | Save configuration for channel all/0/1 to flash | | `postfilter <0/1> off` | Disable postfilter |
| `reset` | Reset the device | | `postfilter <0/1> rate <rate>` | Set postfilter output data rate |
| `dfu` | Reset device and enters USB device firmware update (DFU) mode | | `load [0/1]` | Restore configuration for channel all/0/1 from flash |
| `ipv4 <X.X.X.X/L> [Y.Y.Y.Y]` | Configure IPv4 address, netmask length, and optional default gateway | | `save [0/1]` | Save configuration for channel all/0/1 to flash |
| `fan` | Show current fan settings and sensors' measurements | | `reset` | Reset the device |
| `fan <value>` | Set fan power with values from 1 to 100 | | `dfu` | Reset device and enters USB device firmware update (DFU) mode |
| `fan auto` | Enable automatic fan speed control | | `ipv4 <X.X.X.X/L> [Y.Y.Y.Y]` | Configure IPv4 address, netmask length, and optional default gateway |
| `fcurve <a> <b> <c>` | Set fan controller curve coefficients (see *Fan control* section) | | `fan` | Show current fan settings and sensors' measurements |
| `fcurve default` | Set fan controller curve coefficients to defaults (see *Fan control* section) | | `fan <value>` | Set fan power with values from 1 to 100 |
| `hwrev` | Show hardware revision, and settings related to it | | `fan auto` | Enable automatic fan speed control |
| `fcurve <a> <b> <c>` | Set fan controller curve coefficients (see *Fan control* section) |
| `fcurve default` | Set fan controller curve coefficients to defaults (see *Fan control* section) |
| `hwrev` | Show hardware revision, and settings related to it |
## USB ## USB
@ -182,6 +185,8 @@ postfilter rate can be tuned with the `postfilter` command.
When using a TEC module with the Thermostat, the Thermostat expects the thermal load (where the thermistor is located) to cool down with a positive software current set point, and heat up with a negative current set point. When using a TEC module with the Thermostat, the Thermostat expects the thermal load (where the thermistor is located) to cool down with a positive software current set point, and heat up with a negative current set point.
If the Thermostat is used for temperature control with the Sinara 5432 DAC "Zotino", and is connected via an IDC cable, the TEC polarity may need to be reversed with the `pwm <ch> polarity reversed` TCP command.
Testing heat flow direction with a low set current is recommended before installation of the TEC module. Testing heat flow direction with a low set current is recommended before installation of the TEC module.
### Limits ### Limits

4
src/channel_state.rs
View File

@ -17,7 +17,7 @@ use crate::{
ad7172, ad7172,
pid, pid,
steinhart_hart as sh, steinhart_hart as sh,
command_parser::CenterPoint, command_parser::{CenterPoint, Polarity},
}; };
const R_INNER: f64 = 2.0 * 5100.0; const R_INNER: f64 = 2.0 * 5100.0;
@ -35,6 +35,7 @@ pub struct ChannelState {
pub pid_engaged: bool, pub pid_engaged: bool,
pub pid: pid::Controller, pub pid: pid::Controller,
pub sh: sh::Parameters, pub sh: sh::Parameters,
pub polarity: Polarity,
} }
impl ChannelState { impl ChannelState {
@ -51,6 +52,7 @@ impl ChannelState {
pid_engaged: false, pid_engaged: false,
pid: pid::Controller::new(pid::Parameters::default()), pid: pid::Controller::new(pid::Parameters::default()),
sh: sh::Parameters::default(), sh: sh::Parameters::default(),
polarity: Polarity::Normal,
} }
} }

51
src/channels.rs
View File

@ -17,7 +17,7 @@ use crate::{
ad7172, ad7172,
channel::{Channel, Channel0, Channel1}, channel::{Channel, Channel0, Channel1},
channel_state::ChannelState, channel_state::ChannelState,
command_parser::{CenterPoint, PwmPin}, command_parser::{CenterPoint, PwmPin, Polarity},
command_handler::JsonBuffer, command_handler::JsonBuffer,
pins::{self, Channel0VRef, Channel1VRef}, pins::{self, Channel0VRef, Channel1VRef},
steinhart_hart, steinhart_hart,
@ -158,6 +158,11 @@ impl Channels {
pub fn set_i(&mut self, channel: usize, i_set: ElectricCurrent) -> ElectricCurrent { pub fn set_i(&mut self, channel: usize, i_set: ElectricCurrent) -> ElectricCurrent {
let i_set = i_set.min(MAX_TEC_I).max(-MAX_TEC_I); let i_set = i_set.min(MAX_TEC_I).max(-MAX_TEC_I);
self.channel_state(channel).i_set = i_set;
let negate = match self.channel_state(channel).polarity {
Polarity::Normal => 1.0,
Polarity::Reversed => -1.0,
};
let vref_meas = match channel.into() { let vref_meas = match channel.into() {
0 => self.channel0.vref_meas, 0 => self.channel0.vref_meas,
1 => self.channel1.vref_meas, 1 => self.channel1.vref_meas,
@ -165,10 +170,9 @@ impl Channels {
}; };
let center_point = vref_meas; let center_point = vref_meas;
let r_sense = ElectricalResistance::new::<ohm>(R_SENSE); let r_sense = ElectricalResistance::new::<ohm>(R_SENSE);
let voltage = i_set * 10.0 * r_sense + center_point; let voltage = negate * i_set * 10.0 * r_sense + center_point;
let voltage = self.set_dac(channel, voltage); let voltage = self.set_dac(channel, voltage);
let i_set = (voltage - center_point) / (10.0 * r_sense); let i_set = negate * (voltage - center_point) / (10.0 * r_sense);
self.channel_state(channel).i_set = i_set;
i_set i_set
} }
@ -386,18 +390,28 @@ impl Channels {
} }
pub fn get_max_i_pos(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) { pub fn get_max_i_pos(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) {
let duty = self.get_pwm(channel, PwmPin::MaxIPos); let duty = match self.channel_state(channel).polarity {
Polarity::Normal => self.get_pwm(channel, PwmPin::MaxIPos),
Polarity::Reversed => self.get_pwm(channel, PwmPin::MaxINeg),
};
(duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, MAX_TEC_I) (duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, MAX_TEC_I)
} }
pub fn get_max_i_neg(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) { pub fn get_max_i_neg(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) {
let duty = self.get_pwm(channel, PwmPin::MaxINeg); let duty = match self.channel_state(channel).polarity {
Polarity::Normal => self.get_pwm(channel, PwmPin::MaxINeg),
Polarity::Reversed => self.get_pwm(channel, PwmPin::MaxIPos),
};
(duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, MAX_TEC_I) (duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, MAX_TEC_I)
} }
// Get current passing through TEC // Get current passing through TEC
pub fn get_tec_i(&mut self, channel: usize) -> ElectricCurrent { pub fn get_tec_i(&mut self, channel: usize) -> ElectricCurrent {
(self.adc_read(channel, PinsAdcReadTarget::ITec, 16) - self.adc_read(channel, PinsAdcReadTarget::VREF, 16)) / ElectricalResistance::new::<ohm>(0.4) let tec_i = (self.adc_read(channel, PinsAdcReadTarget::ITec, 16) - self.adc_read(channel, PinsAdcReadTarget::VREF, 16)) / ElectricalResistance::new::<ohm>(0.4);
match self.channel_state(channel).polarity {
Polarity::Normal => tec_i,
Polarity::Reversed => -tec_i,
}
} }
// Get voltage across TEC // Get voltage across TEC
@ -442,17 +456,36 @@ impl Channels {
pub fn set_max_i_pos(&mut self, channel: usize, max_i_pos: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) { pub fn set_max_i_pos(&mut self, channel: usize, max_i_pos: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) {
let max = ElectricCurrent::new::<ampere>(3.0); let max = ElectricCurrent::new::<ampere>(3.0);
let duty = (max_i_pos.min(MAX_TEC_I).max(ElectricCurrent::zero()) / MAX_TEC_I_DUTY_TO_CURRENT_RATE).get::<ratio>(); let duty = (max_i_pos.min(MAX_TEC_I).max(ElectricCurrent::zero()) / MAX_TEC_I_DUTY_TO_CURRENT_RATE).get::<ratio>();
let duty = self.set_pwm(channel, PwmPin::MaxIPos, duty); let duty = match self.channel_state(channel).polarity {
Polarity::Normal => self.set_pwm(channel, PwmPin::MaxIPos, duty),
Polarity::Reversed => self.set_pwm(channel, PwmPin::MaxINeg, duty),
};
(duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, max) (duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, max)
} }
pub fn set_max_i_neg(&mut self, channel: usize, max_i_neg: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) { pub fn set_max_i_neg(&mut self, channel: usize, max_i_neg: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) {
let max = ElectricCurrent::new::<ampere>(3.0); let max = ElectricCurrent::new::<ampere>(3.0);
let duty = (max_i_neg.min(MAX_TEC_I).max(ElectricCurrent::zero()) / MAX_TEC_I_DUTY_TO_CURRENT_RATE).get::<ratio>(); let duty = (max_i_neg.min(MAX_TEC_I).max(ElectricCurrent::zero()) / MAX_TEC_I_DUTY_TO_CURRENT_RATE).get::<ratio>();
let duty = self.set_pwm(channel, PwmPin::MaxINeg, duty); let duty = match self.channel_state(channel).polarity {
Polarity::Normal => self.set_pwm(channel, PwmPin::MaxINeg, duty),
Polarity::Reversed => self.set_pwm(channel, PwmPin::MaxIPos, duty),
};
(duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, max) (duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, max)
} }
pub fn set_polarity(&mut self, channel: usize, polarity: Polarity) {
if self.channel_state(channel).polarity != polarity {
let i_set = self.channel_state(channel).i_set;
let max_i_pos = self.get_max_i_pos(channel).0;
let max_i_neg = self.get_max_i_neg(channel).0;
self.channel_state(channel).polarity = polarity;
self.set_i(channel, i_set);
self.set_max_i_pos(channel, max_i_pos);
self.set_max_i_neg(channel, max_i_neg);
}
}
fn report(&mut self, channel: usize) -> Report { fn report(&mut self, channel: usize) -> Report {
let i_set = self.get_i(channel); let i_set = self.get_i(channel);
let i_tec = self.adc_read(channel, PinsAdcReadTarget::ITec, 16); let i_tec = self.adc_read(channel, PinsAdcReadTarget::ITec, 16);

10
src/command_handler.rs
View File

@ -11,7 +11,8 @@ use super::{
CenterPoint, CenterPoint,
PidParameter, PidParameter,
PwmPin, PwmPin,
ShParameter ShParameter,
Polarity
}, },
ad7172, ad7172,
CHANNEL_CONFIG_KEY, CHANNEL_CONFIG_KEY,
@ -170,6 +171,12 @@ impl Handler {
Ok(Handler::Handled) Ok(Handler::Handled)
} }
fn set_polarity(socket: &mut TcpSocket, channels: &mut Channels, channel: usize, polarity: Polarity) -> Result<Handler, Error> {
channels.set_polarity(channel, polarity);
send_line(socket, b"{}");
Ok(Handler::Handled)
}
fn set_pwm (socket: &mut TcpSocket, channels: &mut Channels, channel: usize, pin: PwmPin, value: f64) -> Result<Handler, Error> { fn set_pwm (socket: &mut TcpSocket, channels: &mut Channels, channel: usize, pin: PwmPin, value: f64) -> Result<Handler, Error> {
match pin { match pin {
PwmPin::ISet => { PwmPin::ISet => {
@ -411,6 +418,7 @@ impl Handler {
Command::Show(ShowCommand::PostFilter) => Handler::show_post_filter(socket, channels), Command::Show(ShowCommand::PostFilter) => Handler::show_post_filter(socket, channels),
Command::Show(ShowCommand::Ipv4) => Handler::show_ipv4(socket, ipv4_config), Command::Show(ShowCommand::Ipv4) => Handler::show_ipv4(socket, ipv4_config),
Command::PwmPid { channel } => Handler::engage_pid(socket, channels, channel), Command::PwmPid { channel } => Handler::engage_pid(socket, channels, channel),
Command::PwmPolarity { channel, polarity } => Handler::set_polarity(socket, channels, channel, polarity),
Command::Pwm { channel, pin, value } => Handler::set_pwm(socket, channels, channel, pin, value), Command::Pwm { channel, pin, value } => Handler::set_pwm(socket, channels, channel, pin, value),
Command::CenterPoint { channel, center } => Handler::set_center_point(socket, channels, channel, center), Command::CenterPoint { channel, center } => Handler::set_center_point(socket, channels, channel, center),
Command::Pid { channel, parameter, value } => Handler::set_pid(socket, channels, channel, parameter, value), Command::Pid { channel, parameter, value } => Handler::set_pid(socket, channels, channel, parameter, value),

26
src/command_parser.rs
View File

@ -135,6 +135,12 @@ pub enum CenterPoint {
Override(f32), Override(f32),
} }
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum Polarity {
Normal,
Reversed,
}
#[derive(Debug, Clone, PartialEq)] #[derive(Debug, Clone, PartialEq)]
pub enum Command { pub enum Command {
Quit, Quit,
@ -157,6 +163,10 @@ pub enum Command {
PwmPid { PwmPid {
channel: usize, channel: usize,
}, },
PwmPolarity {
channel: usize,
polarity: Polarity,
},
CenterPoint { CenterPoint {
channel: usize, channel: usize,
center: CenterPoint, center: CenterPoint,
@ -297,6 +307,18 @@ fn pwm_pid(input: &[u8]) -> IResult<&[u8], ()> {
value((), tag("pid"))(input) value((), tag("pid"))(input)
} }
fn pwm_polarity(input: &[u8]) -> IResult<&[u8], Polarity> {
preceded(
tag("polarity"),
preceded(
whitespace,
alt((value(Polarity::Normal, tag("normal")),
value(Polarity::Reversed, tag("reversed"))
))
)
)(input)
}
fn pwm(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> { fn pwm(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
let (input, _) = tag("pwm")(input)?; let (input, _) = tag("pwm")(input)?;
alt(( alt((
@ -309,6 +331,10 @@ fn pwm(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
let (input, ()) = pwm_pid(input)?; let (input, ()) = pwm_pid(input)?;
Ok((input, Ok(Command::PwmPid { channel }))) Ok((input, Ok(Command::PwmPid { channel })))
}, },
|input| {
let (input, polarity) = pwm_polarity(input)?;
Ok((input, Ok(Command::PwmPolarity { channel, polarity })))
},
|input| { |input| {
let (input, config) = pwm_setup(input)?; let (input, config) = pwm_setup(input)?;
match config { match config {

7
src/config.rs
View File

@ -8,7 +8,7 @@ use uom::si::{
use crate::{ use crate::{
ad7172::PostFilter, ad7172::PostFilter,
channels::Channels, channels::Channels,
command_parser::CenterPoint, command_parser::{CenterPoint, Polarity},
pid, pid,
steinhart_hart, steinhart_hart,
}; };
@ -20,6 +20,7 @@ pub struct ChannelConfig {
pid_target: f32, pid_target: f32,
pid_engaged: bool, pid_engaged: bool,
i_set: ElectricCurrent, i_set: ElectricCurrent,
polarity: Polarity,
sh: steinhart_hart::Parameters, sh: steinhart_hart::Parameters,
pwm: PwmLimits, pwm: PwmLimits,
/// uses variant `PostFilter::Invalid` instead of `None` to save space /// uses variant `PostFilter::Invalid` instead of `None` to save space
@ -45,7 +46,8 @@ impl ChannelConfig {
pid: state.pid.parameters.clone(), pid: state.pid.parameters.clone(),
pid_target: state.pid.target as f32, pid_target: state.pid.target as f32,
pid_engaged: state.pid_engaged, pid_engaged: state.pid_engaged,
i_set: i_set, i_set,
polarity: state.polarity.clone(),
sh: state.sh.clone(), sh: state.sh.clone(),
pwm, pwm,
adc_postfilter, adc_postfilter,
@ -68,6 +70,7 @@ impl ChannelConfig {
}; };
let _ = channels.adc.set_postfilter(channel as u8, adc_postfilter); let _ = channels.adc.set_postfilter(channel as u8, adc_postfilter);
let _ = channels.set_i(channel, self.i_set); let _ = channels.set_i(channel, self.i_set);
channels.set_polarity(channel, self.polarity.clone());
} }
} }