Rename all Steinhart-Hart references to B-param

The Steinhart-Hart equation was changed in code long ago to the
B-parameter equation. Rename references to it and the interface
accordingly. The `s-h` command is now `b-p`.

The reason the name "B-Parameter" equation was chosen over
"Beta-Parameter" was due to its easier searchability.

README.md

@@ -95,13 +95,13 @@ formatted as line-delimited JSON.
 | Syntax                                    | Function                                                                      |
 |-------------------------------------------|-------------------------------------------------------------------------------|
 | `report`                                  | Show latest report of channel parameters (see *Reports* section)              |
-| `pwm`                                      | Show current PWM settings                                                     |
+| `output`                                  | Show current output settings                                                  |
-| `pwm <0/1> max_i_pos <amp>`                | Set maximum positive output current, clamped to [0, 2]                        |
+| `output <0/1> max_i_pos <amp>`            | Set maximum positive output current, clamped to [0, 2]                        |
-| `pwm <0/1> max_i_neg <amp>`                | Set maximum negative output current, clamped to [0, 2]                        |
+| `output <0/1> max_i_neg <amp>`            | Set maximum negative output current, clamped to [0, 2]                        |
-| `pwm <0/1> max_v <volt>`                   | Set maximum output voltage, clamped to [0, 4]                                 |
+| `output <0/1> max_v <volt>`               | Set maximum output voltage, clamped to [0, 4]                                 |
-| `pwm <0/1> i_set <amp>`                    | Disengage PID, set fixed output current, clamped to [-2, 2]                   |
+| `output <0/1> i_set <amp>`                | Disengage PID, set fixed output current, clamped to [-2, 2]                   |
-| `pwm <0/1> polarity <normal/reversed>`     | Set output current polarity, with 'normal' being the front panel polarity     |
+| `output <0/1> polarity <normal/reversed>` | Set output current polarity, with 'normal' being the front panel polarity     |
-| `pwm <0/1> pid`                            | Let output current to be controlled by the PID                                |
+| `output <0/1> pid`                        | Let output current to be controlled by the PID                                |
 | `center <0/1> <volt>`                     | Set the MAX1968 0A-centerpoint to the specified fixed voltage                 |
 | `center <0/1> vref`                       | Set the MAX1968 0A-centerpoint to measure from VREF                           |
 | `pid`                                     | Show PID configuration                                                        |
@@ -111,8 +111,8 @@ formatted as line-delimited JSON.
 | `pid <0/1> kd <value>`                    | Set differential gain                                                         |
 | `pid <0/1> output_min <amp>`              | Set mininum output                                                            |
 | `pid <0/1> output_max <amp>`              | Set maximum output                                                            |
-| `s-h`                                      | Show Steinhart-Hart equation parameters                                       |
+| `b-p`                                     | Show B-Parameter equation parameters                                          |
-| `s-h <0/1> <t0/b/r0> <value>`              | Set Steinhart-Hart parameter for a channel                                    |
+| `b-p <0/1> <t0/b/r0> <value>`             | Set B-Parameter for a channel                                                 |
 | `postfilter`                              | Show postfilter settings                                                      |
 | `postfilter <0/1> off`                    | Disable postfilter                                                            |
 | `postfilter <0/1> rate <rate>`            | Set postfilter output data rate                                               |
@@ -144,22 +144,22 @@ output will be truncated when USB buffers are full.
 
 Connect the thermistor with the SENS pins of the
 device. Temperature-depending resistance is measured by the AD7172
-ADC. To prepare conversion to a temperature, set the Beta parameters
+ADC. To prepare conversion to a temperature, set the parameters
-for the Steinhart-Hart equation.
+for the B-Parameter equation.
 
 Set the base temperature in degrees celsius for the channel 0 thermistor:
 ```
-s-h 0 t0 20
+b-p 0 t0 20
 ```
 
 Set the resistance in Ohms measured at the base temperature t0:
 ```
-s-h 0 r0 10000
+b-p 0 r0 10000
 ```
 
 Set the Beta parameter:
 ```
-s-h 0 b 3800
+b-p 0 b 3800
 ```
 
 ### 50/60 Hz filtering
@@ -183,7 +183,7 @@ 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.
 
-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.
+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 `output <ch> polarity reversed` TCP command.
 
 Testing heat flow direction with a low set current is recommended before installation of the TEC module.
 
@@ -192,7 +192,7 @@ Testing heat flow direction with a low set current is recommended before install
 Each MAX1968 TEC driver has analog/PWM inputs for setting
 output limits.
 
-Use the `pwm` command to see current settings and maximum values.
+Use the `output` command to see current settings and maximum values.
 
 | Limit       | Unit    | Description                   |
 | ---         | :---:   | ---                           |
@@ -203,28 +203,28 @@ Use the `pwm` command to see current settings and maximum values.
 
 Example: set the maximum voltage of channel 0 to 1.5 V.
 ```
-pwm 0 max_v 1.5
+output 0 max_v 1.5
 ```
 
 Example: set the maximum negative current of channel 0 to -3 A.
 ```
-pwm 0 max_i_neg 3
+output 0 max_i_neg 3
 ```
 
 Example: set the maximum positive current of channel 1 to 3 A.
 ```
-pwm 0 max_i_pos 3
+output 0 max_i_pos 3
 ```
 
 ### Open-loop mode
 
 To manually control TEC output current, set a fixed output current with
-the `pwm` command. Doing so will disengage the PID control for that
+the `output` command. Doing so will disengage the PID control for that
 channel.
 
 Example: set output current of channel 0 to 0 A.
 ```
-pwm 0 i_set 0
+output 0 i_set 0
 ```
 
 ## PID-stabilized temperature control
@@ -237,7 +237,7 @@ pid 0 target 20
 Enter closed-loop mode by switching control of the TEC output current
 of channel 0 to the PID algorithm:
 ```
-pwm 0 pid
+output 0 pid
 ```
 
 ## LED indicators
@@ -260,7 +260,7 @@ with the following keys.
 | `interval`     | Seconds         | Time elapsed since last report update on channel     |
 | `adc`          | Volts           | AD7172 input                                         |
 | `sens`         | Ohms            | Thermistor resistance derived from `adc`             |
-| `temperature`  | Degrees Celsius | Steinhart-Hart conversion result derived from `sens` |
+| `temperature`  | Degrees Celsius | B-Parameter conversion result derived from `sens`    |
 | `pid_engaged`  | Boolean         | `true` if in closed-loop mode                        |
 | `i_set`        | Amperes         | TEC output current                                   |
 | `dac_value`    | Volts           | AD5680 output derived from `i_set`                   |

pytec/autotune.py

@@ -253,9 +253,9 @@ def main():
 
         tuner_out = tuner.output()
 
-        tec.set_param("pwm", channel, "i_set", tuner_out)
+        tec.set_param("output", channel, "i_set", tuner_out)
 
-    tec.set_param("pwm", channel, "i_set", 0)
+    tec.set_param("output", channel, "i_set", 0)
 
 
 if __name__ == "__main__":

pytec/example.py

@@ -1,11 +1,11 @@
 from pytec.client import Client
 
 tec = Client() #(host="localhost", port=6667)
-tec.set_param("s-h", 1, "t0", 20)
+tec.set_param("b-p", 1, "t0", 20)
-print(tec.get_pwm())
+print(tec.get_output())
 print(tec.get_pid())
-print(tec.get_pwm())
+print(tec.get_output())
 print(tec.get_postfilter())
-print(tec.get_steinhart_hart())
+print(tec.get_b_parameter())
 for data in tec.report_mode():
     print(data)

pytec/pytec/client.py

@@ -13,11 +13,11 @@ class Client:
         self._check_zero_limits()
 
     def _check_zero_limits(self):
-        pwm_report = self.get_pwm()
+        output_report = self.get_output()
-        for pwm_channel in pwm_report:
+        for output_channel in output_report:
             for limit in ["max_i_neg", "max_i_pos", "max_v"]:
-                if pwm_channel[limit] == 0.0:
+                if output_channel[limit] == 0.0:
-                    logging.warning("`{}` limit is set to zero on channel {}".format(limit, pwm_channel["channel"]))
+                    logging.warning("`{}` limit is set to zero on channel {}".format(limit, output_channel["channel"]))
 
     def _read_line(self):
         # read more lines
@@ -47,8 +47,8 @@ class Client:
             result[int(item["channel"])] = item
         return result
 
-    def get_pwm(self):
+    def get_output(self):
-        """Retrieve PWM limits for the TEC
+        """Retrieve output limits for the TEC
 
         Example::
             [{'channel': 0,
@@ -67,7 +67,7 @@ class Client:
               'polarity': 'normal',
             ]
         """
-        return self._get_conf("pwm")
+        return self._get_conf("output")
 
     def get_pid(self):
         """Retrieve PID control state
@@ -92,14 +92,14 @@ class Client:
         """
         return self._get_conf("pid")
 
-    def get_steinhart_hart(self):
+    def get_b_parameter(self):
-        """Retrieve Steinhart-Hart parameters for resistance to temperature conversion
+        """Retrieve B-Parameter equation parameters for resistance to temperature conversion
 
         Example::
             [{'params': {'b': 3800.0, 'r0': 10000.0, 't0': 298.15}, 'channel': 0},
              {'params': {'b': 3800.0, 'r0': 10000.0, 't0': 298.15}, 'channel': 1}]
         """
-        return self._get_conf("s-h")
+        return self._get_conf("b-p")
 
     def get_postfilter(self):
         """Retrieve DAC postfilter configuration
@@ -144,9 +144,9 @@ class Client:
         """Set configuration parameters
 
         Examples::
-            tec.set_param("pwm", 0, "max_v", 2.0)
+            tec.set_param("output", 0, "max_v", 2.0)
             tec.set_param("pid", 1, "output_max", 2.5)
-            tec.set_param("s-h", 0, "t0", 20.0)
+            tec.set_param("b-p", 0, "t0", 20.0)
             tec.set_param("center", 0, "vref")
             tec.set_param("postfilter", 1, 21)
 
@@ -161,7 +161,7 @@ class Client:
     def power_up(self, channel, target):
         """Start closed-loop mode"""
         self.set_param("pid", channel, "target", value=target)
-        self.set_param("pwm", channel, "pid")
+        self.set_param("output", channel, "pid")
 
     def save_config(self):
         """Save current configuration to EEPROM"""

src/b_parameter.rs

@@ -2,27 +2,28 @@ use num_traits::float::Float;
 use serde::{Deserialize, Serialize};
 use uom::si::{
     electrical_resistance::ohm,
-    f64::{ElectricalResistance, ThermodynamicTemperature},
+    f64::{ElectricalResistance, TemperatureInterval, ThermodynamicTemperature},
     ratio::ratio,
+    temperature_interval::kelvin as kelvin_interval,
     thermodynamic_temperature::{degree_celsius, kelvin},
 };
 
-/// Steinhart-Hart equation parameters
+/// B-Parameter equation parameters
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct Parameters {
     /// Base temperature
     pub t0: ThermodynamicTemperature,
-    /// Base resistance
+    /// Thermistor resistance at base temperature
     pub r0: ElectricalResistance,
-    /// Beta
+    /// Beta (average slope of the function ln R vs. 1/T)
-    pub b: f64,
+    pub b: TemperatureInterval,
 }
 
 impl Parameters {
-    /// Perform the voltage to temperature conversion.
+    /// Perform the resistance to temperature conversion.
     pub fn get_temperature(&self, r: ElectricalResistance) -> ThermodynamicTemperature {
-        let inv_temp = 1.0 / self.t0.get::<kelvin>() + (r / self.r0).get::<ratio>().ln() / self.b;
+        let temp = (self.t0.recip() + (r / self.r0).get::<ratio>().ln() / self.b).recip();
-        ThermodynamicTemperature::new::<kelvin>(1.0 / inv_temp)
+        ThermodynamicTemperature::new::<kelvin>(temp.get::<kelvin_interval>())
     }
 }
 
@@ -31,7 +32,7 @@ impl Default for Parameters {
         Parameters {
             t0: ThermodynamicTemperature::new::<degree_celsius>(25.0),
             r0: ElectricalResistance::new::<ohm>(10_000.0),
-            b: 3800.0,
+            b: TemperatureInterval::new::<kelvin_interval>(3800.0),
         }
     }
 }

src/channel_state.rs

@@ -1,9 +1,10 @@
 use crate::{
-    ad7172,
+    ad7172, b_parameter as bp,
     command_parser::{CenterPoint, Polarity},
     config::PwmLimits,
-    pid, steinhart_hart as sh,
+    pid,
 };
+use num_traits::Zero;
 use smoltcp::time::{Duration, Instant};
 use uom::si::{
     electric_current::ampere,
@@ -31,7 +32,7 @@ pub struct ChannelState {
     pub pwm_limits: PwmLimits,
     pub pid_engaged: bool,
     pub pid: pid::Controller,
-    pub sh: sh::Parameters,
+    pub bp: bp::Parameters,
     pub polarity: Polarity,
 }
 
@@ -47,13 +48,13 @@ impl ChannelState {
             dac_value: ElectricPotential::new::<volt>(0.0),
             i_set: ElectricCurrent::new::<ampere>(0.0),
             pwm_limits: PwmLimits {
-                max_v: 0.0,
+                max_v: ElectricPotential::zero(),
-                max_i_pos: 0.0,
+                max_i_pos: ElectricCurrent::zero(),
-                max_i_neg: 0.0,
+                max_i_neg: ElectricCurrent::zero(),
             },
             pid_engaged: false,
             pid: pid::Controller::new(pid::Parameters::default()),
-            sh: sh::Parameters::default(),
+            bp: bp::Parameters::default(),
             polarity: Polarity::Normal,
         }
     }
@@ -99,7 +100,7 @@ impl ChannelState {
 
     pub fn get_temperature(&self) -> Option<ThermodynamicTemperature> {
         let r = self.get_sens()?;
-        let temperature = self.sh.get_temperature(r);
+        let temperature = self.bp.get_temperature(r);
         Some(temperature)
     }
 }

src/channels.rs

@@ -1,12 +1,11 @@
 use crate::timer::sleep;
 use crate::{
-    ad5680, ad7172,
+    ad5680, ad7172, b_parameter,
     channel::{Channel, Channel0, Channel1},
     channel_state::ChannelState,
     command_handler::JsonBuffer,
     command_parser::{CenterPoint, Polarity, PwmPin},
     pins::{self, Channel0VRef, Channel1VRef},
-    steinhart_hart,
 };
 use core::marker::PhantomData;
 use heapless::{consts::U2, Vec};
@@ -144,7 +143,7 @@ impl Channels {
         voltage
     }
 
-    pub fn get_i(&mut self, channel: usize) -> ElectricCurrent {
+    pub fn get_i_set(&mut self, channel: usize) -> ElectricCurrent {
         let i_set = self.channel_state(channel).i_set;
         i_set
     }
@@ -364,15 +363,15 @@ impl Channels {
     }
 
     pub fn get_max_v(&mut self, channel: usize) -> ElectricPotential {
-        ElectricPotential::new::<volt>(self.channel_state(channel).pwm_limits.max_v)
+        self.channel_state(channel).pwm_limits.max_v
     }
 
     pub fn get_max_i_pos(&mut self, channel: usize) -> ElectricCurrent {
-        ElectricCurrent::new::<ampere>(self.channel_state(channel).pwm_limits.max_i_pos)
+        self.channel_state(channel).pwm_limits.max_i_pos
     }
 
     pub fn get_max_i_neg(&mut self, channel: usize) -> ElectricCurrent {
-        ElectricCurrent::new::<ampere>(self.channel_state(channel).pwm_limits.max_i_neg)
+        self.channel_state(channel).pwm_limits.max_i_neg
     }
 
     // Get current passing through TEC
@@ -420,7 +419,7 @@ impl Channels {
         let max_v = max_v.min(MAX_TEC_V).max(ElectricPotential::zero());
         let duty = (max_v / max).get::<ratio>();
         let duty = self.set_pwm(channel, PwmPin::MaxV, duty);
-        self.channel_state(channel).pwm_limits.max_v = max_v.get::<volt>();
+        self.channel_state(channel).pwm_limits.max_v = max_v;
         (duty * max, max)
     }
 
@@ -436,7 +435,7 @@ impl Channels {
             Polarity::Normal => self.set_pwm(channel, PwmPin::MaxIPos, duty),
             Polarity::Reversed => self.set_pwm(channel, PwmPin::MaxINeg, duty),
         };
-        self.channel_state(channel).pwm_limits.max_i_pos = max_i_pos.get::<ampere>();
+        self.channel_state(channel).pwm_limits.max_i_pos = max_i_pos;
         (duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, max)
     }
 
@@ -452,7 +451,7 @@ impl Channels {
             Polarity::Normal => self.set_pwm(channel, PwmPin::MaxINeg, duty),
             Polarity::Reversed => self.set_pwm(channel, PwmPin::MaxIPos, duty),
         };
-        self.channel_state(channel).pwm_limits.max_i_neg = max_i_neg.get::<ampere>();
+        self.channel_state(channel).pwm_limits.max_i_neg = max_i_neg;
         (duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, max)
     }
 
@@ -470,7 +469,7 @@ impl Channels {
     }
 
     fn report(&mut self, channel: usize) -> Report {
-        let i_set = self.get_i(channel);
+        let i_set = self.get_i_set(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);
@@ -521,11 +520,11 @@ impl Channels {
         false
     }
 
-    fn pwm_summary(&mut self, channel: usize) -> PwmSummary {
+    fn output_summary(&mut self, channel: usize) -> OutputSummary {
-        PwmSummary {
+        OutputSummary {
             channel,
             center: CenterPointJson(self.channel_state(channel).center.clone()),
-            i_set: self.get_i(channel),
+            i_set: self.get_i_set(channel),
             max_v: self.get_max_v(channel),
             max_i_pos: self.get_max_i_pos(channel),
             max_i_neg: self.get_max_i_neg(channel),
@@ -533,10 +532,10 @@ impl Channels {
         }
     }
 
-    pub fn pwm_summaries_json(&mut self) -> Result<JsonBuffer, serde_json_core::ser::Error> {
+    pub fn output_summaries_json(&mut self) -> Result<JsonBuffer, serde_json_core::ser::Error> {
         let mut summaries = Vec::<_, U2>::new();
         for channel in 0..CHANNELS {
-            let _ = summaries.push(self.pwm_summary(channel));
+            let _ = summaries.push(self.output_summary(channel));
         }
         serde_json_core::to_vec(&summaries)
     }
@@ -558,17 +557,17 @@ impl Channels {
         serde_json_core::to_vec(&summaries)
     }
 
-    fn steinhart_hart_summary(&mut self, channel: usize) -> SteinhartHartSummary {
+    fn b_parameter_summary(&mut self, channel: usize) -> BParameterSummary {
-        let params = self.channel_state(channel).sh.clone();
+        let params = self.channel_state(channel).bp.clone();
-        SteinhartHartSummary { channel, params }
+        BParameterSummary { channel, params }
     }
 
-    pub fn steinhart_hart_summaries_json(
+    pub fn b_parameter_summaries_json(
         &mut self,
     ) -> Result<JsonBuffer, serde_json_core::ser::Error> {
         let mut summaries = Vec::<_, U2>::new();
         for channel in 0..CHANNELS {
-            let _ = summaries.push(self.steinhart_hart_summary(channel));
+            let _ = summaries.push(self.b_parameter_summary(channel));
         }
         serde_json_core::to_vec(&summaries)
     }
@@ -630,7 +629,7 @@ impl Serialize for PolarityJson {
 }
 
 #[derive(Serialize)]
-pub struct PwmSummary {
+pub struct OutputSummary {
     channel: usize,
     center: CenterPointJson,
     i_set: ElectricCurrent,
@@ -647,7 +646,7 @@ pub struct PostFilterSummary {
 }
 
 #[derive(Serialize)]
-pub struct SteinhartHartSummary {
+pub struct BParameterSummary {
     channel: usize,
-    params: steinhart_hart::Parameters,
+    params: b_parameter::Parameters,
 }

src/command_handler.rs

@@ -2,7 +2,7 @@ use super::{
     ad7172,
     channels::{Channels, CHANNELS},
     command_parser::{
-        CenterPoint, Command, Ipv4Config, PidParameter, Polarity, PwmPin, ShParameter, ShowCommand,
+        BpParameter, CenterPoint, Command, Ipv4Config, PidParameter, Polarity, PwmPin, ShowCommand,
     },
     config::ChannelConfig,
     dfu,
@@ -19,7 +19,11 @@ use uom::si::{
     electric_current::ampere,
     electric_potential::volt,
     electrical_resistance::ohm,
-    f64::{ElectricCurrent, ElectricPotential, ElectricalResistance, ThermodynamicTemperature},
+    f64::{
+        ElectricCurrent, ElectricPotential, ElectricalResistance, TemperatureInterval,
+        ThermodynamicTemperature,
+    },
+    temperature_interval::kelvin,
     thermodynamic_temperature::degree_celsius,
 };
 
@@ -96,7 +100,7 @@ impl Handler {
     }
 
     fn show_pwm(socket: &mut TcpSocket, channels: &mut Channels) -> Result<Handler, Error> {
-        match channels.pwm_summaries_json() {
+        match channels.output_summaries_json() {
             Ok(buf) => {
                 send_line(socket, &buf);
             }
@@ -109,16 +113,13 @@ impl Handler {
         Ok(Handler::Handled)
     }
 
-    fn show_steinhart_hart(
+    fn show_b_parameter(socket: &mut TcpSocket, channels: &mut Channels) -> Result<Handler, Error> {
-        socket: &mut TcpSocket,
+        match channels.b_parameter_summaries_json() {
-        channels: &mut Channels,
-    ) -> Result<Handler, Error> {
-        match channels.steinhart_hart_summaries_json() {
             Ok(buf) => {
                 send_line(socket, &buf);
             }
             Err(e) => {
-                error!("unable to serialize steinhart-hart summaries: {:?}", e);
+                error!("unable to serialize b parameter summaries: {:?}", e);
                 let _ = writeln!(socket, "{{\"error\":\"{:?}\"}}", e);
                 return Err(Error::Report);
             }
@@ -206,7 +207,7 @@ impl Handler {
         channel: usize,
         center: CenterPoint,
     ) -> Result<Handler, Error> {
-        let i_set = channels.get_i(channel);
+        let i_set = channels.get_i_set(channel);
         let state = channels.channel_state(channel);
         state.center = center;
         if !state.pid_engaged {
@@ -237,19 +238,19 @@ impl Handler {
         Ok(Handler::Handled)
     }
 
-    fn set_steinhart_hart(
+    fn set_b_parameter(
         socket: &mut TcpSocket,
         channels: &mut Channels,
         channel: usize,
-        parameter: ShParameter,
+        parameter: BpParameter,
         value: f64,
     ) -> Result<Handler, Error> {
-        let sh = &mut channels.channel_state(channel).sh;
+        let bp = &mut channels.channel_state(channel).bp;
-        use super::command_parser::ShParameter::*;
+        use super::command_parser::BpParameter::*;
         match parameter {
-            T0 => sh.t0 = ThermodynamicTemperature::new::<degree_celsius>(value),
+            T0 => bp.t0 = ThermodynamicTemperature::new::<degree_celsius>(value),
-            B => sh.b = value,
+            B => bp.b = TemperatureInterval::new::<kelvin>(value),
-            R0 => sh.r0 = ElectricalResistance::new::<ohm>(value),
+            R0 => bp.r0 = ElectricalResistance::new::<ohm>(value),
         }
         send_line(socket, b"{}");
         Ok(Handler::Handled)
@@ -475,17 +476,15 @@ impl Handler {
             Command::Quit => Ok(Handler::CloseSocket),
             Command::Show(ShowCommand::Input) => Handler::show_report(socket, channels),
             Command::Show(ShowCommand::Pid) => Handler::show_pid(socket, channels),
-            Command::Show(ShowCommand::Pwm) => Handler::show_pwm(socket, channels),
+            Command::Show(ShowCommand::Output) => Handler::show_pwm(socket, channels),
-            Command::Show(ShowCommand::SteinhartHart) => {
+            Command::Show(ShowCommand::BParameter) => Handler::show_b_parameter(socket, channels),
-                Handler::show_steinhart_hart(socket, channels)
-            }
             Command::Show(ShowCommand::PostFilter) => Handler::show_post_filter(socket, channels),
             Command::Show(ShowCommand::Ipv4) => Handler::show_ipv4(socket, ipv4_config),
-            Command::PwmPid { channel } => Handler::engage_pid(socket, channels, channel),
+            Command::OutputPid { channel } => Handler::engage_pid(socket, channels, channel),
-            Command::PwmPolarity { channel, polarity } => {
+            Command::OutputPolarity { channel, polarity } => {
                 Handler::set_polarity(socket, channels, channel, polarity)
             }
-            Command::Pwm {
+            Command::Output {
                 channel,
                 pin,
                 value,
@@ -498,11 +497,11 @@ impl Handler {
                 parameter,
                 value,
             } => Handler::set_pid(socket, channels, channel, parameter, value),
-            Command::SteinhartHart {
+            Command::BParameter {
                 channel,
                 parameter,
                 value,
-            } => Handler::set_steinhart_hart(socket, channels, channel, parameter, value),
+            } => Handler::set_b_parameter(socket, channels, channel, parameter, value),
             Command::PostFilter {
                 channel,
                 rate: None,

src/command_parser.rs

@@ -91,9 +91,9 @@ pub struct Ipv4Config {
 #[derive(Debug, Clone, PartialEq)]
 pub enum ShowCommand {
     Input,
-    Pwm,
+    Output,
     Pid,
-    SteinhartHart,
+    BParameter,
     PostFilter,
     Ipv4,
 }
@@ -108,9 +108,9 @@ pub enum PidParameter {
     OutputMax,
 }
 
-/// Steinhart-Hart equation parameter
+/// B-Parameter equation parameter
 #[derive(Debug, Clone, PartialEq)]
-pub enum ShParameter {
+pub enum BpParameter {
     T0,
     B,
     R0,
@@ -149,16 +149,16 @@ pub enum Command {
     Ipv4(Ipv4Config),
     Show(ShowCommand),
     /// PWM parameter setting
-    Pwm {
+    Output {
         channel: usize,
         pin: PwmPin,
         value: f64,
     },
     /// Enable PID control for `i_set`
-    PwmPid {
+    OutputPid {
         channel: usize,
     },
-    PwmPolarity {
+    OutputPolarity {
         channel: usize,
         polarity: Polarity,
     },
@@ -172,9 +172,9 @@ pub enum Command {
         parameter: PidParameter,
         value: f64,
     },
-    SteinhartHart {
+    BParameter {
         channel: usize,
-        parameter: ShParameter,
+        parameter: BpParameter,
         value: f64,
     },
     PostFilter {
@@ -260,12 +260,12 @@ fn pwm_setup(input: &[u8]) -> IResult<&[u8], Result<(PwmPin, f64), Error>> {
     ))(input)
 }
 
-/// `pwm <0-1> pid` - Set PWM to be controlled by PID
+/// `output <0-1> pid` - Set output to be controlled by PID
-fn pwm_pid(input: &[u8]) -> IResult<&[u8], ()> {
+fn output_pid(input: &[u8]) -> IResult<&[u8], ()> {
     value((), tag("pid"))(input)
 }
 
-fn pwm_polarity(input: &[u8]) -> IResult<&[u8], Polarity> {
+fn output_polarity(input: &[u8]) -> IResult<&[u8], Polarity> {
     preceded(
         tag("polarity"),
         preceded(
@@ -278,8 +278,8 @@ fn pwm_polarity(input: &[u8]) -> IResult<&[u8], Polarity> {
     )(input)
 }
 
-fn pwm(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
+fn output(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
-    let (input, _) = tag("pwm")(input)?;
+    let (input, _) = tag("output")(input)?;
     alt((
         |input| {
             let (input, _) = whitespace(input)?;
@@ -287,19 +287,19 @@ fn pwm(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
             let (input, _) = whitespace(input)?;
             let (input, result) = alt((
                 |input| {
-                    let (input, ()) = pwm_pid(input)?;
+                    let (input, ()) = output_pid(input)?;
-                    Ok((input, Ok(Command::PwmPid { channel })))
+                    Ok((input, Ok(Command::OutputPid { channel })))
                 },
                 |input| {
-                    let (input, polarity) = pwm_polarity(input)?;
+                    let (input, polarity) = output_polarity(input)?;
-                    Ok((input, Ok(Command::PwmPolarity { channel, polarity })))
+                    Ok((input, Ok(Command::OutputPolarity { channel, polarity })))
                 },
                 |input| {
                     let (input, config) = pwm_setup(input)?;
                     match config {
                         Ok((pin, value)) => Ok((
                             input,
-                            Ok(Command::Pwm {
+                            Ok(Command::Output {
                                 channel,
                                 pin,
                                 value,
@@ -312,7 +312,7 @@ fn pwm(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
             end(input)?;
             Ok((input, result))
         },
-        value(Ok(Command::Show(ShowCommand::Pwm)), end),
+        value(Ok(Command::Show(ShowCommand::Output)), end),
     ))(input)
 }
 
@@ -366,18 +366,18 @@ fn pid(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
     ))(input)
 }
 
-/// `s-h <0-1> <parameter> <value>`
+/// `b-p <0-1> <parameter> <value>`
-fn steinhart_hart_parameter(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
+fn b_parameter_parameter(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
     let (input, channel) = channel(input)?;
     let (input, _) = whitespace(input)?;
     let (input, parameter) = alt((
-        value(ShParameter::T0, tag("t0")),
+        value(BpParameter::T0, tag("t0")),
-        value(ShParameter::B, tag("b")),
+        value(BpParameter::B, tag("b")),
-        value(ShParameter::R0, tag("r0")),
+        value(BpParameter::R0, tag("r0")),
     ))(input)?;
     let (input, _) = whitespace(input)?;
     let (input, value) = float(input)?;
-    let result = value.map(|value| Command::SteinhartHart {
+    let result = value.map(|value| Command::BParameter {
         channel,
         parameter,
         value,
@@ -385,12 +385,12 @@ fn steinhart_hart_parameter(input: &[u8]) -> IResult<&[u8], Result<Command, Erro
     Ok((input, result))
 }
 
-/// `s-h` | `s-h <steinhart_hart_parameter>`
+/// `b-p` | `b-p <b_parameter_parameter>`
-fn steinhart_hart(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
+fn b_parameter(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
-    let (input, _) = tag("s-h")(input)?;
+    let (input, _) = tag("b-p")(input)?;
     alt((
-        preceded(whitespace, steinhart_hart_parameter),
+        preceded(whitespace, b_parameter_parameter),
-        value(Ok(Command::Show(ShowCommand::SteinhartHart)), end),
+        value(Ok(Command::Show(ShowCommand::BParameter)), end),
     ))(input)
 }
 
@@ -569,10 +569,10 @@ fn command(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
         value(Ok(Command::Reset), tag("reset")),
         ipv4,
         map(report, Ok),
-        pwm,
+        output,
         center_point,
         pid,
-        steinhart_hart,
+        b_parameter,
         postfilter,
         value(Ok(Command::Dfu), tag("dfu")),
         fan,
@@ -664,11 +664,11 @@ mod test {
     }
 
     #[test]
-    fn parse_pwm_i_set() {
+    fn parse_output_i_set() {
-        let command = Command::parse(b"pwm 1 i_set 16383");
+        let command = Command::parse(b"output 1 i_set 16383");
         assert_eq!(
             command,
-            Ok(Command::Pwm {
+            Ok(Command::Output {
                 channel: 1,
                 pin: PwmPin::ISet,
                 value: 16383.0,
@@ -677,11 +677,11 @@ mod test {
     }
 
     #[test]
-    fn parse_pwm_polarity() {
+    fn parse_output_polarity() {
         let command = Command::parse(b"pwm 0 polarity reversed");
         assert_eq!(
             command,
-            Ok(Command::PwmPolarity {
+            Ok(Command::OutputPolarity {
                 channel: 0,
                 polarity: Polarity::Reversed,
             })
@@ -689,17 +689,17 @@ mod test {
     }
 
     #[test]
-    fn parse_pwm_pid() {
+    fn parse_output_pid() {
-        let command = Command::parse(b"pwm 0 pid");
+        let command = Command::parse(b"output 0 pid");
-        assert_eq!(command, Ok(Command::PwmPid { channel: 0 }));
+        assert_eq!(command, Ok(Command::OutputPid { channel: 0 }));
     }
 
     #[test]
-    fn parse_pwm_max_i_pos() {
+    fn parse_output_max_i_pos() {
-        let command = Command::parse(b"pwm 0 max_i_pos 7");
+        let command = Command::parse(b"output 0 max_i_pos 7");
         assert_eq!(
             command,
-            Ok(Command::Pwm {
+            Ok(Command::Output {
                 channel: 0,
                 pin: PwmPin::MaxIPos,
                 value: 7.0,
@@ -708,11 +708,11 @@ mod test {
     }
 
     #[test]
-    fn parse_pwm_max_i_neg() {
+    fn parse_output_max_i_neg() {
-        let command = Command::parse(b"pwm 0 max_i_neg 128");
+        let command = Command::parse(b"output 0 max_i_neg 128");
         assert_eq!(
             command,
-            Ok(Command::Pwm {
+            Ok(Command::Output {
                 channel: 0,
                 pin: PwmPin::MaxINeg,
                 value: 128.0,
@@ -721,11 +721,11 @@ mod test {
     }
 
     #[test]
-    fn parse_pwm_max_v() {
+    fn parse_output_max_v() {
-        let command = Command::parse(b"pwm 0 max_v 32768");
+        let command = Command::parse(b"output 0 max_v 32768");
         assert_eq!(
             command,
-            Ok(Command::Pwm {
+            Ok(Command::Output {
                 channel: 0,
                 pin: PwmPin::MaxV,
                 value: 32768.0,
@@ -753,19 +753,19 @@ mod test {
     }
 
     #[test]
-    fn parse_steinhart_hart() {
+    fn parse_b_parameter() {
-        let command = Command::parse(b"s-h");
+        let command = Command::parse(b"b-p");
-        assert_eq!(command, Ok(Command::Show(ShowCommand::SteinhartHart)));
+        assert_eq!(command, Ok(Command::Show(ShowCommand::BParameter)));
     }
 
     #[test]
-    fn parse_steinhart_hart_set() {
+    fn parse_b_parameter_set() {
-        let command = Command::parse(b"s-h 1 t0 23.05");
+        let command = Command::parse(b"b-p 1 t0 23.05");
         assert_eq!(
             command,
-            Ok(Command::SteinhartHart {
+            Ok(Command::BParameter {
                 channel: 1,
-                parameter: ShParameter::T0,
+                parameter: BpParameter::T0,
                 value: 23.05,
             })
         );

src/config.rs

@@ -1,16 +1,13 @@
 use crate::{
     ad7172::PostFilter,
+    b_parameter,
     channels::Channels,
     command_parser::{CenterPoint, Polarity},
-    pid, steinhart_hart,
+    pid,
 };
 use num_traits::Zero;
 use serde::{Deserialize, Serialize};
-use uom::si::{
+use uom::si::f64::{ElectricCurrent, ElectricPotential};
-    electric_current::ampere,
-    electric_potential::volt,
-    f64::{ElectricCurrent, ElectricPotential},
-};
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct ChannelConfig {
@@ -20,7 +17,7 @@ pub struct ChannelConfig {
     pid_engaged: bool,
     i_set: ElectricCurrent,
     polarity: Polarity,
-    sh: steinhart_hart::Parameters,
+    bp: b_parameter::Parameters,
     pwm: PwmLimits,
     /// uses variant `PostFilter::Invalid` instead of `None` to save space
     adc_postfilter: PostFilter,
@@ -49,7 +46,7 @@ impl ChannelConfig {
             pid_engaged: state.pid_engaged,
             i_set,
             polarity: state.polarity.clone(),
-            sh: state.sh.clone(),
+            bp: state.bp.clone(),
             pwm,
             adc_postfilter,
         }
@@ -61,7 +58,7 @@ impl ChannelConfig {
         state.pid.parameters = self.pid.clone();
         state.pid.target = self.pid_target.into();
         state.pid_engaged = self.pid_engaged;
-        state.sh = self.sh.clone();
+        state.bp = self.bp.clone();
 
         self.pwm.apply(channels, channel);
 
@@ -77,9 +74,9 @@ impl ChannelConfig {
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct PwmLimits {
-    pub max_v: f64,
+    pub max_v: ElectricPotential,
-    pub max_i_pos: f64,
+    pub max_i_pos: ElectricCurrent,
-    pub max_i_neg: f64,
+    pub max_i_neg: ElectricCurrent,
 }
 
 impl PwmLimits {
@@ -88,15 +85,15 @@ impl PwmLimits {
         let max_i_pos = channels.get_max_i_pos(channel);
         let max_i_neg = channels.get_max_i_neg(channel);
         PwmLimits {
-            max_v: max_v.get::<volt>(),
+            max_v,
-            max_i_pos: max_i_pos.get::<ampere>(),
+            max_i_pos,
-            max_i_neg: max_i_neg.get::<ampere>(),
+            max_i_neg,
         }
     }
 
     pub fn apply(&self, channels: &mut Channels, channel: usize) {
-        channels.set_max_v(channel, ElectricPotential::new::<volt>(self.max_v));
+        channels.set_max_v(channel, self.max_v);
-        channels.set_max_i_pos(channel, ElectricCurrent::new::<ampere>(self.max_i_pos));
+        channels.set_max_i_pos(channel, self.max_i_pos);
-        channels.set_max_i_neg(channel, ElectricCurrent::new::<ampere>(self.max_i_neg));
+        channels.set_max_i_neg(channel, self.max_i_neg);
     }
 }

src/main.rs

@@ -35,9 +35,9 @@ mod session;
 use session::{Session, SessionInput};
 mod command_parser;
 use command_parser::Ipv4Config;
+mod b_parameter;
 mod channels;
 mod pid;
-mod steinhart_hart;
 mod timer;
 use channels::{Channels, CHANNELS};
 mod channel;