Show polarity in pwm command

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.

.gitignore

@@ -1,2 +1,5 @@
 target/
 result
+*.bin
+
+__pycache__/

README.md

@@ -84,9 +84,7 @@ invalidate the first line of input.
 
 ### Reading ADC input
 
-Set report mode to `on` for a continuous stream of input data.
-
-The scope of this setting is per TCP session.
+ADC input data is provided in reports. Query for the latest report with the command `report`. See the *Reports* section below.
 
 
 ### TCP commands
@@ -94,42 +92,43 @@ The scope of this setting is per TCP session.
 Send commands as simple text string terminated by `\n`. Responses are
 formatted as line-delimited JSON.
 
-| Syntax                           | Function                                                                      |
-|----------------------------------|-------------------------------------------------------------------------------|
-| `report`                         | Show current input                                                            |
-| `report mode`                    | Show current report mode                                                      |
-| `report mode <off/on>`           | Set report mode                                                               |
-| `pwm`                            | Show current PWM settings                                                     |
-| `pwm <0/1> max_i_pos <amp>`      | Set maximum positive output current                                           |
-| `pwm <0/1> max_i_neg <amp>`      | Set maximum negative output current                                           |
-| `pwm <0/1> max_v <volt>`         | Set maximum output voltage                                                    |
-| `pwm <0/1> i_set <amp>`          | Disengage PID, set fixed output current                                       |
-| `pwm <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                                                        |
-| `pid <0/1> target <deg_celsius>` | Set the PID controller target temperature                                     |
-| `pid <0/1> kp <value>`           | Set proportional gain                                                         |
-| `pid <0/1> ki <value>`           | Set integral gain                                                             |
-| `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                                       |
-| `s-h <0/1> <t0/b/r0> <value>`    | Set Steinhart-Hart parameter for a channel                                    |
-| `postfilter`                     | Show postfilter settings                                                      |
-| `postfilter <0/1> off`           | Disable postfilter                                                            |
-| `postfilter <0/1> rate <rate>`   | Set postfilter output data rate                                               |
-| `load [0/1]`                     | Restore configuration for channel all/0/1 from flash                          |
-| `save [0/1]`                     | Save configuration for channel all/0/1 to flash                               |
-| `reset`                          | Reset the device                                                              |
-| `dfu`                            | Reset device and enters USB device firmware update (DFU) mode                 |
-| `ipv4 <X.X.X.X/L> [Y.Y.Y.Y]`     | Configure IPv4 address, netmask length, and optional default gateway          |
-| `fan`                            | Show current fan settings and sensors' measurements                           |
-| `fan <value>`                    | Set fan power with values from 1 to 100                                       |
-| `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                            |
+| Syntax                                     | Function                                                                      |
+|------------------------------------------- |-------------------------------------------------------------------------------|
+| `report`                                   | Show current input                                                            |
+| `report mode`                              | Show current report mode                                                      |
+| `report mode <off/on>`                     | Set report mode                                                               |
+| `pwm`                                      | Show current PWM settings                                                     |
+| `pwm <0/1> max_i_pos <amp>`                | Set maximum positive output current                                           |
+| `pwm <0/1> max_i_neg <amp>`                | Set maximum negative output current                                           |
+| `pwm <0/1> max_v <volt>`                   | Set maximum output voltage                                                    |
+| `pwm <0/1> i_set <amp>`                    | Disengage PID, set fixed output current                                       |
+| `pwm <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                                |
+| `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                                                        |
+| `pid <0/1> target <deg_celsius>`           | Set the PID controller target temperature                                     |
+| `pid <0/1> kp <value>`                     | Set proportional gain                                                         |
+| `pid <0/1> ki <value>`                     | Set integral gain                                                             |
+| `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                                       |
+| `s-h <0/1> <t0/b/r0> <value>`              | Set Steinhart-Hart parameter for a channel                                    |
+| `postfilter`                               | Show postfilter settings                                                      |
+| `postfilter <0/1> off`                     | Disable postfilter                                                            |
+| `postfilter <0/1> rate <rate>`             | Set postfilter output data rate                                               |
+| `load [0/1]`                               | Restore configuration for channel all/0/1 from flash                          |
+| `save [0/1]`                               | Save configuration for channel all/0/1 to flash                               |
+| `reset`                                    | Reset the device                                                              |
+| `dfu`                                      | Reset device and enters USB device firmware update (DFU) mode                 |
+| `ipv4 <X.X.X.X/L> [Y.Y.Y.Y]`               | Configure IPv4 address, netmask length, and optional default gateway          |
+| `fan`                                      | Show current fan settings and sensors' measurements                           |
+| `fan <value>`                              | Set fan power with values from 1 to 100                                       |
+| `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
@@ -186,6 +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.
 
+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.
 
 ### Limits
@@ -251,8 +252,7 @@ pwm 0 pid
 
 ## Reports
 
-Use the bare `report` command to obtain a single report. Enable
-continuous reporting with `report mode on`. Reports are JSON objects
+Use the bare `report` command to obtain a single report. Reports are JSON objects
 with the following keys.
 
 | Key            | Unit            | Description                                          |

flake.nix

@@ -63,7 +63,7 @@
         name = "thermostat-dev-shell";
         packages = with pkgs; [
           rust llvm
-          openocd dfu-util
+          openocd dfu-util rlwrap
           ] ++ (with python3Packages; [
             numpy matplotlib
           ]);

pytec/pytec/client.py

@@ -1,6 +1,7 @@
 import socket
 import json
 import logging
+import time
 
 class CommandError(Exception):
     pass
@@ -56,12 +57,14 @@ class Client:
               'max_i_neg': {'max': 3.0, 'value': 3.0},
               'max_v': {'max': 5.988, 'value': 5.988},
               'max_i_pos': {'max': 3.0, 'value': 3.0}},
+              'polarity': 'normal',
              {'channel': 1,
               'center': 'vref',
               'i_set': {'max': 2.9802790335151985, 'value': -0.02002179650216762},
               'max_i_neg': {'max': 3.0, 'value': 3.0},
               'max_v': {'max': 5.988, 'value': 5.988},
               'max_i_pos': {'max': 3.0, 'value': 3.0}}
+              'polarity': 'normal',
             ]
         """
         return self._get_conf("pwm")
@@ -126,9 +129,8 @@ class Client:
              'tec_u_meas': 2.5340000000000003,
              'pid_output': 2.067581958092247}
         """
-        self._command("report mode", "on")
-
         while True:
+            self._socket.sendall("report\n".encode('utf-8'))
             line = self._read_line()
             if not line:
                 break
@@ -136,6 +138,7 @@ class Client:
                 yield json.loads(line)
             except json.decoder.JSONDecodeError:
                 pass
+            time.sleep(0.05)
 
     def set_param(self, topic, channel, field="", value=""):
         """Set configuration parameters

src/channel_state.rs

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

src/channels.rs

@@ -17,11 +17,12 @@ use crate::{
     ad7172,
     channel::{Channel, Channel0, Channel1},
     channel_state::ChannelState,
-    command_parser::{CenterPoint, PwmPin},
+    command_parser::{CenterPoint, PwmPin, Polarity},
     command_handler::JsonBuffer,
     pins::{self, Channel0VRef, Channel1VRef},
     steinhart_hart,
 };
+use crate::timer::sleep;
 
 pub enum PinsAdcReadTarget {
     VREF,
@@ -44,7 +45,11 @@ pub const MAX_TEC_V: ElectricPotential = ElectricPotential {
     units: PhantomData,
     value: 4.0,
 };
-
+const MAX_TEC_I_DUTY_TO_CURRENT_RATE: ElectricCurrent = ElectricCurrent {
+    dimension: PhantomData,
+    units: PhantomData,
+    value: 1.0 / (10.0 * R_SENSE / 3.3),
+};
 // DAC chip outputs 0-5v, which is then passed through a resistor dividor to provide 0-3v range
 const DAC_OUT_V_MAX: ElectricPotential = ElectricPotential {
     dimension: PhantomData,
@@ -153,6 +158,11 @@ impl Channels {
 
     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);
+        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() {
             0 => self.channel0.vref_meas,
             1 => self.channel1.vref_meas,
@@ -160,10 +170,9 @@ impl Channels {
         };
         let center_point = vref_meas;
         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 i_set = (voltage - center_point) / (10.0 * r_sense);
-        self.channel_state(channel).i_set = i_set;
+        let i_set = negate * (voltage - center_point) / (10.0 * r_sense);
         i_set
     }
 
@@ -269,17 +278,6 @@ impl Channels {
         }
     }
 
-    pub fn read_dac_feedback_until_stable(&mut self, channel: usize, tolerance: ElectricPotential) -> ElectricPotential {
-        let mut prev = self.adc_read(channel, PinsAdcReadTarget::DacVfb, 1);
-        loop {
-            let current = self.adc_read(channel, PinsAdcReadTarget::DacVfb, 1);
-            if (current - prev).abs() < tolerance {
-                return current;
-            }
-            prev = current;
-        }
-    }
-
     /// 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.
@@ -306,8 +304,7 @@ impl Channels {
         let mut start_value = 1;
         let mut best_error = ElectricPotential::new::<volt>(100.0);
 
-        for step in (0..18).rev() {
-            let mut prev_value = start_value;
+        for step in (5..18).rev() {
             for value in (start_value..=ad5680::MAX_VALUE).step_by(1 << step) {
                 match channel {
                     0 => {
@@ -318,14 +315,15 @@ impl Channels {
                     }
                     _ => unreachable!(),
                 }
+                sleep(10);
 
-                let dac_feedback = self.read_dac_feedback_until_stable(channel, ElectricPotential::new::<volt>(0.001));
+                let dac_feedback = self.adc_read(channel, PinsAdcReadTarget::DacVfb, 64);
                 let error = target_voltage - dac_feedback;
                 if error < ElectricPotential::new::<volt>(0.0) {
                     break;
                 } else if error < best_error {
                     best_error = error;
-                    start_value = prev_value;
+                    start_value = value;
 
                     let vref = (value as f64 / ad5680::MAX_VALUE as f64) * DAC_OUT_V_MAX;
                     match channel {
@@ -334,8 +332,6 @@ impl Channels {
                         _ => unreachable!(),
                     }
                 }
-
-                prev_value = value;
             }
         }
 
@@ -394,20 +390,28 @@ impl Channels {
     }
 
     pub fn get_max_i_pos(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) {
-        let max = ElectricCurrent::new::<ampere>(3.0);
-        let duty = self.get_pwm(channel, PwmPin::MaxIPos);
-        (duty * max, MAX_TEC_I)
+        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)
     }
 
     pub fn get_max_i_neg(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) {
-        let max = ElectricCurrent::new::<ampere>(3.0);
-        let duty = self.get_pwm(channel, PwmPin::MaxINeg);
-        (duty * max, MAX_TEC_I)
+        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)
     }
 
     // Get current passing through TEC
     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
@@ -451,16 +455,35 @@ impl Channels {
 
     pub fn set_max_i_pos(&mut self, channel: usize, max_i_pos: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) {
         let max = ElectricCurrent::new::<ampere>(3.0);
-        let duty = (max_i_pos.min(MAX_TEC_I).max(ElectricCurrent::zero()) / max).get::<ratio>();
-        let duty = self.set_pwm(channel, PwmPin::MaxIPos, duty);
-        (duty * max, max)
+        let duty = (max_i_pos.min(MAX_TEC_I).max(ElectricCurrent::zero()) / MAX_TEC_I_DUTY_TO_CURRENT_RATE).get::<ratio>();
+        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)
     }
 
     pub fn set_max_i_neg(&mut self, channel: usize, max_i_neg: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) {
         let max = ElectricCurrent::new::<ampere>(3.0);
-        let duty = (max_i_neg.min(MAX_TEC_I).max(ElectricCurrent::zero()) / max).get::<ratio>();
-        let duty = self.set_pwm(channel, PwmPin::MaxINeg, duty);
-        (duty * max, max)
+        let duty = (max_i_neg.min(MAX_TEC_I).max(ElectricCurrent::zero()) / MAX_TEC_I_DUTY_TO_CURRENT_RATE).get::<ratio>();
+        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)
+    }
+
+    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 {
@@ -522,6 +545,7 @@ impl Channels {
             max_v: self.get_max_v(channel).into(),
             max_i_pos: self.get_max_i_pos(channel).into(),
             max_i_neg: self.get_max_i_neg(channel).into(),
+            polarity: PolarityJson(self.channel_state(channel).polarity.clone()),
         }
     }
 
@@ -603,6 +627,21 @@ impl Serialize for CenterPointJson {
     }
 }
 
+pub struct PolarityJson(Polarity);
+
+// used in JSON encoding, not for config
+impl Serialize for PolarityJson {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(match self.0 {
+            Polarity::Normal => "normal",
+            Polarity::Reversed => "reversed",
+        })
+    }
+}
+
 #[derive(Serialize)]
 pub struct PwmSummaryField<T: Serialize> {
     value: T,
@@ -623,6 +662,7 @@ pub struct PwmSummary {
     max_v: PwmSummaryField<ElectricPotential>,
     max_i_pos: PwmSummaryField<ElectricCurrent>,
     max_i_neg: PwmSummaryField<ElectricCurrent>,
+    polarity: PolarityJson,
 }
 
 #[derive(Serialize)]

src/command_handler.rs

@@ -11,7 +11,8 @@ use super::{
         CenterPoint, 
         PidParameter, 
         PwmPin, 
-        ShParameter
+        ShParameter,
+        Polarity
     },
     ad7172,
     CHANNEL_CONFIG_KEY,
@@ -22,7 +23,6 @@ use super::{
     config::ChannelConfig,
     dfu,
     flash_store::FlashStore,
-    session::Session,
     FanCtrl,
     hw_rev::HWRev,
 };
@@ -87,16 +87,6 @@ fn send_line(socket: &mut TcpSocket, data: &[u8]) -> bool {
 
 impl Handler {
 
-    fn reporting(socket: &mut TcpSocket) -> Result<Handler, Error> {
-        send_line(socket, b"{}");
-        Ok(Handler::Handled)
-    }
-
-    fn show_report_mode(socket: &mut TcpSocket, session: &Session) -> Result<Handler, Error> {
-        let _ = writeln!(socket, "{{ \"report\": {:?} }}", session.reporting());
-        Ok(Handler::Handled)
-    }
-
     fn show_report(socket: &mut TcpSocket, channels: &mut Channels) -> Result<Handler, Error> {
         match channels.reports_json() {
             Ok(buf) => {
@@ -181,6 +171,12 @@ impl Handler {
         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> {
         match pin {
             PwmPin::ISet => {
@@ -412,11 +408,9 @@ impl Handler {
         }
     }
 
-    pub fn handle_command(command: Command, socket: &mut TcpSocket, channels: &mut Channels, session: &Session, store: &mut FlashStore, ipv4_config: &mut Ipv4Config, fan_ctrl: &mut FanCtrl, hwrev: HWRev) -> Result<Self, Error> {
+    pub fn handle_command(command: Command, socket: &mut TcpSocket, channels: &mut Channels, store: &mut FlashStore, ipv4_config: &mut Ipv4Config, fan_ctrl: &mut FanCtrl, hwrev: HWRev) -> Result<Self, Error> {
         match command {
             Command::Quit => Ok(Handler::CloseSocket),
-            Command::Reporting(_reporting) => Handler::reporting(socket),            
-            Command::Show(ShowCommand::Reporting) => Handler::show_report_mode(socket, session),            
             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),
@@ -424,6 +418,7 @@ impl Handler {
             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::PwmPolarity { channel, polarity } => Handler::set_polarity(socket, channels, channel, polarity),
             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::Pid { channel, parameter, value } => Handler::set_pid(socket, channels, channel, parameter, value),

src/command_parser.rs

@@ -96,7 +96,6 @@ pub struct Ipv4Config {
 #[derive(Debug, Clone, PartialEq)]
 pub enum ShowCommand {
     Input,
-    Reporting,
     Pwm,
     Pid,
     SteinhartHart,
@@ -136,6 +135,12 @@ pub enum CenterPoint {
     Override(f32),
 }
 
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum Polarity {
+    Normal,
+    Reversed,
+}
+
 #[derive(Debug, Clone, PartialEq)]
 pub enum Command {
     Quit,
@@ -148,7 +153,6 @@ pub enum Command {
     Reset,
     Ipv4(Ipv4Config),
     Show(ShowCommand),
-    Reporting(bool),
     /// PWM parameter setting
     Pwm {
         channel: usize,
@@ -159,6 +163,10 @@ pub enum Command {
     PwmPid {
         channel: usize,
     },
+    PwmPolarity {
+        channel: usize,
+        polarity: Polarity,
+    },
     CenterPoint {
         channel: usize,
         center: CenterPoint,
@@ -233,12 +241,6 @@ fn float(input: &[u8]) -> IResult<&[u8], Result<f64, Error>> {
     Ok((input, result))
 }
 
-fn off_on(input: &[u8]) -> IResult<&[u8], bool> {
-    alt((value(false, tag("off")),
-         value(true, tag("on"))
-    ))(input)
-}
-
 fn channel(input: &[u8]) -> IResult<&[u8], usize> {
     map(one_of("01"), |c| (c as usize) - ('0' as usize))(input)
 }
@@ -246,24 +248,8 @@ fn channel(input: &[u8]) -> IResult<&[u8], usize> {
 fn report(input: &[u8]) -> IResult<&[u8], Command> {
     preceded(
         tag("report"),
-        alt((
-            preceded(
-                whitespace,
-                preceded(
-                    tag("mode"),
-                    alt((
-                        preceded(
-                            whitespace,
-                            // `report mode <on | off>` - Switch repoting mode
-                            map(off_on, Command::Reporting)
-                        ),
-                        // `report mode` - Show current reporting state
-                        value(Command::Show(ShowCommand::Reporting), end)
-                    ))
-                )),
-            // `report` - Report once
-            value(Command::Show(ShowCommand::Input), end)
-        ))
+        // `report` - Report once
+        value(Command::Show(ShowCommand::Input), end)
     )(input)
 }
 
@@ -321,6 +307,18 @@ fn pwm_pid(input: &[u8]) -> IResult<&[u8], ()> {
     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>> {
     let (input, _) = tag("pwm")(input)?;
     alt((
@@ -333,6 +331,10 @@ fn pwm(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
                     let (input, ()) = pwm_pid(input)?;
                     Ok((input, Ok(Command::PwmPid { channel })))
                 },
+                |input| {
+                    let (input, polarity) = pwm_polarity(input)?;
+                    Ok((input, Ok(Command::PwmPolarity { channel, polarity })))
+                },
                 |input| {
                     let (input, config) = pwm_setup(input)?;
                     match config {
@@ -682,24 +684,6 @@ mod test {
         assert_eq!(command, Ok(Command::Show(ShowCommand::Input)));
     }
 
-    #[test]
-    fn parse_report_mode() {
-        let command = Command::parse(b"report mode");
-        assert_eq!(command, Ok(Command::Show(ShowCommand::Reporting)));
-    }
-
-    #[test]
-    fn parse_report_mode_on() {
-        let command = Command::parse(b"report mode on");
-        assert_eq!(command, Ok(Command::Reporting(true)));
-    }
-
-    #[test]
-    fn parse_report_mode_off() {
-        let command = Command::parse(b"report mode off");
-        assert_eq!(command, Ok(Command::Reporting(false)));
-    }
-
     #[test]
     fn parse_pwm_i_set() {
         let command = Command::parse(b"pwm 1 i_set 16383");

src/config.rs

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

src/main.rs

@@ -180,10 +180,7 @@ fn main() -> ! {
             loop {
                 let mut new_ipv4_config = None;
                 let instant = Instant::from_millis(i64::from(timer::now()));
-                let updated_channel = channels.poll_adc(instant);
-                if let Some(channel) = updated_channel {
-                    server.for_each(|_, session| session.set_report_pending(channel.into()));
-                }
+                channels.poll_adc(instant);
 
                 fan_ctrl.cycle(channels.current_abs_max_tec_i());
 
@@ -216,7 +213,7 @@ fn main() -> ! {
                                 // Do nothing and feed more data to the line reader in the next loop cycle.
                                 Ok(SessionInput::Nothing) => {}
                                 Ok(SessionInput::Command(command)) => {
-                                    match Handler::handle_command(command, &mut socket, &mut channels, session, &mut store, &mut ipv4_config, &mut fan_ctrl, hwrev) {
+                                    match Handler::handle_command(command, &mut socket, &mut channels, &mut store, &mut ipv4_config, &mut fan_ctrl, hwrev) {
                                         Ok(Handler::NewIPV4(ip)) => new_ipv4_config = Some(ip),                                
                                         Ok(Handler::Handled) => {},
                                         Ok(Handler::CloseSocket) => socket.close(),
@@ -231,19 +228,6 @@ fn main() -> ! {
                                 Err(_) =>
                                     socket.close(),
                             }
-                        } else if socket.can_send() {
-                            if let Some(channel) = session.is_report_pending() {
-                                match channels.reports_json() {
-                                    Ok(buf) => {
-                                        send_line(&mut socket, &buf[..]);
-                                        session.mark_report_sent(channel);
-                                    }
-                                    Err(e) => {
-                                        error!("unable to serialize report: {:?}", e);
-
-                                    }
-                                }
-                            }
                         }
                     });
                 } else {

src/session.rs

@@ -1,5 +1,4 @@
 use super::command_parser::{Command, Error as ParserError};
-use super::channels::CHANNELS;
 
 const MAX_LINE_LEN: usize = 64;
 
@@ -53,8 +52,6 @@ impl From<Result<Command, ParserError>> for SessionInput {
 
 pub struct Session {
     reader: LineReader,
-    reporting: bool,
-    report_pending: [bool; CHANNELS],
 }
 
 impl Default for Session {
@@ -67,43 +64,11 @@ impl Session {
     pub fn new() -> Self {
         Session {
             reader: LineReader::new(),
-            reporting: false,
-            report_pending: [false; CHANNELS],
         }
     }
 
     pub fn reset(&mut self) {
         self.reader = LineReader::new();
-        self.reporting = false;
-        self.report_pending = [false; CHANNELS];
-    }
-
-    pub fn reporting(&self) -> bool {
-        self.reporting
-    }
-
-    pub fn set_report_pending(&mut self, channel: usize) {
-        if self.reporting {
-            self.report_pending[channel] = true;
-        }
-    }
-
-    pub fn is_report_pending(&self) -> Option<usize> {
-        if ! self.reporting {
-            None
-        } else {
-            self.report_pending.iter()
-                .enumerate()
-                .fold(None, |result, (channel, report_pending)| {
-                    result.or_else(|| {
-                        if *report_pending { Some(channel) } else { None }
-                    })
-                })
-        }
-    }
-
-    pub fn mark_report_sent(&mut self, channel: usize) {
-        self.report_pending[channel] = false;
     }
 
     pub fn feed(&mut self, buf: &[u8]) -> (usize, SessionInput) {
@@ -114,12 +79,6 @@ impl Session {
             match line {
                 Some(line) => {
                     let command = Command::parse(&line);
-                    match command {
-                        Ok(Command::Reporting(reporting)) => {
-                            self.reporting = reporting;
-                        }
-                        _ => {}
-                    }
                     return (buf_bytes, command.into());
                 }
                 None => {}