README.md

@@ -95,7 +95,7 @@ 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                                                      |
@@ -124,6 +124,7 @@ formatted as line-delimited JSON.
 | `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 0 to 100, where 0 is auto mode (TODO) |
 
 

flake.nix

@@ -69,7 +69,7 @@
         buildInputs = with pkgs; [
           rustPlatform.rust.rustc
           rustPlatform.rust.cargo
-          openocd dfu-util
+          openocd dfu-util gcc-arm-embedded-10
           ] ++ (with python3Packages; [
             numpy matplotlib
           ]);

src/channels.rs

@@ -1,3 +1,4 @@
+use core::cmp::max_by;
 use heapless::{consts::{U2, U1024}, Vec};
 use serde::{Serialize, Serializer};
 use smoltcp::time::Instant;
@@ -82,6 +83,10 @@ impl Channels {
         }
     }
 
+    pub fn fan_available(&self) -> bool {
+        self.hw_rev.major == 2 && self.hw_rev.minor == 2
+    }
+
     pub fn channel_state<I: Into<usize>>(&mut self, channel: I) -> &mut ChannelState {
         match channel.into() {
             0 => &mut self.channel0.state,
@@ -461,7 +466,7 @@ impl Channels {
         (self.get_pwm(0, PwmPin::Fan) * 100.0) as u32
     }
 
-    fn report(&mut self, channel: usize, tacho: Option<u32>) -> Report {
+    fn report(&mut self, channel: usize) -> Report {
         let vref = self.channel_state(channel).vref;
         let i_set = self.get_i(channel);
         let i_tec = self.read_itec(channel);
@@ -486,15 +491,14 @@ impl Channels {
             tec_i,
             tec_u_meas: self.get_tec_v(channel),
             pid_output,
-            tacho,
             hwrev: self.hw_rev
         }
     }
 
-    pub fn reports_json(&mut self, tacho: Option<u32>) -> Result<JsonBuffer, serde_json_core::ser::Error> {
+    pub fn reports_json(&mut self) -> Result<JsonBuffer, serde_json_core::ser::Error> {
         let mut reports = Vec::<_, U2>::new();
         for channel in 0..CHANNELS {
-            let _ = reports.push(self.report(channel, tacho));
+            let _ = reports.push(self.report(channel));
         }
         serde_json_core::to_vec(&reports)
     }
@@ -515,7 +519,6 @@ impl Channels {
             max_v: (self.get_max_v(channel), ElectricPotential::new::<volt>(5.0)).into(),
             max_i_pos: self.get_max_i_pos(channel).into(),
             max_i_neg: self.get_max_i_neg(channel).into(),
-            fan: self.get_fan_pwm(),
         }
     }
 
@@ -553,6 +556,20 @@ impl Channels {
         }
         serde_json_core::to_vec(&summaries)
     }
+
+    pub fn fan_summary(&mut self, tacho: Option<u32>) -> Result<JsonBuffer, serde_json_core::ser::Error> {
+        if self.fan_available() {
+            let summary = FanSummary {
+                fan_pwm: self.get_fan_pwm(),
+                tacho: tacho.unwrap_or(u32::MAX),
+                abs_max_tec_i: max_by(self.get_tec_i(0).abs().value, self.get_tec_i(1).abs().value, |a, b| a.partial_cmp(b).unwrap())
+            };
+            serde_json_core::to_vec(&summary)
+        } else {
+            let summary: Option<()> = None;
+            serde_json_core::to_vec(&summary)
+        }
+    }
 }
 
 type JsonBuffer = Vec<u8, U1024>;
@@ -574,7 +591,6 @@ pub struct Report {
     tec_i: ElectricCurrent,
     tec_u_meas: ElectricPotential,
     pid_output: ElectricCurrent,
-    tacho: Option<u32>,
     hwrev: HWRev,
 }
 
@@ -615,7 +631,6 @@ pub struct PwmSummary {
     max_v: PwmSummaryField<ElectricPotential>,
     max_i_pos: PwmSummaryField<ElectricCurrent>,
     max_i_neg: PwmSummaryField<ElectricCurrent>,
-    fan: u32,
 }
 
 #[derive(Serialize)]
@@ -629,3 +644,10 @@ pub struct SteinhartHartSummary {
     channel: usize,
     params: steinhart_hart::Parameters,
 }
+
+#[derive(Serialize)]
+pub struct FanSummary {
+    fan_pwm: u32,
+    tacho: u32,
+    abs_max_tec_i: f64,
+}

src/command_handler.rs

@@ -93,8 +93,8 @@ impl Handler {
         Ok(Handler::Handled)
     }
 
-    fn show_report(socket: &mut TcpSocket, channels: &mut Channels, tacho: Option<u32>) -> Result<Handler, Error> {
-        match channels.reports_json(tacho) {
+    fn show_report(socket: &mut TcpSocket, channels: &mut Channels) -> Result<Handler, Error> {
+        match channels.reports_json() {
             Ok(buf) => {
                 send_line(socket, &buf[..]);
             }
@@ -344,14 +344,24 @@ impl Handler {
         Ok(Handler::Reset)
     }
 
-    fn fan (channels: &mut Channels, fan_pwm: Option<u32>) -> Result<Handler, Error> {
+    fn fan (socket: &mut TcpSocket, channels: &mut Channels, fan_pwm: Option<u32>, tacho_value: Option<u32>) -> Result<Handler, Error> {
         match fan_pwm {
             Some(val) => {
                 channels.set_fan_pwm(val);
                 Ok(Handler::Handled)
             },
             None => {
-                Err(Error::ReportError)
+                match channels.fan_summary(tacho_value) {
+                    Ok(buf) => {
+                        send_line(socket, &buf);
+                    }
+                    Err(e) => {
+                        error!("unable to serialize fan summary: {:?}", e);
+                        let _ = writeln!(socket, "{{\"error\":\"{:?}\"}}", e);
+                        return Err(Error::ReportError);
+                    }
+                };
+                Ok(Handler::Handled)
             }
         }
     }
@@ -361,7 +371,7 @@ impl Handler {
             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, tacho_value),
+            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::SteinhartHart) => Handler::show_steinhart_hart(socket, channels),            
@@ -379,7 +389,7 @@ impl Handler {
             Command::Ipv4(config) => Handler::set_ipv4(socket, store, config),
             Command::Reset => Handler::reset(channels),
             Command::Dfu => Handler::dfu(channels),
-            Command::Fan {fan_pwm} => Handler::fan(channels, fan_pwm)
+            Command::Fan {fan_pwm} => Handler::fan(socket, channels, fan_pwm, tacho_value)
         }
     }
 }

src/main.rs

@@ -152,7 +152,7 @@ fn main() -> ! {
         }
     }
 
-    let fan_available = channels.hw_rev.major == 2 && channels.hw_rev.minor == 2;
+    let fan_available = channels.fan_available();
 
     // default net config:
     let mut ipv4_config = Ipv4Config {
@@ -206,12 +206,9 @@ fn main() -> ! {
                 let instant = Instant::from_millis(i64::from(timer::now()));
 
                 if fan_available {
-                    let mut tacho_input = false;
-                    cortex_m::interrupt::free(|_cs| {
-                        tacho_input = tacho.check_interrupt();
-                        tacho.clear_interrupt_pending_bit();
-                    });
+                    let tacho_input = tacho.check_interrupt();
                     if tacho_input {
+                        tacho.clear_interrupt_pending_bit();
                         tacho_cnt += 1;
                     }
 
@@ -262,7 +259,7 @@ fn main() -> ! {
                             }
                         } else if socket.can_send() {
                             if let Some(channel) = session.is_report_pending() {
-                                match channels.reports_json(tacho_value) {
+                                match channels.reports_json() {
                                     Ok(buf) => {
                                         send_line(&mut socket, &buf[..]);
                                         session.mark_report_sent(channel);