README.md

@@ -129,6 +129,7 @@ formatted as line-delimited JSON.
 | `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                                                        |
 
 
 ## USB

src/channels.rs

@@ -1,5 +1,5 @@
 use core::cmp::max_by;
-use heapless::{consts::{U2, U1024}, Vec};
+use heapless::{consts::U2, Vec};
 use serde::{Serialize, Serializer};
 use smoltcp::time::Instant;
 use stm32f4xx_hal::hal;
@@ -17,9 +17,9 @@ use crate::{
     channel::{Channel, Channel0, Channel1},
     channel_state::ChannelState,
     command_parser::{CenterPoint, PwmPin},
+    command_handler::JsonBuffer,
     pins,
     steinhart_hart,
-    fan_ctrl::HWRev,
 };
 
 pub const CHANNELS: usize = 2;
@@ -35,7 +35,6 @@ pub struct Channels {
     /// stm32f4 integrated adc
     pins_adc: pins::PinsAdc,
     pub pwm: pins::PwmPins,
-    pub hwrev: HWRev,
 }
 
 impl Channels {
@@ -57,8 +56,7 @@ impl Channels {
         let channel1 = Channel::new(pins.channel1, adc_calibration1);
         let pins_adc = pins.pins_adc;
         let pwm = pins.pwm;
-        let mut channels = Channels { channel0, channel1, adc, pins_adc, pwm,
+        let mut channels = Channels { channel0, channel1, adc, pins_adc, pwm };
-            hwrev: HWRev::detect_hw_rev(&pins.hwrev)};
         for channel in 0..CHANNELS {
             channels.channel_state(channel).vref = channels.read_vref(channel);
             channels.calibrate_dac_value(channel);
@@ -458,7 +456,6 @@ impl Channels {
             tec_i,
             tec_u_meas: self.get_tec_v(channel),
             pid_output,
-            hwrev: self.hwrev
         }
     }
 
@@ -531,8 +528,6 @@ impl Channels {
     }
 }
 
-pub type JsonBuffer = Vec<u8, U1024>;
-
 #[derive(Serialize)]
 pub struct Report {
     channel: usize,
@@ -550,7 +545,6 @@ pub struct Report {
     tec_i: ElectricCurrent,
     tec_u_meas: ElectricPotential,
     pid_output: ElectricCurrent,
-    hwrev: HWRev,
 }
 
 pub struct CenterPointJson(CenterPoint);

src/command_handler.rs

@@ -1,6 +1,7 @@
 use smoltcp::socket::TcpSocket;
 use log::{error, warn};
 use core::fmt::Write;
+use heapless::{consts::U1024, Vec};
 use super::{
     net,
     command_parser::{
@@ -24,6 +25,7 @@ use super::{
     flash_store::FlashStore,
     session::Session,
     FanCtrl,
+    hw_rev::HWRev,
 };
 
 use uom::{
@@ -56,6 +58,8 @@ pub enum Error {
     FlashError
 }
 
+pub type JsonBuffer = Vec<u8, U1024>;
+
 fn send_line(socket: &mut TcpSocket, data: &[u8]) -> bool {
     let send_free = socket.send_capacity() - socket.send_queue();
     if data.len() > send_free + 1 {
@@ -345,7 +349,11 @@ impl Handler {
     fn set_fan(socket: &mut TcpSocket, fan_pwm: u32, fan_ctrl: &mut FanCtrl) -> Result<Handler, Error> {
         fan_ctrl.set_auto_mode(false);
         fan_ctrl.set_pwm(fan_pwm);
-        send_line(socket, b"{}");
+        if fan_ctrl.is_default_auto() {
+            send_line(socket, b"{}");
+        } else {
+            send_line(socket, b"{ \"warning\": \"this fan doesn't have full PWM support. Use it on your own risk!\" }");
+        }
         Ok(Handler::Handled)
     }
 
@@ -365,11 +373,15 @@ impl Handler {
 
     fn fan_auto(socket: &mut TcpSocket, fan_ctrl: &mut FanCtrl) -> Result<Handler, Error> {
         fan_ctrl.set_auto_mode(true);
-        send_line(socket, b"{}");
+        if fan_ctrl.is_default_auto() {
+            send_line(socket, b"{}");
+        } else {
+            send_line(socket, b"{ \"warning\": \"this fan doesn't have full PWM support. Use it on your own risk!\" }");
+        }
         Ok(Handler::Handled)
     }
 
-    fn fan_curve(socket: &mut TcpSocket, fan_ctrl: &mut FanCtrl, k_a: f64, k_b: f64, k_c: f64) -> Result<Handler, Error> {
+    fn fan_curve(socket: &mut TcpSocket, fan_ctrl: &mut FanCtrl, k_a: f32, k_b: f32, k_c: f32) -> Result<Handler, Error> {
         fan_ctrl.set_curve(k_a, k_b, k_c);
         send_line(socket, b"{}");
         Ok(Handler::Handled)
@@ -381,7 +393,21 @@ impl Handler {
         Ok(Handler::Handled)
     }
 
-    pub fn handle_command(command: Command, socket: &mut TcpSocket, channels: &mut Channels, session: &Session, leds: &mut Leds, store: &mut FlashStore, ipv4_config: &mut Ipv4Config, fan_ctrl: &mut FanCtrl) -> Result<Self, Error> {
+    fn show_hwrev(socket: &mut TcpSocket, hwrev: HWRev) -> Result<Handler, Error> {
+        match hwrev.summary() {
+            Ok(buf) => {
+                send_line(socket, &buf);
+                Ok(Handler::Handled)
+            }
+            Err(e) => {
+                error!("unable to serialize HWRev summary: {:?}", e);
+                let _ = writeln!(socket, "{{\"error\":\"{:?}\"}}", e);
+                Err(Error::ReportError)
+            }
+        }
+    }
+
+    pub fn handle_command(command: Command, socket: &mut TcpSocket, channels: &mut Channels, session: &Session, leds: &mut Leds, 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),            
@@ -409,6 +435,7 @@ impl Handler {
             Command::FanAuto => Handler::fan_auto(socket, fan_ctrl),
             Command::FanCurve { k_a, k_b, k_c } => Handler::fan_curve(socket, fan_ctrl, k_a, k_b, k_c),
             Command::FanCurveDefaults => Handler::fan_defaults(socket, fan_ctrl),
+            Command::ShowHWRev => Handler::show_hwrev(socket, hwrev),
         }
     }
 }

src/command_parser.rs

@@ -185,11 +185,12 @@ pub enum Command {
     FanAuto,
     ShowFan,
     FanCurve {
-        k_a: f64,
+        k_a: f32,
-        k_b: f64,
+        k_b: f32,
-        k_c: f64,
+        k_c: f32,
     },
     FanCurveDefaults,
+    ShowHWRev,
 }
 
 fn end(input: &[u8]) -> IResult<&[u8], ()> {
@@ -573,7 +574,7 @@ fn fan_curve(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
                     let (input, k_c) = float(input)?;
                     let (input, _) = end(input)?;
                     if k_a.is_ok() && k_b.is_ok() && k_c.is_ok() {
-                        Ok((input, Ok(Command::FanCurve { k_a: k_a.unwrap(), k_b: k_b.unwrap(), k_c: k_c.unwrap() })))
+                        Ok((input, Ok(Command::FanCurve { k_a: k_a.unwrap() as f32, k_b: k_b.unwrap() as f32, k_c: k_c.unwrap() as f32 })))
                     } else {
                         Err(nom::Err::Incomplete(Needed::Size(3)))
                     }
@@ -601,6 +602,7 @@ fn command(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
          value(Ok(Command::Dfu), tag("dfu")),
          fan,
          fan_curve,
+         value(Ok(Command::ShowHWRev), tag("hwrev")),
     ))(input)
 }
 
@@ -856,4 +858,10 @@ mod test {
         let command = Command::parse(b"fcurve default");
         assert_eq!(command, Ok(Command::FanCurveDefaults));
     }
+
+    #[test]
+    fn parse_hwrev() {
+        let command = Command::parse(b"hwrev");
+        assert_eq!(command, Ok(Command::ShowHWRev));
+    }
 }

src/fan_ctrl.rs

@@ -6,65 +6,62 @@ use stm32f4xx_hal::{
 };
 
 use crate::{
-    pins::HWRevPins,
+    hw_rev::HWRev,
-    channels::JsonBuffer,
+    command_handler::JsonBuffer,
 };
 
 pub type FanPin = PwmChannels<TIM8, pwm::C4>;
 
 // as stated in the schematics
-const MAX_TEC_I: f64 = 3.0;
+const MAX_TEC_I: f32 = 3.0;
 
-const MAX_USER_FAN_PWM: f64 = 100.0;
+const MAX_USER_FAN_PWM: f32 = 100.0;
-const MIN_USER_FAN_PWM: f64 = 1.0;
+const MIN_USER_FAN_PWM: f32 = 1.0;
-const MAX_FAN_PWM: f64 = 1.0;
+const MAX_FAN_PWM: f32 = 1.0;
 // below this value motor's autostart feature may fail
-const MIN_FAN_PWM: f64 = 0.04;
+const MIN_FAN_PWM: f32 = 0.04;
 
-const DEFAULT_K_A: f64 = 1.0;
+const DEFAULT_K_A: f32 = 1.0;
-const DEFAULT_K_B: f64 = 0.0;
+const DEFAULT_K_B: f32 = 0.0;
-const DEFAULT_K_C: f64 = 0.0;
+const DEFAULT_K_C: f32 = 0.0;
-
-
-#[derive(Serialize, Copy, Clone)]
-pub struct HWRev {
-    pub major: u8,
-    pub minor: u8,
-}
 
 pub struct FanCtrl {
     fan: FanPin,
     fan_auto: bool,
     available: bool,
-    k_a: f64,
+    default_auto: bool,
-    k_b: f64,
+    pwm_enabled: bool,
-    k_c: f64,
+    k_a: f32,
-    abs_max_tec_i: f64,
+    k_b: f32,
+    k_c: f32,
+    abs_max_tec_i: f32,
 }
 
 impl FanCtrl {
-    pub fn new(mut fan: FanPin, hwrev: &HWRev) -> Self {
+    pub fn new(fan: FanPin, hwrev: HWRev) -> Self {
         let available = hwrev.fan_available();
+        let default_auto = hwrev.fan_default_auto();
 
-        if available {
+        let mut fan_ctrl = FanCtrl {
-            fan.set_duty(0);
-            fan.enable();
-        }
-
-        FanCtrl {
             fan,
             available,
             // do not enable auto mode by default,
-            // but allow to turn it on on customer's own risk
+            // but allow to turn it on on user's own risk
-            fan_auto: hwrev.fan_auto_mode_available(),
+            default_auto,
+            fan_auto: default_auto,
+            pwm_enabled: false,
             k_a: DEFAULT_K_A,
             k_b: DEFAULT_K_B,
             k_c: DEFAULT_K_C,
-            abs_max_tec_i: 0f64,
+            abs_max_tec_i: 0f32,
+        };
+        if fan_ctrl.fan_auto {
+            fan_ctrl.enable_pwm();
         }
+        fan_ctrl
     }
 
-    pub fn cycle(&mut self, abs_max_tec_i: f64) {
+    pub fn cycle(&mut self, abs_max_tec_i: f32) {
         self.abs_max_tec_i = abs_max_tec_i;
         self.adjust_speed();
     }
@@ -99,7 +96,7 @@ impl FanCtrl {
         self.fan_auto = fan_auto;
     }
 
-    pub fn set_curve(&mut self, k_a: f64, k_b: f64, k_c: f64) {
+    pub fn set_curve(&mut self, k_a: f32, k_b: f32, k_c: f32) {
         self.k_a = k_a;
         self.k_b = k_b;
         self.k_c = k_c;
@@ -109,55 +106,47 @@ impl FanCtrl {
         self.set_curve(DEFAULT_K_A, DEFAULT_K_B, DEFAULT_K_C);
     }
 
-    pub fn set_pwm(&mut self, fan_pwm: u32) -> f64 {
+    pub fn set_pwm(&mut self, fan_pwm: u32) -> f32 {
+        if !self.pwm_enabled {
+            self.enable_pwm()
+        }
         let fan_pwm = fan_pwm.min(MAX_USER_FAN_PWM as u32).max(MIN_USER_FAN_PWM as u32);
-        let duty = Self::scale_number(fan_pwm as f64, MIN_FAN_PWM, MAX_FAN_PWM, MIN_USER_FAN_PWM, MAX_USER_FAN_PWM);
+        let duty = Self::scale_number(fan_pwm as f32, MIN_FAN_PWM, MAX_FAN_PWM, MIN_USER_FAN_PWM, MAX_USER_FAN_PWM);
         let max = self.fan.get_max_duty();
-        let value = ((duty * (max as f64)) as u16).min(max);
+        let value = ((duty * (max as f32)) as u16).min(max);
         self.fan.set_duty(value);
-        value as f64 / (max as f64)
+        value as f32 / (max as f32)
     }
 
-    fn scale_number(unscaled: f64, to_min: f64, to_max: f64, from_min: f64, from_max: f64) -> f64 {
+    pub fn is_default_auto(&self) -> bool {
+        self.default_auto
+    }
+
+    fn scale_number(unscaled: f32, to_min: f32, to_max: f32, from_min: f32, from_max: f32) -> f32 {
         (to_max - to_min) * (unscaled - from_min) / (from_max - from_min) + to_min
     }
 
     fn get_pwm(&self) -> u32 {
         let duty = self.fan.get_duty();
         let max = self.fan.get_max_duty();
-        Self::scale_number(duty as f64 / (max as f64), MIN_USER_FAN_PWM, MAX_USER_FAN_PWM, MIN_FAN_PWM, MAX_FAN_PWM).round() as u32
+        Self::scale_number(duty as f32 / (max as f32), MIN_USER_FAN_PWM, MAX_USER_FAN_PWM, MIN_FAN_PWM, MAX_FAN_PWM).round() as u32
     }
-}
 
-impl HWRev {
+    fn enable_pwm(&mut self) {
-    pub fn detect_hw_rev(hwrev_pins: &HWRevPins) -> Self {
+        if self.available {
-        let (h0, h1, h2, h3) = (hwrev_pins.hwrev0.is_high(), hwrev_pins.hwrev1.is_high(),
+            self.fan.set_duty(0);
-                                hwrev_pins.hwrev2.is_high(), hwrev_pins.hwrev3.is_high());
+            self.fan.enable();
-        match (h0, h1, h2, h3) {
+            self.pwm_enabled = true;
-            (true, true, true, false) => HWRev { major: 1, minor: 0 },
-            (true, false, false, false) => HWRev { major: 2, minor: 0 },
-            (false, true, false, false) => HWRev { major: 2, minor: 2 },
-            (_, _, _, _) => HWRev { major: 0, minor: 0 }
         }
     }
-
-    pub fn fan_available(&self) -> bool {
-        self.major == 2 && self.minor == 2
-    }
-
-    pub fn fan_auto_mode_available(&self) -> bool {
-        // see https://github.com/sinara-hw/Thermostat/issues/115 and
-        // https://git.m-labs.hk/M-Labs/thermostat/issues/69#issuecomment-6464 for explanation
-        self.fan_available() && self.minor != 2
-    }
 }
 
 #[derive(Serialize)]
 pub struct FanSummary {
     fan_pwm: u32,
-    abs_max_tec_i: f64,
+    abs_max_tec_i: f32,
     auto_mode: bool,
-    k_a: f64,
+    k_a: f32,
-    k_b: f64,
+    k_b: f32,
-    k_c: f64,
+    k_c: f32,
 }

src/hw_rev.rs

@@ -0,0 +1,41 @@
+use serde::Serialize;
+
+use crate::{
+    pins::HWRevPins,
+    command_handler::JsonBuffer
+};
+
+#[derive(Serialize, Copy, Clone)]
+pub struct HWRev {
+    pub major: u8,
+    pub minor: u8,
+}
+
+
+impl HWRev {
+    pub fn detect_hw_rev(hwrev_pins: &HWRevPins) -> Self {
+        let (h0, h1, h2, h3) = (hwrev_pins.hwrev0.is_high(), hwrev_pins.hwrev1.is_high(),
+                                hwrev_pins.hwrev2.is_high(), hwrev_pins.hwrev3.is_high());
+        match (h0, h1, h2, h3) {
+            (true, true, true, false) => HWRev { major: 1, minor: 0 },
+            (true, false, false, false) => HWRev { major: 2, minor: 0 },
+            (false, true, false, false) => HWRev { major: 2, minor: 2 },
+            (_, _, _, _) => HWRev { major: 0, minor: 0 }
+        }
+    }
+
+    pub fn fan_available(&self) -> bool {
+        self.major == 2 && self.minor == 2
+    }
+
+    pub fn fan_default_auto(&self) -> bool {
+        // see https://github.com/sinara-hw/Thermostat/issues/115 and
+        // https://git.m-labs.hk/M-Labs/thermostat/issues/69#issuecomment-6464 for explanation
+        self.fan_available() && self.minor != 2
+    }
+
+    pub fn summary(&self) -> Result<JsonBuffer, serde_json_core::ser::Error> {
+        serde_json_core::to_vec(&self)
+
+    }
+}

src/main.rs

@@ -55,6 +55,8 @@ mod command_handler;
 use command_handler::Handler;
 mod fan_ctrl;
 use fan_ctrl::FanCtrl;
+mod hw_rev;
+use hw_rev::HWRev;
 
 const HSE: MegaHertz = MegaHertz(8);
 #[cfg(not(feature = "semihosting"))]
@@ -138,6 +140,8 @@ fn main() -> ! {
 
     let mut store = flash_store::store(dp.FLASH);
 
+    let hwrev = HWRev::detect_hw_rev(&pins.hwrev);
+
     let mut channels = Channels::new(pins);
     for c in 0..CHANNELS {
         match store.read_value::<ChannelConfig>(CHANNEL_CONFIG_KEY[c]) {
@@ -150,7 +154,7 @@ fn main() -> ! {
         }
     }
 
-    let mut fan_ctrl = FanCtrl::new(fan, &channels.hwrev);
+    let mut fan_ctrl = FanCtrl::new(fan, hwrev);
 
     // default net config:
     let mut ipv4_config = Ipv4Config {
@@ -185,7 +189,7 @@ fn main() -> ! {
                     server.for_each(|_, session| session.set_report_pending(channel.into()));
                 }
 
-                fan_ctrl.cycle(channels.current_abs_max_tec_i());
+                fan_ctrl.cycle(channels.current_abs_max_tec_i() as f32);
 
                 let instant = Instant::from_millis(i64::from(timer::now()));
                 cortex_m::interrupt::free(net::clear_pending);
@@ -210,7 +214,7 @@ 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 leds, &mut store, &mut ipv4_config, &mut fan_ctrl) {
+                                    match Handler::handle_command(command, &mut socket, &mut channels, session, &mut leds, &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(),

src/pins.rs

@@ -227,7 +227,8 @@ impl Pins {
         };
 
         // According to `SUNON DC Brushless Fan & Blower(255-E)` catalogue p.36-37
-        // Model name: MF35101V1-1000U-G99
+        // model MF35101V1-1000U-G99 doesn't have a PWM wire, so it is advised to have
+        // higher frequency to have less audible noise.
         let fan = Timer::new(tim8, &clocks).pwm(gpioc.pc9.into_alternate(), 25u32.khz());
 
         (pins, leds, eeprom, eth_pins, usb, fan)