README.md

@@ -129,7 +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                                                        |
+| `hwrev`                          | Show hardware revision, and settings related to it                            |
 
 
 ## USB

src/command_handler.rs

@@ -347,12 +347,16 @@ impl Handler {
     }
 
     fn set_fan(socket: &mut TcpSocket, fan_pwm: u32, fan_ctrl: &mut FanCtrl) -> Result<Handler, Error> {
+        if !fan_ctrl.fan_available() {
+            send_line(socket, b"{ \"warning\": \"this thermostat doesn't have fan!\" }");
+            return Ok(Handler::Handled);
+        }
         fan_ctrl.set_auto_mode(false);
         fan_ctrl.set_pwm(fan_pwm);
-        if fan_ctrl.is_default_auto() {
+        if fan_ctrl.fan_pwm_recommended() {
             send_line(socket, b"{}");
         } else {
-            send_line(socket, b"{ \"warning\": \"this fan doesn't have full PWM support. Use it on your own risk!\" }");
+            send_line(socket, b"{ \"warning\": \"this fan doesn't have full PWM support. Use it at your own risk!\" }");
         }
         Ok(Handler::Handled)
     }
@@ -372,11 +376,15 @@ impl Handler {
     }
 
     fn fan_auto(socket: &mut TcpSocket, fan_ctrl: &mut FanCtrl) -> Result<Handler, Error> {
+        if !fan_ctrl.fan_available() {
+            send_line(socket, b"{ \"warning\": \"this thermostat doesn't have fan!\" }");
+            return Ok(Handler::Handled);
+        }
         fan_ctrl.set_auto_mode(true);
-        if fan_ctrl.is_default_auto() {
+        if fan_ctrl.fan_pwm_recommended() {
             send_line(socket, b"{}");
         } else {
-            send_line(socket, b"{ \"warning\": \"this fan doesn't have full PWM support. Use it on your own risk!\" }");
+            send_line(socket, b"{ \"warning\": \"this fan doesn't have full PWM support. Use it at your own risk!\" }");
         }
         Ok(Handler::Handled)
     }

src/command_parser.rs

@@ -549,7 +549,6 @@ fn fan(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
                     Ok((input, Ok(Command::FanSet { fan_pwm: value.unwrap_or(0)})))
                 },
             ))(input)?;
-            let (input, _) = end(input)?;
             Ok((input, result))
         },
         value(Ok(Command::ShowFan), end)
@@ -572,7 +571,6 @@ fn fan_curve(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
                     let (input, k_b) = float(input)?;
                     let (input, _) = whitespace(input)?;
                     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() as f32, k_b: k_b.unwrap() as f32, k_c: k_c.unwrap() as f32 })))
                     } else {
@@ -580,7 +578,6 @@ fn fan_curve(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
                     }
                 },
             ))(input)?;
-            let (input, _) = end(input)?;
             Ok((input, result))
         },
         value(Err(Error::Incomplete), end)

src/fan_ctrl.rs

@@ -6,7 +6,7 @@ use stm32f4xx_hal::{
 };
 
 use crate::{
-    hw_rev::HWRev,
+    hw_rev::HWSettings,
     command_handler::JsonBuffer,
 };
 
@@ -17,43 +17,32 @@ const MAX_TEC_I: f32 = 3.0;
 
 const MAX_USER_FAN_PWM: f32 = 100.0;
 const MIN_USER_FAN_PWM: f32 = 1.0;
-const MAX_FAN_PWM: f32 = 1.0;
-// below this value motor's autostart feature may fail
-const MIN_FAN_PWM: f32 = 0.04;
 
-const DEFAULT_K_A: f32 = 1.0;
-const DEFAULT_K_B: f32 = 0.0;
-const DEFAULT_K_C: f32 = 0.0;
 
 pub struct FanCtrl {
-    fan: FanPin,
+    fan: Option<FanPin>,
     fan_auto: bool,
-    available: bool,
-    default_auto: bool,
     pwm_enabled: bool,
     k_a: f32,
     k_b: f32,
     k_c: f32,
     abs_max_tec_i: f32,
+    hw_settings: HWSettings,
 }
 
 impl FanCtrl {
-    pub fn new(fan: FanPin, hwrev: HWRev) -> Self {
+    pub fn new(fan: Option<FanPin>, hw_settings: HWSettings) -> Self {
-        let available = hwrev.fan_available();
-        let default_auto = hwrev.fan_default_auto();
-
         let mut fan_ctrl = FanCtrl {
             fan,
-            available,
             // do not enable auto mode by default,
-            // but allow to turn it on on user's own risk
+            // but allow to turn it at the user's own risk
-            default_auto,
+            fan_auto: hw_settings.fan_pwm_recommended,
-            fan_auto: default_auto,
             pwm_enabled: false,
-            k_a: DEFAULT_K_A,
+            k_a: hw_settings.fan_k_a,
-            k_b: DEFAULT_K_B,
+            k_b: hw_settings.fan_k_b,
-            k_c: DEFAULT_K_C,
+            k_c: hw_settings.fan_k_c,
             abs_max_tec_i: 0f32,
+            hw_settings,
         };
         if fan_ctrl.fan_auto {
             fan_ctrl.enable_pwm();
@@ -63,11 +52,16 @@ impl FanCtrl {
 
     pub fn cycle(&mut self, abs_max_tec_i: f32) {
         self.abs_max_tec_i = abs_max_tec_i;
-        self.adjust_speed();
+        if self.fan_auto && self.hw_settings.fan_available {
+            let scaled_current = self.abs_max_tec_i / MAX_TEC_I;
+            // do not limit upper bound, as it will be limited in the set_pwm()
+            let pwm = (MAX_USER_FAN_PWM * (scaled_current * (scaled_current * self.k_a + self.k_b) + self.k_c)) as u32;
+            self.set_pwm(pwm);
+        }
     }
 
     pub fn summary(&mut self) -> Result<JsonBuffer, serde_json_core::ser::Error> {
-        if self.available {
+        if self.hw_settings.fan_available {
             let summary = FanSummary {
                 fan_pwm: self.get_pwm(),
                 abs_max_tec_i: self.abs_max_tec_i,
@@ -83,15 +77,6 @@ impl FanCtrl {
         }
     }
 
-    pub fn adjust_speed(&mut self) {
-        if self.fan_auto && self.available {
-            let scaled_current = self.abs_max_tec_i / MAX_TEC_I;
-            // do not limit upper bound, as it will be limited in the set_pwm()
-            let pwm = (MAX_USER_FAN_PWM * (scaled_current * (scaled_current * self.k_a + self.k_b) + self.k_c)) as u32;
-            self.set_pwm(pwm);
-        }
-    }
-
     pub fn set_auto_mode(&mut self, fan_auto: bool) {
         self.fan_auto = fan_auto;
     }
@@ -103,44 +88,58 @@ impl FanCtrl {
     }
 
     pub fn restore_defaults(&mut self) {
-        self.set_curve(DEFAULT_K_A, DEFAULT_K_B, DEFAULT_K_C);
+        self.set_curve(self.hw_settings.fan_k_a,
+                       self.hw_settings.fan_k_b,
+                       self.hw_settings.fan_k_c);
     }
 
     pub fn set_pwm(&mut self, fan_pwm: u32) -> f32 {
-        if !self.pwm_enabled {
+        if self.fan.is_none() || (!self.pwm_enabled && !self.enable_pwm())  {
-            self.enable_pwm()
+            return 0f32;
         }
+        let fan = self.fan.as_mut().unwrap();
         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 f32, MIN_FAN_PWM, MAX_FAN_PWM, MIN_USER_FAN_PWM, MAX_USER_FAN_PWM);
+        let duty = scale_number(fan_pwm as f32, self.hw_settings.min_fan_pwm, self.hw_settings.max_fan_pwm, MIN_USER_FAN_PWM, MAX_USER_FAN_PWM);
-        let max = self.fan.get_max_duty();
+        let max = fan.get_max_duty();
         let value = ((duty * (max as f32)) as u16).min(max);
-        self.fan.set_duty(value);
+        fan.set_duty(value);
         value as f32 / (max as f32)
     }
 
-    pub fn is_default_auto(&self) -> bool {
+    pub fn fan_pwm_recommended(&self) -> bool {
-        self.default_auto
+        self.hw_settings.fan_pwm_recommended
     }
 
-    fn scale_number(unscaled: f32, to_min: f32, to_max: f32, from_min: f32, from_max: f32) -> f32 {
+    pub fn fan_available(&self) -> bool {
-        (to_max - to_min) * (unscaled - from_min) / (from_max - from_min) + to_min
+        self.hw_settings.fan_available
     }
 
     fn get_pwm(&self) -> u32 {
-        let duty = self.fan.get_duty();
+        if let Some(fan) = &self.fan {
-        let max = self.fan.get_max_duty();
+            let duty = fan.get_duty();
-        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
+            let max = fan.get_max_duty();
+            scale_number(duty as f32 / (max as f32), MIN_USER_FAN_PWM, MAX_USER_FAN_PWM, self.hw_settings.min_fan_pwm, self.hw_settings.max_fan_pwm).round() as u32
+        } else { 0 }
     }
 
-    fn enable_pwm(&mut self) {
+    fn enable_pwm(&mut self) -> bool {
-        if self.available {
+        if self.fan.is_some() && self.hw_settings.fan_available {
-            self.fan.set_duty(0);
+            let fan = self.fan.as_mut().unwrap();
-            self.fan.enable();
+            fan.set_duty(0);
+            fan.enable();
             self.pwm_enabled = true;
+            true
+        } else {
+            false
         }
     }
 }
 
+
+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
+}
+
 #[derive(Serialize)]
 pub struct FanSummary {
     fan_pwm: u32,

src/hw_rev.rs

@@ -2,7 +2,7 @@ use serde::Serialize;
 
 use crate::{
     pins::HWRevPins,
-    command_handler::JsonBuffer
+    command_handler::JsonBuffer,
 };
 
 #[derive(Serialize, Copy, Clone)]
@@ -11,6 +11,23 @@ pub struct HWRev {
     pub minor: u8,
 }
 
+#[derive(Serialize, Clone)]
+pub struct HWSettings {
+    pub fan_k_a: f32,
+    pub fan_k_b: f32,
+    pub fan_k_c: f32,
+    pub min_fan_pwm: f32,
+    pub max_fan_pwm: f32,
+    pub fan_pwm_freq_hz: u32,
+    pub fan_available: bool,
+    pub fan_pwm_recommended: bool,
+}
+
+#[derive(Serialize, Clone)]
+struct HWSummary<'a> {
+    rev: &'a HWRev,
+    settings: &'a HWSettings,
+}
 
 impl HWRev {
     pub fn detect_hw_rev(hwrev_pins: &HWRevPins) -> Self {
@@ -24,18 +41,42 @@ impl HWRev {
         }
     }
 
-    pub fn fan_available(&self) -> bool {
+    pub fn settings(&self) -> HWSettings {
-        self.major == 2 && self.minor == 2
+        match (self.major, self.minor) {
-    }
+            (2, 2) => HWSettings {
-
+                fan_k_a: 1.0,
-    pub fn fan_default_auto(&self) -> bool {
+                fan_k_b: 0.0,
+                fan_k_c: 0.0,
+                // below this value motor's autostart feature may fail,
+                // according to internal experiments
+                min_fan_pwm: 0.04,
+                max_fan_pwm: 1.0,
+                // According to `SUNON DC Brushless Fan & Blower(255-E)` catalogue p.36-37
+                // model MF35101V1-1000U-G99 doesn't have a PWM wire, but we'll follow their others models'
+                // recommended frequency, as it is said by the Thermostat's schematics that we can
+                // use PWM, but not stated at which frequency
+                fan_pwm_freq_hz: 25_000,
+                fan_available: true,
                 // 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
+                fan_pwm_recommended: false,
+            },
+            (_, _) => HWSettings {
+                fan_k_a: 0.0,
+                fan_k_b: 0.0,
+                fan_k_c: 0.0,
+                min_fan_pwm: 0.0,
+                max_fan_pwm: 0.0,
+                fan_pwm_freq_hz: 0,
+                fan_available: false,
+                fan_pwm_recommended: false,
+            }
+        }
     }
 
     pub fn summary(&self) -> Result<JsonBuffer, serde_json_core::ser::Error> {
-        serde_json_core::to_vec(&self)
+        let settings = self.settings();
-
+        let summary = HWSummary { rev: self, settings: &settings };
+        serde_json_core::to_vec(&summary)
     }
 }

src/main.rs

@@ -56,7 +56,6 @@ 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"))]
@@ -121,7 +120,7 @@ fn main() -> ! {
 
     timer::setup(cp.SYST, clocks);
 
-    let (pins, mut leds, mut eeprom, eth_pins, usb, fan) = Pins::setup(
+    let (pins, mut leds, mut eeprom, eth_pins, usb, fan, hwrev, hw_settings) = Pins::setup(
         clocks, dp.TIM1, dp.TIM3, dp.TIM8,
         dp.GPIOA, dp.GPIOB, dp.GPIOC, dp.GPIOD, dp.GPIOE, dp.GPIOF, dp.GPIOG,
         dp.I2C1,
@@ -140,8 +139,6 @@ 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]) {
@@ -154,7 +151,7 @@ fn main() -> ! {
         }
     }
 
-    let mut fan_ctrl = FanCtrl::new(fan, hwrev);
+    let mut fan_ctrl = FanCtrl::new(fan, hw_settings);
 
     // default net config:
     let mut ipv4_config = Ipv4Config {

src/pins.rs

@@ -33,7 +33,8 @@ use stm32_eth::EthPins;
 use crate::{
     channel::{Channel0, Channel1},
     leds::Leds,
-    fan_ctrl::FanPin
+    fan_ctrl::FanPin,
+    hw_rev::{HWRev, HWSettings},
 };
 
 pub type Eeprom = Eeprom24x<
@@ -116,7 +117,6 @@ pub struct Pins {
     pub pwm: PwmPins,
     pub channel0: ChannelPinSet<Channel0>,
     pub channel1: ChannelPinSet<Channel1>,
-    pub hwrev: HWRevPins
 }
 
 impl Pins {
@@ -129,7 +129,7 @@ impl Pins {
         spi2: SPI2, spi4: SPI4, spi5: SPI5,
         adc1: ADC1,
         otg_fs_global: OTG_FS_GLOBAL, otg_fs_device: OTG_FS_DEVICE, otg_fs_pwrclk: OTG_FS_PWRCLK,
-    ) -> (Self, Leds, Eeprom, EthernetPins, USB, FanPin) {
+    ) -> (Self, Leds, Eeprom, EthernetPins, USB, Option<FanPin>, HWRev, HWSettings) {
         let gpioa = gpioa.split();
         let gpiob = gpiob.split();
         let gpioc = gpioc.split();
@@ -196,10 +196,12 @@ impl Pins {
             pwm,
             channel0,
             channel1,
-            hwrev: HWRevPins {hwrev0: gpiod.pd0, hwrev1: gpiod.pd1,
-                hwrev2: gpiod.pd2, hwrev3: gpiod.pd3}
         };
 
+        let hwrev = HWRev::detect_hw_rev(&HWRevPins {hwrev0: gpiod.pd0, hwrev1: gpiod.pd1,
+            hwrev2: gpiod.pd2, hwrev3: gpiod.pd3});
+        let hw_settings = hwrev.settings();
+
         let leds = Leds::new(gpiod.pd9, gpiod.pd10.into_push_pull_output(), gpiod.pd11.into_push_pull_output());
 
         let eeprom_scl = gpiob.pb8.into_alternate().set_open_drain();
@@ -226,12 +228,11 @@ impl Pins {
             hclk: clocks.hclk(),
         };
 
-        // According to `SUNON DC Brushless Fan & Blower(255-E)` catalogue p.36-37
+        let fan = if hw_settings.fan_available {
-        // model MF35101V1-1000U-G99 doesn't have a PWM wire, so it is advised to have
+             Some(Timer::new(tim8, &clocks).pwm(gpioc.pc9.into_alternate(), hw_settings.fan_pwm_freq_hz.hz()))
-        // higher frequency to have less audible noise.
+        } else { None };
-        let fan = Timer::new(tim8, &clocks).pwm(gpioc.pc9.into_alternate(), 25u32.khz());
 
-        (pins, leds, eeprom, eth_pins, usb, fan)
+        (pins, leds, eeprom, eth_pins, usb, fan, hwrev, hw_settings)
     }
 
     /// Configure the GPIO pins for SPI operation, and initialize SPI