Resolve "Setup basic scheduler"

Cargo.toml

@@ -6,34 +6,17 @@ name = "fan_monitor"
 version = "0.1.0"
 
 [dependencies]
+embedded-hal = "0.2.6"
+nb = "0.1.2"
 cortex-m = "0.6.0"
 cortex-m-rt = "0.6.10"
 cortex-m-semihosting = "0.3.3"
 panic-halt = "0.2.0"
-embedded-hal = "0.2.3"
 hd44780-driver = "0.3.0"
-nb = "0.1.1"
-
-[dependencies.stm32f1]
-version = "0.8.0"
-features = ["stm32f103", "rt"]
 
 [dependencies.stm32f1xx-hal]
-version = "0.4.0"
+version = "0.7.0"
-features = ["stm32f103", "rt"]
+features = ["stm32f103", "rt", "medium"]
-
-# Uncomment for the panic example.
-# panic-itm = "0.4.1"
-
-# Uncomment for the allocator example.
-# alloc-cortex-m = "0.3.5"
-
-# Uncomment for the device example.
-# Update `memory.x`, set target to `thumbv7em-none-eabihf` in `.cargo/config`,
-# and then use `cargo build --examples device` to build it.
-# [dependencies.stm32f3]
-# features = ["stm32f303", "rt"]
-# version = "0.7.1"
 
 # this lets you use `cargo fix`!
 [[bin]]
@@ -45,3 +28,4 @@ bench = false
 codegen-units = 1 # better optimizations
 debug = true # symbols are nice and they don't increase the size on Flash
 lto = true # better optimizations
+

openocd.gdb

@@ -0,0 +1,40 @@
+target extended-remote :3333
+
+# print demangled symbols
+set print asm-demangle on
+
+# set backtrace limit to not have infinite backtrace loops
+set backtrace limit 32
+
+# detect unhandled exceptions, hard faults and panics
+break DefaultHandler
+break HardFault
+break rust_begin_unwind
+# # run the next few lines so the panic message is printed immediately
+# # the number needs to be adjusted for your panic handler
+# commands $bpnum
+# next 4
+# end
+
+# *try* to stop at the user entry point (it might be gone due to inlining)
+break main
+
+monitor arm semihosting enable
+
+# # send captured ITM to the file itm.fifo
+# # (the microcontroller SWO pin must be connected to the programmer SWO pin)
+# # 8000000 must match the core clock frequency
+# monitor tpiu config internal itm.txt uart off 8000000
+
+# # OR: make the microcontroller SWO pin output compatible with UART (8N1)
+# # 8000000 must match the core clock frequency
+# # 2000000 is the frequency of the SWO pin
+# monitor tpiu config external uart off 8000000 2000000
+
+# # enable ITM port 0
+# monitor itm port 0 on
+
+load
+
+# start the process but immediately halt the processor
+stepi

src/lcd_gui.rs

@@ -0,0 +1,110 @@
+use core::{sync::atomic::{AtomicBool, Ordering}};
+
+use embedded_hal::{
+    //digital::v1_compat::OldOutputPin,
+    digital::v2::OutputPin,
+    Qei,
+    blocking::delay::{DelayUs, DelayMs},
+};
+
+use hd44780_driver::{
+    HD44780,
+    display_mode::DisplayMode,
+    bus::DataBus,
+};
+
+pub struct LCDGui<L, Q, B> 
+where
+    L: LCDScreen,
+    Q: Qei<Count = u16>,
+    B: OutputPin,
+{
+    lcd: L,
+    qei: Q,
+    button: &'static AtomicBool,
+    backlight: Option<B>, 
+    count: u16,
+}
+
+impl<L, Q, B> LCDGui<L, Q, B>
+where
+    L: LCDScreen,
+    Q: Qei<Count = u16>,
+    B: OutputPin,
+{
+
+    pub fn new(lcd: L, qei: Q, button: &'static AtomicBool, backlight: Option<B>) 
+        -> LCDGui<L, Q, B> {
+        use hd44780_driver::{Cursor, CursorBlink, Display};
+
+        let count = qei.count();
+        let mut gui = LCDGui {lcd, qei, button, backlight, count};
+
+        if let Some(bl) = &mut gui.backlight { let _ = bl.set_high(); };
+
+        gui.lcd.reset();
+        gui.lcd.clear();
+        gui.lcd.set_display_mode(
+            DisplayMode {
+                display: Display::On,
+                cursor_visibility: Cursor::Visible,
+                cursor_blink: CursorBlink::On,
+            }
+        );
+        let _ = gui.lcd.write_str("Hello world!");
+
+        gui
+    }
+
+    pub fn run(&mut self) -> ! {
+        loop {
+            //TODO deduplicate button detection
+            if self.button.swap(false, Ordering::AcqRel) {
+                self.lcd.write_str("paf").unwrap();
+            }
+
+            if self.count != self.qei.count() {
+                self.count = self.qei.count();
+                self.lcd.set_cursor_pos(0x40);
+                self.lcd.write_str("  ").unwrap();
+                self.lcd.set_cursor_pos(0x40);
+                write!(self.lcd, "{}", self.qei.count()/2).unwrap();
+            }
+    
+            // put device in sleep mode until next interrupt (button or timer)
+            cortex_m::asm::wfi();
+        }
+    }
+}
+
+pub trait LCDScreen: core::fmt::Write {
+
+    fn reset(&mut self);
+    fn clear(&mut self);
+    fn set_display_mode(&mut self, mode: DisplayMode);
+    fn set_cursor_pos(&mut self, positions: u8);
+}
+
+impl<D, DB> LCDScreen for HD44780<D, DB> 
+where
+    D: DelayUs<u16> + DelayMs<u8>,
+    DB: DataBus,
+{
+
+    fn reset(&mut self) {
+        self.reset()
+    }
+
+    fn clear(&mut self) {
+        self.clear()
+    }
+
+    fn set_display_mode(&mut self, mode: DisplayMode) {
+        self.set_display_mode(mode)
+    }
+
+    fn set_cursor_pos(&mut self, position: u8) {
+        self.set_cursor_pos(position);
+    }
+}
+

src/main.rs

@@ -1,11 +1,15 @@
 #![no_std]
 #![no_main]
+
+mod lcd_gui;
+
+use lcd_gui::LCDGui;
  
 extern crate panic_halt;
 
 use core::{
     cell::RefCell,
-    fmt::Write,
+    sync::atomic::{AtomicBool, Ordering},
 };
 
 use cortex_m::interrupt::Mutex;
@@ -17,63 +21,108 @@ use embedded_hal::digital::{
 };
  
 use stm32f1xx_hal::{
-    delay::Delay,
+    gpio::*,
-    gpio::{gpioc, gpiob, Output, PushPull},
     pac,
-    pac::{interrupt, Interrupt},
+    pac::{interrupt, Interrupt, EXTI},
     prelude::*,
-    timer::{Event, Timer},
+    timer::{Timer, CountDownTimer, Event},
-    qei::Qei,
+    qei::{QeiOptions, SlaveMode},
+    rtc::Rtc,
 };
 
-use hd44780_driver::{Cursor, CursorBlink, Display, DisplayMode, HD44780};
+//--------------------------------------------------------------------------------------------------
+/* system config */
 
+const GUI_TICK_SEC: f32 = 0.2;
+const HEARTBEAT_SEC: f32 = 1.0;
+
+const TEMPS_TICK_SEC: u32 = 5;
+
+//--------------------------------------------------------------------------------------------------
+/* interrupt variables */
+
+// tick/heartbeat timer
 static PCB_LED: Mutex<RefCell<Option<gpioc::PC13<Output<PushPull>>>>> 
     = Mutex::new(RefCell::new(None)); 
+static TICK_TIMER: Mutex<RefCell<Option<CountDownTimer<pac::TIM2>>>>
+    = Mutex::new(RefCell::new(None));
+
+// button interrupt
+static BUTTON_PIN: Mutex<RefCell<Option<gpiob::PB8<Input<PullUp>>>>> 
+    = Mutex::new(RefCell::new(None));
+static BUTTON_FLAG: AtomicBool = AtomicBool::new(false);
+
+// temps interrupt
 static RED_LED: Mutex<RefCell<Option<gpiob::PB11<Output<PushPull>>>>> 
     = Mutex::new(RefCell::new(None)); 
-static TIMER: Mutex<RefCell<Option<Timer<pac::TIM2>>>> = Mutex::new(RefCell::new(None));
+static RTC: Mutex<RefCell<Option<Rtc>>> = Mutex::new(RefCell::new(None));
-static TIMER2: Mutex<RefCell<Option<Timer<pac::TIM3>>>> = Mutex::new(RefCell::new(None));
+static G_EXTI: Mutex<RefCell<Option<EXTI>>> = Mutex::new(RefCell::new(None));
 
+//--------------------------------------------------------------------------------------------------
+/* interrupt service routines */
 #[interrupt]
 fn TIM2() {
    
-    cortex_m::interrupt::free(|cs| {
+    static mut TICK_DIVIDER: u32 = 0;
-        let _ = PCB_LED.borrow(cs).borrow_mut().as_mut().unwrap().toggle();
-    });
 
     cortex_m::interrupt::free(|cs| {
-        let _ = TIMER.borrow(cs).borrow_mut().as_mut().unwrap().clear_update_interrupt_flag();
+        let _ = TICK_TIMER.borrow(cs).borrow_mut().as_mut().unwrap().clear_update_interrupt_flag();
     });
+
+    *TICK_DIVIDER += 1;
+    if *TICK_DIVIDER >= (HEARTBEAT_SEC / GUI_TICK_SEC) as u32 {
+        *TICK_DIVIDER = 0;
+        cortex_m::interrupt::free(|cs| {
+            let _ = PCB_LED.borrow(cs).borrow_mut().as_mut().unwrap().toggle();
+        });
+    }
 }
 
 #[interrupt]
-fn TIM3() {
+fn EXTI9_5() {
    
     cortex_m::interrupt::free(|cs| {
-        let _ = RED_LED.borrow(cs).borrow_mut().as_mut().unwrap().toggle();
+        let _ = BUTTON_PIN.borrow(cs).borrow_mut().as_mut().unwrap().clear_interrupt_pending_bit();
+    });
+
+    BUTTON_FLAG.store(true, Ordering::Release);
+}
+
+#[interrupt]
+fn RTCALARM() {
+    
+    cortex_m::interrupt::free(|cs| {
+        let _ = G_EXTI.borrow(cs).borrow_mut().as_mut().unwrap().pr.write(|w| w.pr17().set_bit());
     });
 
     cortex_m::interrupt::free(|cs| {
-        let _ = TIMER2.borrow(cs).borrow_mut().as_mut().unwrap().clear_update_interrupt_flag();
+        let mut rtc = RTC.borrow(cs).borrow_mut();
+        let time = rtc.as_mut().unwrap().current_time();
+        rtc.as_mut().unwrap().set_alarm(time + TEMPS_TICK_SEC); //also clears the flag
+    });
+
+    cortex_m::interrupt::free(|cs| {
+        let _ = RED_LED.borrow(cs).borrow_mut().as_mut().unwrap().toggle();
     });
 }
  
+//--------------------------------------------------------------------------------------------------
+/* main function */
 #[entry]
 fn main() -> ! {
-    // Get access to the core peripherals from the cortex-m crate
+
-    let cp = cortex_m::Peripherals::take().unwrap();
+    /* setup */
-    // Get access to the device specific peripherals from the peripheral access crate
+
-    let dp = pac::Peripherals::take().unwrap();
+    // basic setup
+    let mut cp = cortex_m::Peripherals::take().unwrap();
+    let mut dp = pac::Peripherals::take().unwrap();
  
-    // Take ownership over the raw flash and rcc devices and convert them into the corresponding
+    // clocks config
-    // HAL structs
-    let mut flash = dp.FLASH.constrain();
     let mut rcc = dp.RCC.constrain();
- 
+    let mut flash = dp.FLASH.constrain();
-    // Freeze the configuration of all the clocks in the system and store the frozen frequencies in
+    let clocks = rcc.cfgr
-    // `clocks`
+        .use_hse(8.mhz())
-    let clocks = rcc.cfgr.freeze(&mut flash.acr);
+        .freeze(&mut flash.acr);
 
     // GPIOs
     let mut gpioa = dp.GPIOA.split(&mut rcc.apb2);
@@ -83,45 +132,49 @@ fn main() -> ! {
     // setup LED
     let mut led = gpioc.pc13.into_push_pull_output(&mut gpioc.crh);
     let _ = led.set_high();
+
     cortex_m::interrupt::free(|cs| {
         PCB_LED.borrow(cs).borrow_mut().replace(led)
     });
     
-    // Configure the syst timer to trigger an update every second
+    // Configure the timer 2 as tick timer
-    let mut timer = Timer::tim2(dp.TIM2, 1.hz(), clocks, &mut rcc.apb1);
+    let mut timer = Timer::tim2(dp.TIM2, &clocks, &mut rcc.apb1)
+        .start_count_down(((1.0/GUI_TICK_SEC) as u32).hz());
     timer.listen(Event::Update);
+
     cortex_m::interrupt::free(|cs| {
-        TIMER.borrow(cs).borrow_mut().replace(timer)
+        TICK_TIMER.borrow(cs).borrow_mut().replace(timer)
     });
 
     // setup LED
-    let mut led = gpiob.pb11.into_push_pull_output(&mut gpiob.crh);
+    let mut red_led = gpiob.pb11.into_push_pull_output(&mut gpiob.crh);
-    let _ = led.set_high();
+    let _ = red_led.set_high();
+
     cortex_m::interrupt::free(|cs| {
-        RED_LED.borrow(cs).borrow_mut().replace(led)
+        RED_LED.borrow(cs).borrow_mut().replace(red_led)
+    });
+
+    // set EXTI 17 (see note in 18.4.2, in short : needed for rtc ISR to trigger)
+    dp.EXTI.ftsr.write(|w| w.tr17().set_bit());
+    dp.EXTI.imr.write(|w| w.mr17().set_bit());
+
+    // setup RTC
+    let mut backup_domain = rcc.bkp.constrain(dp.BKP, &mut rcc.apb1, &mut dp.PWR);
+    let mut rtc = Rtc::rtc(dp.RTC, &mut backup_domain);
+    rtc.set_alarm(rtc.current_time() + TEMPS_TICK_SEC);
+    rtc.listen_alarm();
+
+    cortex_m::interrupt::free(|cs| {
+        RTC.borrow(cs).borrow_mut().replace(rtc)
     });
     
-    // Configure the syst timer to trigger an update every second
-    let mut timer = Timer::tim3(dp.TIM3, 5.hz(), clocks, &mut rcc.apb1);
-    timer.listen(Event::Update);
-    cortex_m::interrupt::free(|cs| {
-        TIMER2.borrow(cs).borrow_mut().replace(timer)
-    });
-
-    // Enable timer interrupts
-    unsafe {
-        cortex_m::peripheral::NVIC::unmask(Interrupt::TIM2);
-        cortex_m::peripheral::NVIC::unmask(Interrupt::TIM3);
-    } 
-
     let mut afio = dp.AFIO.constrain(&mut rcc.apb2);
 
     // Setup display
-    let mut lcd = {
+    let mut gui = {
-
+        use stm32f1xx_hal::{gpio::*, delay::Delay};
-        // Set backlight
+        
-        let mut backlight_pin = gpiob.pb9.into_push_pull_output(&mut gpiob.crh);
+        use hd44780_driver::HD44780;
-        let _ = backlight_pin.set_high();
 
         // Disable JTAG to free pins
         let (d3_pin, d5_pin, d7_pin) = afio.mapr.disable_jtag(gpioa.pa15, gpiob.pb3, gpiob.pb4);
@@ -140,9 +193,9 @@ fn main() -> ! {
 
         // Force write mode
         let mut rw_pin = gpioa.pa9.into_push_pull_output(&mut gpioa.crh);
-        rw_pin.set_low();
+        rw_pin.set_low().unwrap();
 
-        HD44780::new_8bit(
+        let lcd = HD44780::new_8bit(
             OldOutputPin::new(rs_pin), 
             OldOutputPin::new(en_pin), 
             OldOutputPin::new(d0_pin), 
@@ -154,39 +207,56 @@ fn main() -> ! {
             OldOutputPin::new(d6_pin),
             OldOutputPin::new(d7_pin), 
             Delay::new(cp.SYST, clocks)
-    )};
+        );
 
-    // setup encoder
+        // setup button (interrupt)
-    let enc = Qei::tim4(dp.TIM4, (gpiob.pb6, gpiob.pb7), &mut afio.mapr, &mut rcc.apb1);
+        let mut but_pin = gpiob.pb8.into_pull_up_input(&mut gpiob.crh);
+        but_pin.make_interrupt_source(&mut afio);
+        but_pin.trigger_on_edge(&dp.EXTI, Edge::RISING);
+        but_pin.enable_interrupt(&dp.EXTI);
 
-    lcd.reset();
+        cortex_m::interrupt::free(|cs| {
-    lcd.clear();
+            BUTTON_PIN.borrow(cs).borrow_mut().replace(but_pin);
-    lcd.set_display_mode(
+        });
-        DisplayMode {
-            display: Display::On,
-            cursor_visibility: Cursor::Visible,
-            cursor_blink: CursorBlink::On,
-        }
-    );
-    let _ = lcd.write_str("Hello world!");
 
-    lcd.set_cursor_pos(0x40);
+        // Set backlight
-    write!(lcd, "{}", enc.count()/4).unwrap();
+        let backlight_pin = gpiob.pb9.into_push_pull_output(&mut gpiob.crh);
-    let mut old_count = enc.count();
 
-    loop {
+        // setup encoder
-        if enc.count() != old_count {
+        let enc = Timer::tim4(dp.TIM4, &clocks, &mut rcc.apb1)
-            old_count = enc.count();
+            .qei((gpiob.pb6, gpiob.pb7), &mut afio.mapr, 
-            lcd.set_cursor_pos(0x40);
+                 QeiOptions { 
-            lcd.write_str("     ");
+                     slave_mode:SlaveMode::EncoderMode2, 
-            lcd.set_cursor_pos(0x40);
+                     auto_reload_value: 200
-            write!(lcd, "{}", enc.count()/4).unwrap();
+                 });
-        }
+
-        for i in 0..10000 {
+        LCDGui::new(lcd, enc, &BUTTON_FLAG, Some(backlight_pin))
-            cortex_m::asm::nop;
+    };
-        }
+    
+    let exti = dp.EXTI;
+    cortex_m::interrupt::free(|cs| {
+        G_EXTI.borrow(cs).borrow_mut().replace(exti);
+    });
+
+    // Enable interrupts
+    unsafe {
+        cortex_m::peripheral::NVIC::unmask(Interrupt::TIM2);
+        cortex_m::peripheral::NVIC::unmask(Interrupt::EXTI9_5);
+        cortex_m::peripheral::NVIC::unmask(Interrupt::RTCALARM);
     }
+
+    // allow the debugging to continue in sleep and stop modes
+    #[cfg(debug_assertions)]
+    dp.DBGMCU.cr.write(|w| w.dbg_sleep().set_bit());
+    #[cfg(debug_assertions)]
+    dp.DBGMCU.cr.write(|w| w.dbg_stop().set_bit());
+
+    // configure stop mode (not working yet, probably due to fake chip)
+    //dp.PWR.cr.write(|w| w.pdds().stop_mode());
+    //dp.PWR.cr.write(|w| w.lpds().set_bit());
+    cp.SCB.set_sleepdeep();
+
+    /* run */
+    gui.run();
 }
 
-
-