
3 changed files with 108 additions and 2 deletions
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#![no_main] |
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#![no_std] |
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use panic_halt as _; |
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use stm32f0xx_hal as hal; |
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use crate::hal::{ |
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gpio::*, |
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prelude::*, |
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stm32::{interrupt, Interrupt, Peripherals, TIM7}, |
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time::Hertz, |
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timers::*, |
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}; |
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use cortex_m_rt::entry; |
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use core::cell::RefCell; |
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use cortex_m::{interrupt::Mutex, peripheral::Peripherals as c_m_Peripherals}; |
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// A type definition for the GPIO pin to be used for our LED
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type LEDPIN = gpioa::PA5<Output<PushPull>>; |
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// Make LED pin globally available
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static GLED: Mutex<RefCell<Option<LEDPIN>>> = Mutex::new(RefCell::new(None)); |
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// Make timer interrupt registers globally available
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static GINT: Mutex<RefCell<Option<Timer<TIM7>>>> = Mutex::new(RefCell::new(None)); |
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// Define an interupt handler, i.e. function to call when interrupt occurs. Here if our external
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// interrupt trips when the timer timed out
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#[interrupt] |
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fn TIM7() { |
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static mut LED: Option<LEDPIN> = None; |
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static mut INT: Option<Timer<TIM7>> = None; |
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let led = LED.get_or_insert_with(|| { |
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cortex_m::interrupt::free(|cs| { |
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// Move LED pin here, leaving a None in its place
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GLED.borrow(cs).replace(None).unwrap() |
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}) |
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}); |
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let int = INT.get_or_insert_with(|| { |
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cortex_m::interrupt::free(|cs| { |
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// Move LED pin here, leaving a None in its place
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GINT.borrow(cs).replace(None).unwrap() |
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}) |
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}); |
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led.toggle().ok(); |
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int.wait().ok(); |
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} |
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#[entry] |
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fn main() -> ! { |
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if let (Some(mut p), Some(cp)) = (Peripherals::take(), c_m_Peripherals::take()) { |
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cortex_m::interrupt::free(move |cs| { |
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let mut rcc = p |
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.RCC |
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.configure() |
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.hsi48() |
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.enable_crs(p.CRS) |
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.sysclk(48.mhz()) |
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.pclk(24.mhz()) |
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.freeze(&mut p.FLASH); |
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let gpioa = p.GPIOA.split(&mut rcc); |
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// (Re-)configure PA5 as output
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let led = gpioa.pa5.into_push_pull_output(cs); |
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// Move the pin into our global storage
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*GLED.borrow(cs).borrow_mut() = Some(led); |
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// Set up a timer expiring after 1s
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let mut timer = Timer::tim7(p.TIM7, Hertz(1), &mut rcc); |
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// Generate an interrupt when the timer expires
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timer.listen(Event::TimeOut); |
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// Move the timer into our global storage
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*GINT.borrow(cs).borrow_mut() = Some(timer); |
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// Enable TIM7 IRQ, set prio 1 and clear any pending IRQs
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let mut nvic = cp.NVIC; |
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unsafe { |
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nvic.set_priority(Interrupt::TIM7, 1); |
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cortex_m::peripheral::NVIC::unmask(Interrupt::TIM7); |
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} |
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cortex_m::peripheral::NVIC::unpend(Interrupt::TIM7); |
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}); |
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} |
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loop { |
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continue; |
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} |
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} |
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