Add an interrupt to the user button; reverse LED cycle direction
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283655e30e
commit
d0216915c2
44
src/main.rs
44
src/main.rs
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@ -6,7 +6,7 @@
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extern crate panic_semihosting;
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//use cortex_m_semihosting::hprintln;
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use hal::gpio::{ExtiPin, Output, PushPull};
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use hal::gpio::{Edge, ExtiPin, Floating, Input, Output, PushPull};
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use hal::prelude::*;
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use rtfm::app;
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@ -14,10 +14,18 @@ type Led = hal::gpio::gpiod::PD<Output<PushPull>>;
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const PERIOD: u32 = 8_000_000;
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pub enum LedDirection {
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Clockwise,
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CounterClockwise,
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}
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#[app(device = hal::stm32)]
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const APP: () = {
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static mut index: usize = ();
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static mut button: hal::gpio::gpioa::PA0<Input<Floating>> = ();
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static mut leds: [Led; 4] = ();
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static mut led_cycle_direction: LedDirection = LedDirection::Clockwise;
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static mut led_index: usize = 0;
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static mut exti: hal::stm32::EXTI = ();
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#[init(spawn = [switch_leds])]
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fn init() -> init::LateResources {
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@ -31,21 +39,41 @@ const APP: () = {
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];
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spawn.switch_leds().unwrap();
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// Set up the EXTI0 interrup for the user button.
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let mut exti = device.EXTI;
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let gpioa = device.GPIOA.split();
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let mut button = gpioa.pa0.into_floating_input();
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button.enable_interrupt(&mut exti);
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button.trigger_on_edge(&mut exti, Edge::RISING);
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init::LateResources { index: 0, leds }
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init::LateResources { button, exti, leds }
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}
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#[task(schedule = [switch_leds], resources = [index, leds])]
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#[task(schedule = [switch_leds],
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resources = [led_index, led_cycle_direction, leds])]
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fn switch_leds() {
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let index = *resources.index;
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let led_index = *resources.led_index;
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let num_leds = resources.leds.len();
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resources.leds[index].set_high();
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resources.leds[(index + 2) % num_leds].set_low();
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*resources.index = (index + 1) % 4;
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resources.leds[led_index].set_high();
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resources.leds[(led_index + 2) % num_leds].set_low();
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*resources.led_index = match *resources.led_cycle_direction {
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LedDirection::Clockwise => (led_index + 1) % num_leds,
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LedDirection::CounterClockwise => (led_index + 3) % num_leds,
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};
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schedule.switch_leds(scheduled + PERIOD.cycles()).unwrap();
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}
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#[interrupt(binds = EXTI0, resources = [button, exti, led_cycle_direction])]
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fn button_pressed() {
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*resources.led_cycle_direction = match *resources.led_cycle_direction {
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LedDirection::Clockwise => LedDirection::CounterClockwise,
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LedDirection::CounterClockwise => LedDirection::Clockwise,
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};
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resources.button.clear_interrupt_pending_bit(resources.exti);
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}
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extern "C" {
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fn UART4();
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}
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