paul/stm32f4disc-demo
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Add an interrupt to the user button; reverse LED cycle direction

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Paul van Tilburg 2019-03-06 21:16:05 +01:00
parent 283655e30e
commit d0216915c2
1 changed files with 36 additions and 8 deletions
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44
src/main.rs
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@ -6,7 +6,7 @@
extern crate panic_semihosting;
//use cortex_m_semihosting::hprintln;
use hal::gpio::{ExtiPin, Output, PushPull};
use hal::gpio::{Edge, ExtiPin, Floating, Input, Output, PushPull};
use hal::prelude::*;
use rtfm::app;
@ -14,10 +14,18 @@ type Led = hal::gpio::gpiod::PD<Output<PushPull>>;
const PERIOD: u32 = 8_000_000;
pub enum LedDirection {
Clockwise,
CounterClockwise,
}
#[app(device = hal::stm32)]
const APP: () = {
static mut index: usize = ();
static mut button: hal::gpio::gpioa::PA0<Input<Floating>> = ();
static mut leds: [Led; 4] = ();
static mut led_cycle_direction: LedDirection = LedDirection::Clockwise;
static mut led_index: usize = 0;
static mut exti: hal::stm32::EXTI = ();
#[init(spawn = [switch_leds])]
fn init() -> init::LateResources {
@ -31,21 +39,41 @@ const APP: () = {
];
spawn.switch_leds().unwrap();
// Set up the EXTI0 interrup for the user button.
let mut exti = device.EXTI;
let gpioa = device.GPIOA.split();
let mut button = gpioa.pa0.into_floating_input();
button.enable_interrupt(&mut exti);
button.trigger_on_edge(&mut exti, Edge::RISING);
init::LateResources { index: 0, leds }
init::LateResources { button, exti, leds }
}
#[task(schedule = [switch_leds], resources = [index, leds])]
#[task(schedule = [switch_leds],
resources = [led_index, led_cycle_direction, leds])]
fn switch_leds() {
let index = *resources.index;
let led_index = *resources.led_index;
let num_leds = resources.leds.len();
resources.leds[index].set_high();
resources.leds[(index + 2) % num_leds].set_low();
*resources.index = (index + 1) % 4;
resources.leds[led_index].set_high();
resources.leds[(led_index + 2) % num_leds].set_low();
*resources.led_index = match *resources.led_cycle_direction {
LedDirection::Clockwise => (led_index + 1) % num_leds,
LedDirection::CounterClockwise => (led_index + 3) % num_leds,
};
schedule.switch_leds(scheduled + PERIOD.cycles()).unwrap();
}
#[interrupt(binds = EXTI0, resources = [button, exti, led_cycle_direction])]
fn button_pressed() {
*resources.led_cycle_direction = match *resources.led_cycle_direction {
LedDirection::Clockwise => LedDirection::CounterClockwise,
LedDirection::CounterClockwise => LedDirection::Clockwise,
};
resources.button.clear_interrupt_pending_bit(resources.exti);
}
extern "C" {
fn UART4();
}