Module f3::examples::_6_concurrent
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[src]
LED roulette and software loopback running concurrently
#![feature(const_fn)] #![feature(used)] #![no_std] // version = "0.2.0", default-features = false extern crate cast; // version = "0.2.0" extern crate cortex_m_rt; // version = "0.1.0" #[macro_use] extern crate cortex_m_rtfm as rtfm; extern crate f3; use cast::{u8, usize}; use f3::led::{self, LEDS}; use f3::serial::Serial; use f3::stm32f30x::interrupt::{Tim7, Usart1Exti25}; use f3::stm32f30x; use f3::timer::Timer; use rtfm::{C0, C1, C16, Local, P0, P1}; // CONFIGURATION pub const BAUD_RATE: u32 = 115_200; // bits per second const FREQUENCY: u32 = 4; // Hz // RESOURCES peripherals!(stm32f30x, { GPIOA: Peripheral { register_block: Gpioa, ceiling: C0, }, GPIOE: Peripheral { register_block: Gpioe, ceiling: C0, }, RCC: Peripheral { register_block: Rcc, ceiling: C0, }, TIM7: Peripheral { register_block: Tim7, ceiling: C1, }, USART1: Peripheral { register_block: Usart1, ceiling: C1, }, }); // INITIALIZATION PHASE fn init(ref prio: P0, ceil: &C16) { let gpioa = GPIOA.access(prio, ceil); let gpioe = GPIOE.access(prio, ceil); let rcc = RCC.access(prio, ceil); let tim7 = TIM7.access(prio, ceil); let timer = Timer(&tim7); let usart1 = USART1.access(prio, ceil); led::init(&gpioe, &rcc); timer.init(&rcc, FREQUENCY); Serial(&usart1).init(&gpioa, &rcc, BAUD_RATE); timer.resume(); } // IDLE LOOP fn idle(_prio: P0, _ceil: C0) -> ! { // Sleep loop { rtfm::wfi(); } } // TASKS tasks!(stm32f30x, { loopback: Task { interrupt: Usart1Exti25, priority: P1, enabled: true, }, roulette: Task { interrupt: Tim7, priority: P1, enabled: true, }, }); fn loopback(_task: Usart1Exti25, ref prio: P1, ref ceil: C1) { let usart1 = USART1.access(prio, ceil); let serial = Serial(&usart1); if let Ok(byte) = serial.read() { if serial.write(byte).is_err() { // As we are echoing the bytes as soon as they arrive, it should // be impossible to have a TX buffer overrun #[cfg(debug_assertions)] unreachable!() } } else { // Only reachable through `rtfm::request(loopback)` #[cfg(debug_assertions)] unreachable!() } } fn roulette(mut task: Tim7, ref prio: P1, ref ceil: C1) { static STATE: Local<u8, Tim7> = Local::new(0); let tim7 = TIM7.access(prio, ceil); let timer = Timer(&tim7); if timer.clear_update_flag().is_ok() { let state = STATE.borrow_mut(&mut task); let curr = *state; let next = (curr + 1) % u8(LEDS.len()).unwrap(); LEDS[usize(curr)].off(); LEDS[usize(next)].on(); *state = next; } else { // Only reachable through `rtfm::request(roulette)` #[cfg(debug_assertion)] unreachable!() } }