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//! Serial interface loopback
//!
//! ```
//!
//! #![feature(const_fn)]
//! #![feature(used)]
//! #![no_std]
//!
//! // 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 rtfm::{C0, C1, C16, P0, P1};
//! use f3::serial::Serial;
//! use f3::stm32f30x::interrupt::Usart1Exti25;
//! use f3::stm32f30x;
//!
//! // CONFIGURATION
//! pub const BAUD_RATE: u32 = 115_200; // bits per second
//!
//! // RESOURCES
//! peripherals!(stm32f30x, {
//! GPIOA: Peripheral {
//! register_block: Gpioa,
//! ceiling: C0,
//! },
//! RCC: Peripheral {
//! register_block: Rcc,
//! ceiling: C0,
//! },
//! USART1: Peripheral {
//! register_block: Usart1,
//! ceiling: C1,
//! },
//! });
//!
//! // INITIALIZATION PHASE
//! fn init(ref prio: P0, ceil: &C16) {
//! let gpioa = GPIOA.access(prio, ceil);
//! let rcc = RCC.access(prio, ceil);
//! let usart1 = USART1.access(prio, ceil);
//!
//! Serial(&usart1).init(&gpioa, &rcc, BAUD_RATE);
//! }
//!
//! // IDLE LOOP
//! fn idle(_prio: P0, _ceil: C0) -> ! {
//! // Sleep
//! loop {
//! rtfm::wfi();
//! }
//! }
//!
//! // TASKS
//! tasks!(stm32f30x, {
//! loopback: Task {
//! interrupt: Usart1Exti25,
//! priority: P1,
//! enabled: true,
//! },
//! });
//!
//! // Send back the received byte
//! 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!()
//! }
//! }
//! ```
// Auto-generated. Do not modify.