Module cortex_m_rtfm::examples::_5_generics
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[src]
Working with resources in a generic fashion
#![deny(unsafe_code)] #![feature(proc_macro)] #![no_std] extern crate cortex_m_rtfm as rtfm; extern crate stm32f103xx; use rtfm::{app, Resource, Threshold}; use stm32f103xx::{SPI1, GPIOA}; app! { device: stm32f103xx, tasks: { EXTI0: { path: exti0, priority: 1, resources: [GPIOA, SPI1], }, EXTI1: { path: exti1, priority: 2, resources: [GPIOA, SPI1], }, }, } fn init(_p: init::Peripherals) {} fn idle() -> ! { loop { rtfm::wfi(); } } // A generic function that uses some resources fn work<G, S>(t: &mut Threshold, gpioa: &G, spi1: &S) where G: Resource<Data = GPIOA>, S: Resource<Data = SPI1>, { gpioa.claim(t, |_gpioa, t| { // drive NSS low spi1.claim(t, |_spi1, _| { // transfer data }); // drive NSS high }); } // This task needs critical sections to access the resources fn exti0(t: &mut Threshold, r: EXTI0::Resources) { work(t, &r.GPIOA, &r.SPI1); } // This task has direct access to the resources fn exti1(t: &mut Threshold, r: EXTI1::Resources) { work(t, r.GPIOA, r.SPI1); }