mirror of
https://github.com/rtic-rs/rtic.git
synced 2024-12-30 22:09:33 +01:00
8e636f0d12
Some beginners are confused about the "extern" section, so I added an explanation comment to all examples. Furthermore, using the UARTx interrupts when UART is actually being used in the same example may be confusing, so I changed them all to SSI0/QEI0.
38 lines
1,003 B
Rust
38 lines
1,003 B
Rust
//! examples/periodic.rs
|
|
|
|
#![deny(unsafe_code)]
|
|
#![deny(warnings)]
|
|
#![no_main]
|
|
#![no_std]
|
|
|
|
use cortex_m_semihosting::hprintln;
|
|
use panic_semihosting as _;
|
|
use rtic::cyccnt::{Instant, U32Ext};
|
|
|
|
const PERIOD: u32 = 8_000_000;
|
|
|
|
// NOTE: does NOT work on QEMU!
|
|
#[rtic::app(device = lm3s6965, monotonic = rtic::cyccnt::CYCCNT)]
|
|
const APP: () = {
|
|
#[init(schedule = [foo])]
|
|
fn init(cx: init::Context) {
|
|
// omitted: initialization of `CYCCNT`
|
|
|
|
cx.schedule.foo(cx.start + PERIOD.cycles()).unwrap();
|
|
}
|
|
|
|
#[task(schedule = [foo])]
|
|
fn foo(cx: foo::Context) {
|
|
let now = Instant::now();
|
|
hprintln!("foo(scheduled = {:?}, now = {:?})", cx.scheduled, now).unwrap();
|
|
|
|
cx.schedule.foo(cx.scheduled + PERIOD.cycles()).unwrap();
|
|
}
|
|
|
|
// RTIC requires that unused interrupts are declared in an extern block when
|
|
// using software tasks; these free interrupts will be used to dispatch the
|
|
// software tasks.
|
|
extern "C" {
|
|
fn SSI0();
|
|
}
|
|
};
|