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7266ffe3a6
The example above this in the documentation states
```
// semantically, the monotonic timer is frozen at time "zero" during `init`
// NOTE do *not* call `Instant::now` in this context; it will return a nonsense value
let now = cx.start; // the start time of the system
```
It results in weird scheduling issues, but still eventually works. `cx.start` is much more reliable.
Relates to https://github.com/rtfm-rs/cortex-m-rtfm/issues/196
35 lines
820 B
Rust
35 lines
820 B
Rust
//! examples/periodic.rs
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#![deny(unsafe_code)]
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#![deny(warnings)]
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#![no_main]
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#![no_std]
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use cortex_m_semihosting::hprintln;
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use panic_semihosting as _;
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use rtfm::cyccnt::{Instant, U32Ext};
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const PERIOD: u32 = 8_000_000;
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// NOTE: does NOT work on QEMU!
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#[rtfm::app(device = lm3s6965, monotonic = rtfm::cyccnt::CYCCNT)]
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const APP: () = {
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#[init(schedule = [foo])]
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fn init(cx: init::Context) {
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// omitted: initialization of `CYCCNT`
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cx.schedule.foo(cx.start + PERIOD.cycles()).unwrap();
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}
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#[task(schedule = [foo])]
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fn foo(cx: foo::Context) {
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let now = Instant::now();
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hprintln!("foo(scheduled = {:?}, now = {:?})", cx.scheduled, now).unwrap();
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cx.schedule.foo(cx.scheduled + PERIOD.cycles()).unwrap();
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}
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extern "C" {
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fn UART0();
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}
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};
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