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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
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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 rtic::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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#[rtic::app(device = lm3s6965, monotonic = rtic::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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// RTIC requires that unused interrupts are declared in an extern block when
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// using software tasks; these free interrupts will be used to dispatch the
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// software tasks.
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extern "C" {
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fn SSI0();
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}
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};
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