59 lines
1.3 KiB
Rust
59 lines
1.3 KiB
Rust
//! Using a device crate
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//!
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//! Crates generated using [`svd2rust`] are referred to as device crates. These crates provide an
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//! API to access the peripherals of a device.
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//!
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//! [`svd2rust`]: https://crates.io/crates/svd2rust
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//!
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//! This example depends on the [`stm32f103xx`] crate so you'll have to add it to your Cargo.toml.
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//!
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//! [`stm32f103xx`]: https://crates.io/crates/stm32f103xx
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//!
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//! ```
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//! $ edit Cargo.toml && tail $_
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//! [dependencies.stm32f103xx]
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//! features = ["rt"]
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//! version = "0.10.0"
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//! ```
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//!
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//! ---
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#![no_main]
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#![no_std]
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#[allow(unused_extern_crates)]
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extern crate panic_halt;
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use cortex_m::peripheral::syst::SystClkSource;
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use cortex_m_rt::entry;
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use cortex_m_semihosting::hprint;
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use stm32f30x::{interrupt, Interrupt};
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#[entry]
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fn main() -> ! {
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let p = cortex_m::Peripherals::take().unwrap();
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let mut syst = p.SYST;
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let mut nvic = p.NVIC;
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nvic.enable(Interrupt::EXTI0);
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// configure the system timer to wrap around every second
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syst.set_clock_source(SystClkSource::Core);
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syst.set_reload(8_000_000); // 1s
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syst.enable_counter();
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loop {
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// busy wait until the timer wraps around
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while !syst.has_wrapped() {}
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// trigger the `EXTI0` interrupt
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NVIC::pend(Interrupt::EXTI0);
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}
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}
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#[interrupt]
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fn EXTI0() {
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hprint!(".").unwrap();
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}
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