rp-hal-boards/boards/rp-pico/examples/pico_blinky.rs

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//! # Pico Blinky Example
//!
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//! Blinks the LED on a Pico board.
//!
//! This will blink an LED attached to GP25, which is the pin the Pico uses for
//! the on-board LED.
//!
//! See the `Cargo.toml` file for Copyright and licence details.
#![no_std]
#![no_main]
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// The macro for our start-up function
use rp_pico::entry;
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// GPIO traits
use embedded_hal::digital::v2::OutputPin;
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// Time handling traits
use embedded_time::rate::*;
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// Ensure we halt the program on panic (if we don't mention this crate it won't
// be linked)
use panic_halt as _;
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// Pull in any important traits
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use rp_pico::hal::prelude::*;
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// A shorter alias for the Peripheral Access Crate, which provides low-level
// register access
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use rp_pico::hal::pac;
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// A shorter alias for the Hardware Abstraction Layer, which provides
// higher-level drivers.
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use rp_pico::hal;
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/// Entry point to our bare-metal application.
///
/// The `#[entry]` macro ensures the Cortex-M start-up code calls this function
/// as soon as all global variables are initialised.
///
/// The function configures the RP2040 peripherals, then blinks the LED in an
/// infinite loop.
#[entry]
fn main() -> ! {
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// Grab our singleton objects
let mut pac = pac::Peripherals::take().unwrap();
let core = pac::CorePeripherals::take().unwrap();
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// Set up the watchdog driver - needed by the clock setup code
let mut watchdog = hal::Watchdog::new(pac.WATCHDOG);
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// Configure the clocks
//
// The default is to generate a 125 MHz system clock
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let clocks = hal::clocks::init_clocks_and_plls(
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rp_pico::XOSC_CRYSTAL_FREQ,
pac.XOSC,
pac.CLOCKS,
pac.PLL_SYS,
pac.PLL_USB,
&mut pac.RESETS,
&mut watchdog,
)
.ok()
.unwrap();
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// The delay object lets us wait for specified amounts of time (in
// milliseconds)
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let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().integer());
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// The single-cycle I/O block controls our GPIO pins
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let sio = hal::Sio::new(pac.SIO);
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// Set the pins up according to their function on this particular board
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let pins = rp_pico::Pins::new(
pac.IO_BANK0,
pac.PADS_BANK0,
sio.gpio_bank0,
&mut pac.RESETS,
);
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// Set the LED to be an output
let mut led_pin = pins.led.into_push_pull_output();
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// Blink the LED at 1 Hz
loop {
led_pin.set_high().unwrap();
delay.delay_ms(500);
led_pin.set_low().unwrap();
delay.delay_ms(500);
}
}
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// End of file