rp-hal-boards/rp2040-hal/examples/gpio_in_out.rs

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//! # GPIO 'Blinky' Example
//!
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//! This application demonstrates how to control a GPIO pin on the RP2040.
//!
//! It may need to be adapted to your particular board layout and/or pin assignment.
//!
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//! See the `Cargo.toml` file for Copyright and license details.
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#![no_std]
#![no_main]
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// Ensure we halt the program on panic (if we don't mention this crate it won't
// be linked)
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use panic_halt as _;
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// Alias for our HAL crate
use rp2040_hal as hal;
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// A shorter alias for the Peripheral Access Crate, which provides low-level
// register access
use hal::pac;
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// Some traits we need
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use embedded_hal::digital::v2::InputPin;
use embedded_hal::digital::v2::OutputPin;
/// The linker will place this boot block at the start of our program image. We
/// need this to help the ROM bootloader get our code up and running.
#[link_section = ".boot2"]
#[used]
pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_GENERIC_03H;
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/// External high-speed crystal on the Raspberry Pi Pico board is 12 MHz. Adjust
/// if your board has a different frequency
const XTAL_FREQ_HZ: u32 = 12_000_000u32;
/// Entry point to our bare-metal application.
///
/// The `#[rp2040_hal::entry]` macro ensures the Cortex-M start-up code calls this function
/// as soon as all global variables and the spinlock are initialised.
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///
/// The function configures the RP2040 peripherals, then toggles a GPIO pin in
/// an infinite loop. If there is an LED connected to that pin, it will blink.
#[rp2040_hal::entry]
fn main() -> ! {
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// Grab our singleton objects
let mut pac = pac::Peripherals::take().unwrap();
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// Set up the watchdog driver - needed by the clock setup code
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let mut watchdog = hal::Watchdog::new(pac.WATCHDOG);
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// Configure the clocks
let _clocks = hal::clocks::init_clocks_and_plls(
XTAL_FREQ_HZ,
pac.XOSC,
pac.CLOCKS,
pac.PLL_SYS,
pac.PLL_USB,
&mut pac.RESETS,
&mut watchdog,
)
.ok()
.unwrap();
// 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 to their default state
let pins = hal::gpio::Pins::new(
pac.IO_BANK0,
pac.PADS_BANK0,
sio.gpio_bank0,
&mut pac.RESETS,
);
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// Configure GPIO 25 as an output
let mut out_pin = pins.gpio25.into_push_pull_output();
// Configure GPIO 23 as an input
let in_pin = pins.gpio23.into_pull_down_input();
// Output is the opposite of the input
loop {
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if in_pin.is_low().unwrap() {
out_pin.set_high().unwrap();
} else {
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out_pin.set_low().unwrap();
}
}
}
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// End of file