rp-hal-boards/boards/pico/examples/pico_gpio_in_out.rs
Hmvp ffa97842e2
Improve clock frequency stuff for uninitialized clocks and add some examples (#64)
* Improve clock frequency stuff for uninitialized clocks

- Made clocks singletons so the frequency handling actually works as expected
- Added initial frequencies
- Improved the docs
- Added a Clock trait

* Add pico examples.

These have the benefit of knowing which external crystal is attached.
Even though it always should be a 12 MHz crystal.
Thus we can setup the clocks properly

I also changed the rp2040 examples to work out of the box for pico boards since that will probably be used most of the time
2021-07-26 20:24:58 +10:00

42 lines
1 KiB
Rust

//! Toggle LED based on GPIO input
//!
//! This will control an LED on GP25 based on a button hooked up to GP15. The button should be tied
//! to ground, as the input pin is pulled high internally by this example. When the button is
//! pressed, the LED will turn off.
#![no_std]
#![no_main]
use cortex_m_rt::entry;
use embedded_hal::digital::v2::{InputPin, OutputPin};
use hal::pac;
use hal::sio::Sio;
use panic_halt as _;
use pico::{hal, Pins};
#[link_section = ".boot2"]
#[used]
pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER;
#[entry]
fn main() -> ! {
let mut pac = pac::Peripherals::take().unwrap();
let sio = Sio::new(pac.SIO);
let pins = Pins::new(
pac.IO_BANK0,
pac.PADS_BANK0,
sio.gpio_bank0,
&mut pac.RESETS,
);
let mut led_pin = pins.led.into_push_pull_output();
let button_pin = pins.bootsel.into_pull_down_input();
loop {
if button_pin.is_low().unwrap() {
led_pin.set_high().unwrap();
} else {
led_pin.set_low().unwrap();
}
}
}