mirror of
https://github.com/italicsjenga/rp-hal-boards.git
synced 2024-12-26 22:01:31 +11:00
0e7abdc705
* Add boot2 feature. Add boot2 linkage into each BSP optional on feature * Enable boot2 feature in BSPs by default. Remove boot2 decl from all BSP examples * Add EXTERN in memory.x for BOOT2_FIRMWARE, rename bootloader static slice to BOOT2_FIRMWARE * Update new examples and itsy_bitsy BSP to use boot2 feature * Remove boot2 as a dev-dependency for the BSPs, no longer needed * Add no_mangle BOOT2_FIRMWARE to adafruit_macropad * Fix itsy-bitsy blinky - it wasn't using the BSP, so it didn't get BOOT2_FIRMWARE linked in
89 lines
2.4 KiB
Rust
89 lines
2.4 KiB
Rust
//! # Pico Countdown Blinky Example
|
|
//!
|
|
//! Blinks the LED on a Pico board, using an RP2040 Timer in Count-down mode.
|
|
//!
|
|
//! 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]
|
|
|
|
// The macro for our start-up function
|
|
use cortex_m_rt::entry;
|
|
|
|
use cortex_m::prelude::*;
|
|
|
|
// GPIO traits
|
|
use embedded_hal::digital::v2::OutputPin;
|
|
|
|
// Traits for converting integers to amounts of time
|
|
use embedded_time::duration::Extensions;
|
|
|
|
// Ensure we halt the program on panic (if we don't mention this crate it won't
|
|
// be linked)
|
|
use panic_halt as _;
|
|
|
|
// A shorter alias for the Peripheral Access Crate, which provides low-level
|
|
// register access
|
|
use pico::hal::pac;
|
|
|
|
// A shorter alias for the Hardware Abstraction Layer, which provides
|
|
// higher-level drivers.
|
|
use pico::hal;
|
|
|
|
#[entry]
|
|
fn main() -> ! {
|
|
// Grab our singleton objects
|
|
let mut pac = pac::Peripherals::take().unwrap();
|
|
|
|
// Set up the watchdog driver - needed by the clock setup code
|
|
let mut watchdog = hal::watchdog::Watchdog::new(pac.WATCHDOG);
|
|
|
|
// Configure the clocks
|
|
//
|
|
// The default is to generate a 125 MHz system clock
|
|
let _clocks = hal::clocks::init_clocks_and_plls(
|
|
pico::XOSC_CRYSTAL_FREQ,
|
|
pac.XOSC,
|
|
pac.CLOCKS,
|
|
pac.PLL_SYS,
|
|
pac.PLL_USB,
|
|
&mut pac.RESETS,
|
|
&mut watchdog,
|
|
)
|
|
.ok()
|
|
.unwrap();
|
|
|
|
// Configure the Timer peripheral in count-down mode
|
|
let timer = hal::timer::Timer::new(pac.TIMER, &mut pac.RESETS);
|
|
let mut count_down = timer.count_down();
|
|
|
|
// The single-cycle I/O block controls our GPIO pins
|
|
let sio = hal::sio::Sio::new(pac.SIO);
|
|
|
|
// Set the pins up according to their function on this particular board
|
|
let pins = pico::Pins::new(
|
|
pac.IO_BANK0,
|
|
pac.PADS_BANK0,
|
|
sio.gpio_bank0,
|
|
&mut pac.RESETS,
|
|
);
|
|
|
|
let mut led_pin = pins.led.into_push_pull_output();
|
|
|
|
// Blink the LED at 1 Hz
|
|
loop {
|
|
// LED on, and wait for 500ms
|
|
led_pin.set_high().unwrap();
|
|
count_down.start(500.milliseconds());
|
|
let _ = nb::block!(count_down.wait());
|
|
|
|
// LED off, and wait for 500ms
|
|
led_pin.set_low().unwrap();
|
|
count_down.start(500.milliseconds());
|
|
let _ = nb::block!(count_down.wait());
|
|
}
|
|
}
|