mirror of
https://github.com/italicsjenga/rp-hal-boards.git
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113 lines
3.5 KiB
Rust
113 lines
3.5 KiB
Rust
//! # Watchdog Example
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//!
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//! This application demonstrates how to use the RP2040 Watchdog.
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//!
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//! It may need to be adapted to your particular board layout and/or pin assignment.
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//!
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//! See the `Cargo.toml` file for Copyright and licence details.
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#![no_std]
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#![no_main]
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// The macro for our start-up function
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use cortex_m_rt::entry;
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// Ensure we halt the program on panic (if we don't mention this crate it won't
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// be linked)
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use panic_halt as _;
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// Alias for our HAL crate
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use rp2040_hal as hal;
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// A shorter alias for the Peripheral Access Crate, which provides low-level
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// register access
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use hal::pac;
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// Traits we need
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use embedded_hal::digital::v2::OutputPin;
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use embedded_hal::watchdog::{Watchdog, WatchdogEnable};
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use embedded_time::duration::Extensions;
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use embedded_time::fixed_point::FixedPoint;
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use rp2040_hal::clocks::Clock;
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/// The linker will place this boot block at the start of our program image. We
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// need this to help the ROM bootloader get our code up and running.
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#[link_section = ".boot2"]
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#[used]
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pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER;
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/// External high-speed crystal on the Raspberry Pi Pico board is 12 MHz. Adjust
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/// if your board has a different frequency
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const XTAL_FREQ_HZ: u32 = 12_000_000u32;
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/// Entry point to our bare-metal application.
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///
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/// The `#[entry]` macro ensures the Cortex-M start-up code calls this function
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/// as soon as all global variables are initialised.
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///
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/// The function configures the RP2040 peripherals, then toggles a GPIO pin in
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/// an infinite loop. If there is an LED connected to that pin, it will blink.
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#[entry]
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fn main() -> ! {
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// Grab our singleton objects
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let mut pac = pac::Peripherals::take().unwrap();
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let core = pac::CorePeripherals::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::Watchdog::new(pac.WATCHDOG);
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// Configure the clocks
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let clocks = hal::clocks::init_clocks_and_plls(
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XTAL_FREQ_HZ,
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pac.XOSC,
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pac.CLOCKS,
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pac.PLL_SYS,
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pac.PLL_USB,
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&mut pac.RESETS,
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&mut watchdog,
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)
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.ok()
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.unwrap();
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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::Sio::new(pac.SIO);
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// Set the pins to their default state
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let pins = hal::gpio::Pins::new(
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pac.IO_BANK0,
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pac.PADS_BANK0,
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sio.gpio_bank0,
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&mut pac.RESETS,
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);
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// Configure an LED so we can show the current state of the watchdog
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let mut led_pin = pins.gpio25.into_push_pull_output();
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// Set the LED high for 2 seconds so we know when we're about to start the watchdog
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led_pin.set_high().unwrap();
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delay.delay_ms(2000);
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// Set to watchdog to reset if it's not reloaded within 1.05 seconds, and start it
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watchdog.start(1_050_000u32.microseconds());
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// Blink once a second for 5 seconds, refreshing the watchdog timer once a second to avoid a reset
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for _ in 1..=5 {
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led_pin.set_low().unwrap();
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delay.delay_ms(500);
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led_pin.set_high().unwrap();
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delay.delay_ms(500);
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watchdog.feed();
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}
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// Blink 10 times per second, not feeding the watchdog.
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// The processor should reset in 1.05 seconds, or 5 blinks time
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loop {
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led_pin.set_low().unwrap();
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delay.delay_ms(100);
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led_pin.set_high().unwrap();
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delay.delay_ms(100);
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}
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}
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