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

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//! # UART Example
//!
//! This application demonstrates how to use the UART Driver to talk to a serial
//! connection.
//!
//! 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)
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;
// Some traits we need
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use core::fmt::Write;
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use embedded_time::fixed_point::FixedPoint;
use rp2040_hal::clocks::Clock;
/// 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.
#[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 writes to the UART in
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/// an infinite loop.
#[rp2040_hal::entry]
fn main() -> ! {
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// Grab our singleton objects
let mut pac = pac::Peripherals::take().unwrap();
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let core = pac::CorePeripherals::take().unwrap();
// 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();
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let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().integer());
// 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,
);
let uart_pins = (
// UART TX (characters sent from RP2040) on pin 1 (GPIO0)
pins.gpio0.into_mode::<hal::gpio::FunctionUart>(),
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// UART RX (characters received by RP2040) on pin 2 (GPIO1)
pins.gpio1.into_mode::<hal::gpio::FunctionUart>(),
);
let mut uart = hal::uart::UartPeripheral::new(pac.UART0, uart_pins, &mut pac.RESETS)
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.enable(
hal::uart::common_configs::_9600_8_N_1,
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clocks.peripheral_clock.freq(),
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)
.unwrap();
uart.write_full_blocking(b"UART example\r\n");
let mut value = 0u32;
loop {
writeln!(uart, "value: {:02}\r", value).unwrap();
delay.delay_ms(1000);
value += 1
}
}
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// End of file