Module rp2040_hal::uart

Expand description

Universal Asynchronous Receiver Transmitter (UART)

See Chapter 4 Section 2 of the datasheet for more details

Usage

See examples/uart.rs for a more complete example

use rp2040_hal::{Clock, clocks::init_clocks_and_plls, gpio::{Pins, FunctionUart}, pac, sio::Sio, uart::{self, DataBits, StopBits, UartConfig, UartPeripheral}, watchdog::Watchdog};
use fugit::RateExtU32;

const XOSC_CRYSTAL_FREQ: u32 = 12_000_000; // Typically found in BSP crates

let mut peripherals = pac::Peripherals::take().unwrap();
let sio = Sio::new(peripherals.SIO);
let pins = Pins::new(peripherals.IO_BANK0, peripherals.PADS_BANK0, sio.gpio_bank0, &mut peripherals.RESETS);
let mut watchdog = Watchdog::new(peripherals.WATCHDOG);
let mut clocks = init_clocks_and_plls(XOSC_CRYSTAL_FREQ, peripherals.XOSC, peripherals.CLOCKS, peripherals.PLL_SYS, peripherals.PLL_USB, &mut peripherals.RESETS, &mut watchdog).ok().unwrap();

// Set up UART on GP0 and GP1 (Pico pins 1 and 2)
let pins = (
    pins.gpio0.into_mode::<FunctionUart>(),
    pins.gpio1.into_mode::<FunctionUart>(),
);
// Need to perform clock init before using UART or it will freeze.
let uart = UartPeripheral::new(peripherals.UART0, pins, &mut peripherals.RESETS)
    .enable(
        UartConfig::new(9600.Hz(), DataBits::Eight, None, StopBits::One),
        clocks.peripheral_clock.freq(),
    ).unwrap();

uart.write_full_blocking(b"Hello World!\r\n");