examples/rp23/src/bin/uart.rs


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//! This example shows how to use UART (Universal asynchronous receiver-transmitter) in the RP2040 chip.
//!
//! No specific hardware is specified in this example. Only output on pin 0 is tested.
//! The Raspberry Pi Debug Probe (https://www.raspberrypi.com/products/debug-probe/) could be used
//! with its UART port.

#![no_std]
#![no_main]

use embassy_executor::Spawner;
use embassy_rp::block::ImageDef;
use embassy_rp::uart;
use {defmt_rtt as _, panic_probe as _};

#[link_section = ".start_block"]
#[used]
pub static IMAGE_DEF: ImageDef = ImageDef::secure_exe();

// Program metadata for `picotool info`
#[link_section = ".bi_entries"]
#[used]
pub static PICOTOOL_ENTRIES: [embassy_rp::binary_info::EntryAddr; 4] = [
    embassy_rp::binary_info::rp_program_name!(c"example"),
    embassy_rp::binary_info::rp_cargo_version!(),
    embassy_rp::binary_info::rp_program_description!(c"Blinky"),
    embassy_rp::binary_info::rp_program_build_attribute!(),
];

#[embassy_executor::main]
async fn main(_spawner: Spawner) {
    let p = embassy_rp::init(Default::default());
    let config = uart::Config::default();
    let mut uart = uart::Uart::new_blocking(p.UART1, p.PIN_4, p.PIN_5, config);
    uart.blocking_write("Hello World!\r\n".as_bytes()).unwrap();

    loop {
        uart.blocking_write("hello there!\r\n".as_bytes()).unwrap();
        cortex_m::asm::delay(1_000_000);
    }
}