target/rp/console_backend.rs

// Copyright 2025 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License

#![no_std]

use embedded_io::{ErrorType, Write};
use rp235x_hal::{
    gpio::{bank0::Gpio12, bank0::Gpio13, FunctionUart, Pin, PullDown},
    pac::UART0,
    uart::{self, UartPeripheral},
};
use spinlock::SpinLock;

pub type ConsoleUart = UartPeripheral<
    uart::Enabled,
    UART0,
    (
        Pin<Gpio12, FunctionUart, PullDown>,
        Pin<Gpio13, FunctionUart, PullDown>,
    ),
>;

static UART: SpinLock<Option<ConsoleUart>> = SpinLock::new(None);

pub struct ConsoleBackend {}

impl ErrorType for ConsoleBackend {
    type Error = pw_status::Error;
}

impl Write for ConsoleBackend {
    fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
        let mut uart = UART.lock();
        match &mut (*uart) {
            Some(uart) => uart.write(buf).map_err(|_| Self::Error::Unknown),
            None => Ok(buf.len()),
        }
    }

    fn flush(&mut self) -> Result<(), Self::Error> {
        Ok(())
    }
}

pub fn register_uart(val: ConsoleUart) {
    let mut uart = UART.lock();
    *uart = Some(val)
}