Node / public / precursor-lxmfchat.git / files / xous-core / kernel / src / platform / bao1x / uart.rs

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// SPDX-FileCopyrightText: 2020 Sean Cross <sean@xobs.io>

// SPDX-FileCopyrightText: 2022 Foundation Devices, Inc. <hello@foundationdevices.com>

// SPDX-FileCopyrightText: 2024 bunnie <bunnie@kosagi.com>

// SPDX-License-Identifier: Apache-2.0

// FIXME(static_mut_refs): Do not allow \\`static_mut_refs\\` lint

#![allow(static_mut_refs)]

#[cfg(feature = "bao1x")]

use utralib::generated::*;

#[cfg(feature = "bao1x")]

use xous_kernel::{MemoryFlags, MemoryType};

#[cfg(feature = "bao1x")]

use crate::{PID, io::SerialWrite, mem::MemoryManager};

/// UART virtual address.

///

/// See https://github.com/betrusted-io/xous-core/blob/master/docs/memory.md

#[cfg(feature = "bao1x")]

pub const UART_ADDR: usize = 0xffcf_0000;

/// UART instance.

///

/// Initialized by [\\`init\\`].

#[cfg(feature = "bao1x")]

pub static mut UART: Option<Uart> = None;

#[cfg(feature = "bao1x")]

pub fn init() {

// Map the UART peripheral.

MemoryManager::with_mut(|memory_manager| {

memory_manager

.map_range(

utra::duart::HW_DUART_BASE as *mut u8,

(UART_ADDR & !4095) as *mut u8,

4096,

PID::new(1).unwrap(),

MemoryFlags::R | MemoryFlags::W,

MemoryType::Default,

)

.expect("unable to map serial port")

});

let mut uart = Uart::new(UART_ADDR);

uart.init();

unsafe {

UART = Some(uart);

crate::debug::shell::init((&mut *(&raw mut UART)).as_mut().unwrap());

}

}

#[cfg(feature = "bao1x")]

pub struct Uart {

uart_csr: CSR<u32>,

}

#[cfg(feature = "bao1x")]

impl Uart {

pub fn new(addr: usize) -> Uart { Uart { uart_csr: CSR::new(addr as *mut u32) } }

pub fn init(&mut self) {

// duart requires no special initializations

}

}

#[cfg(feature = "bao1x")]

impl SerialWrite for Uart {

fn putc(&mut self, c: u8) {

while self.uart_csr.r(utra::duart::SFR_SR) != 0 {}

self.uart_csr.wo(utra::duart::SFR_TXD, c as u32);

}

}