esp32_c3_board/
io.rs

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// Licensed under the Apache License, Version 2.0 or the MIT License.
// SPDX-License-Identifier: Apache-2.0 OR MIT
// Copyright Tock Contributors 2022.

use core::fmt::Write;
use core::panic::PanicInfo;
use core::ptr::addr_of;
use core::str;
use kernel::debug;
use kernel::debug::IoWrite;

use crate::CHIP;
use crate::PROCESSES;
use crate::PROCESS_PRINTER;

struct Writer {}

static mut WRITER: Writer = Writer {};

impl Write for Writer {
    fn write_str(&mut self, s: &str) -> ::core::fmt::Result {
        self.write(s.as_bytes());
        Ok(())
    }
}

impl IoWrite for Writer {
    fn write(&mut self, buf: &[u8]) -> usize {
        let uart = esp32::uart::Uart::new(esp32::uart::UART0_BASE);
        uart.disable_tx_interrupt();
        uart.disable_rx_interrupt();
        uart.transmit_sync(buf);
        buf.len()
    }
}

/// Panic handler.
#[cfg(not(test))]
#[no_mangle]
#[panic_handler]
pub unsafe fn panic_fmt(pi: &PanicInfo) -> ! {
    use core::ptr::addr_of_mut;

    let writer = &mut *addr_of_mut!(WRITER);

    debug::panic_banner(writer, pi);
    debug::panic_cpu_state(&*addr_of!(CHIP), writer);
    debug::panic_process_info(&*addr_of!(PROCESSES), &*addr_of!(PROCESS_PRINTER), writer);

    loop {
        rv32i::support::nop();
    }
}

#[cfg(test)]
#[no_mangle]
#[panic_handler]
pub unsafe fn panic_fmt(pi: &PanicInfo) -> ! {
    use core::ptr::addr_of_mut;

    let writer = &mut *addr_of_mut!(WRITER);

    debug::panic_print(
        writer,
        pi,
        &rv32i::support::nop,
        &*addr_of!(PROCESSES),
        &*addr_of!(CHIP),
        &*addr_of!(PROCESS_PRINTER),
    );

    let _ = writeln!(writer, "{}", pi);
    loop {}
}