lora_things_plus/
io.rs

1// Licensed under the Apache License, Version 2.0 or the MIT License.
2// SPDX-License-Identifier: Apache-2.0 OR MIT
3// Copyright Tock Contributors 2022.
4
5use core::fmt::Write;
6use core::panic::PanicInfo;
7use core::ptr::addr_of_mut;
8
9use kernel::debug;
10use kernel::debug::IoWrite;
11use kernel::hil::led;
12
13/// Writer is used by kernel::debug to panic message to the serial port.
14pub struct Writer {}
15
16/// Global static for debug writer
17pub static mut WRITER: Writer = Writer {};
18
19impl Write for Writer {
20    fn write_str(&mut self, s: &str) -> ::core::fmt::Result {
21        self.write(s.as_bytes());
22        Ok(())
23    }
24}
25
26impl IoWrite for Writer {
27    fn write(&mut self, buf: &[u8]) -> usize {
28        let uart = apollo3::uart::Uart::new_uart_0(); // Aliases memory for uart0. Okay bc we are panicking.
29        uart.transmit_sync(buf);
30        buf.len()
31    }
32}
33
34/// Panic handler.
35#[panic_handler]
36pub unsafe fn panic_fmt(info: &PanicInfo) -> ! {
37    // just create a new pin reference here instead of using global
38    let led_pin = &mut apollo3::gpio::GpioPin::new(
39        kernel::utilities::StaticRef::new(
40            apollo3::gpio::GPIO_BASE_RAW as *const apollo3::gpio::GpioRegisters,
41        ),
42        apollo3::gpio::Pin::Pin26,
43    );
44    let led = &mut led::LedLow::new(led_pin);
45    let writer = &mut *addr_of_mut!(WRITER);
46
47    debug::panic(
48        &mut [led],
49        writer,
50        info,
51        &cortexm4::support::nop,
52        crate::PANIC_RESOURCES.get(),
53    )
54}
lora_things_plus/io.rs

lora_things_plus/
io.rs
