msp_exp432p401r/
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 crate::CHIP;
6use crate::PROCESSES;
7use crate::PROCESS_PRINTER;
8
9use core::fmt::Write;
10use core::panic::PanicInfo;
11use core::ptr::addr_of;
12use core::ptr::addr_of_mut;
13use kernel::debug;
14use kernel::debug::IoWrite;
15use kernel::hil::led;
16use msp432::gpio::IntPinNr;
17use msp432::wdt::Wdt;
18
19/// Uart is used by kernel::debug to panic message to the serial port.
20pub struct Uart {}
21
22/// Global static for debug writer
23pub static mut UART: Uart = Uart {};
24
25impl Write for Uart {
26    fn write_str(&mut self, s: &str) -> ::core::fmt::Result {
27        self.write(s.as_bytes());
28        Ok(())
29    }
30}
31
32impl IoWrite for Uart {
33    fn write(&mut self, buf: &[u8]) -> usize {
34        let uart0 = msp432::uart::Uart::new(msp432::usci::USCI_A0_BASE, 0, 1, 1, 1);
35        uart0.transmit_sync(buf);
36        buf.len()
37    }
38}
39
40/// Panic handler
41#[no_mangle]
42#[panic_handler]
43pub unsafe fn panic_fmt(info: &PanicInfo) -> ! {
44    const LED1_PIN: IntPinNr = IntPinNr::P01_0;
45    let gpio_pin = msp432::gpio::IntPin::new(LED1_PIN);
46    let led = &mut led::LedHigh::new(&gpio_pin);
47    let writer = &mut *addr_of_mut!(UART);
48    let wdt = Wdt::new();
49
50    wdt.disable();
51    debug::panic(
52        &mut [led],
53        writer,
54        info,
55        &cortexm4::support::nop,
56        &*addr_of!(PROCESSES),
57        &*addr_of!(CHIP),
58        &*addr_of!(PROCESS_PRINTER),
59    )
60}