nrf52840_dongle/
io.rs
1use core::fmt::Write;
6use core::panic::PanicInfo;
7use kernel::debug;
8use kernel::debug::IoWrite;
9use kernel::hil::led;
10use kernel::hil::uart::{self, Configure};
11use nrf52840::gpio::Pin;
12use nrf52840::uart::{Uarte, UARTE0_BASE};
13
14use crate::CHIP;
15use crate::PROCESSES;
16use crate::PROCESS_PRINTER;
17
18struct Writer {
19 initialized: bool,
20}
21
22static mut WRITER: Writer = Writer { initialized: false };
23
24impl Write for Writer {
25 fn write_str(&mut self, s: &str) -> ::core::fmt::Result {
26 self.write(s.as_bytes());
27 Ok(())
28 }
29}
30
31impl IoWrite for Writer {
32 fn write(&mut self, buf: &[u8]) -> usize {
33 let uart = Uarte::new(UARTE0_BASE);
37 if !self.initialized {
38 self.initialized = true;
39 let _ = uart.configure(uart::Parameters {
40 baud_rate: 115200,
41 stop_bits: uart::StopBits::One,
42 parity: uart::Parity::None,
43 hw_flow_control: false,
44 width: uart::Width::Eight,
45 });
46 }
47 for &c in buf {
48 unsafe {
49 uart.send_byte(c);
50 }
51 while !uart.tx_ready() {}
52 }
53 buf.len()
54 }
55}
56
57#[cfg(not(test))]
58#[no_mangle]
59#[panic_handler]
60pub unsafe fn panic_fmt(pi: &PanicInfo) -> ! {
62 use core::ptr::{addr_of, addr_of_mut};
65 let led_kernel_pin = &nrf52840::gpio::GPIOPin::new(Pin::P0_06);
66 let led = &mut led::LedLow::new(led_kernel_pin);
67 let writer = &mut *addr_of_mut!(WRITER);
68 debug::panic(
69 &mut [led],
70 writer,
71 pi,
72 &cortexm4::support::nop,
73 &*addr_of!(PROCESSES),
74 &*addr_of!(CHIP),
75 &*addr_of!(PROCESS_PRINTER),
76 )
77}