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#![no_std]
use core::fmt::Write;
use core::panic::PanicInfo;
use rp2040_hal::pac as rp2040;
struct Cursor<'a> {
buf: &'a mut [u8],
pos: usize,
}
impl<'a> Cursor<'a> {
fn new(buf: &'a mut [u8]) -> Cursor<'a> {
Cursor { buf, pos: 0 }
}
}
impl<'a> core::fmt::Write for Cursor<'a> {
fn write_str(&mut self, s: &str) -> core::fmt::Result {
let len = s.as_bytes().len();
if len < self.buf.len() - self.pos {
self.buf[self.pos..self.pos + len].clone_from_slice(s.as_bytes());
self.pos += len;
Ok(())
} else {
Err(core::fmt::Error)
}
}
}
#[inline(never)]
#[panic_handler]
fn panic(info: &PanicInfo) -> ! {
cortex_m::interrupt::disable();
let p = unsafe { rp2040::Peripherals::steal() };
p.XIP_CTRL
.ctrl
.write(|w| w.power_down().clear_bit().en().clear_bit());
let buf: &mut [u8] = unsafe { core::slice::from_raw_parts_mut(0x15000000 as *mut u8, 0x4000) };
let mut cur = Cursor::new(buf);
write!(&mut cur, "{}\n\0", info).ok();
if !(p.XOSC.status.read().stable().bit()) {
p.XOSC.startup.write(|w| unsafe {
w.delay().bits((12_000 + 128) / 256)
});
p.XOSC.ctrl.write(|w| {
w.freq_range()
.variant(rp2040::xosc::ctrl::FREQ_RANGE_A::_1_15MHZ)
.enable()
.variant(rp2040::xosc::ctrl::ENABLE_A::ENABLE)
});
while !(p.XOSC.status.read().stable().bit()) {}
}
rp2040_hal::rom_data::reset_to_usb_boot(0, 0);
loop {}
}