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use core::fmt;
use nb::block;
use riscv::interrupt;
use e310x_hal::{
serial::{Serial, Tx, Rx},
gpio::gpio0::{Pin17, Pin16},
time::Bps,
clock::Clocks,
e310x::UART0,
prelude::*
};
static mut STDOUT: Option<SerialWrapper> = None;
struct SerialWrapper(Tx<UART0>);
impl core::fmt::Write for SerialWrapper {
fn write_str(&mut self, s: &str) -> fmt::Result {
for byte in s.as_bytes() {
if *byte == '\n' as u8 {
let res = block!(self.0.write('\r' as u8));
if res.is_err() {
return Err(::core::fmt::Error);
}
}
let res = block!(self.0.write(*byte));
if res.is_err() {
return Err(::core::fmt::Error);
}
}
Ok(())
}
}
pub fn configure<X, Y>(
uart: UART0, tx: Pin17<X>, rx: Pin16<Y>,
baud_rate: Bps, clocks: Clocks
) -> Rx<UART0> {
let tx = tx.into_iof0();
let rx = rx.into_iof0();
let serial = Serial::new(uart, (tx, rx), baud_rate, clocks);
let (tx, rx) = serial.split();
interrupt::free(|_| {
unsafe {
STDOUT.replace(SerialWrapper(tx));
}
});
return rx;
}
pub fn write_str(s: &str) {
interrupt::free(|_| unsafe {
if let Some(stdout) = STDOUT.as_mut() {
let _ = stdout.write_str(s);
}
})
}
pub fn write_fmt(args: fmt::Arguments) {
interrupt::free(|_| unsafe {
if let Some(stdout) = STDOUT.as_mut() {
let _ = stdout.write_fmt(args);
}
})
}
#[macro_export]
macro_rules! sprint {
($s:expr) => {
$crate::stdout::write_str($s)
};
($($tt:tt)*) => {
$crate::stdout::write_fmt(format_args!($($tt)*))
};
}
#[macro_export]
macro_rules! sprintln {
() => {
$crate::stdout::write_str("\n")
};
($s:expr) => {
$crate::stdout::write_str(concat!($s, "\n"))
};
($s:expr, $($tt:tt)*) => {
$crate::stdout::write_fmt(format_args!(concat!($s, "\n"), $($tt)*))
};
}