Kernel library crate for xous
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
xous-kernel/src/debug.rs

95 lines
2.3 KiB

use crate::definitions::{XousError, MemoryAddress, MemorySize};
// use crate::syscalls::sys_memory_allocate;
use core::fmt::{Error, Write};
#[macro_export]
macro_rules! print
{
($($args:tt)+) => ({
use core::fmt::Write;
let _ = write!(crate::debug::DEFAULT_UART, $($args)+);
});
}
#[macro_export]
macro_rules! println
{
() => ({
print!("\r\n")
});
($fmt:expr) => ({
print!(concat!($fmt, "\r\n"))
});
($fmt:expr, $($args:tt)+) => ({
print!(concat!($fmt, "\r\n"), $($args)+)
});
}
pub struct Uart {
base: *mut usize,
}
pub const DEFAULT_UART: Uart = Uart {
base: 0xE000_1800 as *mut usize,
};
impl Uart {
pub fn init(&self) -> Result<(), XousError> {
// sys_memory_allocate(
// Some(MemoryAddress::new(0xe0001800).unwrap()),
// Some(MemoryAddress::new(0xe0001800).unwrap()),
// MemorySize::new(4096).unwrap(),
// )
// .expect("Couldn't identity map");
Ok(())
}
pub fn enable_rx(self) {
unsafe {
self.base
.add(5)
.write_volatile(self.base.add(5).read_volatile() | 2)
};
}
pub fn putc(&self, c: u8) {
unsafe {
// Wait until TXFULL is `0`
while self.base.add(1).read_volatile() != 0 {
()
}
self.base.add(0).write_volatile(c as usize)
};
}
pub fn getc(&self) -> Option<u8> {
unsafe {
// If EV_PENDING_RX is 1, return the pending character.
// Otherwise, return None.
match self.base.add(4).read_volatile() & 2 {
0 => None,
ack => {
let c = Some(self.base.add(0).read_volatile() as u8);
self.base.add(4).write_volatile(ack);
c
}
}
}
}
}
pub fn irq(irq_number: usize) {
println!(
"Interrupt {}: Key pressed: {}",
irq_number,
DEFAULT_UART.getc().unwrap() as char
);
}
impl Write for Uart {
fn write_str(&mut self, s: &str) -> Result<(), Error> {
for c in s.bytes() {
self.putc(c);
}
Ok(())
}
}