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use crate::*;
use chrono::prelude::*;
pub struct ClockDevice {
pub epoch: Instant,
pub uptime_read: u16,
pub t1: CountdownTimer,
pub t2: CountdownTimer,
pub t3: CountdownTimer,
pub t4: CountdownTimer,
}
impl Device for ClockDevice {
fn read(&mut self, port: u8) -> u8 {
match port {
0x0 => Local::now().year().saturating_sub(2000) as u8,
0x1 => Local::now().month().saturating_sub(1) as u8,
0x2 => Local::now().day().saturating_sub(1) as u8,
0x3 => Local::now().hour() as u8,
0x4 => Local::now().minute() as u8,
0x5 => Local::now().second() as u8,
0x6 => { self.uptime_read = self.uptime() as u16;
read_h!(self.uptime_read) },
0x7 => read_l!(self.uptime_read),
0x8 => { self.t1.update(); read_h!(self.t1.read) },
0x9 => read_l!(self.t1.read),
0xA => { self.t2.update(); read_h!(self.t2.read) },
0xB => read_l!(self.t2.read),
0xC => { self.t3.update(); read_h!(self.t3.read) },
0xD => read_l!(self.t3.read),
0xE => { self.t4.update(); read_h!(self.t4.read) },
0xF => read_l!(self.t4.read),
_ => unreachable!(),
}
}
fn write(&mut self, port: u8, value: u8) -> Option<Signal> {
match port {
0x0 => (),
0x1 => (),
0x2 => (),
0x3 => (),
0x4 => (),
0x5 => (),
0x6 => (),
0x7 => (),
0x8 => write_h!(self.t1.write, value),
0x9 => { write_l!(self.t1.write, value); self.t1.commit() },
0xA => write_h!(self.t2.write, value),
0xB => { write_l!(self.t2.write, value); self.t2.commit() },
0xC => write_h!(self.t3.write, value),
0xD => { write_l!(self.t3.write, value); self.t3.commit() },
0xE => write_h!(self.t4.write, value),
0xF => { write_l!(self.t4.write, value); self.t4.commit() },
_ => unreachable!(),
};
return None;
}
fn wake(&mut self) -> bool {
let t1 = self.t1.wake();
let t2 = self.t2.wake();
let t3 = self.t3.wake();
let t4 = self.t4.wake();
return t1 | t2 | t3 | t4;
}
fn reset(&mut self) {
self.epoch = Instant::now();
self.uptime_read = 0;
self.t1.reset();
self.t2.reset();
self.t3.reset();
self.t4.reset();
}
}
impl ClockDevice {
pub fn new() -> Self {
Self {
epoch: Instant::now(),
uptime_read: 0,
t1: CountdownTimer::new(),
t2: CountdownTimer::new(),
t3: CountdownTimer::new(),
t4: CountdownTimer::new(),
}
}
pub fn uptime(&self) -> u64 {
(self.epoch.elapsed().as_nanos() * 256 / 1_000_000_000) as u64
}
}
pub struct CountdownTimer {
pub end: Option<Instant>,
pub read: u16,
pub write: u16,
pub wake: bool,
}
impl CountdownTimer {
pub fn new() -> Self {
Self {
end: None,
read: 0,
write: 0,
wake: false,
}
}
pub fn reset(&mut self) {
self.end = None;
self.read = 0;
self.write = 0;
self.wake = false;
}
pub fn wake(&mut self) -> bool {
if let Some(end) = self.end {
if end <= Instant::now() {
self.end = None;
self.wake = true;
}
}
std::mem::take(&mut self.wake)
}
pub fn update(&mut self) {
if let Some(end) = self.end {
let now = Instant::now();
if end > now {
let nanos = (end - now).as_nanos();
self.read = (nanos * 256 / 1_000_000_000) as u16;
} else {
self.read = 0;
self.end = None;
self.wake = true;
}
} else {
self.read = 0;
}
}
pub fn commit(&mut self) {
if self.write > 0 {
let nanos = (self.write as u64) * 1_000_000_000 / 256;
self.end = Some(Instant::now() + Duration::from_nanos(nanos));
} else {
self.end = None;
}
}
}
|
