1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#![allow(dead_code)]
pub trait Controller {
fn read(&self) -> u8;
fn write(&self, data: u8);
}
pub mod stdctl {
use core::cell::Cell;
use controller::Controller;
#[derive(Copy, Clone)]
pub enum Button {
A = 0,
B = 1,
Select = 2,
Start = 3,
Up = 4,
Down = 5,
Left = 6,
Right = 7,
Null = 8,
}
pub struct Joystick {
strobe: Cell<bool>,
reg: Cell<u8>,
back_reg: Cell<u8>
}
impl Joystick {
pub fn new() -> Self {
Joystick{reg: Cell::new(0), strobe: Cell::new(false), back_reg: Cell::new(0)}
}
pub fn set(&self, buttons: &[bool]) {
let mut reg = 0;
for (i, v) in buttons.iter().enumerate() {
if *v {
reg |= 1 << i;
}
}
self.reg.set(reg);
self.back_reg.set(reg);
}
}
impl Controller for Joystick {
fn read(&self) -> u8 {
let res = self.reg.get() & 1;
if !self.strobe.get() {
self.reg.set(self.reg.get() >> 1);
}
res
}
fn write(&self, data: u8) {
self.strobe.set(data & 1 == 1);
self.reg.set(self.back_reg.get());
}
}
}
|