49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
use crate::input_device::InputDevice;
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use crate::protocol::{InputEvent, Key};
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const UART_BASE: usize = 0x10000000;
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const UART_LSR: usize = 5;
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pub struct UartInputDevice {
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base: usize,
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}
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impl UartInputDevice {
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pub fn new() -> Self {
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Self { base: UART_BASE }
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}
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fn read_byte(&self) -> Option<u8> {
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let lsr = unsafe { core::ptr::read_volatile((self.base + UART_LSR) as *const u8) };
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if lsr & 1 != 0 {
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Some(unsafe { core::ptr::read_volatile(self.base as *const u8) })
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} else {
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None
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}
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}
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fn byte_to_key(byte: u8) -> Key {
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match byte {
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b'w' | b'W' => Key::Up,
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b's' | b'S' => Key::Down,
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b'a' | b'A' => Key::Left,
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b'd' | b'D' => Key::Right,
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b'\r' | b'\n' => Key::Enter,
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0x1B => Key::Escape,
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c => Key::Char(c),
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}
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}
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}
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impl InputDevice for UartInputDevice {
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fn poll(&mut self) -> Option<InputEvent> {
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let byte = self.read_byte()?;
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Some(InputEvent::KeyDown(Self::byte_to_key(byte)))
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}
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fn has_event(&self) -> bool {
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let lsr = unsafe { core::ptr::read_volatile((self.base + UART_LSR) as *const u8) };
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lsr & 1 != 0
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}
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}
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