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use crate::{Cursor, CursorBlink, Display};
pub struct DisplayMode {
pub cursor_visibility: Cursor,
pub cursor_blink: CursorBlink,
pub display: Display,
}
impl Default for DisplayMode {
fn default() -> DisplayMode {
DisplayMode {
cursor_visibility: Cursor::Visible,
cursor_blink: CursorBlink::On,
display: Display::On,
}
}
}
impl DisplayMode {
pub fn as_byte(&self) -> u8 {
let cursor_blink_bits = match self.cursor_blink {
CursorBlink::On => 0b0000_0001,
CursorBlink::Off => 0,
};
let cursor_visible_bits = match self.cursor_visibility {
Cursor::Visible => 0b0000_0010,
Cursor::Invisible => 0,
};
let display_bits = match self.display {
Display::On => 0b0000_0100,
Display::Off => 0,
};
0b0000_1000 | cursor_visible_bits | cursor_blink_bits | display_bits
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn cursor_visible() {
let dm = DisplayMode {
cursor_visibility: Cursor::Visible,
..Default::default()
};
assert!(dm.as_byte() & 0b0000_0010 != 0);
let dm = DisplayMode {
cursor_visibility: Cursor::Invisible,
..Default::default()
};
assert!(dm.as_byte() & 0b0000_0010 == 0);
}
#[test]
fn cursor_blink() {
let dm = DisplayMode {
cursor_blink: CursorBlink::On,
..Default::default()
};
assert!(dm.as_byte() & 0b0000_0001 != 0);
let dm = DisplayMode {
cursor_blink: CursorBlink::Off,
..Default::default()
};
assert!(dm.as_byte() & 0b0000_0001 == 0);
}
#[test]
fn display_visible() {
let dm = DisplayMode {
display: Display::On,
..Default::default()
};
assert!(dm.as_byte() & 0b0000_0100 != 0);
let dm = DisplayMode {
display: Display::Off,
..Default::default()
};
assert!(dm.as_byte() & 0b0000_0100 == 0);
}
}
|
