hd44780_controller/command/
cursor_or_display_shift.rs

1use crate::device::*;
2
3use super::*;
4
5#[derive(Clone, Debug, Eq, PartialEq)]
6pub struct CursorOrDisplayShift {
7    pub mode: Mode,
8    pub direction: Direction,
9}
10
11#[derive(Copy, Clone, Debug, Eq, PartialEq)]
12pub enum Mode {
13    Cursor,
14    Display,
15}
16
17#[derive(Copy, Clone, Debug, Eq, PartialEq)]
18pub enum Direction {
19    Left,
20    Right,
21}
22
23impl CursorOrDisplayShift {
24    fn code(&self) -> u8 {
25        let mut code = 0x10;
26
27        if self.mode == Mode::Display {
28            code |= 0x1 << 3;
29        }
30        if self.direction == Direction::Right {
31            code |= 0x1 << 2;
32        }
33
34        code
35    }
36}
37
38impl SyncCommand for CursorOrDisplayShift {
39    type Ret = ();
40
41    type Err = super::Error;
42
43    fn execute<D: SyncDevice + ?Sized>(&self, dev: &mut D) -> Result<Self::Ret, Self::Err> {
44        dev.write_byte(RegisterSelectMode::Command, self.code())
45            .map_err(|_| super::Error::DeviceError)?;
46        dev.delay_us(50);
47
48        Ok(())
49    }
50}
51
52#[cfg(feature = "async")]
53#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
54impl AsyncCommand for CursorOrDisplayShift {
55    type Ret = ();
56
57    type Err = super::Error;
58
59    async fn execute_async<D: AsyncDevice + ?Sized>(
60        &self,
61        dev: &mut D,
62    ) -> Result<Self::Ret, Self::Err> {
63        dev.write_byte_async(RegisterSelectMode::Command, self.code())
64            .await
65            .map_err(|_| super::Error::DeviceError)?;
66        dev.delay_us_async(50).await;
67
68        Ok(())
69    }
70}
hd44780_controller/command/cursor_or_display_shift.rs

hd44780_controller/command/
cursor_or_display_shift.rs
