lcd_async/dcs/
set_scroll_start.rs

1//! Module for the VSCAD visual scroll offset instruction constructors
2
3use super::DcsCommand;
4
5/// Set Scroll Start
6#[derive(Debug, Clone, PartialEq, Eq)]
7#[cfg_attr(feature = "defmt", derive(defmt::Format))]
8pub struct SetScrollStart(u16);
9
10impl SetScrollStart {
11    /// Creates a new Set Scroll Start command.
12    pub const fn new(offset: u16) -> Self {
13        Self(offset)
14    }
15}
16
17impl DcsCommand for SetScrollStart {
18    fn instruction(&self) -> u8 {
19        0x37
20    }
21
22    fn fill_params_buf(&self, buffer: &mut [u8]) -> usize {
23        let bytes = self.0.to_be_bytes();
24        buffer[0] = bytes[0];
25        buffer[1] = bytes[1];
26
27        2
28    }
29}
30
31#[cfg(test)]
32mod tests {
33    use super::*;
34
35    #[test]
36    fn vscad_fills_offset_properly() {
37        let vscad = SetScrollStart::new(320);
38
39        let mut buffer = [0u8; 2];
40        assert_eq!(vscad.fill_params_buf(&mut buffer), 2);
41        assert_eq!(buffer, [0x1, 0x40]);
42    }
43}
lcd_async/dcs/set_scroll_start.rs

lcd_async/dcs/
set_scroll_start.rs
