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lib.rs
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lib.rs
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#![no_std]
// associated re-typing not supported in rust yet
#![allow(clippy::type_complexity)]
//! This crate provides a generic ddisplay driver to connect to TFT displays
//! that implement the [MIPI DSI](https://www.mipi.org/specifications/dsi).
//! Currently only supports SPI with DC pin setups via the [display_interface]
//!
//! An optional batching of draws is supported via the `batch` feature (default on)
//!
//! ## Example
//! ```rust
//! // create a DisplayInterface from SPI and DC pin, with no manual CS control
//! let di = SPIInterfaceNoCS::new(spi, dc);
//! // create the ILI9486 display driver from the display interface and RST pin
//! let mut display = Display::ili9486(di, rst);
//! // clear the display to black
//! display.clear(Rgb666::BLACK)?;
pub mod instruction;
use crate::instruction::Instruction;
use display_interface::DataFormat;
use display_interface::DisplayError;
use display_interface::WriteOnlyDataCommand;
use embedded_hal::blocking::delay::DelayUs;
use embedded_hal::digital::v2::OutputPin;
pub mod models;
use models::Model;
mod graphics;
mod no_pin;
pub use no_pin::*;
#[cfg(feature = "batch")]
mod batch;
///
/// Display driver to connect to TFT displays.
///
pub struct Display<DI, RST, MODEL>
where
DI: WriteOnlyDataCommand,
RST: OutputPin,
MODEL: Model,
{
// Display interface
di: DI,
// Reset pin.
rst: Option<RST>,
// Model
model: MODEL,
// Current orientation
orientation: Orientation,
}
///
/// Display orientation.
///
#[repr(u8)]
#[derive(Copy, Clone)]
pub enum Orientation {
Portrait = 0b0000_0000, // no inverting
Landscape = 0b0110_0000, // invert column and page/column order
PortraitSwapped = 0b1100_0000, // invert page and column order
LandscapeSwapped = 0b1010_0000, // invert page and page/column order
}
impl Default for Orientation {
fn default() -> Self {
Self::Portrait
}
}
///
/// Tearing effect output setting.
///
#[derive(Copy, Clone)]
pub enum TearingEffect {
/// Disable output.
Off,
/// Output vertical blanking information.
Vertical,
/// Output horizontal and vertical blanking information.
HorizontalAndVertical,
}
///
/// An error holding its source (pins or SPI)
///
#[derive(Debug)]
pub enum Error<PE> {
DisplayError,
Pin(PE),
}
impl<PE> From<DisplayError> for Error<PE> {
fn from(_: DisplayError) -> Self {
Error::DisplayError
}
}
impl<DI, RST, M> Display<DI, RST, M>
where
DI: WriteOnlyDataCommand,
RST: OutputPin,
M: Model,
{
///
/// Creates a new [Display] driver instance with given [Model]
///
/// # Arguments
///
/// * `di` - a [DisplayInterface](WriteOnlyDataCommand) for talking with the display
/// * `rst` - display hard reset [OutputPin]
/// * `model` - the display [Model]
///
pub fn with_model(di: DI, rst: Option<RST>, model: M) -> Self {
Self {
di,
rst,
model,
orientation: Orientation::default(),
}
}
///
/// Runs commands to initialize the display
///
/// # Arguments
///
/// * `delay_source` - mutable reference to a [DelayUs] provider
///
pub fn init(&mut self, delay_source: &mut impl DelayUs<u32>) -> Result<(), Error<RST::Error>> {
self.model.init(&mut self.di, &mut self.rst, delay_source)
}
///
/// Returns currently set [Orientation]
///
pub fn orientation(&self) -> Orientation {
self.orientation
}
///
/// Sets display [Orientation]
///
pub fn set_orientation(&mut self, orientation: Orientation) -> Result<(), Error<RST::Error>> {
self.write_command(Instruction::MADCTL)?;
self.write_data(&[orientation as u8])?;
self.orientation = orientation;
Ok(())
}
///
/// Sets a pixel color at the given coords.
///
/// # Arguments
///
/// * `x` - x coordinate
/// * `y` - y coordinate
/// * `color` - the color value in pixel format of the display [Model]
///
pub fn set_pixel(
&mut self,
x: u16,
y: u16,
color: M::ColorFormat,
) -> Result<(), Error<RST::Error>> {
self.set_address_window(x, y, x, y)?;
self.model
.write_pixels(&mut self.di, core::iter::once(color))?;
Ok(())
}
///
/// Sets pixel colors in given rectangle bounds.
///
/// # Arguments
///
/// * `sx` - x coordinate start
/// * `sy` - y coordinate start
/// * `ex` - x coordinate end
/// * `ey` - y coordinate end
/// * `colors` - anything that can provide `IntoIterator<Item = u16>` to iterate over pixel data
///
pub fn set_pixels<T>(
&mut self,
sx: u16,
sy: u16,
ex: u16,
ey: u16,
colors: T,
) -> Result<(), Error<RST::Error>>
where
T: IntoIterator<Item = M::ColorFormat>,
{
self.set_address_window(sx, sy, ex, ey)?;
self.model.write_pixels(&mut self.di, colors)?;
Ok(())
}
///
/// Sets scroll offset "shifting" the displayed picture
/// # Arguments
///
/// * `offset` - scroll offset in pixels
///
pub fn set_scroll_offset(&mut self, offset: u16) -> Result<(), Error<RST::Error>> {
self.write_command(Instruction::VSCAD)?;
self.write_data(&offset.to_be_bytes())
}
///
/// Release resources allocated to this driver back.
/// This returns the display interface and the RST pin deconstructing the driver.
///
pub fn release(self) -> (DI, Option<RST>, M) {
(self.di, self.rst, self.model)
}
fn write_command(&mut self, command: Instruction) -> Result<(), Error<RST::Error>> {
self.di
.send_commands(DataFormat::U8(&[command as u8]))
.map_err(|_| Error::DisplayError)?;
Ok(())
}
fn write_data(&mut self, data: &[u8]) -> Result<(), Error<RST::Error>> {
self.di
.send_data(DataFormat::U8(data))
.map_err(|_| Error::DisplayError)
}
// Sets the address window for the display.
fn set_address_window(
&mut self,
sx: u16,
sy: u16,
ex: u16,
ey: u16,
) -> Result<(), Error<RST::Error>> {
self.write_command(Instruction::CASET)?;
self.write_data(&sx.to_be_bytes())?;
self.write_data(&ex.to_be_bytes())?;
self.write_command(Instruction::RASET)?;
self.write_data(&sy.to_be_bytes())?;
self.write_data(&ey.to_be_bytes())
}
///
/// Configures the tearing effect output.
///
pub fn set_tearing_effect(
&mut self,
tearing_effect: TearingEffect,
) -> Result<(), Error<RST::Error>> {
match tearing_effect {
TearingEffect::Off => self.write_command(Instruction::TEOFF),
TearingEffect::Vertical => {
self.write_command(Instruction::TEON)?;
self.write_data(&[0])
}
TearingEffect::HorizontalAndVertical => {
self.write_command(Instruction::TEON)?;
self.write_data(&[1])
}
}
}
}