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mod.rs
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mod.rs
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//! A simple Driver for the Waveshare 1.54" E-Ink Display via SPI
//!
//! # Example for the 1.54 in E-Ink Display
//!
//!```rust, no_run
//!# use embedded_hal_mock::eh1::*;
//!# fn main() -> Result<(), embedded_hal::spi::ErrorKind> {
//!use embedded_graphics::{
//! pixelcolor::BinaryColor::On as Black, prelude::*, primitives::{Line, PrimitiveStyleBuilder},
//!};
//!use epd_waveshare::{epd1in54::*, prelude::*};
//!#
//!# let expectations = [];
//!# let mut spi = spi::Mock::new(&expectations);
//!# let expectations = [];
//!# let cs_pin = pin::Mock::new(&expectations);
//!# let busy_in = pin::Mock::new(&expectations);
//!# let dc = pin::Mock::new(&expectations);
//!# let rst = pin::Mock::new(&expectations);
//!# let mut delay = delay::NoopDelay::new();
//!
//!// Setup EPD
//!let mut epd = Epd1in54::new(&mut spi, busy_in, dc, rst, &mut delay, None)?;
//!
//!// Use display graphics from embedded-graphics
//!let mut display = Display1in54::default();
//!
//!// Use embedded graphics for drawing a line
//!let style = PrimitiveStyleBuilder::new()
//! .stroke_color(Color::Black)
//! .stroke_width(1)
//! .build();
//!let _ = Line::new(Point::new(0, 120), Point::new(0, 295))
//! .into_styled(style)
//! .draw(&mut display);
//!
//!// Display updated frame
//!epd.update_frame(&mut spi, &display.buffer(), &mut delay)?;
//!epd.display_frame(&mut spi, &mut delay)?;
//!
//!// Set the EPD to sleep
//!epd.sleep(&mut spi, &mut delay)?;
//!# Ok(())
//!# }
//!```
/// Width of the display
pub const WIDTH: u32 = 200;
/// Height of the display
pub const HEIGHT: u32 = 200;
/// Default Background Color
pub const DEFAULT_BACKGROUND_COLOR: Color = Color::White;
//const DPI: u16 = 184;
const IS_BUSY_LOW: bool = false;
const SINGLE_BYTE_WRITE: bool = true;
use embedded_hal::{delay::*, digital::*, spi::SpiDevice};
use crate::type_a::{
command::Command,
constants::{LUT_FULL_UPDATE, LUT_PARTIAL_UPDATE},
};
use crate::color::Color;
use crate::traits::{RefreshLut, WaveshareDisplay};
use crate::buffer_len;
use crate::interface::DisplayInterface;
/// Full size buffer for use with the 1in54b EPD
#[cfg(feature = "graphics")]
pub type Display1in54 = crate::graphics::Display<
WIDTH,
HEIGHT,
false,
{ buffer_len(WIDTH as usize, HEIGHT as usize) },
Color,
>;
/// Epd1in54 driver
pub struct Epd1in54<SPI, BUSY, DC, RST, DELAY> {
/// SPI
interface: DisplayInterface<SPI, BUSY, DC, RST, DELAY, SINGLE_BYTE_WRITE>,
/// Color
background_color: Color,
/// Refresh LUT
refresh: RefreshLut,
}
impl<SPI, BUSY, DC, RST, DELAY> Epd1in54<SPI, BUSY, DC, RST, DELAY>
where
SPI: SpiDevice,
BUSY: InputPin,
DC: OutputPin,
RST: OutputPin,
DELAY: DelayNs,
{
fn init(&mut self, spi: &mut SPI, delay: &mut DELAY) -> Result<(), SPI::Error> {
self.interface.reset(delay, 10_000, 10_000);
// 3 Databytes:
// A[7:0]
// 0.. A[8]
// 0.. B[2:0]
// Default Values: A = Height of Screen (0x127), B = 0x00 (GD, SM and TB=0?)
self.interface.cmd_with_data(
spi,
Command::DriverOutputControl,
&[HEIGHT as u8, (HEIGHT >> 8) as u8, 0x00],
)?;
// 3 Databytes: (and default values from datasheet and arduino)
// 1 .. A[6:0] = 0xCF | 0xD7
// 1 .. B[6:0] = 0xCE | 0xD6
// 1 .. C[6:0] = 0x8D | 0x9D
//TODO: test
self.interface
.cmd_with_data(spi, Command::BoosterSoftStartControl, &[0xD7, 0xD6, 0x9D])?;
// One Databyte with value 0xA8 for 7V VCOM
self.interface
.cmd_with_data(spi, Command::WriteVcomRegister, &[0xA8])?;
// One Databyte with default value 0x1A for 4 dummy lines per gate
self.interface
.cmd_with_data(spi, Command::SetDummyLinePeriod, &[0x1A])?;
// One Databyte with default value 0x08 for 2us per line
self.interface
.cmd_with_data(spi, Command::SetGateLineWidth, &[0x08])?;
// One Databyte with default value 0x03
// -> address: x increment, y increment, address counter is updated in x direction
self.interface
.cmd_with_data(spi, Command::DataEntryModeSetting, &[0x03])?;
self.set_lut(spi, delay, None)?;
self.wait_until_idle(spi, delay)?;
Ok(())
}
}
impl<SPI, BUSY, DC, RST, DELAY> WaveshareDisplay<SPI, BUSY, DC, RST, DELAY>
for Epd1in54<SPI, BUSY, DC, RST, DELAY>
where
SPI: SpiDevice,
BUSY: InputPin,
DC: OutputPin,
RST: OutputPin,
DELAY: DelayNs,
{
type DisplayColor = Color;
fn width(&self) -> u32 {
WIDTH
}
fn height(&self) -> u32 {
HEIGHT
}
fn new(
spi: &mut SPI,
busy: BUSY,
dc: DC,
rst: RST,
delay: &mut DELAY,
delay_us: Option<u32>,
) -> Result<Self, SPI::Error> {
let interface = DisplayInterface::new(busy, dc, rst, delay_us);
let mut epd = Epd1in54 {
interface,
background_color: DEFAULT_BACKGROUND_COLOR,
refresh: RefreshLut::Full,
};
epd.init(spi, delay)?;
Ok(epd)
}
fn wake_up(&mut self, spi: &mut SPI, delay: &mut DELAY) -> Result<(), SPI::Error> {
self.init(spi, delay)
}
fn sleep(&mut self, spi: &mut SPI, delay: &mut DELAY) -> Result<(), SPI::Error> {
self.wait_until_idle(spi, delay)?;
// 0x00 for Normal mode (Power on Reset), 0x01 for Deep Sleep Mode
//TODO: is 0x00 needed here or would 0x01 be even more efficient?
self.interface
.cmd_with_data(spi, Command::DeepSleepMode, &[0x00])?;
Ok(())
}
fn update_frame(
&mut self,
spi: &mut SPI,
buffer: &[u8],
delay: &mut DELAY,
) -> Result<(), SPI::Error> {
self.wait_until_idle(spi, delay)?;
self.use_full_frame(spi, delay)?;
self.interface
.cmd_with_data(spi, Command::WriteRam, buffer)?;
Ok(())
}
//TODO: update description: last 3 bits will be ignored for width and x_pos
fn update_partial_frame(
&mut self,
spi: &mut SPI,
delay: &mut DELAY,
buffer: &[u8],
x: u32,
y: u32,
width: u32,
height: u32,
) -> Result<(), SPI::Error> {
self.wait_until_idle(spi, delay)?;
self.set_ram_area(spi, delay, x, y, x + width, y + height)?;
self.set_ram_counter(spi, delay, x, y)?;
self.interface
.cmd_with_data(spi, Command::WriteRam, buffer)?;
Ok(())
}
fn display_frame(&mut self, spi: &mut SPI, delay: &mut DELAY) -> Result<(), SPI::Error> {
self.wait_until_idle(spi, delay)?;
// enable clock signal, enable cp, display pattern -> 0xC4 (tested with the arduino version)
//TODO: test control_1 or control_2 with default value 0xFF (from the datasheet)
self.interface
.cmd_with_data(spi, Command::DisplayUpdateControl2, &[0xC4])?;
self.interface.cmd(spi, Command::MasterActivation)?;
// MASTER Activation should not be interupted to avoid currption of panel images
// therefore a terminate command is send
self.interface.cmd(spi, Command::Nop)?;
Ok(())
}
fn update_and_display_frame(
&mut self,
spi: &mut SPI,
buffer: &[u8],
delay: &mut DELAY,
) -> Result<(), SPI::Error> {
self.update_frame(spi, buffer, delay)?;
self.display_frame(spi, delay)?;
Ok(())
}
fn clear_frame(&mut self, spi: &mut SPI, delay: &mut DELAY) -> Result<(), SPI::Error> {
self.wait_until_idle(spi, delay)?;
self.use_full_frame(spi, delay)?;
// clear the ram with the background color
let color = self.background_color.get_byte_value();
self.interface.cmd(spi, Command::WriteRam)?;
self.interface
.data_x_times(spi, color, WIDTH / 8 * HEIGHT)?;
Ok(())
}
fn set_background_color(&mut self, background_color: Color) {
self.background_color = background_color;
}
fn background_color(&self) -> &Color {
&self.background_color
}
fn set_lut(
&mut self,
spi: &mut SPI,
delay: &mut DELAY,
refresh_rate: Option<RefreshLut>,
) -> Result<(), SPI::Error> {
if let Some(refresh_lut) = refresh_rate {
self.refresh = refresh_lut;
}
match self.refresh {
RefreshLut::Full => self.set_lut_helper(spi, delay, &LUT_FULL_UPDATE),
RefreshLut::Quick => self.set_lut_helper(spi, delay, &LUT_PARTIAL_UPDATE),
}
}
fn wait_until_idle(&mut self, _spi: &mut SPI, delay: &mut DELAY) -> Result<(), SPI::Error> {
self.interface.wait_until_idle(delay, IS_BUSY_LOW);
Ok(())
}
}
impl<SPI, BUSY, DC, RST, DELAY> Epd1in54<SPI, BUSY, DC, RST, DELAY>
where
SPI: SpiDevice,
BUSY: InputPin,
DC: OutputPin,
RST: OutputPin,
DELAY: DelayNs,
{
pub(crate) fn use_full_frame(
&mut self,
spi: &mut SPI,
delay: &mut DELAY,
) -> Result<(), SPI::Error> {
// choose full frame/ram
self.set_ram_area(spi, delay, 0, 0, WIDTH - 1, HEIGHT - 1)?;
// start from the beginning
self.set_ram_counter(spi, delay, 0, 0)
}
pub(crate) fn set_ram_area(
&mut self,
spi: &mut SPI,
delay: &mut DELAY,
start_x: u32,
start_y: u32,
end_x: u32,
end_y: u32,
) -> Result<(), SPI::Error> {
self.wait_until_idle(spi, delay)?;
assert!(start_x < end_x);
assert!(start_y < end_y);
// x is positioned in bytes, so the last 3 bits which show the position inside a byte in the ram
// aren't relevant
self.interface.cmd_with_data(
spi,
Command::SetRamXAddressStartEndPosition,
&[(start_x >> 3) as u8, (end_x >> 3) as u8],
)?;
// 2 Databytes: A[7:0] & 0..A[8] for each - start and end
self.interface.cmd_with_data(
spi,
Command::SetRamYAddressStartEndPosition,
&[
start_y as u8,
(start_y >> 8) as u8,
end_y as u8,
(end_y >> 8) as u8,
],
)?;
Ok(())
}
pub(crate) fn set_ram_counter(
&mut self,
spi: &mut SPI,
delay: &mut DELAY,
x: u32,
y: u32,
) -> Result<(), SPI::Error> {
self.wait_until_idle(spi, delay)?;
// x is positioned in bytes, so the last 3 bits which show the position inside a byte in the ram
// aren't relevant
self.interface
.cmd_with_data(spi, Command::SetRamXAddressCounter, &[(x >> 3) as u8])?;
// 2 Databytes: A[7:0] & 0..A[8]
self.interface.cmd_with_data(
spi,
Command::SetRamYAddressCounter,
&[y as u8, (y >> 8) as u8],
)?;
Ok(())
}
fn set_lut_helper(
&mut self,
spi: &mut SPI,
delay: &mut DELAY,
buffer: &[u8],
) -> Result<(), SPI::Error> {
self.wait_until_idle(spi, delay)?;
assert!(buffer.len() == 30);
self.interface
.cmd_with_data(spi, Command::WriteLutRegister, buffer)?;
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn epd_size() {
assert_eq!(WIDTH, 200);
assert_eq!(HEIGHT, 200);
assert_eq!(DEFAULT_BACKGROUND_COLOR, Color::White);
}
}