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epd-waveshare
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epd-waveshare/src/epd4in2/mod.rs

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//! A simple Driver for the Waveshare 4.2" E-Ink Display via SPI
//!
//! The other Waveshare E-Ink Displays should be added later on
//!
//! Build with the help of documentation/code from [Waveshare](https://www.waveshare.com/wiki/4.2inch_e-Paper_Module),
//! [Ben Krasnows partial Refresh tips](https://benkrasnow.blogspot.de/2017/10/fast-partial-refresh-on-42-e-paper.html) and
//! the driver documents in the `pdfs`-folder as orientation.
//!
//! This driver was built using [`embedded-hal`] traits.
//!
//! [`embedded-hal`]: https://docs.rs/embedded-hal/~0.1
//!
//! # Requirements
//!
//! ### SPI
//!
//! - MISO is not connected/available
//! - SPI_MODE_0 is used (CPHL = 0, CPOL = 0)
//! - 8 bits per word, MSB first
//! - Max. Speed tested was 8Mhz but more should be possible
//!
//! ### Other....
//!
//! - Buffersize: Wherever a buffer is used it always needs to be of the size: `width / 8 * length`,
//! where width and length being either the full e-ink size or the partial update window size
//!
//! # Examples
//!
//! ```ignore
//! let mut epd4in2 = EPD4in2::new(spi, cs, busy, dc, rst, delay).unwrap();
//!
//! let mut buffer = [0u8, epd4in2.get_width() / 8 * epd4in2.get_height()];
//!
//! // draw something into the buffer
//!
//! epd4in2.display_and_transfer_buffer(buffer, None);
//!
//! // wait and look at the image
//!
//! epd4in2.clear_frame(None);
//!
//! epd4in2.sleep();
//! ```
//!
//!
//!
//! BE CAREFUL! The screen can get ghosting/burn-ins through the Partial Fast Update Drawing.
use hal::{
blocking::{delay::*, spi::Write},
digital::*,
spi::{Mode, Phase, Polarity},
};
use interface::{connection_interface::ConnectionInterface, WaveshareInterface};
//The Lookup Tables for the Display
mod constants;
use self::constants::*;
use drawing::color::Color;
pub mod command;
pub use self::command::Command;
//TODO: test spi mode
/// SPI mode -
/// For more infos see [Requirements: SPI](index.html#spi)
pub const SPI_MODE: Mode = Mode {
phase: Phase::CaptureOnFirstTransition,
polarity: Polarity::IdleLow,
};
/// EPD4in2 driver
///
pub struct EPD4in2<SPI, CS, BUSY, DC, RST, D>
{
/// Connection Interface
interface: ConnectionInterface<SPI, CS, BUSY, DC, RST, D>,
/// Width
width: u16,
/// Height
height: u16,
/// Background Color
color: Color,
}
impl<SPI, CS, BUSY, DataCommand, RST, Delay, Error> WaveshareInterface<SPI, CS, BUSY, DataCommand, RST, Delay, Error>
for EPD4in2<SPI, CS, BUSY, DataCommand, RST, Delay>
where
SPI: Write<u8>,
CS: OutputPin,
BUSY: InputPin,
DataCommand: OutputPin,
RST: OutputPin,
Delay: DelayUs<u16> + DelayMs<u16>,
{
fn get_width(&self) -> u16 {
self.width
}
fn get_height(&self) -> u16 {
self.height
}
/// Creates a new driver from a SPI peripheral, CS Pin, Busy InputPin, DC
///
/// This already initialises the device. That means [init()](init()) isn't needed directly afterwards
///
/// # Example
///
/// ```ignore
/// //buffer = some image data;
///
/// let mut epd4in2 = EPD4in2::new(spi, cs, busy, dc, rst, delay);
///
/// epd4in2.display_and_transfer_frame(buffer, None);
///
/// epd4in2.sleep();
/// ```
fn new(interface: ConnectionInterface<SPI, CS, BUSY, DataCommand, RST, Delay>) -> Result<Self, Error> {
let width = WIDTH as u16;
let height = HEIGHT as u16;
let color = Color::White;
let mut epd = EPD4in2 {
interface,
width,
height,
color,
};
epd.init()?;
Ok(epd)
}
fn init(&mut self) -> Result<(), Error> {
// reset the device
self.reset();
// set the power settings
self.send_command(Command::POWER_SETTING)?;
self.send_data(0x03)?; //VDS_EN, VDG_EN
self.send_data(0x00)?; //VCOM_HV, VGHL_LV[1], VGHL_LV[0]
self.send_data(0x2b)?; //VDH
self.send_data(0x2b)?; //VDL
self.send_data(0xff)?; //VDHR
// start the booster
self.send_command(Command::BOOSTER_SOFT_START)?;
for _ in 0..3 {
self.send_data(0x17)?; //07 0f 17 1f 27 2F 37 2f
}
// power on
self.send_command(Command::POWER_ON)?;
self.wait_until_idle();
// set the panel settings
self.send_command(Command::PANEL_SETTING)?;
// 0x0F Red Mode, LUT from OTP
// 0x1F B/W Mode, LUT from OTP
// 0x2F Red Mode, LUT set by registers
// 0x3F B/W Mode, LUT set by registers
self.send_data(0x3F)?;
// the values used by waveshare before for the panel settings
// instead of our one liner:
// SendData(0xbf); // KW-BF KWR-AF BWROTP 0f
// SendData(0x0b);
// Set Frequency, 200 Hz didn't work on my board
// 150Hz and 171Hz wasn't tested yet
// TODO: Test these other frequencies
// 3A 100HZ 29 150Hz 39 200HZ 31 171HZ DEFAULT: 3c 50Hz
self.send_command(Command::PLL_CONTROL)?;
self.send_data(0x3A)?;
self.set_lut()?;
Ok(())
}
fn sleep(&mut self) -> Result<(), E> {
self.send_command(Command::VCOM_AND_DATA_INTERVAL_SETTING)?;
self.send_data(0x17)?; //border floating
self.send_command(Command::VCM_DC_SETTING)?; // VCOM to 0V
self.send_command(Command::PANEL_SETTING)?;
self.delay_ms(100);
self.send_command(Command::POWER_SETTING)?; //VG&VS to 0V fast
for _ in 0..4 {
self.send_data(0x00)?;
}
self.delay_ms(100);
self.send_command(Command::POWER_OFF)?;
self.wait_until_idle();
self.send_command(Command::DEEP_SLEEP)?;
self.send_data(0xA5)?;
Ok(())
}
fn reset(&mut self) {
self.interface.reset()
}
fn delay_ms(&mut self, delay: u16) {
self.interface.delay_ms(delay)
}
fn update_frame(&mut self, buffer: &[u8]) -> Result<(), E> {
let color_value = self.color.get_byte_value();
self.send_resolution()?;
self.send_command(Command::VCM_DC_SETTING)?;
self.send_data(0x12)?;
self.send_command(Command::VCOM_AND_DATA_INTERVAL_SETTING)?;
//TODO: this was a send_command instead of a send_data. check if it's alright and doing what it should do (setting the default values)
//self.send_command_u8(0x97)?; //VBDF 17|D7 VBDW 97 VBDB 57 VBDF F7 VBDW 77 VBDB 37 VBDR B7
self.send_data(0x97)?;
self.send_command(Command::DATA_START_TRANSMISSION_1)?;
for _ in 0..(buffer.len()) {
self.send_data(color_value)?;
}
self.delay_ms(2);
self.send_command(Command::DATA_START_TRANSMISSION_2)?;
//self.send_multiple_data(buffer)?;
for &elem in buffer.iter() {
self.send_data(elem)?;
}
Ok(())
}
fn update_partial_frame(
&mut self,
buffer: &[u8],
x: u16,
y: u16,
width: u16,
height: u16,
) -> Result<(), E> {
if buffer.len() as u16 != width / 8 * height {
//TODO: panic!! or sth like that
//return Err("Wrong buffersize");
}
self.send_command(Command::PARTIAL_IN)?;
self.send_command(Command::PARTIAL_WINDOW)?;
self.send_data((x >> 8) as u8)?;
let tmp = x & 0xf8;
self.send_data(tmp as u8)?; // x should be the multiple of 8, the last 3 bit will always be ignored
let tmp = tmp + width - 1;
self.send_data((tmp >> 8) as u8)?;
self.send_data((tmp | 0x07) as u8)?;
self.send_data((y >> 8) as u8)?;
self.send_data(y as u8)?;
self.send_data(((y + height - 1) >> 8) as u8)?;
self.send_data((y + height - 1) as u8)?;
self.send_data(0x01)?; // Gates scan both inside and outside of the partial window. (default)
//TODO: handle dtm somehow
let is_dtm1 = false;
if is_dtm1 {
self.send_command(Command::DATA_START_TRANSMISSION_1)?
} else {
self.send_command(Command::DATA_START_TRANSMISSION_2)?
}
self.send_multiple_data(buffer)?;
self.send_command(Command::PARTIAL_OUT)
}
fn update_and_display_frame(&mut self, buffer: &[u8]) -> Result<(), E>{
self.update_frame(buffer)?;
self.display_frame()
}
fn display_frame(&mut self) -> Result<(), E> {
self.send_command(Command::DISPLAY_REFRESH)?;
self.wait_until_idle();
Ok(())
}
// TODO: add this abstraction function
// fn update_and_display_frame(&mut self, buffer: &[u8]) -> Result<(), E>;
fn clear_frame(&mut self) -> Result<(), E> {
self.send_resolution()?;
let size = self.width / 8 * self.height;
let color_value = self.color.get_byte_value();
self.send_command(Command::DATA_START_TRANSMISSION_1)?;
self.delay_ms(2);
for _ in 0..size {
self.send_data(color_value)?;
}
self.delay_ms(2);
self.send_command(Command::DATA_START_TRANSMISSION_2)?;
self.delay_ms(2);
for _ in 0..size {
self.send_data(color_value)?;
}
Ok(())
}
/// Sets the backgroundcolor for various commands like [WaveshareInterface::clear_frame()](clear_frame())
fn set_background_color(&mut self, color: Color) {
self.color = color;
}
}
impl<SPI, CS, BUSY, DC, RST, D, E> EPD4in2<SPI, CS, BUSY, DC, RST, D>
where
SPI: Write<u8, Error = E>,
CS: OutputPin,
BUSY: InputPin,
DC: OutputPin,
RST: OutputPin,
D: DelayUs<u16> + DelayMs<u16>,
{
fn send_command(&mut self, command: Command) -> Result<(), E> {
self.interface.send_command(command)
}
fn send_data(&mut self, val: u8) -> Result<(), E> {
self.interface.send_data(val)
}
fn send_multiple_data(&mut self, data: &[u8]) -> Result<(), E> {
self.interface.send_multiple_data(data)
}
fn wait_until_idle(&mut self) {
self.interface.wait_until_idle(true)
}
fn send_resolution(&mut self) -> Result<(), E> {
let w = self.get_width();
let h = self.get_height();
self.send_command(Command::RESOLUTION_SETTING)?;
self.send_data((w >> 8) as u8)?;
self.send_data(w as u8)?;
self.send_data((h >> 8) as u8)?;
self.send_data(h as u8)
}
/// Fill the look-up table for the EPD
//TODO: make public?
fn set_lut(&mut self) -> Result<(), E> {
self.set_lut_helper(&LUT_VCOM0, &LUT_WW, &LUT_BW, &LUT_WB, &LUT_BB)
}
/// Fill the look-up table for a quick display (partial refresh)
///
/// Is automatically done by [EPD4in2::display_frame_quick()](EPD4in2::display_frame_quick())
/// //TODO: make public?
#[cfg(feature = "epd4in2_fast_update")]
fn set_lut_quick(&mut self) -> Result<(), E> {
self.set_lut_helper(
&LUT_VCOM0_QUICK,
&LUT_WW_QUICK,
&LUT_BW_QUICK,
&LUT_WB_QUICK,
&LUT_BB_QUICK,
)
}
fn set_lut_helper(
&mut self,
lut_vcom: &[u8],
lut_ww: &[u8],
lut_bw: &[u8],
lut_wb: &[u8],
lut_bb: &[u8],
) -> Result<(), E> {
// LUT VCOM
self.send_command(Command::LUT_FOR_VCOM)?;
self.send_multiple_data(lut_vcom)?;
// LUT WHITE to WHITE
self.send_command(Command::LUT_WHITE_TO_WHITE)?;
self.send_multiple_data(lut_ww)?;
// LUT BLACK to WHITE
self.send_command(Command::LUT_BLACK_TO_WHITE)?;
self.send_multiple_data(lut_bw)?;
// LUT WHITE to BLACK
self.send_command(Command::LUT_WHITE_TO_BLACK)?;
self.send_multiple_data(lut_wb)?;
// LUT BLACK to BLACK
self.send_command(Command::LUT_BLACK_TO_BLACK)?;
self.send_multiple_data(lut_bb)?;
Ok(())
}
}