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This commit is contained in:
Christoph Groß
2018-07-23 14:44:28 +02:00
parent 92c399707c 0a18416da7
commit 51ef655819
10 changed files with 1050 additions and 394 deletions
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src/epd4in2/command.rs
+8 -7
View File
@@ -1,5 +1,5 @@
//! SPI Commands for the Waveshare 4.2" E-Ink Display
use interface;
/// EPD4IN2 commands
///
/// Should rarely (never?) be needed directly.
@@ -97,7 +97,7 @@ pub enum Command {
LOW_POWER_DETECTION = 0x51,
/// This command defines non-overlap period of Gate and Source.
TCON_SETTING = 0x60,
/// This command defines alternative resolution and this setting is of higher priority than the RES[1:0] in R00H (PSR).
/// This command defines alternative resolution and this setting is of higher priority than the RES\[1:0\] in R00H (PSR).
RESOLUTION_SETTING = 0x61,
/// This command defines the Fist Active Gate and First Active Source of active channels.
GSST_SETTING = 0x65,
@@ -146,9 +146,9 @@ pub enum Command {
impl Command {
impl interface::Command for Command {
/// Returns the address of the command
pub fn addr(self) -> u8 {
fn address(self) -> u8 {
self as u8
}
}
@@ -157,13 +157,14 @@ impl Command {
#[cfg(test)]
mod tests {
use super::*;
use interface::Command as CommandTrait;
#[test]
fn command_addr() {
assert_eq!(Command::POWER_SAVING.addr(), 0xE3);
assert_eq!(Command::POWER_SAVING.address(), 0xE3);
assert_eq!(Command::PANEL_SETTING.addr(), 0x00);
assert_eq!(Command::PANEL_SETTING.address(), 0x00);
assert_eq!(Command::DISPLAY_REFRESH.addr(), 0x12);
assert_eq!(Command::DISPLAY_REFRESH.address(), 0x12);
}
}
src/epd4in2/lut.rs → src/epd4in2/constants.rs
+9 -5
View File
@@ -1,3 +1,6 @@
pub(crate) const WIDTH: usize = 400;
pub(crate) const HEIGHT: usize = 300;
pub(crate) const LUT_VCOM0: [u8; 44] = [
0x00, 0x17, 0x00, 0x00, 0x00, 0x02,
0x00, 0x17, 0x17, 0x00, 0x00, 0x02,
@@ -8,7 +11,7 @@ pub(crate) const LUT_VCOM0: [u8; 44] = [
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];
#[cfg(feature = "epd4in2_fast_update")]
#[cfg(feature = "epd4in2_fast_update")]
pub(crate) const LUT_VCOM0_QUICK: [u8; 44] = [
0x00, 0x0E, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -19,6 +22,7 @@ pub(crate) const LUT_VCOM0_QUICK: [u8; 44] = [
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];
pub(crate) const LUT_WW: [u8; 42] =[
0x40, 0x17, 0x00, 0x00, 0x00, 0x02,
0x90, 0x17, 0x17, 0x00, 0x00, 0x02,
@@ -29,7 +33,7 @@ pub(crate) const LUT_WW: [u8; 42] =[
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];
#[cfg(feature = "epd4in2_fast_update")]
#[cfg(feature = "epd4in2_fast_update")]
pub(crate) const LUT_WW_QUICK: [u8; 42] =[
0xA0, 0x0E, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -51,7 +55,7 @@ pub(crate) const LUT_BW: [u8; 42] =[
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];
#[cfg(feature = "epd4in2_fast_update")]
#[cfg(feature = "epd4in2_fast_update")]
pub(crate) const LUT_BW_QUICK: [u8; 42] =[
0xA0, 0x0E, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -73,7 +77,7 @@ pub(crate) const LUT_BB: [u8; 42] =[
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];
#[cfg(feature = "epd4in2_fast_update")]
#[cfg(feature = "epd4in2_fast_update")]
pub(crate) const LUT_BB_QUICK: [u8; 42] =[
0x50, 0x0E, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -95,7 +99,7 @@ pub(crate) const LUT_WB: [u8; 42] =[
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];
#[cfg(feature = "epd4in2_fast_update")]
#[cfg(feature = "epd4in2_fast_update")]
pub(crate) const LUT_WB_QUICK: [u8; 42] =[
0x50, 0x0E, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
src/epd4in2/mod.rs
+230 -373
View File
@@ -1,27 +1,27 @@
//! 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),
//!
//! 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`,
//!
//! - 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
@@ -30,81 +30,63 @@
//! 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::{
spi::Write,
delay::*
},
blocking::{delay::*, spi::Write},
digital::*,
spi::{Mode, Phase, Polarity},
digital::*
};
use interface::{connection_interface::ConnectionInterface, WaveshareInterface};
//The Lookup Tables for the Display
mod lut;
use self::lut::*;
mod constants;
use self::constants::*;
use drawing::color::Color;
pub mod command;
pub use command::Command as Command;
pub use self::command::Command;
//TODO: test spi mode
/// 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> {
/// SPI
spi: SPI,
/// CS for SPI
cs: CS,
/// Low for busy, Wait until display is ready!
busy: BUSY,
/// Data/Command Control Pin (High for data, Low for command)
dc: DC,
/// Pin for Reseting
rst: RST,
/// The concrete Delay implementation
delay: D,
/// Connection Interface
interface: ConnectionInterface<SPI, CS, BUSY, DC, RST, D>,
/// Width
width: u16,
/// Height
height: u16,
height: u16,
/// Background Color
color: Color,
}
impl<SPI, CS, BUSY, DC, RST, D, E> EPD4in2<SPI, CS, BUSY, DC, RST, D>
where
impl<SPI, CS, BUSY, DC, RST, D, E> WaveshareInterface<SPI, CS, BUSY, DC, RST, D, E>
for EPD4in2<SPI, CS, BUSY, DC, RST, D>
where
SPI: Write<u8, Error = E>,
CS: OutputPin,
BUSY: InputPin,
@@ -112,54 +94,48 @@ where
RST: OutputPin,
D: DelayUs<u16> + DelayMs<u16>,
{
/// Get the width of the display
pub fn get_width(&self) -> u16 {
fn get_width(&self) -> u16 {
self.width
}
/// Get the height of the display
pub fn get_height(&self) -> u16 {
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 [EPD4in2::init()](EPD4in2::init()) isn't needed directly afterwards
///
///
/// 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();
/// ```
pub fn new(spi: SPI, cs: CS, busy: BUSY, dc: DC, rst: RST, delay: D) -> Result<Self, E> {
//TODO: width und height anpassbar machen?
let width = 400;
let height = 300;
fn new(spi: SPI, cs: CS, busy: BUSY, dc: DC, rst: RST, delay: D) -> Result<Self, E> {
let width = WIDTH as u16;
let height = HEIGHT as u16;
let mut epd4in2 = EPD4in2 {spi, cs, busy, dc, rst, delay, width, height };
let interface = ConnectionInterface::new(spi, cs, busy, dc, rst, delay);
let color = Color::White;
let mut epd = EPD4in2 {
interface,
width,
height,
color,
};
epd4in2.init()?;
epd.init()?;
Ok(epd4in2)
Ok(epd)
}
/// This initialises the EPD and powers it up
///
/// This function is already called from [EPD4in2::new()](EPD4in2::new())
///
/// This function calls [EPD4in2::reset()](EPD4in2::reset()),
/// so you don't need to call reset your self when trying to wake your device up
/// after setting it to sleep.
pub fn init(&mut self) -> Result<(), E> {
fn init(&mut self) -> Result<(), E> {
// reset the device
self.reset();
@@ -174,7 +150,7 @@ where
// 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
self.send_data(0x17)?; //07 0f 17 1f 27 2F 37 2f
}
// power on
@@ -197,178 +173,16 @@ where
// 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
// 3A 100HZ 29 150Hz 39 200HZ 31 171HZ DEFAULT: 3c 50Hz
self.send_command(Command::PLL_CONTROL)?;
self.send_data(0x3A)?;
Ok(())
}
/// Transmit partial data to the SRAM of the EPD,
/// the final parameter dtm chooses between the 2
/// internal buffers
///
/// Normally it should be dtm2, so use false
///
/// BUFFER needs to be of size: w / 8 * l !
pub fn set_partial_window(&mut self, buffer: &[u8], x: u16, y: u16, w: u16, l: u16, is_dtm1: bool) -> Result<(), E> {
if buffer.len() as u16 != w / 8 * l {
//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 + w - 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 + l - 1) >> 8) as u8)?;
self.send_data((y + l - 1) as u8)?;
self.send_data(0x01)?; // Gates scan both inside and outside of the partial window. (default)
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)
}
// void DisplayFrame(const unsigned char* frame_buffer);
/// Display the frame data from SRAM
/// Uses the SLOW!! full update/refresh
/// Default color: 0xff
///
pub fn display_and_transfer_frame(&mut self, buffer: &[u8], color: Option<u8>) -> Result<(), E>{
let color = color.unwrap_or(0xff);
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)?;
}
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)?;
}
self.delay_ms(2);
self.set_lut()?;
self.send_command(Command::DISPLAY_REFRESH)?;
//TODO: adapt time, is this long delay really needed?
self.delay_ms(10);
self.wait_until_idle();
Ok(())
}
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)
}
/// Displays the frame data from SRAM
pub fn display_frame(&mut self) -> Result<(), E> {
self.set_lut()?;
self.send_command(Command::DISPLAY_REFRESH)?;
self.delay_ms(100);
self.wait_until_idle();
Ok(())
}
/// Same as display_frame(), but with nearly no delay
/// and uses the fast/partial refresh LUT
/// needs more testing!!!
/// maybe delay can be fully removed as wait_until_idle should do
/// the necessary stuff
/// TODO: check delay!!!
/// Displays the frame data from SRAM
#[cfg(feature = "epd4in2_fast_update")]
pub fn display_frame_quick(&mut self) -> Result<(), E> {
self.set_lut_quick()?;
self.send_command(Command::DISPLAY_REFRESH)?;
self.delay_ms(1);
self.wait_until_idle();
Ok(())
}
/// Clears the frame from the buffer
///
/// Set a reset_color if you want a different from the default 0xff
///
/// TODO: should that option be removed? E.g. the struct contains an additional default background value
/// which is settable?
pub fn clear_frame(&mut self, reset_color: Option<Color>) -> Result<(), E> {
let reset_color: Color = reset_color.unwrap_or(Color::White);
self.send_resolution()?;
let size = self.width / 8 * self.height;
self.send_command(Command::DATA_START_TRANSMISSION_1)?;
self.delay_ms(2);
for _ in 0..size {
self.send_data(reset_color.get_byte_value())?;
}
self.delay_ms(2);
self.send_command(Command::DATA_START_TRANSMISSION_2)?;
self.delay_ms(2);
for _ in 0..size {
self.send_data(reset_color.get_byte_value())?;
}
Ok(())
}
/// Let the device enter deep-sleep mode to save power.
///
/// The deep sleep mode returns to standby with a hardware reset.
/// But you can also use [EPD4in2::reset()](EPD4in2::reset()) to awaken.
/// But as you need to power it up once more anyway you can also just directly use [EPD4in2::init()](EPD4in2::init()) for resetting
/// and initialising which already contains the reset
pub fn sleep(&mut self) -> Result<(), E> {
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
@@ -389,172 +203,215 @@ where
Ok(())
}
/// Resets the device.
///
/// Often used to awake the module from deep sleep. See [EPD4in2::sleep()](EPD4in2::sleep())
///
/// TODO: Takes at least 400ms of delay alone, can it be shortened?
pub fn reset(&mut self) {
self.rst.set_low();
fn reset(&mut self) {
self.interface.reset()
}
//TODO: why 200ms? (besides being in the waveshare code)
self.delay_ms(200);
fn delay_ms(&mut self, delay: u16) {
self.interface.delay_ms(delay)
}
self.rst.set_high();
fn update_frame(&mut self, buffer: &[u8]) -> Result<(), E> {
let color_value = self.color.get_byte_value();
//TODO: same as 3 lines above
self.delay_ms(200);
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?
//TODO: make public?
fn set_lut(&mut self) -> Result<(), E> {
self.set_lut_helper(
&LUT_VCOM0,
&LUT_WW,
&LUT_BW,
&LUT_WB,
&LUT_BB)
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")]
#[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)
&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>
{
//vcom
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)?;
//ww --
// LUT WHITE to WHITE
self.send_command(Command::LUT_WHITE_TO_WHITE)?;
self.send_multiple_data(lut_ww)?;
//bw r
// LUT BLACK to WHITE
self.send_command(Command::LUT_BLACK_TO_WHITE)?;
self.send_multiple_data(lut_bw)?;
//wb w
// LUT WHITE to BLACK
self.send_command(Command::LUT_WHITE_TO_BLACK)?;
self.send_multiple_data(lut_wb)?;
//bb b
// LUT BLACK to BLACK
self.send_command(Command::LUT_BLACK_TO_BLACK)?;
self.send_multiple_data(lut_bb)?;
Ok(())
}
/// Basic function for sending [Commands](Command).
///
/// Enables direct interaction with the device with the help of [EPD4in2::send_data()](EPD4in2::send_data())
/// Should rarely be needed!
/// //TODO: make public?
fn send_command(&mut self, command: Command) -> Result<(), E> {
// low for commands
self.dc.set_low();
// Transfer the command over spi
self.with_cs(|epd| {
epd.spi.write(&[command.addr()])
})
}
/// Basic function for sending a single u8 of data over spi
///
/// Enables direct interaction with the device with the help of [EPD4in2::send_command()](EPD4in2::send_command())
///
/// Should rarely be needed!
/// //TODO: make public?
fn send_data(&mut self, val: u8) -> Result<(), E> {
// high for data
self.dc.set_high();
// Transfer data (u8) over spi
self.with_cs(|epd| {
epd.spi.write(&[val])
})
}
/// Basic function for sending an array of u8-values of data over spi
///
/// Enables direct interaction with the device with the help of [EPD4in2::send_command()](EPD4in2::send_command())
///
/// Should rarely be needed!
/// //TODO: make public?
fn send_multiple_data(&mut self, data: &[u8]) -> Result<(), E> {
// high for data
self.dc.set_high();
// Transfer data (u8-array) over spi
self.with_cs(|epd| {
epd.spi.write(data)
})
}
// spi write helper/abstraction function
fn with_cs<F>(&mut self, f: F) -> Result<(), E>
where
F: FnOnce(&mut Self) -> Result<(), E>,
{
// activate spi with cs low
self.cs.set_low();
// transfer spi data
let result = f(self);
// deativate spi with cs high
self.cs.set_high();
// return result
result
}
/// Waits until device isn't busy anymore (busy == HIGH)
///
/// This is normally handled by the more complicated commands themselves,
/// but in the case you send data and commands directly you might need to check
/// if the device is still busy
pub fn wait_until_idle(&mut self) {
//low: busy, high: idle
while self.busy.is_low() {
//TODO: shorten the time? it was 100 in the beginning
self.delay_ms(10);
}
}
/// Abstraction of setting the delay for simpler calls
pub fn delay_ms(&mut self, delay: u16) {
self.delay.delay_ms(delay);
}
}