diff --git a/examples/embedded_linux/src/main.rs b/examples/embedded_linux/src/main.rs
index 388b535..ced4d9d 100644
--- a/examples/embedded_linux/src/main.rs
+++ b/examples/embedded_linux/src/main.rs
@@ -5,7 +5,7 @@ extern crate linux_embedded_hal as lin_hal;
 extern crate eink_waveshare_rs;
 
 
-use eink_waveshare_rs::{epd4in2::EPD4in2, drawing::{Graphics, color::Color}};
+use eink_waveshare_rs::{epd4in2::EPD4in2, drawing::{Graphics, color::Color}, interface::WaveshareInterface};
 
 use lin_hal::spidev::{self, SpidevOptions};
 use lin_hal::{Pin, Spidev};
@@ -120,27 +120,27 @@ fn main() {
 
     graphics.draw_vertical_line(200, 50, 200, &Color::Black);
 
-    epd4in2.display_and_transfer_frame(graphics.get_buffer(), None).expect("display and transfer error");
+    epd4in2.update_and_display_frame(graphics.get_buffer()).expect("display and transfer error");
  
     epd4in2.delay_ms(3000);
 
-    epd4in2.clear_frame(None).expect("clear frame error");
+    epd4in2.clear_frame().expect("clear frame error");
 
     //Test fast updating a bit more
     let mut small_buffer = [0x00; 128];
     let mut circle_graphics = Graphics::new(32,32, &mut small_buffer);
     circle_graphics.draw_circle(16,16, 10, &Color::Black);
 
-    epd4in2.set_partial_window(circle_graphics.get_buffer(), 16,16, 32, 32, false).expect("Partial Window Error");
+    epd4in2.update_partial_frame(circle_graphics.get_buffer(), 16,16, 32, 32).expect("Partial Window Error");
     epd4in2.display_frame().expect("Display Frame Error");
 
-    epd4in2.set_partial_window(circle_graphics.get_buffer(), 128,64, 32, 32, false).expect("Partial Window Error");
+    epd4in2.update_partial_frame(circle_graphics.get_buffer(), 128,64, 32, 32).expect("Partial Window Error");
     epd4in2.display_frame().expect("Display Frame Error");
 
-    epd4in2.set_partial_window(circle_graphics.get_buffer(), 320,24, 32, 32, false).expect("Partial Window Error");
+    epd4in2.update_partial_frame(circle_graphics.get_buffer(), 320,24, 32, 32).expect("Partial Window Error");
     epd4in2.display_frame().expect("Display Frame Error");
 
-    epd4in2.set_partial_window(circle_graphics.get_buffer(), 160,240, 32, 32, false).expect("Partial Window Error");
+    epd4in2.update_partial_frame(circle_graphics.get_buffer(), 160,240, 32, 32).expect("Partial Window Error");
     epd4in2.display_frame().expect("Display Frame Error");
 
     epd4in2.delay_ms(3000);
@@ -152,7 +152,7 @@ fn main() {
     graphics.draw_string_8x8(16, 16, "hello", &Color::Black);
     graphics.draw_char_8x8(250, 250, '#', &Color::Black);
     graphics.draw_char_8x8(300, 16, '7', &Color::Black);
-    epd4in2.display_and_transfer_frame(graphics.get_buffer(), None).expect("display and transfer error");
+    epd4in2.update_and_display_frame(graphics.get_buffer()).expect("display and transfer error");
 
     epd4in2.delay_ms(3000);
 
diff --git a/src/epd2in9/command.rs b/src/epd2in9/command.rs
index 8eed1c7..b777e95 100644
--- a/src/epd2in9/command.rs
+++ b/src/epd2in9/command.rs
@@ -10,7 +10,7 @@ use interface;
 /// For more infos about the addresses and what they are doing look into the pdfs 
 /// 
 /// The description of the single commands is mostly taken from IL0398.pdf
-#[allow(dead_code)]
+//#[allow(dead_code)]
 #[allow(non_camel_case_types)]
 #[derive(Copy, Clone)]
 pub enum Command {
@@ -38,6 +38,39 @@ pub enum Command {
 	/// 		A[0] = 1: Enter Deep Sleep Mode
 	DEEP_SLEEP_MODE = 0x10,
 	// /// Data Entry mode setting
+	DATA_ENTRY_MODE_SETTING = 0x11,
+
+	SW_RESET = 0x12,
+
+	TEMPERATURE_SENSOR_CONTROL = 0x1A,
+
+	MASTER_ACTIVATION = 0x20,
+
+	DISPLAY_UPDATE_CONTROL_1 = 0x21,
+
+	DISPLAY_UPDATE_CONTROL_2 = 0x22,
+
+	WRITE_RAM = 0x24,
+
+	WRITE_VCOM_REGISTER = 0x2C,
+
+	WRITE_LUT_REGISTER = 0x32,
+
+	SET_DUMMY_LINE_PERIOD = 0x3A,
+
+	SET_GATE_TIME = 0x3B,
+
+	BORDER_WAVEFORM_CONTROL = 0x3C,
+
+	SET_RAM_X_ADDRESS_START_END_POSITION = 0x44,
+
+	SET_RAM_Y_ADDRESS_START_END_POSITION = 0x45,
+
+	SET_RAM_X_ADDRESS_COUNTER = 0x4E,
+
+	SET_RAM_Y_ADDRESS_COUNTER = 0x4F,
+
+	TERMINATE_COMMANDS_AND_FRAME_WRITE = 0xFF
 }
 
 
diff --git a/src/epd2in9/mod.rs b/src/epd2in9/mod.rs
index ab8e35d..d1431d9 100644
--- a/src/epd2in9/mod.rs
+++ b/src/epd2in9/mod.rs
@@ -62,21 +62,23 @@ use self::constants::*;
 use drawing::color::Color;
 
 pub mod command;
-pub use command::Command as Command;
+pub use self::command::Command;
 
 use interface::*;
 
-use interface::data_interface::DataInterface;
+use interface::connection_interface::ConnectionInterface;
 
 /// EPD2in9 driver
 ///
 pub struct EPD2in9<SPI, CS, BUSY, DC, RST, D> {
     /// SPI
-    interface: DataInterface<SPI, CS, BUSY, DC, RST, D>,
+    interface: ConnectionInterface<SPI, CS, BUSY, DC, RST, D>,
     /// Width
     width: u32,
     /// Height
-    height: u32,   
+    height: u32,  
+    /// Color
+    color: Color, 
 }
 
 impl<SPI, CS, BUSY, DC, RST, D, E> EPD2in9<SPI, CS, BUSY, DC, RST, D>
@@ -122,9 +124,11 @@ where
         let width = WIDTH as u32;
         let height = HEIGHT as u32;
 
-        let mut interface = DataInterface::new(spi, cs, busy, dc, rst, delay);
+        let interface = ConnectionInterface::new(spi, cs, busy, dc, rst, delay);
 
-        let mut epd = EPD2in9 {interface, width, height};
+        let color = Color::White;
+
+        let mut epd = EPD2in9 {interface, width, height, color};
 
 
         epd.init()?;
@@ -135,11 +139,26 @@ where
 
 
     fn init(&mut self) -> Result<(), E> {
+        self.reset();
+
+
+
+
         unimplemented!()
     }
+
     fn sleep(&mut self) -> Result<(), E> {
-        unimplemented!()
+
+        self.interface.send_command(Command::DEEP_SLEEP_MODE)?;
+        // 0x00 for Normal mode (Power on Reset), 0x01 for Deep Sleep Mode
+        //TODO: is 0x00 needed here?
+        self.interface.send_data(0x00)?;
+
+        self.interface.wait_until_idle(false);
+        Ok(())
     }
+
+
     fn reset(&mut self) {
         self.interface.reset()
     }
@@ -165,6 +184,9 @@ where
 
     // TODO: add this abstraction function
     // fn update_and_display_frame(&mut self, buffer: &[u8]) -> Result<(), E>;
+    fn update_and_display_frame(&mut self, buffer: &[u8]) -> Result<(), E>{
+        unimplemented!()
+    }
 
     
     fn clear_frame(&mut self) -> Result<(), E>{
@@ -173,7 +195,7 @@ where
 
     /// Sets the backgroundcolor for various commands like [WaveshareInterface::clear_frame()](clear_frame())
     fn set_background_color(&mut self, color: Color){
-        unimplemented!()
+        self.color = color;
     }
 
 }
diff --git a/src/epd4in2/command.rs b/src/epd4in2/command.rs
index c81bd79..a73e43e 100644
--- a/src/epd4in2/command.rs
+++ b/src/epd4in2/command.rs
@@ -1,5 +1,5 @@
 //! SPI Commands for the Waveshare 4.2" E-Ink Display
-
+use interface;
 /// EPD4IN2 commands
 /// 
 /// Should rarely (never?) be needed directly.
@@ -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);        
     }
 }
\ No newline at end of file
diff --git a/src/epd4in2/lut.rs b/src/epd4in2/constants.rs
similarity index 97%
rename from src/epd4in2/lut.rs
rename to src/epd4in2/constants.rs
index 55c7d39..ea703e5 100644
--- a/src/epd4in2/lut.rs
+++ b/src/epd4in2/constants.rs
@@ -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,        
@@ -8,6 +11,7 @@ pub(crate) const LUT_VCOM0: [u8; 44] = [
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 ];
 
+
 pub(crate) const LUT_VCOM0_QUICK: [u8; 44] = [
 0x00, 0x0E, 0x00, 0x00, 0x00, 0x01,        
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,        
@@ -18,6 +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,
@@ -28,6 +33,7 @@ pub(crate) const LUT_WW: [u8; 42] =[
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 ];
 
+
 pub(crate) const LUT_WW_QUICK: [u8; 42] =[
 0xA0, 0x0E, 0x00, 0x00, 0x00, 0x01,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -49,6 +55,7 @@ pub(crate) const LUT_BW: [u8; 42] =[
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,      
 ];
 
+
 pub(crate) const LUT_BW_QUICK: [u8; 42] =[
 0xA0, 0x0E, 0x00, 0x00, 0x00, 0x01,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -70,6 +77,7 @@ pub(crate) const LUT_BB: [u8; 42] =[
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,             
 ];
 
+
 pub(crate) const LUT_BB_QUICK: [u8; 42] =[
 0x50, 0x0E, 0x00, 0x00, 0x00, 0x01,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -91,6 +99,7 @@ pub(crate) const LUT_WB: [u8; 42] =[
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,            
 ];
 
+
 pub(crate) const LUT_WB_QUICK: [u8; 42] =[
 0x50, 0x0E, 0x00, 0x00, 0x00, 0x01,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
diff --git a/src/epd4in2/mod.rs b/src/epd4in2/mod.rs
index 3f53d9a..c5a260b 100644
--- a/src/epd4in2/mod.rs
+++ b/src/epd4in2/mod.rs
@@ -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
@@ -30,82 +30,64 @@
 //! 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 Partial Drawing can "destroy" your display.
 //! It needs more testing first.
 
-
 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,
+    width: u32,
     /// Height
-    height: u16,   
+    height: u32,
+    /// 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,
@@ -113,54 +95,48 @@ where
     RST: OutputPin,
     D: DelayUs<u16> + DelayMs<u16>,
 {
-    /// Get the width of the display
-    pub fn get_width(&self) -> u16 {
+    fn get_width(&self) -> u32 {
         self.width
     }
 
-    /// Get the height of the display
-    pub fn get_height(&self) -> u16 {
+    fn get_height(&self) -> u32 {
         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
-    /// 
+    ///
     /// # 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;
-
-        let mut epd4in2 = EPD4in2 {spi, cs, busy, dc, rst, delay, width, height };
-
-        epd4in2.init()?;
-
-        Ok(epd4in2)
+    fn new(spi: SPI, cs: CS, busy: BUSY, dc: DC, rst: RST, delay: D) -> Result<Self, E> {
+        let width = WIDTH as u32;
+        let height = HEIGHT as u32;
+
+        let interface = ConnectionInterface::new(spi, cs, busy, dc, rst, delay);
+        let color = Color::White;
+        let mut epd = EPD4in2 {
+            interface,
+            width,
+            height,
+            color,
+        };
+
+        epd.init()?;
+
+        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();
 
@@ -175,7 +151,7 @@ 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
@@ -198,68 +174,46 @@ 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)?;
 
+        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);
 
-
-
-
-    
-    /// 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::POWER_SETTING)?; //VG&VS to 0V fast
+        for _ in 0..4 {
+            self.send_data(0x00)?;
         }
+        self.delay_ms(100);
 
-        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_command(Command::POWER_OFF)?;
+        self.wait_until_idle();
+        self.send_command(Command::DEEP_SLEEP)?;
+        self.send_data(0xA5)?;
 
-        self.send_multiple_data(buffer)?;
+        Ok(())
+    }
 
-        self.send_command(Command::PARTIAL_OUT)
+    fn reset(&mut self) {
+        self.interface.reset()
     }
 
-    
+    fn delay_ms(&mut self, delay: u16) {
+        self.interface.delay_ms(delay)
+    }
 
-    // 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);
+    fn update_frame(&mut self, buffer: &[u8]) -> Result<(), E> {
+        let color_value = self.color.get_byte_value();
 
         self.send_resolution()?;
 
@@ -272,10 +226,9 @@ where
         //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.send_data(color_value)?;
         }
         self.delay_ms(2);
 
@@ -284,73 +237,79 @@ where
         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();
+    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::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)
-    }
+        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)?;
 
-    /// Displays the frame data from SRAM
-    pub fn display_frame(&mut self) -> Result<(), E> {
-        self.set_lut()?;
-        self.send_command(Command::DISPLAY_REFRESH)?;
+        self.send_data((y >> 8) as u8)?;
+        self.send_data(y as u8)?;
 
-        self.delay_ms(100);
-        self.wait_until_idle();
-        Ok(())
+        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)
     }
 
-    /// 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
-    pub fn display_frame_quick(&mut self) -> Result<(), E> {
-        self.set_lut_quick()?;
+    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.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);
+    // 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(reset_color.get_byte_value())?;
+            self.send_data(color_value)?;
         }
 
         self.delay_ms(2);
@@ -358,203 +317,101 @@ where
         self.send_command(Command::DATA_START_TRANSMISSION_2)?;
         self.delay_ms(2);
         for _ in 0..size {
-            self.send_data(reset_color.get_byte_value())?;
+            self.send_data(color_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> {
-        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(())
+    /// Sets the backgroundcolor for various commands like [WaveshareInterface::clear_frame()](clear_frame())
+    fn set_background_color(&mut self, color: Color) {
+        self.color = color;
     }
+}
 
-    /// 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();
+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)
+    }
 
-        //TODO: why 200ms? (besides being in the waveshare code)
-        self.delay_ms(200);
+    fn send_data(&mut self, val: u8) -> Result<(), E> {
+        self.interface.send_data(val)
+    }
 
-        self.rst.set_high();
+    fn send_multiple_data(&mut self, data: &[u8]) -> Result<(), E> {
+        self.interface.send_multiple_data(data)
+    }
 
-        //TODO: same as 3 lines above
-        self.delay_ms(200);
+    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? 
+    ///
+    /// Is automatically done by [EPD4in2::display_frame_quick()](EPD4in2::display_frame_quick())
+    /// //TODO: make public?
     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);
-    }
 }
-
-
-
-
-
-
-
-
-
-
-
-
-
diff --git a/src/interface/data_interface.rs b/src/interface/connection_interface.rs
similarity index 81%
rename from src/interface/data_interface.rs
rename to src/interface/connection_interface.rs
index 2c50617..bbd7b4c 100644
--- a/src/interface/data_interface.rs
+++ b/src/interface/connection_interface.rs
@@ -10,7 +10,7 @@ use interface::Command;
 
 /// EPD4in2 driver
 ///
-pub(crate) struct DataInterface<SPI, CS, BUSY, DC, RST, D> {
+pub(crate) struct ConnectionInterface<SPI, CS, BUSY, DC, RST, D> {
     /// SPI
     spi: SPI,
     /// CS for SPI
@@ -26,7 +26,7 @@ pub(crate) struct DataInterface<SPI, CS, BUSY, DC, RST, D> {
 }
 
 
-impl<SPI, CS, BUSY, DC, RST, D, E> DataInterface<SPI, CS, BUSY, DC, RST, D>
+impl<SPI, CS, BUSY, DC, RST, D, E> ConnectionInterface<SPI, CS, BUSY, DC, RST, D>
 where 
     SPI: Write<u8, Error = E>,
     CS: OutputPin,
@@ -36,12 +36,12 @@ where
     D: DelayUs<u16> + DelayMs<u16>,
 {
     pub(crate) fn new(spi: SPI, cs: CS, busy: BUSY, dc: DC, rst: RST, delay: D) -> Self {
-        DataInterface {spi, cs, busy, dc, rst, delay }
+        ConnectionInterface {spi, cs, busy, dc, rst, delay }
     }
     
     /// Basic function for sending [Commands](Command). 
     /// 
-    /// Enables direct interaction with the device with the help of [EPD4in2::send_data()](EPD4in2::send_data())
+    /// Enables direct interaction with the device with the help of [send_data()](ConnectionInterface::send_data())
     /// Should rarely be needed!
     /// //TODO: make public? 
     pub(crate) fn send_command<T: Command>(&mut self, command: T) -> Result<(), E> {
@@ -56,7 +56,7 @@ where
 
     /// 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())
+    /// Enables direct interaction with the device with the help of [Esend_command()](ConnectionInterface::send_command())
     /// 
     /// Should rarely be needed!
     /// //TODO: make public? 
@@ -72,7 +72,7 @@ where
 
     /// 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())
+    /// Enables direct interaction with the device with the help of [send_command()](EPD4in2::send_command())
     /// 
     /// Should rarely be needed!
     /// //TODO: make public? 
@@ -107,11 +107,18 @@ where
     /// 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(crate) fn wait_until_idle(&mut self) {
+    /// 
+    /// is_busy_low
+    ///     - TRUE for epd4in2, epd1in54, epd2in13, epd2in7, epd5in83, epd7in5
+    /// 
+    ///     - FALSE for epd2in9
+    /// Most likely there was a mistake with the 2in9 busy connection
+    pub(crate) fn wait_until_idle(&mut self, is_busy_low: bool) {
+        self.delay_ms(1);
         //low: busy, high: idle
-        while self.busy.is_low() {
+        while (is_busy_low && self.busy.is_low()) || (!is_busy_low && self.busy.is_high()) {
             //TODO: shorten the time? it was 100 in the beginning
-            self.delay_ms(10);
+            self.delay_ms(5);
         }
     }
 
diff --git a/src/interface/mod.rs b/src/interface/mod.rs
index e190cf9..aab00e7 100644
--- a/src/interface/mod.rs
+++ b/src/interface/mod.rs
@@ -9,7 +9,7 @@ use hal::{
 
 use drawing::color::Color;
 
-pub mod data_interface;
+pub mod connection_interface;
 
 //TODO: test spi mode
 /// SPI mode - 
@@ -25,6 +25,18 @@ pub(crate) trait Command {
     fn address(self) -> u8;
 }
 
+
+//TODO add LUT trait with set_fast_lut
+// and set_manual_lut and set_normal_lut or sth like that
+// for partial updates
+
+pub trait LUTSupport<Error> {
+    fn set_lut(&mut self) -> Result<(), Error>;
+    fn set_lut_quick(&mut self) -> Result<(), Error>;
+    fn set_lut_manual(&mut self, data: &[u8]) -> Result<(), Error>;
+}
+
+
 pub trait WaveshareInterface<SPI, CS, BUSY, DC, RST, D, E>
     where 
         SPI: Write<u8, Error = E>,
@@ -63,16 +75,26 @@ pub trait WaveshareInterface<SPI, CS, BUSY, DC, RST, D, E>
     fn init(&mut self) -> Result<(), E>;
 
 
-
+    // void DisplayFrame(const unsigned char* frame_buffer);
+    /// Transmit a full frame to the SRAM of the DPD
+    /// 
     fn update_frame(&mut self, buffer: &[u8]) -> Result<(), E>;
 
+    //TODO: is dtm always used?
+    /// 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 !
     fn update_partial_frame(&mut self, buffer: &[u8], x: u16, y: u16, width: u16, height: u16) -> Result<(), E>;
 
     /// Displays the frame data from SRAM
     fn display_frame(&mut self) -> Result<(), E>;
 
     // TODO: add this abstraction function
-    // fn update_and_display_frame(&mut self, buffer: &[u8]) -> Result<(), E>;
+    fn update_and_display_frame(&mut self, buffer: &[u8]) -> Result<(), E>;
 
     /// Clears the frame from the buffer
     /// 
@@ -102,10 +124,7 @@ pub trait WaveshareInterface<SPI, CS, BUSY, DC, RST, D, E>
     fn delay_ms(&mut self, delay: u16);
 
     /*
-    -display_frame
-    -clear_frame
-    -set_full_frame
-    -set_partial_frame
+
 
     //
     -set_quick_lut?
diff --git a/src/lib.rs b/src/lib.rs
index 4f8851f..5b3e1e3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -58,7 +58,8 @@ use hal::{
 
 pub mod drawing;
 pub mod epd4in2;
-use epd4in2::*;
+
+
 
 pub mod epd2in9;