From 66f70b3244ca61604a0275fafde8d519e3a0389c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20Gro=C3=9F?=
 <christoph.gross@student.uni-tuebingen.de>
Date: Mon, 16 Jul 2018 12:37:39 +0200
Subject: [PATCH] Hide the Fast Update which possible might lead to
 Ghosting/Burn-in effects behind a feature gate

---
 Cargo.toml         | 5 +++++
 src/epd4in2/lut.rs | 5 +++++
 src/epd4in2/mod.rs | 8 ++++----
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 03689f8..2b5c596 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,11 @@ name = "eink_waveshare_rs"
 version = "0.1.0"
 authors = ["Christoph Groß <christoph.gross@student.uni-tuebingen.de>"]
 
+
+[features]
+default = []
+epd4in2_fast_update = []
+
 [dependencies]
 
 
diff --git a/src/epd4in2/lut.rs b/src/epd4in2/lut.rs
index 55c7d39..ab032a5 100644
--- a/src/epd4in2/lut.rs
+++ b/src/epd4in2/lut.rs
@@ -8,6 +8,7 @@ pub(crate) const LUT_VCOM0: [u8; 44] = [
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 ];
 
+#[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,        
@@ -28,6 +29,7 @@ pub(crate) const LUT_WW: [u8; 42] =[
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 ];
 
+#[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,
@@ -49,6 +51,7 @@ pub(crate) const LUT_BW: [u8; 42] =[
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,      
 ];
 
+#[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,
@@ -70,6 +73,7 @@ pub(crate) const LUT_BB: [u8; 42] =[
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,             
 ];
 
+#[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,
@@ -91,6 +95,7 @@ pub(crate) const LUT_WB: [u8; 42] =[
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,            
 ];
 
+#[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,
diff --git a/src/epd4in2/mod.rs b/src/epd4in2/mod.rs
index 3f53d9a..89bf400 100644
--- a/src/epd4in2/mod.rs
+++ b/src/epd4in2/mod.rs
@@ -44,8 +44,7 @@
 //! 
 //! 
 //!
-//! BE CAREFUL! The Partial Drawing can "destroy" your display.
-//! It needs more testing first.
+//! BE CAREFUL! The screen can get ghosting/burn-ins through the Partial Fast Update Drawing.
 
 
 use hal::{
@@ -268,7 +267,6 @@ where
 
         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)
-        //oldTODO is this really a command here or shouldn't that be data?
         //self.send_command_u8(0x97)?; //VBDF 17|D7 VBDW 97  VBDB 57  VBDF F7  VBDW 77  VBDB 37  VBDR B7
         self.send_data(0x97)?;
 
@@ -324,6 +322,7 @@ where
     /// 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)?;
@@ -423,7 +422,8 @@ where
     /// 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? 
+    /// //TODO: make public?
+    #[cfg(feature = "epd4in2_fast_update")] 
     fn set_lut_quick(&mut self) -> Result<(), E> {
         self.set_lut_helper(
             &LUT_VCOM0_QUICK,