Added documentation and changelog entries.

CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Added support for positive and negatives modes of rendering in TriColor display in #92 (thanks to @akashihi)
+- Added Epd 5in83 V2 (B) support in #92 (thanks to @akashihi)
+
 ### Changed
 
 ### Fixed

src/epd5in83b_v2/graphics.rs

@@ -82,8 +82,8 @@ mod tests {
     use super::*;
     use crate::color::TriColor::Black;
     use crate::color::TriColor::Color;
-    use crate::graphics::DisplayRotation;
     use crate::epd5in83b_v2;
+    use crate::graphics::DisplayRotation;
     use embedded_graphics::{
         prelude::*,
         primitives::{Line, PrimitiveStyle},

src/graphics.rs

@@ -25,6 +25,14 @@ impl Default for DisplayRotation {
 }
 
 /// Display specific pixel output configuration
+///
+/// Different chromatic displays differently treat the bits in chromatic color planes.
+/// Some of them ([crate::epd2in13bc]) will render a color pixel if bit is set for that pixel,
+/// which is a [DisplayColorRendering::Positive] mode.
+///
+/// Other displays, like [crate::epd5in83b_v2] in opposite, will draw color pixel if bit is
+/// cleared for that pixel, which is a [DisplayColorRendering::Negative] mode.
+///
 #[derive(Clone, Copy)]
 pub enum DisplayColorRendering {
     /// Positive: chromatic doesn't override white, white bit cleared for black, white bit set for white, both bits set for chromatic
@@ -133,6 +141,15 @@ pub trait TriDisplay: DrawTarget<Color = TriColor> {
     /// Helperfunction for the Embedded Graphics draw trait
     ///
     /// Becomes uneccesary when const_generics become stablised
+    ///
+    /// # Arguments
+    ///
+    /// * `width` - Screen width in pixels
+    /// * `height` - Screen height in pixels
+    /// * `pixel` - Pixel to draw
+    /// * `rendering` - Chooses rendering mode for the color plane,
+    ///  whether it is positive or negative. Check [DisplayColorRendering] for details.
+    ///  This is a hardware defined setting, that needs to be checked from the datasheet.
     fn draw_helper_tri(
         &mut self,
         width: u32,