Add documentation

src/epd1in54b/mod.rs

@@ -1,3 +1,5 @@
+//! A simple Driver for the Waveshare 1.54" (B) E-Ink Display via SPI
+
 use embedded_hal::{
     blocking::{delay::*, spi::Write},
     digital::*,

src/traits.rs

@@ -52,6 +52,8 @@ where
     ) -> Result<(), SPI::Error>;
 }
 
+
+/// Functions to interact with two color panels
 pub trait WaveshareTwoColorDisplay<SPI, CS, BUSY, DC, RST>:
     WaveshareDisplay<SPI, CS, BUSY, DC, RST>
 where
@@ -61,6 +63,7 @@ where
     DC: OutputPin,
     RST: OutputPin,
 {
+    /// Update both color planes
     fn update_both_planes(
         &mut self,
         spi: &mut SPI,