display: Implement fast refresh (WIP, requires better UI code).

display/firmware/Cargo.lock

  "cortex-m-semihosting 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "embedded-nrf24l01 0.2.0 (git+https://github.com/mgottschlag/embedded-nrf24l01?branch=wip)",
- "epd-waveshare 0.4.0 (git+https://github.com/mgottschlag/epd-waveshare.git?branch=streaming)",
+ "epd-waveshare 0.4.0 (git+https://github.com/mgottschlag/epd-waveshare?branch=wip)",
  "mkl25z4 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "mkl25z4-hal 0.1.0 (git+https://github.com/mgottschlag/mkl25z4-hal)",
  "nb 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 [[package]]
 name = "epd-waveshare"
 version = "0.4.0"
-source = "git+https://github.com/mgottschlag/epd-waveshare.git?branch=streaming#fc18e6f6fa078312879ec978729390ca4a6ab70a"
+source = "git+https://github.com/mgottschlag/epd-waveshare?branch=wip#a24bec5be720c89cedda513a139bc983b0c5e1d0"
 dependencies = [
  "embedded-graphics 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "checksum embedded-graphics 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "40a69991ceb896bd4810a0cf2bcc46fc94b7860573c71f965d8e5b3d66942fed"
 "checksum embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ee4908a155094da7723c2d60d617b820061e3b4efcc3d9e293d206a5a76c170b"
 "checksum embedded-nrf24l01 0.2.0 (git+https://github.com/mgottschlag/embedded-nrf24l01?branch=wip)" = "<none>"
-"checksum epd-waveshare 0.4.0 (git+https://github.com/mgottschlag/epd-waveshare.git?branch=streaming)" = "<none>"
+"checksum epd-waveshare 0.4.0 (git+https://github.com/mgottschlag/epd-waveshare?branch=wip)" = "<none>"
 "checksum freetype-rs 0.24.0 (registry+https://github.com/rust-lang/crates.io-index)" = "340519227cdc8f41c27b3840a02e32dac6102dc314aefe6189cfa355233c445f"
 "checksum freetype-sys 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d48ac0ce366dd47a115ec8e598d7c51b4a974fc52ded5e53a56b31f55f34f3ea"
 "checksum generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c68f0274ae0e023facc3c97b2e00f076be70e254bc851d972503b328db79b2ec"

display/firmware/Cargo.toml

 nb = "0.1.2"
 bme280 = { git = "https://github.com/mgottschlag/bme280-rs", branch = "destroy" }
 embedded-nrf24l01 = { git = "https://github.com/mgottschlag/embedded-nrf24l01", branch = "wip" }
-epd-waveshare = { git = "https://github.com/mgottschlag/epd-waveshare.git", branch = "streaming" }
+epd-waveshare = { git = "https://github.com/mgottschlag/epd-waveshare", branch = "wip" }
 tinygfx = { git = "https://github.com/mgottschlag/tinygfx" }
 protocol = { path = "../../common/rust-protocol" }
 

display/firmware/src/display.rs

 use embedded_hal::blocking::delay::DelayUs;
 use embedded_hal::digital::v2::OutputPin;
 use epd_waveshare::epd4in2::EPD4in2;
-use epd_waveshare::prelude::{DisplayStream, WaveshareDisplay};
+use epd_waveshare::prelude::{Color, DisplayStream, RefreshLUT, WaveshareDisplay};
 use mkl25z4_hal::time::CopyableMonoTimer;
 use tinygfx::color::BlackWhite::{self, Black, White};
 use tinygfx::image::{MonoBitmapImage, MonoImageData};
     DisplayBmeSpi, DisplayBusy, DisplayCs, DisplayDc, DisplayPins, DisplayPwr, DisplayRst,
 };
 
-pub struct DisplayState {
-    // TODO
+const FULL_REFRESH_INTERVAL: usize = 5;
+
+pub struct DisplayState {}
+
+impl DisplayState {
+    pub fn new() -> DisplayState {
+        DisplayState {}
+    }
 }
 
 pub struct Display {
     pwr: DisplayPwr,
     epd: EPD4in2<DisplayBmeSpi, DisplayCs, DisplayBusy, DisplayDc, DisplayRst>,
+    refresh_counter: usize,
 }
 
 impl Display {
         // Disable power again.
         pins.pwr.set_high().ok();
 
-        Display { pwr: pins.pwr, epd }
+        Display {
+            pwr: pins.pwr,
+            epd,
+            refresh_counter: 0,
+        }
     }
 
     pub fn update(
         });
         frame.mirror_x(true);
         frame.mirror_y(true);
-        //self.epd.set_background_color(Color::Black);
         let checkerboard = TinyGfxStream::new(frame);
+
+        // We perform a full update every FULL_REFRESH_INTERVAL frames.
+        // TODO: Proper background.
+        self.epd.set_background_color(Color::White);
+        if self.refresh_counter == 0 {
+            self.refresh_counter = FULL_REFRESH_INTERVAL - 1;
+            self.epd.set_lut(spi, Some(RefreshLUT::FULL)).unwrap();
+        } else {
+            self.refresh_counter -= 1;
+            self.epd.set_lut(spi, Some(RefreshLUT::QUICK)).unwrap();
+        }
+
         self.epd.update_frame_stream(spi, checkerboard).unwrap();
         self.epd.display_frame(spi).unwrap();
 

display/firmware/src/main.rs

                 bathroom: None,
                 pressure: None,
             },
-            display_state: DisplayState{
-                // TODO
-            },
+            display_state: DisplayState::new(),
             display,
             display_bme_spi: Some(pins.display_bme_spi),
             bme_pins: Some(pins.bme),