Trying to make partial update

epd-waveshare/src/epd1in54/mod.rs

@@ -289,7 +289,7 @@ where
     }
 
     fn wait_until_idle(&mut self, _spi: &mut SPI, delay: &mut DELAY) -> Result<(), SPI::Error> {
-        self.interface.wait_until_idle(delay, IS_BUSY_LOW);
+        let _ = self.interface.wait_until_idle(delay, IS_BUSY_LOW);
         Ok(())
     }
 }

epd-waveshare/src/epd3in7/mod.rs

@@ -143,6 +143,71 @@ where
     }
 }
 
+impl<SPI, BUSY, DC, RST, DELAY> EPD3in7<SPI, BUSY, DC, RST, DELAY>
+where
+    SPI: SpiDevice,
+    BUSY: InputPin,
+    DC: OutputPin,
+    RST: OutputPin,
+    DELAY: DelayNs,
+{
+    pub(crate) fn set_ram_area(
+        &mut self,
+        spi: &mut SPI,
+        delay: &mut DELAY,
+        start_x: u32,
+        start_y: u32,
+        end_x: u32,
+        end_y: u32,
+    ) -> Result<(), SPI::Error> {
+        self.wait_until_idle(spi, delay)?;
+        assert!(start_x < end_x);
+        assert!(start_y < end_y);
+
+        // x is positioned in bytes, so the last 3 bits which show the position inside a byte in the ram
+        // aren't relevant
+        self.interface.cmd_with_data(
+            spi,
+            Command::SetRamXAddressStartEndPosition,
+            &[(start_x >> 3) as u8, (end_x >> 3) as u8],
+        )?;
+
+        // 2 Databytes: A[7:0] & 0..A[8] for each - start and end
+        self.interface.cmd_with_data(
+            spi,
+            Command::SetRamYAddressStartEndPosition,
+            &[
+                start_y as u8,
+                (start_y >> 8) as u8,
+                end_y as u8,
+                (end_y >> 8) as u8,
+            ],
+        )?;
+        Ok(())
+    }
+
+    pub(crate) fn set_ram_counter(
+        &mut self,
+        spi: &mut SPI,
+        delay: &mut DELAY,
+        x: u32,
+        y: u32,
+    ) -> Result<(), SPI::Error> {
+        self.wait_until_idle(spi, delay)?;
+        // x is positioned in bytes, so the last 3 bits which show the position inside a byte in the ram
+        // aren't relevant
+        self.interface
+            .cmd_with_data(spi, Command::SetRamXAddressCounter, &[(x >> 3) as u8])?;
+
+        // 2 Databytes: A[7:0] & 0..A[8]
+        self.interface.cmd_with_data(
+            spi,
+            Command::SetRamYAddressCounter,
+            &[y as u8, (y >> 8) as u8],
+        )?;
+        Ok(())
+    }
+}
 impl<SPI, BUSY, DC, RST, DELAY> WaveshareDisplay<SPI, BUSY, DC, RST, DELAY>
     for EPD3in7<SPI, BUSY, DC, RST, DELAY>
 where
@@ -260,12 +325,36 @@ where
         width: u32,
         height: u32,
     ) -> Result<(), SPI::Error> {
+        let i = &mut self.interface;
+        i.cmd(spi, Command::SetRamXAddressStartEndPosition);
+        i.data(spi, &[(x >> 8) as u8])?;
+        let tmp = x & 0xf8;
+        i.data(spi, &[tmp as u8])?; // x should be the multiple of 8, the last 3 bit will always be ignored
+        let tmp = tmp + width - 1;
+        i.data(spi, &[(tmp >> 8) as u8])?;
+        i.data(spi, &[(tmp | 0x07) as u8])?;
+
+        i.cmd(spi, Command::SetRamYAddressStartEndPosition);
+        i.data(spi, &[(y >> 8) as u8])?;
+        i.data(spi, &[y as u8])?;
+        i.data(spi, &[((y + height - 1) >> 8) as u8])?;
+        i.data(spi, &[(y + height - 1) as u8])?;
+
+        i.cmd_with_data(spi, Command::WriteRam, buffer);
+
+        //load lut 2
+        i.cmd_with_data(spi, Command::WriteLutRegister, &LUT_1GRAY_DU);
+
+        i.cmd(spi, Command::DisplayUpdateSequence);
+        i.wait_until_idle(delay, IS_BUSY_LOW);
+        /*
         self.wait_until_idle(spi, delay)?;
         self.set_ram_area(spi, delay, x, y, x + width, y + height)?;
         self.set_ram_counter(spi, delay, x, y)?;
 
         self.interface
             .cmd_with_data(spi, Command::WriteRam, buffer)?;
+        */
         Ok(())
     }
 

src/apps/maze_game.rs

@@ -112,10 +112,11 @@ impl App for MazeGame {
     }
 
     fn draw(&self, ctx: &mut Context) {
+        /*
         self.draw_walls(ctx);
-        self.draw_player(ctx);
+        self.draw_player(ctx);*/
         // FIXME: Partial update
-        /*let Some(old) = &self.old_player else {
+        let Some(old) = &self.old_player else {
             self.draw_walls(ctx);
             self.draw_player(ctx);
             return;
@@ -123,12 +124,19 @@ impl App for MazeGame {
         ctx.epaper.partial_update(
             *old,
             Size {
-                width: 0,
+                width: 1,
-                height: 0,
+                height: 1,
             },
             &[Color::White as u8],
         );
-        self.draw_player(ctx);*/
+        ctx.epaper.partial_update(
+            self.player,
+            Size {
+                width: 1,
+                height: 1,
+            },
+            &[Color::Black as u8],
+        );
     }
 
     fn update(&mut self, ctx: &mut Context) -> Option<Action> {

src/apps/mod.rs

@@ -45,7 +45,9 @@ impl Application {
             Self::Menu(menu) => menu.draw(ctx),
             Self::Maze(maze) => maze.draw(ctx),
         };
-        ctx.epaper.full_update();
+        if full {
+            ctx.epaper.full_update();
+        }
     }
 
     pub fn update_and_draw(&mut self, ctx: &mut Context, trng: &mut Trng) {