WIP still some strange behavior with partial handling.

src/epd2in13_v2/mod.rs

@@ -215,6 +215,7 @@ where
         Ok(())
     }
 
+    /// Beware that this does not work well with the screen partial refresh feature.
     fn update_partial_frame(
         &mut self,
         spi: &mut SPI,
@@ -226,6 +227,8 @@ where
     ) -> Result<(), SPI::Error> {
         assert!((width * height / 8) as usize == buffer.len());
 
+        assert!(self.refresh == RefreshLUT::FULL);
+
         self.set_ram_area(spi, x, y, x + width, y + height)?;
         self.set_ram_address_counters(spi, x, y)?;
 
@@ -249,6 +252,16 @@ where
         }
         self.command(spi, Command::MASTER_ACTIVATION)?;
         self.wait_until_idle();
+
+        // If partial refresh, swap the buffer so that the current buffer
+        // becomes the new base for comparison.
+        // if self.refresh == RefreshLUT::QUICK {
+        //     // self.set_partial_base_buffer(spi, buffer )?;
+        //     self.set_display_update_control_2(spi, DisplayUpdateControl2::new().swap_ram())?;
+        //     self.command(spi, Command::MASTER_ACTIVATION)?;
+        //     self.wait_until_idle();
+        // }
+
         Ok(())
     }
 
@@ -259,15 +272,15 @@ where
         // If partial refresh, swap the buffer so that the current buffer
         // becomes the new base for comparison.
         if self.refresh == RefreshLUT::QUICK {
-            self.set_display_update_control_2(spi, DisplayUpdateControl2::new().swap_ram())?;
+            self.set_partial_base_buffer(spi, buffer)?;
+            //self.set_display_update_control_2(spi, DisplayUpdateControl2::new().swap_ram())?;
             self.command(spi, Command::MASTER_ACTIVATION)?;
             self.wait_until_idle();
 
             // We still need to do this as current RAM nows holds the previous
             // reference. If we use the `update_partial_frame()` then we may
             // end-up with old data.
-            // FIXME: This needs to be tested.
-            self.update_frame(spi, buffer)?;
+            // self.update_frame(spi, buffer)?;
         }
         Ok(())
     }
@@ -278,7 +291,6 @@ where
         self.command(spi, Command::WRITE_RAM)?;
         self.interface
             .data_x_times(spi, color, WIDTH * HEIGHT / 8)?;
-
         Ok(())
     }
 
@@ -331,8 +343,10 @@ where
         spi: &mut SPI,
         buffer: &[u8],
     ) -> Result<(), SPI::Error> {
-        self.update_frame(spi, buffer)?;
+        //        self.update_frame(spi, buffer)?;
         assert!((WIDTH * HEIGHT / 8) as usize == buffer.len());
+        self.set_ram_area(spi, 0, 0, WIDTH - 1, HEIGHT - 1)?;
+        self.set_ram_address_counters(spi, 0, 0)?;
 
         self.cmd_with_data(spi, Command::WRITE_RAM_RED, buffer)?;
         Ok(())