Removed data_x_times function

src/epd1in54/mod.rs

@@ -178,8 +178,11 @@ where
         // clear the ram with the background color
         let color = self.background_color.get_byte_value();
 
-        self.interface.cmd(Command::WRITE_RAM)?;
-        self.interface.data_x_times(color, WIDTH / 8 * HEIGHT)
+        //TODO: this is using a big buffer atm, is it better to just loop over sending a single byte?
+        self.interface.cmd_with_data(
+            Command::WRITE_RAM,
+            &[color; WIDTH as usize / 8 * HEIGHT as usize]
+        )
     }
 
 

src/epd2in9/mod.rs

@@ -175,8 +175,11 @@ where
         // clear the ram with the background color
         let color = self.background_color.get_byte_value();
 
-        self.interface.cmd(Command::WRITE_RAM)?;
-        self.interface.data_x_times(color, WIDTH / 8 * HEIGHT)
+        //TODO: this is using a big buffer atm, is it better to just loop over sending a single byte?
+        self.interface.cmd_with_data(
+            Command::WRITE_RAM,
+            &[color; WIDTH as usize / 8 * HEIGHT as usize]
+        )
     }
 
     /// Sets the backgroundcolor for various commands like [WaveshareInterface::clear_frame()](clear_frame())

src/epd4in2/mod.rs

@@ -191,7 +191,9 @@ where
 
 
         self.command(Command::DATA_START_TRANSMISSION_1)?;
-        self.interface.data_x_times(color_value, buffer.len() as u16)?;
+        for _ in 0..buffer.len() {
+            self.send_data(&[color_value])?;
+        }
 
         //TODO: Removal of delay. TEST!
         //self.delay_ms(2);
@@ -254,17 +256,23 @@ where
     fn clear_frame(&mut self) -> Result<(), ERR> {
         self.send_resolution()?;
 
-        let size = WIDTH / 8 * HEIGHT;
+        //let size = WIDTH as usize / 8 * HEIGHT as usize;
         let color_value = self.color.get_byte_value();
 
-        self.command(Command::DATA_START_TRANSMISSION_1)?;
-        self.interface.data_x_times(color_value, size)?;
+        //TODO: this is using a big buffer atm, is it better to just loop over sending a single byte?
+        self.interface.cmd_with_data(
+            Command::DATA_START_TRANSMISSION_1,
+            &[color_value; WIDTH as usize / 8 * HEIGHT as usize]
+        )?;
 
         //TODO: Removal of delay. TEST!
         //self.delay_ms(2);
 
-        self.command(Command::DATA_START_TRANSMISSION_2)?;
-        self.interface.data_x_times(color_value, size)
+        //TODO: this is using a big buffer atm, is it better to just loop over sending a single byte?
+        self.interface.cmd_with_data(
+            Command::DATA_START_TRANSMISSION_2,
+            &[color_value; WIDTH as usize / 8 * HEIGHT as usize]
+        )
     }
 
     /// Sets the backgroundcolor for various commands like [WaveshareInterface::clear_frame()](clear_frame())

src/traits/connection_interface.rs

@@ -73,30 +73,6 @@ where
        self.data(data)
     }
 
-    /// Basic function for sending the same byte of data (one u8) multiple times over spi
-    ///
-    /// Enables direct interaction with the device with the help of [command()](ConnectionInterface::command())
-    /// 
-    /// //TODO: make public?
-    pub(crate) fn data_x_times(
-        &mut self,
-        val: u8,
-        repetitions: u16,
-    ) -> Result<(), ERR> {
-        // high for data
-        self.dc.set_high();
-
-        // Transfer data (u8) over spi
-        self.with_cs(|epd| {
-            for _ in 0..repetitions {
-                epd.spi.write(&[val])?;
-            }
-            Ok(())
-        })
-    }
-
-
-
     // spi write helper/abstraction function
     fn with_cs<F>(&mut self, f: F) -> Result<(), ERR>
     where