diff --git a/src/device/mod.rs b/src/device.rs
similarity index 98%
rename from src/device/mod.rs
rename to src/device.rs
index 70a3916..e231299 100644
--- a/src/device/mod.rs
+++ b/src/device.rs
@@ -29,7 +29,7 @@ pub struct Status {
 pub trait Device {
     fn status( &self ) -> Status;
     fn draw(
-	    &self,
+	    &mut self,
 	    frame: Vec<Point>,
     	speed: u32,
     ) -> LJResult<()> ;
diff --git a/src/device/helios.rs b/src/device/helios.rs
index a090209..518a45a 100644
--- a/src/device/helios.rs
+++ b/src/device/helios.rs
@@ -30,7 +30,8 @@ impl HeliosDevice {
 		};
 		let dac = device.open()?;
 		Ok(Self {
-			conf: (*conf).clone(),			dac,
+			conf: (*conf).clone(),
+			dac,
 		})
 	}
 }
@@ -44,7 +45,7 @@ impl Device for HeliosDevice {
 		};
 	}
 
-	fn draw(&self,
+	fn draw(&mut self,
 	        line: Vec<Point>,
 	        speed: u32,
 	) -> LJResult<()> {
@@ -52,6 +53,11 @@ impl Device for HeliosDevice {
 
 		let points: Vec<helios_dac::Point> = line.into_iter().map(|p| p.into()).collect();
 		let frame = Frame::new(speed, points);
+
+		while let Ok(DeviceStatus::NotReady) = self.dac.status() {
+	        self.dac.write_frame(frame.clone())?;
+	    }
+
 		Ok(())
 	}