Initial groundwork of animatrix

aura/src/animatrix_dbus.rs

@@ -0,0 +1,55 @@
+use super::*;
+use dbus::channel::Sender;
+use dbus::{blocking::Connection, Message};
+use std::error::Error;
+use std::sync::{
+    atomic::{AtomicBool, Ordering},
+    Arc,
+};
+use std::{thread, time::Duration};
+
+/// Simplified way to write a effect block
+pub struct AnimatrixDbusWriter {
+    connection: Box<Connection>,
+    block_time: u64,
+    stop: Arc<AtomicBool>,
+}
+
+impl AnimatrixDbusWriter {
+    #[inline]
+    pub fn new() -> Result<Self, Box<dyn Error>> {
+        let connection = Connection::new_system()?;
+        Ok(AnimatrixDbusWriter {
+            connection: Box::new(connection),
+            block_time: 100,
+            stop: Arc::new(AtomicBool::new(false)),
+        })
+    }
+
+    /// Write an Animatrix image
+    ///
+    /// The expected input here is *two* Vectors, 640 bytes in length. The two vectors
+    /// are each one half of the full image write.
+    ///
+    /// After each write a flush is written, it is assumed that this tells the device to
+    /// go ahead and display the written bytes
+    ///
+    /// # Note:
+    /// The vectors are expected to contain the full sequence of bytes as follows
+    ///
+    /// - Write pane 1: 0x5e 0xc0 0x02 0x01 0x00 0x73 0x02 .. <led brightness>
+    /// - Write pane 2: 0x5e 0xc0 0x02 0x74 0x02 0x73 0x02 .. <led brightness>
+    ///
+    /// Where led brightness is 0..255, low to high
+    #[inline]
+    pub fn write_image(&mut self, image: &[Vec<u8>; 2]) -> Result<(), Box<dyn Error>> {
+        let msg = Message::new_method_call(DBUS_NAME, DBUS_PATH, DBUS_IFACE, "AnimatrixWrite")?
+            .append2(image[0].to_vec(), image[1].to_vec());
+        self.connection.send(msg).unwrap();
+        thread::sleep(Duration::from_millis(self.block_time));
+        if self.stop.load(Ordering::Relaxed) {
+            panic!("Got signal to stop!");
+        }
+        Ok(())
+    }
+}