Make a basic front-back color Halloween display

hello_gradient/src/bin/halloween2019.rs

@@ -0,0 +1,45 @@
+#![no_std]
+#![no_main]
+
+use core::iter::repeat;
+use lights::{
+    gamma::correct,
+    HardwareRgb,
+    PixelIterator,
+    rgb::{
+        Rgb
+    }
+};
+use lights_hal::{boot, delay, entry, OutputPin};
+
+#[entry]
+fn main() -> ! {
+    let mut lights = boot();
+    lights.red_led.set_high().unwrap();
+
+    let pattern =
+        repeat(&Rgb(255,0,128)).take(150)
+        .chain(
+            repeat(&Rgb(255,128,0)).take(150)
+        ).cycle();
+
+    let mut buffer = [HardwareRgb(255,255,0); 200];
+    let mut light = false;
+    loop {
+        // blink light to demonstrate loop is still running
+        if light {
+            lights.red_led.set_high().unwrap();
+        } else {
+            lights.red_led.set_low().unwrap();
+        }
+        light = !light;
+
+        for (i, pixel) in pattern.clone().take(200).enumerate() {
+            buffer[i] = correct(pixel);
+        }
+
+        buffer.iter().render_to(&mut lights);
+
+        delay(12_000_000);
+    }
+}