Driver for BBC micro:bit on-board LED matrix (#48)

examples/microbitmatrix/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"image/color"
+	"math/rand"
+	"time"
+
+	"github.com/tinygo-org/drivers/microbitmatrix"
+)
+
+var display microbitmatrix.Device
+
+func main() {
+	display = microbitmatrix.New()
+	display.Configure(microbitmatrix.Config{})
+
+	display.ClearDisplay()
+
+	x := int16(1)
+	y := int16(2)
+	deltaX := int16(1)
+	deltaY := int16(1)
+	then := time.Now()
+	c := color.RGBA{255, 255, 255, 255}
+
+	for {
+		if time.Since(then).Nanoseconds() > 80000000 {
+			then = time.Now()
+
+			pixel := display.GetPixel(x, y)
+			if pixel {
+				display.ClearDisplay()
+				x = 1 + int16(rand.Int31n(3))
+				y = 1 + int16(rand.Int31n(3))
+				deltaX = 1
+				deltaY = 1
+				if rand.Int31n(2) == 0 {
+					deltaX = -1
+				}
+				if rand.Int31n(2) == 0 {
+					deltaY = -1
+				}
+			}
+			display.SetPixel(x, y, c)
+
+			x += deltaX
+			y += deltaY
+
+			if x == 0 || x == 4 {
+				deltaX = -deltaX
+			}
+
+			if y == 0 || y == 4 {
+				deltaY = -deltaY
+			}
+		}
+		display.Display()
+	}
+}