adafruit4650: support for Adafruite 4650 feather OLED

examples/adafruit4650/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"image/color"
+	"machine"
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/adafruit4650"
+	"tinygo.org/x/tinyfont"
+	"tinygo.org/x/tinyfont/freemono"
+)
+
+func main() {
+	machine.I2C0.Configure(machine.I2CConfig{})
+
+	dev := adafruit4650.New(machine.I2C0)
+
+	err := dev.Configure()
+	if err != nil {
+		panic(err)
+	}
+
+	drawPlus(&dev)
+	drawHelloWorld(&dev)
+
+	err = dev.Display()
+	if err != nil {
+		panic(err)
+	}
+}
+
+func drawPlus(d drivers.Displayer) {
+	for i := int16(0); i < 128; i++ {
+		d.SetPixel(i, 32, color.RGBA{R: 1})
+	}
+	for i := int16(0); i < 64; i++ {
+		d.SetPixel(64, i, color.RGBA{R: 1})
+	}
+}
+
+func drawHelloWorld(d drivers.Displayer) {
+	tinyfont.WriteLine(d, &freemono.Regular9pt7b, 0, 32, "Hello World!", color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff})
+}