microbit: improve button implementation, add integrated example

Signed-off-by: deadprogram <ron@hybridgroup.com>

examples/microbit_buttons.go

@@ -15,11 +15,11 @@ func main() {
 
 	work := func() {
 		ubit.On(microbit.ButtonA, func(data interface{}) {
-			fmt.Println("button A")
+			fmt.Println("button A", data)
 		})
 
 		ubit.On(microbit.ButtonB, func(data interface{}) {
-			fmt.Println("button B")
+			fmt.Println("button B", data)
 		})
 	}
 

examples/microbit_buttons_leds.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"gobot.io/x/gobot"
+	"gobot.io/x/gobot/platforms/ble"
+	"gobot.io/x/gobot/platforms/microbit"
+)
+
+func main() {
+	bleAdaptor := ble.NewClientAdaptor(os.Args[1])
+	buttons := microbit.NewButtonDriver(bleAdaptor)
+	leds := microbit.NewLEDDriver(bleAdaptor)
+
+	work := func() {
+		buttons.On(microbit.ButtonA, func(data interface{}) {
+			fmt.Println("a", data)
+			if data.([]byte)[0] == 1 {
+				leds.UpLeftArrow()
+				return
+			}
+
+			leds.Blank()
+		})
+
+		buttons.On(microbit.ButtonB, func(data interface{}) {
+			fmt.Println("b", data)
+			if data.([]byte)[0] == 1 {
+				leds.UpRightArrow()
+				return
+			}
+
+			leds.Blank()
+		})
+	}
+
+	robot := gobot.NewRobot("buttonBot",
+		[]gobot.Connection{bleAdaptor},
+		[]gobot.Device{buttons, leds},
+		work,
+	)
+
+	robot.Start()
+}

platforms/microbit/button_driver.go

@@ -59,12 +59,12 @@ func (b *ButtonDriver) adaptor() *ble.ClientAdaptor {
 func (b *ButtonDriver) Start() (err error) {
 	// subscribe to button A notifications
 	b.adaptor().Subscribe(buttonACharacteristic, func(data []byte, e error) {
-		b.Publish(b.Event(ButtonA), nil)
+		b.Publish(b.Event(ButtonA), data)
 	})
 
 	// subscribe to button B notifications
 	b.adaptor().Subscribe(buttonBCharacteristic, func(data []byte, e error) {
-		b.Publish(b.Event(ButtonB), nil)
+		b.Publish(b.Event(ButtonB), data)
 	})
 
 	return