led: support led functionality on the bbb

samples/.gitignore

@@ -8,6 +8,8 @@ gpiodetect
 gpiodirect
 gpioshort
 l3gd20
+led
+ledshort
 lsm303
 mcp4725
 pca9685

samples/led.go

@@ -0,0 +1,44 @@
+// +build ignore
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"time"
+
+	"github.com/kidoman/embd"
+)
+
+func main() {
+	if err := embd.InitLED(); err != nil {
+		panic(err)
+	}
+	defer embd.CloseLED()
+
+	led, err := embd.NewLED(3)
+	if err != nil {
+		panic(err)
+	}
+	defer func() {
+		led.Off()
+		led.Close()
+	}()
+
+	quit := make(chan os.Signal, 1)
+	signal.Notify(quit, os.Interrupt, os.Kill)
+	defer signal.Stop(quit)
+
+	for {
+		select {
+		case <-time.After(500 * time.Millisecond):
+			if err := led.Toggle(); err != nil {
+				panic(err)
+			}
+			fmt.Printf("Toggled\n")
+		case <-quit:
+			return
+		}
+	}
+}

samples/ledshort.go

@@ -0,0 +1,18 @@
+// +build ignore
+
+package main
+
+import (
+	"time"
+
+	"github.com/kidoman/embd"
+)
+
+func main() {
+	embd.InitLED()
+	defer embd.CloseLED()
+
+	embd.LEDOn(3)
+	time.Sleep(1 * time.Second)
+	embd.LEDOff(3)
+}