bring in the idea of a hardware abstraction layer

samples/gpiodetect.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"time"
+
+	"github.com/kidoman/embd"
+	"github.com/kidoman/embd/host"
+)
+
+func main() {
+	h, _, err := host.Detect()
+	if err != nil {
+		return
+	}
+
+	var pinNo interface{}
+
+	switch h {
+	case host.BBB:
+		pinNo = "P9_31"
+	case host.RPi:
+		pinNo = 10
+	default:
+		panic("host not supported (yet :P)")
+	}
+
+	gpio, err := embd.NewGPIO()
+	if err != nil {
+		panic(err)
+	}
+	defer gpio.Close()
+
+	led, err := gpio.DigitalPin(pinNo)
+	if err != nil {
+		panic(err)
+	}
+	defer led.Close()
+
+	if err := led.SetDir(embd.Out); err != nil {
+		panic(err)
+	}
+	if err := led.Write(embd.High); err != nil {
+		panic(err)
+	}
+
+	time.Sleep(1 * time.Second)
+
+	if err := led.SetDir(embd.In); err != nil {
+		panic(err)
+	}
+}