support for MCP4725 DAC

samples/mcp4725.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"log"
+	"math/rand"
+	"os"
+	"os/signal"
+
+	"github.com/kid0m4n/go-rpi/controller/mcp4725"
+	"github.com/kid0m4n/go-rpi/i2c"
+)
+
+func main() {
+	bus, err := i2c.NewBus(1)
+	if err != nil {
+		log.Panic(err)
+	}
+
+	dac := mcp4725.New(bus, 0x62)
+	defer dac.Close()
+
+	stop := make(chan os.Signal, 1)
+	signal.Notify(stop, os.Interrupt, os.Kill)
+
+	for {
+		select {
+		case <-stop:
+			return
+		default:
+			voltage := rand.Intn(4096)
+			if err := dac.SetVoltage(voltage); err != nil {
+				log.Printf("mcp4725: %v", err)
+			}
+		}
+	}
+}