blink via golang on beablebone

blink.go

package main

import (
	"log"
	"os"
	"time"
)

func setLed(led string, value []byte) {
	file, err := os.OpenFile(led+"/brightness", os.O_WRONLY, 0666)
	if err != nil {
		log.Fatal(err)
	}
	file.Write(value)
	file.Close()
}

func blink(led string) {
	setLed(led, []byte("1"))
	time.Sleep(10 * time.Millisecond)
	setLed(led, []byte("0"))
}

func main() {
	d := 5
	t1 := time.NewTicker(time.Duration(d) * time.Second / 2)
	t2 := time.NewTicker(time.Duration(d) * time.Second / 3)
	t3 := time.NewTicker(time.Duration(d) * time.Second / 5)
	for {
		select {
		case <-t1.C:
			go blink("/sys/devices/platform/leds-gpio/leds/beaglebone::usr1")
		case <-t2.C:
			go blink("/sys/devices/platform/leds-gpio/leds/beaglebone::usr2")
		case <-t3.C:
			go blink("/sys/devices/platform/leds-gpio/leds/beaglebone::usr3")
		}
	}
}