func setClock(t time.Time) error {
tv := syscall.NsecToTimeval(t.UnixNano())
if err := syscall.Settimeofday(&tv); err != nil {
return errors.New("settimeofday: " + err.Error())
}
return nil
}
func main() {
switch len(flag.Args()) {
case 0:
fmt.Printf("%v\n", date(z))
case 1:
argv0 := flag.Args()[0]
if argv0[0] == '+' {
fmt.Printf("%v\n", dateMap(argv0[1:]))
} else {
t, err := getTime(argv0)
if err != nil {
log.Fatalf("%v: %v", argv0, err)
}
tv := syscall.NsecToTimeval(t.UnixNano())
if err := syscall.Settimeofday(&tv); err != nil {
log.Fatalf("%v: %v", argv0, err)
}
}
default:
usage()
}
}
func main() {
flag.Parse()
if !*readTime && !*setTime && !*writeTime {
flag.Usage()
return
}
var err error
if i, err = bus.NewI2C(*addr, *dev); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
if *readTime {
if t := getDateDS1307(); t != nil {
fmt.Println(t)
}
}
if *setTime {
if t := getDateDS1307(); t != nil {
tv := syscall.Timeval{
Sec: int32(t.Unix()),
Usec: int32(t.UnixNano() % 100000000),
}
if err = syscall.Settimeofday(&tv); err != nil {
fmt.Fprintln(os.Stderr, err.Error())
}
}
}
if *writeTime {
now := time.Now()
fmt.Println("set time -", now)
setDateDS1307(&now)
time.Sleep(100 * time.Millisecond)
if t := getDateDS1307(); t != nil {
fmt.Println(t)
}
}
}