Golang Start Examples

Example #1

File: main.go Project: krasin/cflie

func main() {
	st, err := cflie.Start(usb.Hub)
	if err != nil {
		fail("Unable to start station: %v\n", err)
	}

	addr, err := st.Scan()
	if err != nil {
		fail("Scan: %v\n", err)
	}

	if len(addr) == 0 {
		fail("No Crazyflies found\n")
	}

	flieAddr := addr[0]
	flie, err := st.Open(flieAddr)
	if err != nil {
		fail("Unable to connect to [%s]: %v\n", flieAddr, err)
	}
	go countPackets(flie.RecvChan)

	flie.SendChan <- []byte{60, 0, 0, 0, 0, 0, 0, 0, 128, 250, 117, 61, 64, 48, 117}

	fmt.Printf("Press Ctrl+C to exit\n")
	for {
		time.Sleep(time.Second)
	}
}

Example #2

File: main.go Project: samofly/cflie

func Main() {
	st, err := cflie.Start(usb.Hub)
	if err != nil {
		log.Fatal(err)
	}
	addr, err := st.Scan()
	if err != nil {
		log.Fatalf("Scan failed: %v", err)
	}
	log.Printf("Found Crazyflies: %v", addr)
}

Example #3

File: main.go Project: samofly/cflie

func Main() {
	flags.Parse(flag.Args()[1:])

	if *output == "" {
		*output = fmt.Sprintf("incoming.run.%s", time.Now().UTC().Format(time.RFC3339))
	}

	f, err := os.OpenFile(*output, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0644)
	if err != nil {
		fail("Unable to open output: %v\n", err)
	}
	defer f.Close()

	st, err := cflie.Start(usb.Hub)
	if err != nil {
		fail("Unable to start station: %v\n", err)
	}

	addr, err := st.Scan()
	if err != nil {
		fail("Scan: %v\n", err)
	}

	if len(addr) == 0 {
		fail("No Crazyflies found\n")
	}

	fmt.Fprintf(os.Stderr, "Found Crazyflies: %+v\n", addr)

	flieAddr := addr[0]
	flie, err := st.Open(flieAddr)
	if err != nil {
		fail("Unable to connect to [%s]: %v\n", flieAddr, err)
	}

	for p := range flie.RecvChan {
		if len(p) == 0 {
			continue
		}
		for i, v := range p {
			if i > 0 {
				fmt.Fprint(f, " ")
			}
			fmt.Fprintf(f, "%3d", v)
		}
		fmt.Fprintln(f)
		if err = f.Sync(); err != nil {
			fail("Unable to flush output: %v\n", err)
		}
	}
}

Example #4

File: main.go Project: samofly/cflie

func Main() {
	st, err := cflie.Start(usb.Hub)
	if err != nil {
		fail("Unable to start station: %v\n", err)
	}

	addr, err := st.Scan()
	if err != nil {
		fail("Scan: %v\n", err)
	}

	if len(addr) == 0 {
		fail("No Crazyflies found\n")
	}

	flieAddr := addr[0]
	flie, err := st.Open(flieAddr)
	if err != nil {
		fail("Unable to connect to [%s]: %v\n", flieAddr, err)
	}

	for {

		buf := make([]byte, 1)

		// Currently, this awaits for enter to be pressed
		// To get rid of that, pty/tty must be used.
		// See the following packages:
		// https://github.com/dotcloud/docker/tree/master/term
		// https://github.com/kr/pty
		_, err := os.Stdin.Read(buf)
		if err != nil {
			fail("Could not read from stdin: %v\n", err)
		}
		switch buf[0] {
		case ' ':
			flie.SendChan <- cmd(0, 0, 0, 37000)
		default:
			flie.SendChan <- cmd(0, 0, 0, 30000)
		}
	}
}

Example #5

File: main.go Project: samofly/cflie

func Main() {
	st, err := cflie.Start(usb.Hub)
	if err != nil {
		fail("Unable to start station: %v\n", err)
	}

	addr, err := st.Scan()
	if err != nil {
		fail("Scan: %v\n", err)
	}

	if len(addr) == 0 {
		fail("No Crazyflies found\n")
	}

	flieAddr := addr[0]
	flie, err := st.Open(flieAddr)
	if err != nil {
		fail("Unable to connect to [%s]: %v\n", flieAddr, err)
	}
	flie.SendChan <- []byte{60, 0, 0, 0, 0, 0, 0, 0, 128, 250, 117, 61, 64, 48, 117}

	time.Sleep(500 * time.Millisecond)
}