Esempio n. 1
0
func main() {
	ctx := usb.NewContext()
	defer ctx.Close()

	config := usbscale.UsbConfig{
		Vendor:   0x0B67,
		Product:  0,
		Config:   1,
		Iface:    0,
		Setup:    0,
		Endpoint: 1,
	}

	scales, err := usbscale.GetScales(ctx, config)
	if err != nil {
		log.Fatal(err)
	}
	for _, scale := range scales {
		defer scale.Close()
	}
	scl := scales[0]

	ch := make(chan float32)
	go scl.CRead(ch)

	for {
		select {
		case weight := <-ch:
			log.Printf("%.2f lb", weight)
		}

	}
}
Esempio n. 2
0
func main() {
	flag.Parse()

	// Only one context should be needed for an application.  It should always be closed.
	ctx := usb.NewContext()
	defer ctx.Close()

	// Debugging can be turned on; this shows some of the inner workings of the libusb package.
	ctx.Debug(*debug)

	// ListDevices is used to find the devices to open.
	devs, err := ctx.ListDevices(func(desc *usb.Descriptor) bool {
		// The usbid package can be used to print out human readable information.
		fmt.Printf("%03d.%03d %s:%s %s\n", desc.Bus, desc.Address, desc.Vendor, desc.Product, usbid.Describe(desc))
		fmt.Printf("  Protocol: %s\n", usbid.Classify(desc))

		if desc.SerialNumber != "" {
			fmt.Printf("  Serial: %s\n", desc.SerialNumber)
		}

		// The configurations can be examined from the Descriptor, though they can only
		// be set once the device is opened.  All configuration references must be closed,
		// to free up the memory in libusb.
		for _, cfg := range desc.Configs {
			// This loop just uses more of the built-in and usbid pretty printing to list
			// the USB devices.
			fmt.Printf("  %s:\n", cfg)
			for _, alt := range cfg.Interfaces {
				fmt.Printf("    --------------\n")
				for _, iface := range alt.Setups {
					fmt.Printf("    %s\n", iface)
					fmt.Printf("      %s\n", usbid.Classify(iface))
					for _, end := range iface.Endpoints {
						fmt.Printf("      %s\n", end)
					}
				}
			}
			fmt.Printf("    --------------\n")
		}

		// After inspecting the descriptor, return true or false depending on whether
		// the device is "interesting" or not.  Any descriptor for which true is returned
		// opens a Device which is retuned in a slice (and must be subsequently closed).
		return false
	})

	// All Devices returned from ListDevices must be closed.
	defer func() {
		for _, d := range devs {
			d.Close()
		}
	}()

	// ListDevices can occaionally fail, so be sure to check its return value.
	if err != nil {
		log.Fatalf("list: %s", err)
	}

	for _, dev := range devs {
		// Once the device has been selected from ListDevices, it is opened
		// and can be interacted with.
		_ = dev
	}
}
Esempio n. 3
0
func main() {
	flag.Parse()

	// Only one context should be needed for an application.  It should always be closed.
	ctx := usb.NewContext()
	defer ctx.Close()

	ctx.Debug(*debug)

	log.Printf("Scanning for device %q...", *device)

	// ListDevices is used to find the devices to open.
	devs, err := ctx.ListDevices(func(desc *usb.Descriptor) bool {
		if fmt.Sprintf("%s:%s", desc.Vendor, desc.Product) != *device {
			return false
		}

		// The usbid package can be used to print out human readable information.
		fmt.Printf("  Protocol: %s\n", usbid.Classify(desc))

		// The configurations can be examined from the Descriptor, though they can only
		// be set once the device is opened.  All configuration references must be closed,
		// to free up the memory in libusb.
		for _, cfg := range desc.Configs {
			// This loop just uses more of the built-in and usbid pretty printing to list
			// the USB devices.
			fmt.Printf("  %s:\n", cfg)
			for _, alt := range cfg.Interfaces {
				fmt.Printf("    --------------\n")
				for _, iface := range alt.Setups {
					fmt.Printf("    %s\n", iface)
					fmt.Printf("      %s\n", usbid.Classify(iface))
					for _, end := range iface.Endpoints {
						fmt.Printf("      %s\n", end)
					}
				}
			}
			fmt.Printf("    --------------\n")
		}

		return true
	})

	// All Devices returned from ListDevices must be closed.
	defer func() {
		for _, d := range devs {
			d.Close()
		}
	}()

	// ListDevices can occaionally fail, so be sure to check its return value.
	if err != nil {
		log.Fatalf("list: %s", err)
	}

	if len(devs) == 0 {
		log.Fatalf("no devices found")
	}

	dev := devs[0]

	log.Printf("Connecting to endpoint...")
	log.Printf("- %#v", dev.Descriptor)
	ep, err := dev.OpenEndpoint(uint8(*config), uint8(*iface), uint8(*setup), uint8(*endpoint)|uint8(usb.ENDPOINT_DIR_IN))
	if err != nil {
		log.Fatalf("open: %s", err)
	}
	_ = ep
}