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)
}
}
}
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
}
}
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
}