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))
// 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 InitUSB() {
var err error
flag.Parse()
// Only one context should be needed for an application. It should always be closed.
ctx = usb.NewContext()
ctx.Debug(*debug)
log.Printf("Scanning for device %q...", *device)
dev, _ := ctx.GetDeviceWithVidPid(*device)
// Open up two ep for read and write
ep_bulk_read, err = dev.OpenEndpoint(
uint8(*config),
uint8(*iface),
uint8(*setup),
uint8(*endpoint_bulk_read)|uint8(usb.ENDPOINT_DIR_IN))
ep_bulk_write, err = dev.OpenEndpoint(
uint8(*config),
uint8(*iface),
uint8(*setup),
uint8(*endpoint_bulk_write)|uint8(usb.ENDPOINT_DIR_OUT))
if err != nil {
log.Fatalf("open: %s", err)
}
log.Printf("Init Done\n")
}
func Do(arm byte, base byte, led byte) (int, error) {
command := []byte{arm, base, led}
context := usb.NewContext()
defer context.Close()
var robotDesc *usb.Descriptor
devs, err := context.ListDevices(func(desc *usb.Descriptor) bool {
if desc.Vendor == 0x1267 {
robotDesc = desc
return true
}
return false
})
defer func() {
for _, d := range devs {
d.Close()
}
}()
if robotDesc == nil {
fmt.Println("Could not find Maplin Robot Arm")
var reterr error
return 0, reterr
}
if err != nil {
fmt.Println("Some devices had an error: %s", err)
var reterr error
return 0, reterr
}
devs[0].Control(0x40, 6, 0x100, 0, command)
time.Sleep(150 * time.Millisecond)
return devs[0].Control(0x40, 6, 0x100, 0, []byte{0, 0, led})
}
func (s *Display) OpenDevice() error {
devices, err := usb.NewContext().ListDevices(func(desc *usb.Descriptor) bool {
return desc.Vendor == usb.ID(vendorID) && desc.Device == usb.BCD(deviceID)
})
if err != nil {
return err
}
if len(devices) == 0 {
return fmt.Errorf("no lcd detected")
}
s.device = devices[0]
return nil
}
func flash(buf []byte) {
ctx := usb.NewContext()
defer ctx.Close()
ctx.Debug(usbDebug)
devices, err := ctx.ListDevices(func(desc *usb.Descriptor) bool {
return desc.Vendor == VENDOR_ID && desc.Product == PRODUCT_ID
})
if err != nil {
log.Fatal(err)
}
for _, d := range devices {
fmt.Printf("Found device %s:%s\n", d.Descriptor.Vendor, d.Descriptor.Product)
defer d.Close()
}
if len(devices) == 0 {
log.Println("Could not find device")
return
}
d := devices[0]
d.WriteTimeout = 3 * time.Second
//Config 1, Interface 0, setup 0, Endpoint 2 as deduced from lsusb
e, err := d.OpenEndpoint(1, 0, 0, 2)
if err != nil {
log.Fatal(err)
}
maxSize := int(e.Info().MaxPacketSize)
for i := 0; i < len(buf); {
top := i + maxSize
if top > len(buf) {
top = len(buf)
}
s, err := e.Write(buf[i:top])
if err != nil {
log.Printf("Written %d of %d bytes\n", i+s, len(buf))
log.Fatal(err)
}
i += s
}
}
func temperature() (float64, error) {
ctx := usb.NewContext()
defer ctx.Close()
devs, err := ctx.ListDevices(func(desc *usb.Descriptor) bool {
return desc.Vendor == 0x0c45 && desc.Product == 0x7401
})
defer func() {
for _, d := range devs {
d.Close()
}
}()
if err != nil {
return 0.0, err
}
if len(devs) == 0 {
return 0.0, fmt.Errorf("No thermometers found.")
}
dev := devs[0]
if err = dev.SetConfig(1); err != nil {
return 0.0, err
}
ep, err := dev.OpenEndpoint(1, 1, 0, 0x82)
if err != nil {
return 0.0, err
}
if _, err = dev.Control(0x21, 0x09, 0x0200, 0x01, []byte{0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00}); err != nil {
return 0.0, err
}
buf := make([]byte, 8)
if _, err = ep.Read(buf); err != nil {
return 0.0, err
}
return float64(buf[4]) + float64(buf[5])/256, nil
}
// Open an LCDSysInfo device at index. If you have one device connected,
// then choose index 0. If you have more than one device connected, you will
// have to play around with index until you get the device you want.
func (l *LCDSysInfo) Open(index int) error {
l.ctx = usb.NewContext()
l.ctx.Debug(0)
// Find our LCDSysInfo device.
devs, err := l.ctx.ListDevices(func(desc *usb.Descriptor) bool {
if desc.Vendor == VENDOR_ID && desc.Product == PRODUCT_ID {
return true
}
return false
})
// I don't test for an error because I've noticed it returns a
// device and throws a NOT_FOUND error. Ok?...
if len(devs) == 0 {
return fmt.Errorf("Could not find LCDSysInfo device: %v", err)
}
// Pick the nth index of the device. If we only have one device
// connected, this will always be 0.
if len(devs) > index {
l.dev = devs[index]
}
// gousb will open all the devices it returns. So we must close
// devices we are not using.
for i, v := range devs {
if i == index {
continue
}
v.Close()
}
return nil
}
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
}
func init() {
ctx = usb.NewContext()
}
func main() {
ctx := usb.NewContext()
defer ctx.Close()
//ctx.Debug(10)
type modelInfo struct {
config, iface, setup, endIn, endOut uint8
}
var model modelInfo
devs, err := ctx.ListDevices(func(desc *usb.Descriptor) bool {
switch {
case desc.Vendor == 0x045e && desc.Product == 0x028e:
log.Printf("Found standard Microsoft controller")
/*
250.006 045e:028e Xbox360 Controller (Microsoft Corp.)
Protocol: Vendor Specific Class (Vendor Specific Subclass) Vendor Specific Protocol
Config 01:
--------------
Interface 00 Setup 00
Vendor Specific Class
Endpoint 1 IN interrupt - unsynchronized data [32 0]
Endpoint 1 OUT interrupt - unsynchronized data [32 0]
--------------
Interface 01 Setup 00
Vendor Specific Class
Endpoint 2 IN interrupt - unsynchronized data [32 0]
Endpoint 2 OUT interrupt - unsynchronized data [32 0]
Endpoint 3 IN interrupt - unsynchronized data [32 0]
Endpoint 3 OUT interrupt - unsynchronized data [32 0]
--------------
Interface 02 Setup 00
Vendor Specific Class
Endpoint 0 IN interrupt - unsynchronized data [32 0]
--------------
Interface 03 Setup 00
Vendor Specific Class
--------------
*/
model = modelInfo{1, 0, 0, 1, 1}
case desc.Vendor == 0x1689 && desc.Product == 0xfd00:
log.Printf("Found Razer Onza Tournament controller")
/*
250.006 1689:fd00 Unknown 1689:fd00
Protocol: Vendor Specific Class (Vendor Specific Subclass) Vendor Specific Protocol
Config 01:
--------------
Interface 00 Setup 00
Vendor Specific Class
Endpoint 1 IN interrupt - unsynchronized data [32 0]
Endpoint 2 OUT interrupt - unsynchronized data [32 0]
--------------
Interface 01 Setup 00
Vendor Specific Class
Endpoint 3 IN interrupt - unsynchronized data [32 0]
Endpoint 0 OUT interrupt - unsynchronized data [32 0]
Endpoint 1 IN interrupt - unsynchronized data [32 0]
Endpoint 1 OUT interrupt - unsynchronized data [32 0]
--------------
Interface 02 Setup 00
Vendor Specific Class
Endpoint 2 IN interrupt - unsynchronized data [32 0]
--------------
Interface 03 Setup 00
Vendor Specific Class
--------------
*/
model = modelInfo{1, 0, 0, 1, 2}
default:
return false
}
return true
})
if err != nil {
log.Fatalf("listdevices: %s", err)
}
defer func() {
for _, d := range devs {
d.Close()
}
}()
if len(devs) != 1 {
log.Fatalf("found %d devices, want 1", len(devs))
}
controller := devs[0]
if err := controller.Reset(); err != nil {
log.Fatalf("reset: %s", err)
}
in, err := controller.OpenEndpoint(
model.config,
model.iface,
model.setup,
model.endIn|uint8(usb.ENDPOINT_DIR_IN))
if err != nil {
log.Fatalf("in: openendpoint: %s", err)
}
out, err := controller.OpenEndpoint(
model.config,
model.iface,
model.setup,
model.endOut|uint8(usb.ENDPOINT_DIR_OUT))
if err != nil {
log.Fatalf("out: openendpoint: %s", err)
}
// https://github.com/Grumbel/xboxdrv/blob/master/PROTOCOL
var b [32]byte
for {
n, err := in.Read(b[:])
log.Printf("read %d bytes: % x [err: %v]", n, b[:n], err)
if err != nil {
break
}
}
const (
Empty byte = iota // 00000000 ( 0) no LEDs
WarnAll // 00000001 ( 1) flash all briefly
NewPlayer1 // 00000010 ( 2) p1 flash then solid
NewPlayer2 // 00000011
NewPlayer3 // 00000100
NewPlayer4 // 00000101
Player1 // 00000110 ( 6) p1 solid
Player2 // 00000111
Player3 // 00001000
Player4 // 00001001
Waiting // 00001010 (10) empty w/ loops
WarnPlayer // 00001011 (11) flash active
_ // 00001100 (12) empty
Battery // 00001101 (13) squiggle
Searching // 00001110 (14) slow flash
Booting // 00001111 (15) solid then flash
)
led := func(b byte) {
out.Write([]byte{0x01, 0x03, b})
}
setPlayer := func(player byte) {
spin := []byte{
Player1, Player2, Player4, Player3,
}
spinIdx := 0
spinDelay := 100 * time.Millisecond
led(Booting)
time.Sleep(100 * time.Millisecond)
for spinDelay > 20*time.Millisecond {
led(spin[spinIdx])
time.Sleep(spinDelay)
spinIdx = (spinIdx + 1) % len(spin)
spinDelay -= 5 * time.Millisecond
}
for i := 0; i < 40; i++ { // just for safety
cur := spin[spinIdx]
led(cur)
time.Sleep(spinDelay)
spinIdx = (spinIdx + 1) % len(spin)
if cur == player {
break
}
}
}
led(Empty)
time.Sleep(1 * time.Second)
setPlayer(Player1)
/*
time.Sleep(1 * time.Second)
setPlayer(Player2)
time.Sleep(1 * time.Second)
setPlayer(Player3)
time.Sleep(1 * time.Second)
setPlayer(Player4)
time.Sleep(5 * time.Second)
led(Waiting)
*/
var last, cur [32]byte
decode := func() {
n, err := in.Read(cur[:])
if err != nil || n != 20 {
log.Printf("ignoring read: %d bytes, err = %v", n, err)
return
}
// 1-bit values
for _, v := range []struct {
idx int
bit uint
name string
}{
{2, 0, "DPAD U"},
{2, 1, "DPAD D"},
{2, 2, "DPAD L"},
{2, 3, "DPAD R"},
{2, 4, "START"},
{2, 5, "BACK"},
{2, 6, "THUMB L"},
{2, 7, "THUMB R"},
{3, 0, "LB"},
{3, 1, "RB"},
{3, 2, "GUIDE"},
{3, 4, "A"},
{3, 5, "B"},
{3, 6, "X"},
{3, 7, "Y"},
} {
c := cur[v.idx] & (1 << v.bit)
l := last[v.idx] & (1 << v.bit)
if c == l {
continue
}
switch {
case c != 0:
log.Printf("Button %q pressed", v.name)
case l != 0:
log.Printf("Button %q released", v.name)
}
}
// 8-bit values
for _, v := range []struct {
idx int
name string
}{
{4, "LT"},
{5, "RT"},
} {
c := cur[v.idx]
l := last[v.idx]
if c == l {
continue
}
log.Printf("Trigger %q = %v", v.name, c)
}
dword := func(hi, lo byte) int16 {
return int16(hi)<<8 | int16(lo)
}
// +y
// N
// -x W-|-E +x
// S
// -y
dirs := [...]string{
"W", "SW", "S", "SE", "E", "NE", "N", "NW", "W",
}
dir := func(x, y int16) (string, int32) {
// Direction
rad := math.Atan2(float64(y), float64(x))
dir := 4 * rad / math.Pi
card := int(dir + math.Copysign(0.5, dir))
// Magnitude
mag := math.Sqrt(float64(x)*float64(x) + float64(y)*float64(y))
return dirs[card+4], int32(mag)
}
// 16-bit values
for _, v := range []struct {
hiX, loX int
hiY, loY int
name string
}{
{7, 6, 9, 8, "LS"},
{11, 10, 13, 12, "RS"},
} {
c, cmag := dir(
dword(cur[v.hiX], cur[v.loX]),
dword(cur[v.hiY], cur[v.loY]),
)
l, lmag := dir(
dword(last[v.hiX], last[v.loX]),
dword(last[v.hiY], last[v.loY]),
)
ccenter := cmag < 10240
lcenter := lmag < 10240
if ccenter && lcenter {
continue
}
if c == l && cmag == lmag {
continue
}
if cmag > 10240 {
log.Printf("Stick %q = %v x %v", v.name, c, cmag)
} else {
log.Printf("Stick %q centered", v.name)
}
}
last, cur = cur, last
}
controller.ReadTimeout = 60 * time.Second
for {
decode()
}
}
func main() {
flag.Parse()
ctx := usb.NewContext()
defer ctx.Close()
if *debug != 0 {
ctx.Debug(*debug)
}
var model modelInfo
devs, err := ctx.ListDevices(func(desc *usb.Descriptor) bool {
switch {
case desc.Vendor == 0x045e && desc.Product == 0x028e:
log.Printf("Found standard Microsoft controller")
/*
250.006 045e:028e Xbox360 Controller (Microsoft Corp.)
Protocol: Vendor Specific Class (Vendor Specific Subclass) Vendor Specific Protocol
Config 01:
--------------
Interface 00 Setup 00
Vendor Specific Class
Endpoint 1 IN interrupt - unsynchronized data [32 0]
Endpoint 1 OUT interrupt - unsynchronized data [32 0]
--------------
Interface 01 Setup 00
Vendor Specific Class
Endpoint 2 IN interrupt - unsynchronized data [32 0]
Endpoint 2 OUT interrupt - unsynchronized data [32 0]
Endpoint 3 IN interrupt - unsynchronized data [32 0]
Endpoint 3 OUT interrupt - unsynchronized data [32 0]
--------------
Interface 02 Setup 00
Vendor Specific Class
Endpoint 0 IN interrupt - unsynchronized data [32 0]
--------------
Interface 03 Setup 00
Vendor Specific Class
--------------
*/
model = modelInfo{1, 0, 0, 1, 1, "360"}
case desc.Vendor == 0x045e && desc.Product == 0x02d1:
log.Printf("Found Microsoft Xbox One controller")
/*
250.006 045e:02d1 Unknown (Microsoft Corp.)
Protocol: Vendor Specific Class
Config 01:
--------------
Interface 00 Setup 00
Vendor Specific Class
Endpoint 1 OUT interrupt - unsynchronized data [64 0]
Endpoint 1 IN interrupt - unsynchronized data [64 0]
--------------
Interface 01 Setup 00
Vendor Specific Class
Interface 01 Setup 01
Vendor Specific Class
Endpoint 2 OUT isochronous - unsynchronized data [228 0]
Endpoint 2 IN isochronous - unsynchronized data [228 0]
--------------
Interface 02 Setup 00
Vendor Specific Class
Interface 02 Setup 01
Vendor Specific Class
Endpoint 3 OUT bulk - unsynchronized data [64 0]
Endpoint 3 IN bulk - unsynchronized data [64 0]
--------------
*/
model = modelInfo{1, 0, 0, 1, 1, "one"}
case desc.Vendor == 0x1689 && desc.Product == 0xfd00:
log.Printf("Found Razer Onza Tournament controller")
/*
250.006 1689:fd00 Unknown 1689:fd00
Protocol: Vendor Specific Class (Vendor Specific Subclass) Vendor Specific Protocol
Config 01:
--------------
Interface 00 Setup 00
Vendor Specific Class
Endpoint 1 IN interrupt - unsynchronized data [32 0]
Endpoint 2 OUT interrupt - unsynchronized data [32 0]
--------------
Interface 01 Setup 00
Vendor Specific Class
Endpoint 3 IN interrupt - unsynchronized data [32 0]
Endpoint 0 OUT interrupt - unsynchronized data [32 0]
Endpoint 1 IN interrupt - unsynchronized data [32 0]
Endpoint 1 OUT interrupt - unsynchronized data [32 0]
--------------
Interface 02 Setup 00
Vendor Specific Class
Endpoint 2 IN interrupt - unsynchronized data [32 0]
--------------
Interface 03 Setup 00
Vendor Specific Class
--------------
*/
model = modelInfo{1, 0, 0, 1, 2, "360"}
default:
return false
}
return true
})
if err != nil {
log.Fatalf("listdevices: %s", err)
}
defer func() {
for _, d := range devs {
d.Close()
}
}()
if len(devs) != 1 {
log.Fatalf("found %d devices, want 1", len(devs))
}
controller := devs[0]
if err := controller.Reset(); err != nil {
log.Fatalf("reset: %s", err)
}
in, err := controller.OpenEndpoint(
model.config,
model.iface,
model.setup,
model.endIn|uint8(usb.ENDPOINT_DIR_IN))
if err != nil {
log.Fatalf("in: openendpoint: %s", err)
}
out, err := controller.OpenEndpoint(
model.config,
model.iface,
model.setup,
model.endOut|uint8(usb.ENDPOINT_DIR_OUT))
if err != nil {
log.Fatalf("out: openendpoint: %s", err)
}
switch {
case *readonly:
var b [512]byte
for {
n, err := in.Read(b[:])
log.Printf("read %d bytes: % x [err: %v]", n, b[:n], err)
if err != nil {
break
}
}
case model.kind == "360":
XBox360(controller, in, out)
case model.kind == "one":
XBoxOne(controller, in, out)
}
}
func New() (_k *Kinect, _e error) {
ctx := usb.NewContext()
defer func() {
// Be sure to close the context if we return an error
if _e != nil {
ctx.Close()
}
}()
dev, err := ctx.ListDevices(func(desc *usb.Descriptor) bool {
if desc.Vendor != 0x045e { // Microsoft Corp.
return false
}
switch desc.Product {
case 0x02ae, 0x02ad, 0x02b0:
return true
}
return false
})
if err != nil {
return nil, err
}
k := &Kinect{
ctx: ctx,
}
for _, d := range dev {
switch d.Product {
case 0x02ae: // XBOX NUI Camera
k.cam = d
case 0x02ad: // XBOX NUI Audio
k.mic = d
case 0x02b0: // XBOX NUI Motor
k.mot = d
default:
d.Close()
}
}
switch {
case k.cam == nil:
return nil, fmt.Errorf("kinect: failed to detect camera")
case k.mic == nil:
return nil, fmt.Errorf("kinect: failed to detect mic")
case k.mot == nil:
return nil, fmt.Errorf("kinect: failed to detect motor")
}
// Perform initialization
resp := []byte{0xFF}
if _, err := k.mot.Control(0xC0, 0x10, 0, 0, resp); err != nil {
return nil, fmt.Errorf("kinect: motor init: %s", err)
} else if resp[0] != 0x22 {
return nil, fmt.Errorf("kinect: motor init failed (code %#x)", resp[0])
}
//if err := k.SetAngle(+20); err != nil { return nil, err }
//if err := k.SetAngle(-20); err != nil { return nil, err }
if err := k.SetAngle(0); err != nil {
return nil, err
}
fmt.Println("Kinect: ", k.cam.Configs)
if k.depth, err = k.cam.OpenEndpoint(1, 0, 0, 0x82); err != nil {
return nil, fmt.Errorf("kinect: open depth: %s", err)
}
k.stop = make(chan struct{}, 1)
k.depthDone = make(chan struct{}, 1)
k.depthFrame = make(chan bool, 1000)
go k.streamDepth()
if err := k.initDepth(); err != nil {
return nil, fmt.Errorf("kinect: init depth: %s", err)
}
go func() {
for {
select {
case <-time.After(1 * time.Hour):
case <-k.stop:
return
}
}
}()
return k, nil
}
SET_CONT_CARRIER Request = 0x20
CHANNEL_SCANN Request = 0x21
LAUNCH_BOOTLOADER Request = 0xFF
RADIO_POWER_M18dBm = 0
RADIO_POWER_M12dBm = 1
RADIO_POWER_M6dBm = 2
RADIO_POWER_0dBm = 3
DefaultChannel = 10
DefaultDataRate = cflie.DATA_RATE_250K
)
var DefaultRadioAddress = [5]byte{0xE7, 0xE7, 0xE7, 0xE7, 0xE7}
var defaultContext = usb.NewContext()
var ErrDeviceNotFound = fmt.Errorf("Device not found")
var ErrTooManyDevicesMatch = fmt.Errorf("Too many devices match (> 1)")
// Open opens a CrazyRadio USB dongle
func Open(info cflie.DeviceInfo) (dev cflie.Device, err error) {
d, err := defaultContext.ListDevices(func(desc *usb.Descriptor) bool {
if desc.Vendor == Vendor && desc.Product == Product &&
int(desc.Bus) == info.Bus() && int(desc.Address) == info.Address() &&
uint16(desc.Device) == uint16(((info.MajorVer()&0xFF)<<8)+(info.MinorVer()&0xFF)) {
return true
}
return false
})
if err != nil {