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Node.JS library for communicating with USB devices in JavaScript / CoffeeScript.
This is a refactoring / rewrite of Christopher Klein's node-usb. The API is not compatible (hopefully you find it an improvement).
It's based entirely on libusb's asynchronous API for better efficiency, and provides a stream API for continuously streaming data or events.
Libusb is included as a submodule. On Linux, you'll need libudev to build libusb. On Ubuntu/Debian: sudo apt-get install build-essential libudev-dev
Then, just run
to install from npm. See the bottom of this page for instructions for building from a git checkout.
Windows
Use Zadig to install the WinUSB driver for your USB device. Otherwise you will get LIBUSB_ERROR_NOT_SUPPORTED
when attempting to open devices.
usb
Top-level object.
usb.getDeviceList()
Return a list of Device
objects for the USB devices attached to the system.
usb.findByIds(vid, pid)
Convenience method to get the first device with the specified VID and PID, or undefined
if no such device is present.
usb.LIBUSB_*
Constant properties from libusb
usb.setDebugLevel(level : int)
Set the libusb debug level (between 0 and 4)
Device
Represents a USB device.
.busNumber
Integer USB device number
.deviceAddress
Integer USB device address
.portNumbers
Array containing the USB device port numbers, or undefined
if not supported on this platform.
.deviceDescriptor
Object with properties for the fields of the device descriptor:
- bLength
- bDescriptorType
- bcdUSB
- bDeviceClass
- bDeviceSubClass
- bDeviceProtocol
- bMaxPacketSize0
- idVendor
- idProduct
- bcdDevice
- iManufacturer
- iProduct
- iSerialNumber
- bNumConfigurations
.configDescriptor
Object with properties for the fields of the configuration descriptor:
- bLength
- bDescriptorType
- wTotalLength
- bNumInterfaces
- bConfigurationValue
- iConfiguration
- bmAttributes
- bMaxPower
- extra (Buffer containing any extra data or additional descriptors)
.allConfigDescriptors
.parent
.open()
Open the device. All methods below require the device to be open before use.
.close()
Close the device.
.controlTransfer(bmRequestType, bRequest, wValue, wIndex, data_or_length, callback(error, data))
Perform a control transfer with libusb_control_transfer
.
Parameter data_or_length
can be a integer length for an IN transfer, or a Buffer for an out transfer. The type must match the direction specified in the MSB of bmRequestType.
The data
parameter of the callback is always undefined for OUT transfers, or will be passed a Buffer for IN transfers.
.setConfiguration(id, callback(error))
Set the device configuration to something other than the default (0). To use this, first call .open(false)
(which tells it not to auto configure), then before claiming an interface, call this method.
.getStringDescriptor(index, callback(error, data))
Perform a control transfer to retrieve a string descriptor
.getBosDescriptor(callback(error, bosDescriptor))
Perform a control transfer to retrieve an object with properties for the fields of the Binary Object Store descriptor:
- bLength
- bDescriptorType
- wTotalLength
- bNumDeviceCaps
.getCapabilities(callback(error, capabilities))
Retrieve a list of Capability objects for the Binary Object Store capabilities of the device.
.interface(interface)
Return the interface with the specified interface number.
.interfaces
List of Interface objects for the interfaces of the default configuration of the device.
.timeout
Timeout in milliseconds to use for control transfers.
.reset(callback(error))
Performs a reset of the device. Callback is called when complete.
Interface
.endpoint(address)
Return the InEndpoint or OutEndpoint with the specified address.
.endpoints
List of endpoints on this interface: InEndpoint and OutEndpoint objects.
.interface
Integer interface number.
.altSetting
Integer alternate setting number.
.setAltSetting(altSetting, callback(error))
Sets the alternate setting. It updates the interface.endpoints
array to reflect the endpoints found in the alternate setting.
.claim()
Claims the interface. This method must be called before using any endpoints of this interface.
.release([closeEndpoints], callback(error))
Releases the interface and resets the alternate setting. Calls callback when complete.
It is an error to release an interface with pending transfers. If the optional closeEndpoints parameter is true, any active endpoint streams are stopped (see Endpoint.stopStream
), and the interface is released after the stream transfers are cancelled. Transfers submitted individually with Endpoint.transfer
are not affected by this parameter.
.isKernelDriverActive()
Returns false
if a kernel driver is not active; true
if active.
.detachKernelDriver()
Detaches the kernel driver from the interface.
.attachKernelDriver()
Re-attaches the kernel driver for the interface.
.descriptor
Object with fields from the interface descriptor -- see libusb documentation or USB spec.
- bLength
- bDescriptorType
- bInterfaceNumber
- bAlternateSetting
- bNumEndpoints
- bInterfaceClass
- bInterfaceSubClass
- bInterfaceProtocol
- iInterface
- extra (Buffer containing any extra data or additional descriptors)
Capability
.type
Integer capability type.
.data
Buffer capability data.
.descriptor
Object with fields from the capability descriptor -- see libusb documentation or USB spec.
- bLength
- bDescriptorType
- bDevCapabilityType
Endpoint
Common base for InEndpoint and OutEndpoint, see below.
.direction
Endpoint direction: 'in'
or 'out'
.
.transferType
Endpoint type: usb.LIBUSB_TRANSFER_TYPE_BULK
, usb.LIBUSB_TRANSFER_TYPE_INTERRUPT
, or usb.LIBUSB_TRANSFER_TYPE_ISOCHRONOUS
.
.descriptor
Object with fields from the endpoint descriptor -- see libusb documentation or USB spec.
- bLength
- bDescriptorType
- bEndpointAddress
- bmAttributes
- wMaxPacketSize
- bInterval
- bRefresh
- bSynchAddress
- extra (Buffer containing any extra data or additional descriptors)
.timeout
Sets the timeout in milliseconds for transfers on this endpoint. The default, 0
, is infinite timeout.
.clearHalt(callback(error))
Clear the halt/stall condition for this endpoint.
InEndpoint
Endpoints in the IN direction (device->PC) have this type.
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.transfer(length, callback(error, data))
Perform a transfer to read data from the endpoint.
If length is greater than maxPacketSize, libusb will automatically split the transfer in multiple packets, and you will receive one callback with all data once all packets are complete.
this
in the callback is the InEndpoint object.
.startPoll(nTransfers=3, transferSize=maxPacketSize)
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Start polling the endpoint.
The library will keep nTransfers
transfers of size transferSize
pending inthe kernel at all times to ensure continuous data flow. This is handled by thelibusb event thread, so it continues even if the Node v8 thread is busy. Thedata
and error
events are emitted as transfers complete.
.stopPoll(cb)
Stop polling.
Further data may still be received. The end
event is emitted and the callbackis called once all transfers have completed or canceled.
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Event: data(data : Buffer)
Emitted with data received by the polling transfers
Event: error(error)
Emitted when polling encounters an error. All in flight transfers will be automatically canceled and no further polling will be done. You have to wait for the end
event before you can start polling again.
Event: end
Emitted when polling has been canceled
OutEndpoint
Endpoints in the OUT direction (PC->device) have this type.
.transfer(data, callback(error))
Perform a transfer to write data
to the endpoint.
If length is greater than maxPacketSize, libusb will automatically split the transfer in multiple packets, and you will receive one callback once all packets are complete.
this
in the callback is the OutEndpoint object.
Event: error(error)
Emitted when the stream encounters an error.
Event: end
Emitted when the stream has been stopped and all pending requests have been completed.
UsbDetection
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usb.on('attach', function(device) { ... });
Attaches a callback to plugging in a device
.
usb.on('detach', function(device) { ... });
Attaches a callback to unplugging a device
.
To build from git:
To execute the unit tests, CoffeeScript is required. Run
Some tests require an attached USB device -- firmware to be released soon.
Does not support:
- Configurations other than the default one
- Isochronous transfers
MIT
Note that the compiled Node extension includes Libusb, and is thus subject to the LGPL.
Current Tags
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