chromex.app.usb — binaryage/chromex 0.8.6

clj

Use the chrome.usb API to interact with connected USB devices. This API provides access to USB operations from within the context of an app. Using this API, apps can function as drivers for hardware devices.

Errors generated by this API are reported by setting 'runtime.lastError' and executing the function's regular callback. The callback's regular parameters will be undefined in this case.

• available since Chrome 34
• https://developer.chrome.com/apps/usb

api-table clj

bulk-transfer clj/s macro

(bulk-transfer handle transfer-info)

Performs a bulk transfer on the specified device.

|handle| - An open connection to the device. |transfer-info| - The transfer parameters.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [info] where:

|info| - https://developer.chrome.com/apps/usb#property-callback-info.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-bulkTransfer.

bulk-transfer* cljs

(bulk-transfer* config handle transfer-info)

claim-interface clj/s macro

(claim-interface handle interface-number)

Claims an interface on a USB device. Before data can be transfered to an interface or associated endpoints the interface must be claimed. Only one connection handle can claim an interface at any given time. If the interface is already claimed, this call will fail.'releaseInterface' should be called when the interface is no longer needed.

|handle| - An open connection to the device. |interface-number| - The interface to be claimed.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [].

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-claimInterface.

claim-interface* cljs

(claim-interface* config handle interface-number)

close-device clj/s macro

(close-device handle)

Closes a connection handle. Invoking operations on a handle after it has been closed is a safe operation but causes no action to be taken.

|handle| - The 'ConnectionHandle' to close.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [].

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-closeDevice.

close-device* cljs

(close-device* config handle)

control-transfer clj/s macro

(control-transfer handle transfer-info)

Performs a control transfer on the specified device.Control transfers refer to either the device, an interface or an endpoint. Transfers to an interface or endpoint require the interface to be claimed.

|handle| - An open connection to the device. |transfer-info| - https://developer.chrome.com/apps/usb#property-controlTransfer-transferInfo.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [info] where:

|info| - https://developer.chrome.com/apps/usb#property-callback-info.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-controlTransfer.

control-transfer* cljs

(control-transfer* config handle transfer-info)

find-devices clj/s macro

(find-devices options)

Finds USB devices specified by the vendor, product and (optionally) interface IDs and if permissions allow opens them for use.If the access request is rejected or the device fails to be opened a connection handle will not be created or returned.Calling this method is equivalent to calling 'getDevices' followed by 'openDevice' for each device.

|options| - The properties to search for on target devices.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [handles] where:

|handles| - https://developer.chrome.com/apps/usb#property-callback-handles.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-findDevices.

find-devices* cljs

(find-devices* config options)

gen-call clj

gen-wrap clj/s macro

(gen-wrap kind item-id config & args)

get-configuration clj/s macro

(get-configuration handle)

Gets the configuration descriptor for the currently selected configuration.

|handle| - An open connection to the device.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [config] where:

|config| - https://developer.chrome.com/apps/usb#property-callback-config.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-getConfiguration.

get-configuration* cljs

(get-configuration* config handle)

get-configurations clj/s macro

(get-configurations device)

Returns the full set of device configuration descriptors.

|device| - The 'Device' to fetch descriptors from.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [configs] where:

|configs| - https://developer.chrome.com/apps/usb#property-callback-configs.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-getConfigurations.

get-configurations* cljs

(get-configurations* config device)

get-devices clj/s macro

(get-devices options)

Enumerates connected USB devices.

|options| - The properties to search for on target devices.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [devices] where:

|devices| - https://developer.chrome.com/apps/usb#property-callback-devices.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-getDevices.

get-devices* cljs

(get-devices* config options)

get-user-selected-devices clj/s macro

(get-user-selected-devices options)

Presents a device picker to the user and returns the 'Device's selected. If the user cancels the picker devices will be empty. A user gesture is required for the dialog to display. Without a user gesture, the callback will run as though the user cancelled.

|options| - Configuration of the device picker dialog box.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [devices] where:

|devices| - https://developer.chrome.com/apps/usb#property-callback-devices.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-getUserSelectedDevices.

get-user-selected-devices* cljs

(get-user-selected-devices* config options)

interrupt-transfer clj/s macro

(interrupt-transfer handle transfer-info)

Performs an interrupt transfer on the specified device.

|handle| - An open connection to the device. |transfer-info| - The transfer parameters.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [info] where:

|info| - https://developer.chrome.com/apps/usb#property-callback-info.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-interruptTransfer.

interrupt-transfer* cljs

(interrupt-transfer* config handle transfer-info)

isochronous-transfer clj/s macro

(isochronous-transfer handle transfer-info)

Performs an isochronous transfer on the specific device.

|handle| - An open connection to the device. |transfer-info| - https://developer.chrome.com/apps/usb#property-isochronousTransfer-transferInfo.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [info] where:

|info| - https://developer.chrome.com/apps/usb#property-callback-info.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-isochronousTransfer.

isochronous-transfer* cljs

(isochronous-transfer* config handle transfer-info)

list-interfaces clj/s macro

(list-interfaces handle)

Lists all interfaces on a USB device.

|handle| - An open connection to the device.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [descriptors] where:

|descriptors| - https://developer.chrome.com/apps/usb#property-callback-descriptors.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-listInterfaces.

list-interfaces* cljs

(list-interfaces* config handle)

on-device-added* cljs

(on-device-added* config channel & args)

on-device-removed* cljs

(on-device-removed* config channel & args)

open-device clj/s macro

(open-device device)

Opens a USB device returned by 'getDevices'.

|device| - The 'Device' to open.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [handle] where:

|handle| - https://developer.chrome.com/apps/usb#property-callback-handle.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-openDevice.

open-device* cljs

(open-device* config device)

release-interface clj/s macro

(release-interface handle interface-number)

Releases a claimed interface.

|handle| - An open connection to the device. |interface-number| - The interface to be released.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [].

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-releaseInterface.

release-interface* cljs

(release-interface* config handle interface-number)

request-access clj/s macro

(request-access device interface-id)

Requests access from the permission broker to a device claimed by Chrome OS if the given interface on the device is not claimed.

|device| - The 'Device' to request access to. |interface-id| - The particular interface requested.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [success] where:

|success| - https://developer.chrome.com/apps/usb#property-callback-success.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-requestAccess.

request-access* cljs

(request-access* config device interface-id)

reset-device clj/s macro

(reset-device handle)

Tries to reset the USB device. If the reset fails, the given connection handle will be closed and the USB device will appear to be disconnected then reconnected. In this case 'getDevices' or 'findDevices' must be called again to acquire the device.

|handle| - A connection handle to reset.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [success] where:

|success| - https://developer.chrome.com/apps/usb#property-callback-success.

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-resetDevice.

reset-device* cljs

(reset-device* config handle)

set-configuration clj/s macro

(set-configuration handle configuration-value)

Select a device configuration.This function effectively resets the device by selecting one of the device's available configurations. Only configuration values greater than 0 are valid however some buggy devices have a working configuration 0 and so this value is allowed.

|handle| - An open connection to the device. |configuration-value| - https://developer.chrome.com/apps/usb#property-setConfiguration-configurationValue.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [].

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-setConfiguration.

set-configuration* cljs

(set-configuration* config handle configuration-value)

set-interface-alternate-setting clj/s macro

(set-interface-alternate-setting handle interface-number alternate-setting)

Selects an alternate setting on a previously claimed interface.

|handle| - An open connection to the device where this interface has been claimed. |interface-number| - The interface to configure. |alternate-setting| - The alternate setting to configure.

This function returns a core.async channel of type promise-chan which eventually receives a result value. Signature of the result value put on the channel is [].

In case of an error the channel closes without receiving any value and relevant error object can be obtained via chromex.error/get-last-error.

https://developer.chrome.com/apps/usb#method-setInterfaceAlternateSetting.

set-interface-alternate-setting* cljs

(set-interface-alternate-setting* config
                                  handle
                                  interface-number
                                  alternate-setting)

tap-all-events clj/s macro

(tap-all-events chan)

Taps all valid non-deprecated events in chromex.app.usb namespace.

tap-on-device-added-events clj/s macro

(tap-on-device-added-events channel & args)

Event generated when a device is added to the system. Events are only broadcast to apps and extensions that have permission to access the device. Permission may have been granted at install time, when the user accepted an optional permission (see 'permissions.request'), or through 'getUserSelectedDevices'.

Events will be put on the |channel| with signature [::on-device-added [device]] where:

|device| - https://developer.chrome.com/apps/usb#property-onDeviceAdded-device.

Note: |args| will be passed as additional parameters into Chrome event's .addListener call.

https://developer.chrome.com/apps/usb#event-onDeviceAdded.

tap-on-device-removed-events clj/s macro

(tap-on-device-removed-events channel & args)

Event generated when a device is removed from the system. See 'onDeviceAdded' for which events are delivered.

Events will be put on the |channel| with signature [::on-device-removed [device]] where:

|device| - https://developer.chrome.com/apps/usb#property-onDeviceRemoved-device.

Note: |args| will be passed as additional parameters into Chrome event's .addListener call.

https://developer.chrome.com/apps/usb#event-onDeviceRemoved.