device

package
v0.3.0 Latest Latest
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 Go to latest Published: Jun 27, 2026 License: MIT Imports: 13 Imported by: 0

Documentation

Overview

Package device provides an abstraction layer for USB device communication. It defines interfaces for interacting with the Corsair iCUE Nexus display device.

Package device provides Nexus device implementation using direct libusb access.

Index

Constants

View Source 
const (
	DisplayWidth  = 640
	DisplayHeight = 48
	FrameSize     = DisplayWidth * DisplayHeight * 4 // RGBA
)

FrameConstants defines the display dimensions and buffer sizes.

Variables

View Source 
var (
	ErrDeviceNotFound     = errors.New("device not found")
	ErrDeviceDisconnected = errors.New("device disconnected")
	ErrInvalidFrame       = errors.New("invalid frame data")
	ErrConnectionFailed   = errors.New("connection failed")
	ErrInterfaceFailed    = errors.New("failed to claim USB interface")
	ErrConfigFailed       = errors.New("failed to configure device")
	ErrSendFailed         = errors.New("failed to send data")
)

Common errors returned by Device implementations.

View Source 
var (
	ErrPermissionDenied = errors.New("USB permission denied")
	ErrDeviceBusy       = errors.New("device busy")
)

Additional sentinel errors for actionable UI messages.

Functions

func NewDeviceError 

func NewDeviceError(op string, err error) error

NewDeviceError creates a new DeviceError.

Types

type ConnectionConfig 

type ConnectionConfig struct {
	VendorID         uint16        // USB Vendor ID (0x1b1c for Corsair)
	ProductID        uint16        // USB Product ID (0x1b8e for iCUE Nexus)
	ReconnectRetries int           // Number of reconnection attempts
	ReconnectDelay   time.Duration // Delay between reconnection attempts
}

ConnectionConfig holds configuration for device connection.

type Device 

type Device interface {
	// Connect establishes a connection to the device.
	// Returns ErrDeviceNotFound if no device is found.
	Connect(ctx context.Context) error

	// Disconnect closes the device connection and releases resources.
	Disconnect() error

	// IsConnected returns the current connection status.
	IsConnected() bool

	// SendFrame sends a complete frame of image data to the device.
	// The data must be in the correct format (640x48 pixels, RGBA).
	// Returns ErrDeviceDisconnected if the device is not connected.
	SendFrame(ctx context.Context, data []byte) error

	// ReadTouch reads touch input events from the device (non-blocking).
	// Returns empty slice if no events are available.
	ReadTouch(ctx context.Context) ([]touch.Event, error)

	// Health performs a health check on the device connection.
	// Returns nil if healthy, error otherwise.
	Health() error

	// HID Feature Report methods (may not be supported by all devices)
	SetBrightness(brightness int) error
	GetFirmwareVersion() (string, error)
	GetDeviceInfo() DeviceInfo
}

Device represents a Nexus display device with USB communication capabilities.

type DeviceError 

type DeviceError struct {
	Op  string
	Err error
}

DeviceError wraps device-related errors with additional context.

func (*DeviceError) Error 

func (e *DeviceError) Error() string

func (*DeviceError) Unwrap 

func (e *DeviceError) Unwrap() error

type DeviceInfo 

type DeviceInfo struct {
	Manufacturer string
	Product      string
	VendorID     uint16
	ProductID    uint16
}

DeviceInfo holds static information read from the USB device at connect time.

type MockDevice 

type MockDevice struct {

	// Callbacks for testing
	OnConnect    func(ctx context.Context) error
	OnDisconnect func() error
	OnSendFrame  func(ctx context.Context, data []byte) error
	// contains filtered or unexported fields
}

MockDevice is a mock implementation of Device for testing.

func NewMockDevice 

func NewMockDevice() *MockDevice

NewMockDevice creates a new mock device.

func (*MockDevice) Connect 

func (m *MockDevice) Connect(ctx context.Context) error

Connect simulates connecting to a device.

func (*MockDevice) Disconnect 

func (m *MockDevice) Disconnect() error

Disconnect simulates disconnecting from a device.

func (*MockDevice) FailNext 

func (m *MockDevice) FailNext(operation string)

FailNext makes the next call to the specified operation fail.

func (*MockDevice) GetDeviceInfo 

func (m *MockDevice) GetDeviceInfo() DeviceInfo

GetDeviceInfo returns mock device info.

func (*MockDevice) GetFirmwareVersion 

func (m *MockDevice) GetFirmwareVersion() (string, error)

GetFirmwareVersion returns a mock firmware version.

func (*MockDevice) GetFramesSent 

func (m *MockDevice) GetFramesSent() int

GetFramesSent returns the number of frames sent.

func (*MockDevice) GetLastFrame 

func (m *MockDevice) GetLastFrame() []byte

GetLastFrame returns the last frame data sent.

func (*MockDevice) Health 

func (m *MockDevice) Health() error

Health performs a mock health check.

func (*MockDevice) IsConnected 

func (m *MockDevice) IsConnected() bool

IsConnected returns the mock connection status.

func (*MockDevice) ReadTouch 

func (m *MockDevice) ReadTouch(ctx context.Context) ([]touch.Event, error)

ReadTouch returns mock touch events.

func (*MockDevice) SendFrame 

func (m *MockDevice) SendFrame(ctx context.Context, data []byte) error

SendFrame simulates sending a frame to the device.

func (*MockDevice) SetBrightness 

func (m *MockDevice) SetBrightness(brightness int) error

SetBrightness simulates setting device brightness.

func (*MockDevice) SimulateDisconnect 

func (m *MockDevice) SimulateDisconnect()

SimulateDisconnect simulates a device disconnection.

func (*MockDevice) SimulateTouch 

func (m *MockDevice) SimulateTouch(button int, pressed bool, duration time.Duration)

SimulateTouch adds a mock touch event.

type NexusDevice 

type NexusDevice struct {
	// contains filtered or unexported fields
}

NexusDevice implements the Device interface via direct libusb transfers.

func NewNexusDevice 

func NewNexusDevice(logger *slog.Logger, config ConnectionConfig) *NexusDevice

NewNexusDevice creates a new Nexus device.

func (*NexusDevice) Connect 

func (n *NexusDevice) Connect(ctx context.Context) error

Connect establishes a USB connection to the device, retrying up to 3 times.

func (*NexusDevice) Disconnect 

func (n *NexusDevice) Disconnect() error

Disconnect closes the USB device connection.

func (*NexusDevice) GetDeviceInfo 

func (n *NexusDevice) GetDeviceInfo() DeviceInfo

GetDeviceInfo returns the manufacturer, product, and USB IDs read at connect time.

func (*NexusDevice) GetFirmwareVersion 

func (n *NexusDevice) GetFirmwareVersion() (string, error)

GetFirmwareVersion is not yet implemented via raw libusb.

func (*NexusDevice) Health 

func (n *NexusDevice) Health() error

Health returns an error if the device is not connected.

func (*NexusDevice) IsConnected 

func (n *NexusDevice) IsConnected() bool

IsConnected returns whether the device is currently connected.

func (*NexusDevice) ReadTouch 

func (n *NexusDevice) ReadTouch(ctx context.Context) ([]touch.Event, error)

ReadTouch reads touch events from the device.

func (*NexusDevice) SendFrame 

func (n *NexusDevice) SendFrame(ctx context.Context, data []byte) error

SendFrame sends a rendered frame to the device display.

func (*NexusDevice) SetBrightness 

func (n *NexusDevice) SetBrightness(brightness int) error

SetBrightness sets the display brightness (0–100).

Source Files

View all Source files

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