ola::plugin::usbdmx::AsyncUsbSender Class Reference

Detailed Description

A base class that send DMX data asynchronously to a libusb_device.

This encapsulates much of the asynchronous libusb logic. Subclasses should implement the SetupHandle() and PerformTransfer() methods.

Inheritance diagram for ola::plugin::usbdmx::AsyncUsbSender:

Public Member Functions
	AsyncUsbSender (class LibUsbAdaptor *const adaptor, libusb_device *usb_device)
	Create a new AsyncUsbSender.
virtual	~AsyncUsbSender ()
	Destructor.
bool	Init ()
	Initialize the sender.
bool	SendDMX (const DmxBuffer &buffer)
	Send one frame of DMX data.
void	TransferComplete (struct libusb_transfer *transfer)
	Called from the libusb callback when the asynchronous transfer completes.

Protected Member Functions
virtual libusb_device_handle *	SetupHandle ()=0
	Open the device handle.
virtual bool	PerformTransfer (const DmxBuffer &buffer)=0
	Perform the DMX transfer.
virtual void	PostTransferHook ()
	Called when the transfer completes.
void	CancelTransfer ()
	Cancel any pending transfers.
void	FillControlTransfer (unsigned char *buffer, unsigned int timeout)
	Fill a control transfer.
void	FillBulkTransfer (unsigned char endpoint, unsigned char *buffer, int length, unsigned int timeout)
	Fill a bulk transfer.
void	FillInterruptTransfer (unsigned char endpoint, unsigned char *buffer, int length, unsigned int timeout)
	Fill an interrupt transfer.
int	SubmitTransfer ()
	Submit the transfer for tx.
bool	TransferPending () const
	Check if there is a pending transfer.

Protected Attributes
class LibUsbAdaptor *const	m_adaptor
	The LibUsbAdaptor passed in the constructor.
libusb_device *const	m_usb_device
	The libusb_device passed in the constructor.

Constructor & Destructor Documentation

ola::plugin::usbdmx::AsyncUsbSender::AsyncUsbSender	(	class LibUsbAdaptor *const	adaptor,
		libusb_device *	usb_device
	)

Create a new AsyncUsbSender.

Parameters

adaptor	the LibUsbAdaptor to use.
usb_device	the libusb_device to use for the widget.

Member Function Documentation

void ola::plugin::usbdmx::AsyncUsbSender::FillControlTransfer ( unsigned char *  buffer, unsigned int  timeout  )

protected

Fill a control transfer.

Parameters

buffer	passed to libusb_fill_control_transfer.
timeout	passed to libusb_fill_control_transfer.

bool ola::plugin::usbdmx::AsyncUsbSender::Init

(

)

Initialize the sender.

Returns

true if SetupHandle() returned a valid handle, false otherwise.

virtual bool ola::plugin::usbdmx::AsyncUsbSender::PerformTransfer ( const DmxBuffer &  buffer )

protectedpure virtual

Perform the DMX transfer.

Parameters

buffer

the DMX buffer to send.

Returns

true if the transfer was scheduled, false otherwise.

This method is implemented by the subclass. The subclass should call FillControlTransfer() / FillBulkTransfer() as appropriate and then call SubmitTransfer().

Implemented in ola::plugin::usbdmx::VellemanAsyncUsbSender, ola::plugin::usbdmx::FadecandyAsyncUsbSender, ola::plugin::usbdmx::EuroliteProAsyncUsbSender, ola::plugin::usbdmx::SunliteAsyncUsbSender, and ola::plugin::usbdmx::AnymaAsyncUsbSender.

virtual void ola::plugin::usbdmx::AsyncUsbSender::PostTransferHook ( )

inlineprotectedvirtual

Called when the transfer completes.

Some devices require multiple transfers per DMX frame. This provides a hook for continuation.

Reimplemented in ola::plugin::usbdmx::VellemanAsyncUsbSender.

bool ola::plugin::usbdmx::AsyncUsbSender::SendDMX

(

const DmxBuffer &

buffer

)

Send one frame of DMX data.

Parameters

buffer

the DMX data to send.

Returns

the value of PerformTransfer().

virtual libusb_device_handle* ola::plugin::usbdmx::AsyncUsbSender::SetupHandle ( )

protectedpure virtual

Open the device handle.

Returns

A valid libusb_device_handle or NULL if the device could not be opened.

Implemented in ola::plugin::usbdmx::VellemanAsyncUsbSender, ola::plugin::usbdmx::FadecandyAsyncUsbSender, ola::plugin::usbdmx::EuroliteProAsyncUsbSender, ola::plugin::usbdmx::SunliteAsyncUsbSender, and ola::plugin::usbdmx::AnymaAsyncUsbSender.

int ola::plugin::usbdmx::AsyncUsbSender::SubmitTransfer ( )

protected

Submit the transfer for tx.

Returns

the result of libusb_submit_transfer().

void ola::plugin::usbdmx::AsyncUsbSender::TransferComplete

(

struct libusb_transfer *

transfer

)

Called from the libusb callback when the asynchronous transfer completes.

Parameters

transfer

the completed transfer.

bool ola::plugin::usbdmx::AsyncUsbSender::TransferPending ( ) const

inlineprotected

Check if there is a pending transfer.

Returns

true if there is a transfer in progress, false otherwise.

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The documentation for this class was generated from the following files:

• plugins/usbdmx/AsyncUsbSender.h
• plugins/usbdmx/AsyncUsbSender.cpp