Operator EventToHost

Operator Library: Base

The operator generates software events for rising edges at its input links. The operator provides up to 16 input ports which can raise events.

All N inputs (up to 16) can generate individual events. The event will not provide any signal link data. Commonly, this operator is used to monitor the status of GPIOs or to signal special conditions.

Each input port is associated with the correspondent event. The event is identified by the software application by using the unique event name (parameter EventName_ (see parameter description below)).

The operator uses one resource of type EventPort exclusively. You can modify resource EventPort. EventPort specifies which event chanel is used by the software. Each EventPort number can only be used once in a design.

In addition, for each input port a resource of type EventID is reserved. You cannot modify this resource (therefore displayed in grey) as the EventID is generated automatically. If, via copy & paste, you have the same EventID in different operator instances, you need to delete one of these instances and to instanciate the operator anew.

[Tip] Limited Amount of Event Ports and of Individual Events

The maximum amount of event ports available in a design depends on the target hardware platform you are designing for (see Apendix, section ' Device Resources of Supported Platforms ' for detailed information).

If you design an applet for use in the runtime environment, you can use a maximum of 64 individual events in a design.

[Tip] After Copy & and Pasting the Operator

After Copy & and Paste, you have to adapt the resources to ensure each EventPort and each EvendID is used only once in the design.

To adapt the resources:

  1. Click on the Resources button in the tool bar.

    The resources that are overmapped are displayed in red:

  2. Enter a EventPort number for the event port that has not been used so far in the design:

    Since the EventID is not editable, but generated automatically, you cannot enter new values for EventID.

  3. Click the OK button. The following message is displayed:

  4. Click on Apply. The Resources dialog closes. If you re-open it, you will see, that for the EventIDs unique values have been generated:

I/O Properties

Property Value
Operator Type M
Input Link I[000-015], Signal input to raise a software event.

Supported Link Format

Link Parameter Input Link I[000-015]
Bit Width 1
Arithmetic unsigned
Parallelism 1
Kernel Columns 1
Kernel Rows 1
Img Protocol VALT_SIGNAL
Color Format VAF_GRAY
Color Flavor FL_NONE
Max. Img Width any
Max. Img Height any


Type static/dymanic write parameter
Default ON
Range {ON,OFF}

Defines if high-precision timestamps are attached to each event.
ON = timestamps are generated.
OFF = no timestamps are generated.

Type static write parameter
Default EventName_[n]

Every event input must be assigned a unique identifier name. This event name is used to identify and use a particular hardware event signal in the Framegrabber SDK.

Examples of Use

The use of operator EventToHost is shown in the following examples:

  • 'Hardware Test'

    An example for hardware self test of DMA, RAM, GPIOs, Trigger and LEDs.