Data Acquisition Toolbox

daqcallback

A callback function that displays event information for the specified event

Syntax

• daqcallback(obj,event)
  

Arguments

obj	A device object.
event	A variable that captures the event information contained by the EventLog property.

Description

daqcallback(obj,event) is an example callback function that displays information to the MATLAB command window. For all events, the information includes the event type and the name of the device object that caused the event to occur. For events that record the absolute time in EventLog, the event time is also displayed. For run-time error events, the error message is also displayed.

Remarks

You specify daqcallback as the callback function to be executed for any event by specifying it as the value for the associated callback property. For analog input objects, daqcallback is the default value for the DataMissedFcn and RuntimeErrorFcn properties. For analog output objects, daqcallback is the default value for the RuntimeErrorFcn property.

You can use the showdaqevents function to easily display event information captured by the EventLog property.

Example

Create the analog input object ai and call daqcallback when a trigger event occurs.

• ai = analoginput('winsound');
  addchannel(ai,1);
  set(ai,'TriggerRepeat',3)
  set(ai,'TriggerFcn',@daqcallback)
  start(ai)
  

See Also

Functions

showdaqevents

Properties

DataMissedFcn, EventLog, RuntimeErrorFcn

clear

daqfind