MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manual de usuario descargar pdf (Pagina 373)

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101

Events and Callbacks

8-53

You pass additional parameters to the callback function by including both the

callback function and the parameters as elements of a cell array. For example,

to pass the MATLAB variable

time to mycallback

time = datestr(now,0);

s.BytesAvailableFcnMode = 'terminator';

s.BytesAvailableFcn = {@mycallback,time};

Alternatively, you can specify the callback function as a string in the cell array.

s.BytesAvailableFcn = {'mycallback',time};

The corresponding function header is

function mycallback(obj,event,time)

If you pass additional parameters to the callback function, then they must be

included in the function header after the two required arguments.

Note You can also specify the callback function as a string. In this case, the

callback is evaluated in the MATLAB workspace and no requirements are

made on the input arguments of the callback function.

Enabling Callback Functions After They Error

If an error occurs while an callback function is executing, then:

•The callback function is automatically disabled.

•A warning is displayed at the command line, indicating that the callback

function is disabled.

If you want to enable the same callback function, then you must disconnect the

object with the

fclose function. If you want to use a different callback function,

then the callback will be enabled when you configure the callback property to

the new value.

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