MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Guide de l'utilisateur télécharger pdf (Page 293)

100

101

Interrupt Handling

11-15

Asynchronous Interrupt Block Example - RTW Mode

This example shows the Asynchronous Interrupt block in RTW mode:

Note that the simulated plant signals that were included in the previous

example have been omitted. In RTW mode, the Asynchronous Interrupt block

receives interrupts directly from the hardware.

During the Target Language Compiler (TLC) phase of code generation, the

Asynchronous Interrupt block installs the code in the Stateflow Chart and the

Subsystem block as interrupt service routines. Configuring a function-call

subsystem as an ISR requires two function calls,

int_connect and int_enable.

For example, the function

f(u) in the Function block requires this procedure:

• In the

mdlStart function, the Asynchronous Interrupt block inserts a call to

int_connect and sysIntEnable:

/* model start function */

MdlStart()

{

. . .

int_connect(f,192,1);

. . .

sysIntEnable(1);

. . .

}

* Plant is removed

Offset

192

Int Vector table

&f()

Stand-alone functions are

installed as ISR’s:

1 2 ... 288 289 290 291 292 293 294 295 296 297 298 ... 385 386

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Guide de l'utilisateur Page 293

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