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SCIOPTA - Real-Time Kernel

5-6 Manual Version 4.1 User’s Manual

SCIOPTA - Real-Time Kernel

5 Processes

5.7.3.2 Interrupt Source Parameter

The interrupt process declaration has beside the process name a second parameter (<irq_src> see chapter 5.7.3.1

“Interrupt Process Declaration Syntax” on page 5-5) which defines the interrupt source. This parameter is set by

the kernel depending on the interrupt source.

Interrupt Source Parameter Values

0 The interrupt process is activated by a real hardware interrupt.

1 The interrupt process is activated by a message sent to the interrupt process.

2 The interrupt process is activated by a trigger event.

-1 The interrupt process is activated when the process is created. This allows the interrupt process to execute some

initialization code.

-2 The interrupt process is activated when the process is killed. This allows the interrupt process to execute some

exit code.

5.7.3.3 Interrupt Process Template

In this chapter a template for an interrupt process in SCIOPTA is provided.

#include <sciopta.h> /* SCIOPTA standard prototypes and definitions */

SC_INT_PROCESS (proc_name, irq_src)/* Declaration for interrupt process proc_name */

{

/* Local variables */

if (irq_src == 0) /* Generated by hardware */

{

/* Code for hardware interrupt handling */

}

else if (irq_src == -1) /* Generated when process created */

{

/* Initialization code */

}

else if (irq_src == -2) /* Generated when process killed */

{

/* Exit code */

}

else if (irq_src == 1) /* Generated by a message sent to this interrupt process */

{

/* Code for receiving a message */

}

else if (irq_src == 2) /* Generated by a SCIOPTA trigger event */

{

/* Code for trigger event handling */

}

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CompuLab SBC-X270 Manual do Utilizador Página 46