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INTERRUPT CONTROL UNIT

/*****************************************************************************

InitICUSlave

Description:

Initialization only the internal slave Interrupt Control Units (ICU).

This routine only initializes the internal interrupt controller,

external ICUs must be initialized separately.

Parameters:

SlaveMode Mode of operation for Slave ICU

SlaveBase Specifies the base interrupt vector number for the

Slave interrupts.

For example, if IR1 of the slave goes active and the

SlaveBase = 0x40 the processor uses interrupt

vector table entry 0x41.

SlavePins Defines what EX pins are available externally to the

chip for the Slave.

Returns:Error Code

E_OK -- Initialized OK, No error.

Assumptions:

REMAPCFG register has Expanded I/O space access enabled (ESE bit set).

Syntax:

/* ICU Modes */

#define ICU_SFNM 0x10

#define ICU_AUTOEOI 0x2

#define ICU_TRIGGER_LEVEL 0x8

#define ICU_TRIGGER_EDGE 0x0

/* ICU Slave Pins */

#define SPIN_INT4 0x1

#define SPIN_INT5 0x2

#define SPIN_INT6 0x4

#define SPIN_INT7 0x8

int error_code;

error_code = InitICUSlave(ICU_TRIGGER_EDGE, 0x30, SPIN_INT4);

Real/Protected Mode

No changes required.

*****************************************************************************/

int InitICUSlave(BYTE SlaveMode, BYTE SlaveBase, BYTE SlavePins)

{

BYTE cfg_pins;

/* Program Slave ICU */

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