CS18101X datasheet(34/54 Pages) CIRRUS

34 / 54 page

DS651UM23

Version 2.3

CobraNet Hardware User’s Manual

HMI Reference Code

8.2

HMI Access Code

/*========================================================================

** hmi.c

** CobraNet Host Management Interface example code

** Simple edition

**------------------------------------------------------------------------

** $Header$

**========================================================================*/

#include "hmi.h"

/* variables model HMI state */

long PeekLimit;

long PeekPointer = -1;

long PokeLimit;

long PokePointer = -1;

/* access host port hardware */

#define HMI_BASE 0

unsigned char ReadRegister(

int hmiregister )

{

return *(unsigned char volatile *const) ( hmiregister + HMI_BASE );

}

void WriteRegister(

int hmiregister,

unsigned char value )

{

*(unsigned char volatile *const) ( hmiregister + HMI_BASE ) = value;

}

void SendMessage(

unsigned char message )

{

int msgack = ReadRegister( MSG_D );

/* issue (last byte of) message */

WriteRegister( MSG_D, message );

/* wait for acceptance of message */

while( !( ( msgack ^ ReadRegister( MSG_D ) ) & ( 1 << MSG_TOGGLE_BO ) ) );

}

void SetAddress(

long address )

{

/* translate address */

WriteRegister( MSG_A, ( address & 0xff0000 ) >> 16 );

WriteRegister( MSG_B, ( address & 0xff00 ) >> 8 );

WriteRegister( MSG_C, address & 0xff );

SendMessage( CVR_TRANSLATE_ADDRESS );

/* wait for completion of translate address */

CS18101X Datasheet(PDF) 34 Page - Cirrus Logic

CS18101X Datasheet(HTML) 34 Page - Cirrus Logic

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