Agilent Technologies FS2010 Guida Utente Scaricare il pdf (Pagina 122)

122 Agilent VISA User’s Guide

4 Programming via GPIB and VXI

Although the resource handles the allocation and operation

of the window, the programmer must free the window via

viUnMapAddress when finished. This makes the window

available for the system to reallocate.

Sample: MEMACC Resource Program

This program demonstrates one way to use the MEMACC

resource to open the entire VXI A16 memory and then

calculate an offset to address a specific device.

/* peek16.c */

#include <stdio.h>

#include <stdlib.h>

#include <visa.h>

#define EXIT1

#define NO_EXIT 0

/* This function simplifies checking for VISA

errors. */

void checkError( ViSession vi, ViStatus status,

char

*errStr,int doexit){

char buf[256];

if (status >= VI_SUCCESS)

return;

buf[0] = 0;

viStatusDesc( vi, status, buf );

printf( "ERROR 0x%lx (%s)\n ’%s’\n", status,

errStr,

buf );

if ( doexit == EXIT )

exit ( 1 );

}

void main() {

ViSession drm;

ViSession vi;

ViUInt16inData16 = 0;

ViUInt16peekData16 = 0;

ViUInt8*addr;

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Agilent Technologies FS2010 Guida Utente Pagina 122