Agilent Technologies E2094S Guia do Utilizador descarregar pdf (Página 107)

Programming via GPIB and VXI 4

Agilent VISA User’s Guide 107

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 E2094S Guia do Utilizador Página 107