include stdio h for printf

#include <stdio.h>  // for printf()

#include <stdlib.h> // for exit()

#include "visa.h"

 

#define EXIT    1

#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;

   ViUInt16  inData16  = 0;

   ViUInt16  peekData16= 0;

   ViUInt8   *addr;

   ViUInt16  *addr16;

   ViStatus  status;

   ViUInt16  offset;

 

   status = viOpenDefaultRM( &drm );

   checkError( 0, status, "viOpenDefaultRM", EXIT );

   //

   // Open a session to the vxi memacc resource

   //

   status = viOpen( drm, "vxi0::memacc", VI_NULL, VI_NULL, &vi );

   checkError( drm, status, "viOpen", EXIT );

   //

   // Calculate the A16 offset of the VXI registers for the device

   // at VXI logical address 8

   //

   offset = 0xc000 + 64 * 8;

   //

   // Open a map to all of A16 space

   //

   status = viMapAddress( vi, VI_A16_SPACE, 0, 0x10000, VI_FALSE, 0, (ViPAddr)(&addr) );

   checkError( vi, status, "viMapAddress", EXIT );

   //

   // Offset the address pointer returned from viMapAddress for use with viPeek16

   //

   addr16 = (ViUInt16 *)(addr + offset );

   //

   // Peek the contents of the card's ID register (Offset 0 from card's base address)

   // Note that viPeek does not return a status code.

   //

   viPeek16( vi, addr16, &peekData16 );

   //

   // Now use viIn16 and read the contents of the same register

   //

   status = viIn16( vi, VI_A16_SPACE, (ViBusAddress)offset, &inData16 );

   checkError( vi, status, "viIn16", NO_EXIT );

   //

   // Print the results

   //

   printf( "inData16  : 0x%04hx\n", inData16 );

   printf( "peekData16: 0x%04hx\n", peekData16 );

 

   viClose( vi );

   viClose( drm );

}