vxill c

/*vxill.c

  This example program uses the low level functions to

  read the id and device type registers of the device

  at VXI0::24.  Change this address if necessary.  The

  register contents are then displayed.*/

 

#include <visa.h>

#include <stdlib.h>

#include <stdio.h>

 

void main () {

 

  ViSession defaultRM, dmm;

  ViAddr address;

  unsigned short id_reg, devtype_reg;

 

  /* Open session to VXI device at address 24 */

  viOpenDefaultRM (&defaultRM);

  viOpen (defaultRM, "VXI0::24::INSTR", VI_NULL,VI_NULL, &dmm);

 

  /* Map into memory space */

  viMapAddress (dmm, VI_A16_SPACE, 0x00, 0x10, VI_FALSE, VI_NULL, &address);

 

  /* Read instrument id register contents */

  viPeek16 (dmm, address, &id_reg);

 

  /* Read device type register contents */

  /* ViAddr is defined as a void * so we must cast it to something else */

  /* in order to do pointer arithmetic */

  viPeek16 (dmm, (ViAddr)((ViUInt16 *)address + 0x01), &devtype_reg);

 

  /* Unmap memory space */

  viUnmapAddress (dmm);

 

  /* Print results */

  printf ("ID Register = 0x%4X\n", id_reg);

  printf ("Device Type Register = 0x%4X\n", devtype_reg);

 

  /* Close sessions */

  viClose (dmm);

  viClose (defaultRM);

}