vmedev.c

HP GPIB的VB和C语言库文件,参考范例.

/* vmedev.c
   This example program opens a VXI interface session and sets
   up an interrupt handler.  When the specified interrupt occurs,
   the procedure defined in the interrupt handler is called. */
#include <stdio.h>
#include <stdlib.h>
#include <sicl.h>

#define ADDR "vxi"

void handler (INST id, long reason, long secval){
  printf ("Got the interrupt\n");
}

void main ()
{
  unsigned short reg;
  char *base_addr;
  INST id;

  /* install error handler */
  ionerror (I_ERROR_EXIT);

  /* open an interface communications session */
  id = iopen (ADDR);

  /* install interrupt handler */
  ionintr (id, handler);
  isetintr (id, I_INTR_VXI_VME, 1);

  /* turn off interrupt notification */
  iintroff ();

  /* map into user memory space */
  base_addr = imap (id, I_MAP_A24, 0x40, 1, NULL);

  /* read a register */
  reg = iwpeek((unsigned short *)(base_addr + 0x00));
 
  /* print contents */
  printf ("The registers contents were as follows:  0x%4X\n", reg);

  /* write to a register causing interrupt */
  iwpoke ((unsigned short *)(base_addr + 0x00), reg);

  /* wait for interrupt */
  iwaithdlr (10000);

  /* turn on interrupt notification */
  iintron ();

  /* unmap memory space */
  iunmap (id, base_addr, I_MAP_VXIDEV, 0x40, 1);

  /* close session */
  iclose (id);
}