/* This example illustrates the use of simple trigger functions with
 * the NIVXI library.  This program starts by sourcing one of the TTL
 * trigger lines using the function SrcTrig(...).  Next a call to
 * EnableTrigSense(...) is made to sensitize the CPU to triggers occuring
 * on a certain TTL line.  Next we halt execution of the program until
 * we receive a trigger on the line we just enabled using the function
 * WaitForTrigger(...).  
 * 
 * See the documentation in the NI-VXI Software Reference Manual for
 * complete information on these functions in the chapter entitled
 * 'VXI Trigger Functions'.  For detailed technical information on
 * VXI triggers, consult the National Instruments Technical Note #40
 * 'Triggering with NI-VXI' available on line or through your sales
 * representative.
 */  


#include "nivxi.h"
#include <stdio.h>
#include <conio.h>

#define ON 0
#define OFF 1
#define SYNC 4

main()
{
  INT16 ret;
  UINT16 line = 4;
  UINT16 source_line = 5;
  UINT16 prot;
  
  
  printf("\nYou can run this example with VICtext.  If it is not already running,");
  printf("\nyou can quit this program, launch VICtext, then run this program again.");
  printf("\nRun the trig.log script file in VICtext by typing");
  printf("\n'$ \"<path>\\trig.log'\" at the prompt.  This instructs VICtext to assert");
  printf("\ntrigger line 4.");

  ret = InitVXIlibrary();       /* Initialize VXI library */
  
  prot = ON;

  printf("Sourcing TTL Line %d\n", source_line);
  ret = SrcTrig (-1, source_line, prot, 10000L); /* Source a line on TTL backplane */

  prot = SYNC;

  ret = EnableTrigSense(-1, line, prot); /* Sensitize the CPU to recognize
                                          * VXI triggers */

  printf("Waiting for trigger on line %d\n", line);
  ret = WaitForTrig(-1, line, 30000L); /* Wait up to 30 seconds for a 
					* trigger on the TTL line 
					* specified in 'line'.*/
  if (ret == 0)
  {
	printf("Got the Trigger!\n");
  }
  
  /* When we get the trigger from the instrument (VICtext), stop driving
   * the 'source_line' TTL trigger */
  
  prot = OFF;

  ret = SrcTrig (-1, source_line, prot, 10000L);

  
  printf("\nPress any key to exit...");
  while (!kbhit());

  ret = CloseVXIlibrary();
  return 0;
}