usb-6009

NI-VISA/Examples/C/PXI/RouteTrig.c

@@ -0,0 +1,80 @@
+/**************************************************************
+ * This example opens a session to a PXI BACKPLANE resource and 
+ * routes trigger lines for an identified PXI system. 
+ * The PXI BACKPLANE resource will follow the format: 
+ *	PXI0::?::BACKPLANE 
+ * where ? is the number of your PXI chassis in MAX. 
+ * 
+ * Note that this program routes triggers from a source bus 
+ * to a destination bus but does not reserve a trigger line 
+ * in the source bus. This could allow multiple boards to drive 
+ * a single trigger line which could damage your hardware. 
+ * See the "Reserve PXI Trigger" example for a method of reserving 
+ * the source trigger so automatic drivers such as DAQmx avoid 
+ * using the same line.
+ * 
+ * For more information on PXI Timing and Triggering, please see 
+ * KB 3TCCT2D8 at ni.com/support
+ ***************************************************************/
+
+/* Includes */
+#define NIVISA_PXI /* to include PXI VISA Attributes */
+
+#include <visa.h>
+
+/* Prototypes */
+int RouteTrigger (ViInt16 myTrigger, int mySourceSegment, int myDestinationSegment);
+
+/* Definitions */
+int main (void)
+{
+	ViStatus status;
+
+	status = RouteTrigger (0, 1, 3);
+
+	return status;
+}
+
+int RouteTrigger (ViInt16 myTrigger, int mySourceSegment, int myDestinationSegment) 
+{
+	ViSession RsrcManager;
+	ViSession vi;
+	ViStatus status = VI_SUCCESS;
+
+	/* Open VISA Resource Manager and PXI Backplane Resource */
+	status = viOpenDefaultRM (&RsrcManager);
+	if (status < VI_SUCCESS)
+		goto RouteDone;
+
+	status = viOpen (RsrcManager, "PXI0::2::BACKPLANE", 0, 0, &vi);
+	if (status < VI_SUCCESS)
+		goto CloseRMSession;
+	
+	/* Set the Source and Destination bus PXI VISA Attributes */
+	status = viSetAttribute (vi, VI_ATTR_PXI_SRC_TRIG_BUS, mySourceSegment);
+	if (status < VI_SUCCESS)
+		goto CloseBackplaneSession;
+
+	status = viSetAttribute (vi, VI_ATTR_PXI_DEST_TRIG_BUS,myDestinationSegment);
+	if (status < VI_SUCCESS)
+		goto CloseBackplaneSession;
+	
+	/* Route the trigger */
+	status = viMapTrigger (vi, myTrigger, myTrigger, VI_NULL);
+	if (status < VI_SUCCESS)
+		goto CloseBackplaneSession;
+	
+	/* TODO: Enter code that requires the trigger routed here */
+	
+	/* UnRoute the trigger - only do this if we succeeded in Routing */
+	status = viUnmapTrigger (vi, myTrigger, myTrigger);
+	
+CloseBackplaneSession:
+	/* Close your VISA Sessions */
+	status = viClose (vi);
+CloseRMSession:
+	status = viClose (RsrcManager);
+RouteDone:
+	return (status);
+}
+