Initial revision

src/ca/evtime.c

@@ -0,0 +1,88 @@
+
+#include <cadef.h>
+#include <dbDefs.h>
+
+void event_handler(struct event_handler_args args);
+int main(int argc, char **argv);
+int evtime(char *pname);
+
+static unsigned 	iteration_count;
+static unsigned		last_time;
+static double		rate;
+
+#ifndef vxWorks
+main(int argc, char **argv)
+{
+        char    *pname;
+
+        if(argc == 2){
+                pname = argv[1];
+                evtime(pname);
+        }
+        else{
+                printf("usage: %s <channel name>", argv[0]);
+        }
+}
+#endif
+
+
+
+
+/*
+ * evtime()
+ */
+int evtime(char *pname)
+{
+	chid	chan;
+	int	status;
+
+	status = ca_search(pname,  &chan);
+	SEVCHK(status, NULL);
+
+	status = ca_pend_io(10.0);
+	if(status != ECA_NORMAL){
+		printf("%s not found\n", pname);
+		return OK;
+	}
+
+	rate = sysClkRateGet();
+
+	status = ca_add_event(
+			DBR_FLOAT,
+			chan,
+			event_handler,
+			NULL,
+			NULL);
+	SEVCHK(status, __FILE__);
+
+	status = ca_pend_event(0.0);
+	SEVCHK(status, NULL);
+}
+
+
+/*
+ * event_handler()
+ *
+ */
+void event_handler(struct event_handler_args args)
+{
+	unsigned		current_time;
+#	define 			COUNT	0x8000
+	double			interval;
+	double			delay;
+
+	if(iteration_count%COUNT == 0){
+		current_time = tickGet();
+		if(last_time != 0){
+			interval = current_time - last_time;
+			delay = interval/(rate*COUNT);
+			printf("Delay = %f sec for 1 event\n",
+				delay,
+				COUNT);
+		}
+		last_time = current_time;
+	}
+
+	iteration_count++;
+}
+