From edafb56273d4eb9fc6f49ae240fb36a714046cb6 Mon Sep 17 00:00:00 2001
From: Ralph Lange <Ralph.Lange@gmx.de>
Date: Wed, 30 Jul 2014 10:37:10 +0200
Subject: [PATCH] std/filters: make dbnd filter use recGblCheckDeadband()

---
 src/std/filters/dbnd.c | 26 ++++++++------------------
 1 file changed, 8 insertions(+), 18 deletions(-)

diff --git a/src/std/filters/dbnd.c b/src/std/filters/dbnd.c
index 3147c088f..36c852b2b 100644
--- a/src/std/filters/dbnd.c
+++ b/src/std/filters/dbnd.c
@@ -16,6 +16,7 @@
 #include <freeList.h>
 #include <dbConvertFast.h>
 #include <chfPlugin.h>
+#include <recGbl.h>
 #include <db_field_log.h>
 #include <epicsExport.h>
 
@@ -56,17 +57,11 @@ static int parse_ok(void *pvt)
     return 0;
 }
 
-static void shiftval (myStruct *my, double val) {
-    my->last = val;
-    if (my->mode == 1)
-        my->hyst = val * my->cval/100.;
-}
-
 static db_field_log* filter(void* pvt, dbChannel *chan, db_field_log *pfl) {
     myStruct *my = (myStruct*) pvt;
     long status;
-    double val, delta;
-    short drop = 0;
+    double val;
+    unsigned send = 1;
 
     /*
      * Only scalar values supported - strings, arrays, and conversion errors
@@ -81,19 +76,14 @@ static db_field_log* filter(void* pvt, dbChannel *chan, db_field_log *pfl) {
         status = dbFastGetConvertRoutine[pfl->field_type][DBR_DOUBLE]
                  (localAddr.pfield, (void*) &val, &localAddr);
         if (!status) {
-            if (isnan(my->last)) {
-                shiftval(my, val);
-            } else {
-                delta = fabs(my->last - val);
-                if (delta <= my->hyst) {
-                    drop = 1;
-                } else {
-                    shiftval(my, val);
-                }
+            send = 0;
+            recGblCheckDeadband(&my->last, val, my->hyst, &send, 1);
+            if (send && my->mode == 1) {
+                my->hyst = val * my->cval/100.;
             }
         }
     }
-    if (drop) {
+    if (!send) {
         db_delete_field_log(pfl);
         return NULL;
     } else return pfl;