From 86416e8f0553dd07363392e127a1a8aed00e301d Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Fri, 1 Apr 2016 16:39:51 +1100
Subject: [PATCH] AP_Param: added set_default_by_name()

---
 libraries/AP_Param/AP_Param.cpp | 29 +++++++++++++++++++++++++++++
 libraries/AP_Param/AP_Param.h   |  7 +++++++
 2 files changed, 36 insertions(+)

diff --git a/libraries/AP_Param/AP_Param.cpp b/libraries/AP_Param/AP_Param.cpp
index a5c498ef25..624e5d118b 100644
--- a/libraries/AP_Param/AP_Param.cpp
+++ b/libraries/AP_Param/AP_Param.cpp
@@ -1834,3 +1834,32 @@ uint16_t AP_Param::count_parameters(void)
     return _parameter_count;
 }
 
+/*
+  set a default value by name
+ */
+bool AP_Param::set_default_by_name(const char *name, float value)
+{
+    enum ap_var_type vtype;
+    AP_Param *vp = find(name, &vtype);
+    if (vp == nullptr) {
+        return false;
+    }
+    switch (vtype) {
+    case AP_PARAM_INT8:
+        ((AP_Int8 *)vp)->set_default(value);
+        return true;
+    case AP_PARAM_INT16:
+        ((AP_Int16 *)vp)->set_default(value);
+        return true;
+    case AP_PARAM_INT32:
+        ((AP_Int32 *)vp)->set_default(value);
+        return true;
+    case AP_PARAM_FLOAT:
+        ((AP_Float *)vp)->set_default(value);
+        return true;
+    default:
+        break;
+    }
+    // not a supported type
+    return false;
+}
diff --git a/libraries/AP_Param/AP_Param.h b/libraries/AP_Param/AP_Param.h
index 2c3d25c3e8..bacb05d746 100644
--- a/libraries/AP_Param/AP_Param.h
+++ b/libraries/AP_Param/AP_Param.h
@@ -203,6 +203,13 @@ public:
     ///
     static AP_Param * find(const char *name, enum ap_var_type *ptype);
 
+    /// set a default value by name
+    ///
+    /// @param  name            The full name of the variable to be found.
+    /// @param  value           The default value
+    /// @return                 true if the variable is found
+    static bool set_default_by_name(const char *name, float value);
+    
     /// Find a variable by index.
     ///
     ///