parameters: add param_reset_no_notification()

- add reset() to Param<>

platforms/common/include/px4_platform_common/param.h

@@ -132,6 +132,12 @@ public:
 
 	void set(float val) { _val = val; }
 
+	void reset()
+	{
+		param_reset_no_notification(handle());
+		update();
+	}
+
 	bool update() { return param_get(handle(), &_val) == 0; }
 
 	param_t handle() const { return param_handle(p); }
@@ -166,6 +172,12 @@ public:
 
 	void set(float val) { _val = val; }
 
+	void reset()
+	{
+		param_reset_no_notification(handle());
+		update();
+	}
+
 	bool update() { return param_get(handle(), &_val) == 0; }
 
 	param_t handle() const { return param_handle(p); }
@@ -198,6 +210,12 @@ public:
 
 	void set(int32_t val) { _val = val; }
 
+	void reset()
+	{
+		param_reset_no_notification(handle());
+		update();
+	}
+
 	bool update() { return param_get(handle(), &_val) == 0; }
 
 	param_t handle() const { return param_handle(p); }
@@ -232,6 +250,12 @@ public:
 
 	void set(int32_t val) { _val = val; }
 
+	void reset()
+	{
+		param_reset_no_notification(handle());
+		update();
+	}
+
 	bool update() { return param_get(handle(), &_val) == 0; }
 
 	param_t handle() const { return param_handle(p); }
@@ -272,6 +296,12 @@ public:
 
 	void set(bool val) { _val = val; }
 
+	void reset()
+	{
+		param_reset_no_notification(handle());
+		update();
+	}
+
 	bool update()
 	{
 		int32_t value_int;

src/lib/parameters/param.h

@@ -260,6 +260,17 @@ __EXPORT void		param_notify_changes(void);
  */
 __EXPORT int		param_reset(param_t param);
 
+/**
+ * Reset a parameter to its default value, but do not notify the system about the change.
+ *
+ * This function frees any storage used by struct parameters, and returns the parameter
+ * to its default value.
+ *
+ * @param param		A handle returned by param_find or passed by param_foreach.
+ * @return		Zero on success, nonzero on failure
+ */
+__EXPORT int		param_reset_no_notification(param_t param);
+
 /**
  * Reset all parameters to their default values.
  *

src/lib/parameters/parameters.cpp

@@ -797,8 +797,7 @@ void param_set_used_internal(param_t param)
 		(1 << param_index % bits_per_allocation_unit);
 }
 
-int
-param_reset(param_t param)
+static int param_reset_internal(param_t param, bool notify = true)
 {
 	param_wbuf_s *s = nullptr;
 	bool param_found = false;
@@ -823,12 +822,16 @@ param_reset(param_t param)
 
 	param_unlock_writer();
 
-	if (s != nullptr) {
+	if (s != nullptr && notify) {
 		_param_notify_changes();
 	}
 
 	return (!param_found);
 }
+
+int param_reset(param_t param) { return param_reset_internal(param, true); }
+int param_reset_no_notification(param_t param) { return param_reset_internal(param, false); }
+
 static void
 param_reset_all_internal(bool auto_save)
 {