AP_Param_Helper: param table support for HAL

this allows a HAL to have its own parameter table with parameter names
generated by the build system

libraries/AP_Param_Helper/AP_Param_Helper.cpp

@@ -0,0 +1,28 @@
+#include "AP_Param_Helper.h"
+
+#include <AP_HAL/AP_HAL.h>
+
+#if defined(HAL_NEEDS_PARAM_HELPER)
+
+const AP_Param::GroupInfo AP_Param_Helper::var_info[] = {
+// only if board defines parameters
+#ifdef BOARD_HAL_VARINFO
+    BOARD_HAL_VARINFO,
+#endif
+    AP_GROUPEND
+};
+
+
+extern const AP_HAL::HAL& hal;
+
+AP_Param_Helper::AP_Param_Helper(bool f){
+    f=!f;
+
+    hal_param_helper=this;
+    AP_Param::setup_object_defaults(this, var_info); // setup all params
+}
+
+
+AP_Param_Helper * hal_param_helper;
+
+#endif

libraries/AP_Param_Helper/AP_Param_Helper.h

@@ -0,0 +1,29 @@
+/*
+    a helper class to give ability to HAL to have own parameters
+
+*/
+#pragma once
+
+#include <AP_HAL/AP_HAL.h>
+
+#if defined(HAL_NEEDS_PARAM_HELPER)
+#include <AP_Param/AP_Param.h>
+
+class AP_Param_Helper
+{
+public:
+    AP_Param_Helper(bool f);
+
+    static const AP_Param::GroupInfo var_info[];
+
+// only if defined
+#ifdef BOARD_HAL_PARAMS
+    BOARD_HAL_PARAMS
+#endif
+
+};
+
+
+extern AP_Param_Helper * hal_param_helper;
+
+#endif