Rover: add support for ParametersG2

APMrover2/Parameters.cpp

@@ -554,9 +554,23 @@ const AP_Param::Info Rover::var_info[] = {
     // @Path: ../libraries/AP_Button/AP_Button.cpp
     GOBJECT(button, "BTN_",  AP_Button),
 
+    // @Group:
+    // @Path: Parameters.cpp
+    GOBJECT(g2, "",  ParametersG2),
+
 	AP_VAREND
 };
 
+/*
+  2nd group of parameters
+ */
+const AP_Param::GroupInfo ParametersG2::var_info[] = {
+
+    AP_GROUPEND
+};
+
+
+
 /*
   This is a conversion table from old parameter values to new
   parameter names. The startup code looks for saved values of the old

APMrover2/Parameters.h

@@ -85,6 +85,7 @@ public:
         k_param_mission, // mission library
         k_param_NavEKF2_old, // deprecated
         k_param_NavEKF2,
+        k_param_g2, // 2nd block of parameters
 
         // 140: battery controls
         k_param_battery_monitoring = 140,   // deprecated, can be deleted
@@ -320,4 +321,17 @@ public:
         {}
 };
 
+/*
+  2nd block of parameters, to avoid going past 256 top level keys
+ */
+class ParametersG2 {
+public:
+    ParametersG2(void) { AP_Param::setup_object_defaults(this, var_info); }
+
+    // var_info for holding Parameter information
+    static const struct AP_Param::GroupInfo var_info[];
+
+};
+
+
 extern const AP_Param::Info var_info[];

APMrover2/Rover.h

@@ -109,6 +109,7 @@ private:
 
     // all settable parameters
     Parameters g;
+    ParametersG2 g2;
 
     // main loop scheduler
     AP_Scheduler scheduler;