AP_Scripting: add binding and helper to get old params

libraries/AP_Scripting/AP_Scripting_helpers.cpp

@@ -12,6 +12,38 @@ bool Parameter::init(const char *name)
     return true;
 }
 
+// init by info, to get the value of old params
+bool Parameter::init_by_info(uint16_t key, uint32_t group_element, enum ap_var_type type)
+{
+    switch (type) {
+    case AP_PARAM_INT8:
+        vp = new AP_Int8;
+        break;
+    case AP_PARAM_INT16:
+        vp = new AP_Int16;
+        break;
+    case AP_PARAM_INT32:
+        vp = new AP_Int32;
+        break;
+    case AP_PARAM_FLOAT:
+        vp = new AP_Float;
+        break;
+    default:
+        return false;
+    }
+    if (vp == nullptr) {
+        return false;
+    }
+    vtype = type;
+    AP_Param::ConversionInfo info = {
+        key,
+        group_element,
+        type,
+        nullptr
+    };
+    return AP_Param::find_old_parameter(&info, vp);
+}
+
 // set a value
 bool Parameter::set(float value)
 {

libraries/AP_Scripting/AP_Scripting_helpers.h

@@ -10,6 +10,9 @@ public:
     // init to param by name
     bool init(const char *name);
 
+    // init by token, to get the value of old params
+    bool init_by_info(uint16_t key, uint32_t group_element, enum ap_var_type type);
+
     // setters and getters
     bool set(float value);
     bool set_and_save(float value);

libraries/AP_Scripting/docs/docs.lua

@@ -321,6 +321,17 @@ function Parameter_ud:set(value) end
 ---@return number|nil
 function Parameter_ud:get() end
 
+-- desc
+---@param key integer
+---@param group_element uint32_t_ud
+---@param type integer
+---| '1' # AP_PARAM_INT8
+---| '2' # AP_PARAM_INT16
+---| '3' # AP_PARAM_INT32
+---| '4' # AP_PARAM_FLOAT
+---@return boolean
+function Parameter_ud:init_by_info(key, group_element, type) end
+
 -- desc
 ---@param name string
 ---@return boolean

libraries/AP_Scripting/generator/description/bindings.desc

@@ -314,6 +314,7 @@ singleton AP_Param method add_param boolean uint8_t 0 200 uint8_t 1 63 string fl
 
 include AP_Scripting/AP_Scripting_helpers.h
 userdata Parameter method init boolean string
+userdata Parameter method init_by_info boolean uint16_t 0 UINT16_MAX uint32_t 0U UINT32_MAX ap_var_type'enum AP_PARAM_INT8 AP_PARAM_FLOAT
 userdata Parameter method get boolean float'Null
 userdata Parameter method set boolean float'skip_check
 userdata Parameter method set_and_save boolean float'skip_check