Documentation updated

lib/Core/core.h

@@ -23,6 +23,12 @@
 #include <ModbusRTU.h>        // Or your specific Modbus RTU library
 #endif
 
+/**
+ * @defgroup ModbusCategoryCodes Modbus Point Category Codes
+ * @brief Integer constants used in the `modbusMap` to identify the type of Modbus point.
+ * These codes determine which `ModbusPoint` subclass is created by the factory.
+ * @{
+ */
 const int COIL = 0;         /**< @brief 0x: R/W Coil */
 const int DI = 1;           /**< @brief 1x: R Discrete Inputs */
 const int IR = 3;           /**< @brief 3x: R Input Register - Single word */
@@ -33,6 +39,7 @@ const int HR = 4;           /**< @brief 4x: R/W Holding Register - Single word *
 const int HR_10x = 41;      /**< @brief 4x: R/W Holding Register - Single word, 10x scaled */
 const int HR_LONG = 42;     /**< @brief 4x: R/W Holding Register - Double word, Long type */
 const int HR_FLOAT = 43;    /**< @brief 4x: R/W Holding Register - Double word, Float encoding */
+/** @} */
 
 /**
  * @struct modbusMap
@@ -47,10 +54,16 @@ struct modbusMap
 };
 
 /**
- * @brief The main loop previous milliseconds.
+ * @brief Timestamp for managing the main application loop interval.
+ * Used in the main `.cpp` file to control the frequency of the `EquipmentInstance.update()` call.
  */
 unsigned long previousMillis = 0;
 
+/**
+ * @defgroup GlobalInstances Global Instances
+ * @brief Globally accessible objects for the Modbus server and Equipment.
+ * @{
+ */
 /**
  * @brief Global Modbus object instance.
  * The type is determined at compile time based on the USE_MODBUS_IP flag.
@@ -64,6 +77,6 @@ extern ModbusRTU mb; // Use ModbusRTU class
 /** @brief An instance of the Equipment class, representing the emulated Equipment unit. */
 Equipment<ModbusRTU> EquipmentInstance(&mb);
 #endif
-
+/** @} */
 
 #endif // CORE_H