Replace broad include file <Arduino.h> with only the required include files, inline functions to prevent linker errors, and define static constants so that the compiler can place them in memory. All of those changes broaden adoption.

Author: aentinger

api/CanMsg.cpp

@@ -0,0 +1,34 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of either the GNU General Public License version 2
+ * or the GNU Lesser General Public License version 2.1, both as
+ * published by the Free Software Foundation.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include "CanMsg.h"
+
+/**************************************************************************************
+ * NAMESPACE
+ **************************************************************************************/
+
+namespace arduino
+{
+
+/**************************************************************************************
+ * STATIC CONST DEFINITION
+ **************************************************************************************/
+
+size_t   const CanMsg::MAX_DATA_LENGTH;
+uint32_t const CanMsg::CAN_EFF_FLAG;
+uint32_t const CanMsg::CAN_SFF_MASK;
+uint32_t const CanMsg::CAN_EFF_MASK;
+
+/**************************************************************************************
+ * NAMESPACE
+ **************************************************************************************/
+
+} /* arduino */

api/CanMsg.h

@@ -15,7 +15,9 @@
 #include <stdint.h>
 #include <string.h>
 
-#include <Arduino.h>
+#include "Print.h"
+#include "Printable.h"
+#include "Common.h"
 
 /**************************************************************************************
  * NAMESPACE
@@ -112,20 +114,20 @@ class CanMsg : public Printable
    * |- Bit   29 : reserved (future error frame flag)
    * |- Bit 0-28 : CAN identifier (11/29 bit)
    */
-  uint32_t id;
-  uint8_t  data_length;
-  uint8_t  data[MAX_DATA_LENGTH];
+  private: uint32_t id;
+  public:  uint8_t  data_length;
+  public:  uint8_t  data[MAX_DATA_LENGTH];
 };
 
 /**************************************************************************************
  * FREE FUNCTIONS
  **************************************************************************************/
 
-static uint32_t CanStandardId(uint32_t const id) {
+inline uint32_t CanStandardId(uint32_t const id) {
   return (id & CanMsg::CAN_SFF_MASK);
 }
 
-static uint32_t CanExtendedId(uint32_t const id) {
+inline uint32_t CanExtendedId(uint32_t const id) {
   return (CanMsg::CAN_EFF_FLAG | (id & CanMsg::CAN_EFF_MASK));
 }