Add N2kStream interface for reading- and writing serial data. On Ardu…

…ino this defaults to Stream.

N2kStream.cpp

@@ -0,0 +1,24 @@
+#include "N2kStream.h"
+#include <string.h>
+#include <stdlib.h>
+
+#ifdef ARDUINO
+// Arduino uses its own implementation.
+#else
+size_t N2kStream::print(const char *str) {
+   if(str == 0)
+      return 0;
+
+   return write(reinterpret_cast<const uint8_t*>(str), strlen(str));
+}
+
+size_t N2kStream::print(int val) {
+   char buf[16];
+   return write(itoa(buf, val, 10), strlen(buf));
+}
+
+size_t N2kStream::println(const char *str) {
+   return print(str) + print("\r\n");
+}
+
+#endif

N2kStream.h

@@ -0,0 +1,61 @@
+/*
+N2kStream.h
+
+Copyright (c) 2015-2016 Timo Lappalainen, Kave Oy, www.kave.fi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+I/O stream used in the NMEA2000 libraries.
+
+*/
+
+#ifndef _tN2kStream_H_
+#define _tN2kStream_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+#ifdef ARDUINO
+// Arduino users get away with using the standard Stream class and its
+// subclasses. Forward declare the Stream class here and include Arduino.h in
+// the application.
+#include <Arduino.h>
+typedef Stream N2kStream;
+#else
+// Non Arduino platforms need to implement this themselves if they want to use
+// functions which operate on streams.
+class N2kStream {
+   public:
+   // Returns first byte if incoming data, or -1 on no available data.
+   virtual int read() = 0;
+
+   // Write data to stream.
+   virtual size_t write(const uint8_t* data, size_t size) = 0;
+
+   // Print string to stream.
+   size_t print(const char* str);
+
+   // Print value to stream.
+   size_t print(int val);
+
+   // Print string and newline to stream.
+   size_t println(const char *str);
+};
+#endif
+
+#endif