From 96f4db32924d826f2e5db7901e45cb550cd829b1 Mon Sep 17 00:00:00 2001
From: Mike Beattie <mike@ethernal.org>
Date: Fri, 23 Mar 2012 08:20:37 +1300
Subject: Add MemoryFree library

Signed-off-by: Mike Beattie <mike@ethernal.org>
---
 MemoryFree/MemoryFree.c | 26 ++++++++++++++++++++++++++
 MemoryFree/MemoryFree.h | 17 +++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 MemoryFree/MemoryFree.c
 create mode 100644 MemoryFree/MemoryFree.h

diff --git a/MemoryFree/MemoryFree.c b/MemoryFree/MemoryFree.c
new file mode 100644
index 0000000..8f7e91e
--- /dev/null
+++ b/MemoryFree/MemoryFree.c
@@ -0,0 +1,26 @@
+/*
+ * MemoryFree.c
+ * returns the number of free RAM bytes
+ */
+
+#include "Arduino.h"  
+#include "MemoryFree.h"
+
+extern unsigned int __data_start;
+extern unsigned int __data_end;
+extern unsigned int __bss_start;
+extern unsigned int __bss_end;
+extern unsigned int __heap_start;
+extern void *__brkval;
+
+
+int freeMemory() {
+  int free_memory;
+
+  if((int)__brkval == 0)
+     free_memory = ((int)&free_memory) - ((int)&__bss_end);
+  else
+    free_memory = ((int)&free_memory) - ((int)__brkval);
+
+  return free_memory;
+}
diff --git a/MemoryFree/MemoryFree.h b/MemoryFree/MemoryFree.h
new file mode 100644
index 0000000..ca79231
--- /dev/null
+++ b/MemoryFree/MemoryFree.h
@@ -0,0 +1,17 @@
+// memoryFree header
+
+#ifndef	MEMORY_FREE_H
+#define MEMORY_FREE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int freeMemory();
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif
+ 
-- 
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