From 4f09799ebf9b68f8a91546bdb03db44aaadc7b4c Mon Sep 17 00:00:00 2001
From: Jon Langseth <jon.langseth@lilug.no>
Date: Wed, 7 Sep 2011 22:43:47 +0200
Subject: [PATCH] Added FreeRam function, borrowed from the FAT16lib.

---
 source/RCTXDuino/RCTXDuino.pde | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/source/RCTXDuino/RCTXDuino.pde b/source/RCTXDuino/RCTXDuino.pde
index ebe62ad..0c63499 100644
--- a/source/RCTXDuino/RCTXDuino.pde
+++ b/source/RCTXDuino/RCTXDuino.pde
@@ -696,6 +696,7 @@ void ISR_timer(void)
   }
 }
 
+
 #ifdef DEBUG
 void serial_debug()
 {
@@ -720,6 +721,8 @@ void serial_debug()
   Serial.print("Average loop time:");
   Serial.println(avg_loop_time);
 
+  Serial.print("Free RAM:");
+  Serial.print( FreeRam() );
   Serial.println();
 }
 #endif
@@ -1089,6 +1092,33 @@ void ui_handler()
   return;
 }
 
+#ifdef DEBUG
+/* The following code is taken from the 
+   Arduino FAT16 Library by William Greiman 
+   The code may or may-not survive in the long run,
+   depending on what licensing-terms we decide on.
+   The license will be open source, but the FAT16lib
+   is GPL v3, and I (fishy) am personally not so sure about that... 
+   
+   On the other hand... This code is a very "intuitive approach",
+   so contacting the author may give us the option of relicencing just this bit...
+*/
+static int FreeRam(void) {
+  extern int  __bss_end;
+  extern int* __brkval;
+  int free_memory;
+  if (reinterpret_cast<int>(__brkval) == 0) {
+    // if no heap use from end of bss section
+    free_memory = reinterpret_cast<int>(&free_memory)
+                  - reinterpret_cast<int>(&__bss_end);
+  } else {
+    // use from top of stack to heap
+    free_memory = reinterpret_cast<int>(&free_memory)
+                  - reinterpret_cast<int>(__brkval);
+  }
+  return free_memory;
+}
+#endif
 
 
 
-- 
2.39.2