adding the missing freemem code

zsalzbank · Feb 18, 2011 · 4cb8c01 · 4cb8c01
1 parent 437aa8a
commit 4cb8c01
Showing 1 changed file with 48 additions and 0 deletions.
diff --git a/Examples/test/test.pde b/Examples/test/test.pde
@@ -215,4 +215,52 @@ void printProgStr(const prog_char* str) {
   }
 }
 
+//Code to print out the free memory
+
+struct __freelist {
+  size_t sz;
+  struct __freelist *nx;
+};
+
+extern char * const __brkval;
+extern struct __freelist *__flp;
+
+uint16_t freeMem(uint16_t *biggest)
+{
+  char *brkval;
+  char *cp;
+  unsigned freeSpace;
+  struct __freelist *fp1, *fp2;
+
+  brkval = __brkval;
+  if (brkval == 0) {
+    brkval = __malloc_heap_start;
+  }
+  cp = __malloc_heap_end;
+  if (cp == 0) {
+    cp = ((char *)AVR_STACK_POINTER_REG) - __malloc_margin;
+  }
+  if (cp <= brkval) return 0;
+
+  freeSpace = cp - brkval;
+
+  for (*biggest = 0, fp1 = __flp, fp2 = 0;
+     fp1;
+     fp2 = fp1, fp1 = fp1->nx) {
+      if (fp1->sz > *biggest) *biggest = fp1->sz;
+    freeSpace += fp1->sz;
+  }
+
+  return freeSpace;
+}
+
+uint16_t biggest;
+
+void freeMem(char* message) {
+  Serial.print(message);
+  Serial.print(":\t");
+  Serial.println(freeMem(&biggest));
+}
+
+