Revision 0:2b2aa11cebd7, committed 2011-05-04

Comitter:

networker

Date:

Wed May 04 09:14:02 2011 +0000

Commit message:

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AvailableMemory.cpp	Wed May 04 09:14:02 2011 +0000
@@ -0,0 +1,34 @@
+#include "AvailableMemory.h"
+#include <stdlib.h>
+
+namespace segundo {
+namespace Utilities {
+
+int AvailableMemory(int resolution, int maximum, bool disableInterrupts) {
+
+    if (resolution < 1) resolution = 1;
+    if (maximum < 0) maximum = 0;
+
+    int low = 0;
+    int high = maximum + 1;
+
+    if (disableInterrupts) __disable_irq();
+
+    while (high - low > resolution) {
+        int mid = (low + high) / 2;
+        void* p = malloc(mid);
+        if (p == NULL) {
+            high = mid;
+        } else {
+            free(p);
+            low = mid;
+        }
+    }
+
+    if (disableInterrupts) __enable_irq();
+
+    return low;
+}
+
+} // namespace Utilities
+} // namespace segundo
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AvailableMemory.h	Wed May 04 09:14:02 2011 +0000
@@ -0,0 +1,46 @@
+/** @file
+ * Return the memory available for a malloc call.
+ */
+#ifndef SEGUNDO_UTILITIES_AVAILABLEMEMORY_H
+#define SEGUNDO_UTILITIES_AVAILABLEMEMORY_H
+
+/**
+ * Segundo Equipo
+ */
+namespace segundo {
+/**
+ * A collection of utilities
+ */
+namespace Utilities {
+
+/** Return the memory available for a malloc call.
+ * This is done by a binary search approach
+ * calling malloc/free starting with a maximum.
+ *
+ * Example:
+ * @code
+ * #include <stdio.h>
+ * #include "AvailableMemory.h"
+ *
+ * int main() {
+ *
+ *     printf("Available memory (bytes to nearest 256) : %d\n", AvailableMemory());
+ *     printf("Available memory (exact bytes) : %d\n", AvailableMemory(1));
+ *
+ * }
+ * @endcode
+ * @param resolution Resolution in number of bytes,
+ * 1 will return the exact value,
+ * default will return the available memory to the nearest 256 bytes
+ * @param maximum Maximum amount of memory to check, default is 32K (0x8000)
+ * @param disableInterrupts Disable interrupts whilst checking, default is true
+ * @return Available memory in bytes accurate to within resolution
+ */
+int AvailableMemory(int resolution = 256, int maximum = 0x8000, bool disableInterrupts = true);
+
+} // namespace Utilities
+} // namespace segundo
+
+using namespace segundo::Utilities;
+
+#endif // SEGUNDO_UTILITIES_AVAILABLEMEMORY_H
\ No newline at end of file