Updated memory storage functionality

- cachedStorage is functional
- Presets can be loaded from FLASH
- CRC32 added and applied
- Presets with corrputed data will be replaced by default preset

Next: Preset update functionality from menu 

git-svn-id: https://svn.vbchaos.nl/svn/hsb/trunk@269 05563f52-14a8-4384-a975-3d1654cca0fa

S - Software/0 - HSB MRTS Kathode-MCP/3 - Implementation/0 - Code/HAL/src/crc32.c

@@ -0,0 +1,68 @@
+// -----------------------------------------------------------------------------
+/// @file  crc32.c
+/// @brief Description
+// -----------------------------------------------------------------------------
+//  Micro-Key bv
+//  Industrieweg 28, 9804 TG Noordhorn
+//  Postbus 92, 9800 AB Zuidhorn
+//  The Netherlands
+//  Tel: +31 594 503020
+//  Fax: +31 594 505825
+//  Email: support@microkey.nl
+//  Web: www.microkey.nl
+// -----------------------------------------------------------------------------
+/// $Revision$
+/// $Author$
+/// $Date$
+//  (c) 2017 Micro-Key bv
+// -----------------------------------------------------------------------------
+
+/// @file crc32.c
+/// @ingroup {group_name}
+
+
+// -----------------------------------------------------------------------------
+// Include files
+// -----------------------------------------------------------------------------
+
+#include "crc32.h"
+
+// -----------------------------------------------------------------------------
+// Constant and macro definitions
+// -----------------------------------------------------------------------------
+
+
+
+// -----------------------------------------------------------------------------
+// Type definitions
+// -----------------------------------------------------------------------------
+
+
+// -----------------------------------------------------------------------------
+// File-scope variables
+// -----------------------------------------------------------------------------
+
+
+
+// -----------------------------------------------------------------------------
+// Function declarations
+// -----------------------------------------------------------------------------
+
+
+
+// -----------------------------------------------------------------------------
+// Function definitions
+// -----------------------------------------------------------------------------
+
+uint32_t crc32_calculate(uint32_t crc, const void* buffer, size_t size)
+{
+   const uint8_t *p;
+
+   p = buffer;
+   crc = crc ^ ~0U;
+
+   while (size--)
+      crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
+
+   return crc ^ ~0U;
+}