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bitlair_doorduino/Entropy.h

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+// Entropy - A entropy (random number) generator for the Arduino
+//
+// Copyright 2014 by Walter Anderson
+//
+// This file is part of Entropy, an Arduino library.
+// Entropy is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Entropy is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Entropy.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef Entropy_h
+#define Entropy_h
+
+#include <stdint.h>
+
+// Separate the ARM Due headers we use
+#ifdef ARDUINO_SAM_DUE
+#include <sam.h>
+#include <sam3xa/include/component/component_trng.h>
+#endif
+
+// Teensy required headers
+#ifdef TEENSYDUINO
+#include <util/atomic.h>
+#endif
+
+//  Separate AVR headers from ARM headers
+#ifdef __AVR__  
+#include <avr/interrupt.h>
+#include <avr/wdt.h>
+#include <util/atomic.h>
+#endif
+
+const uint32_t WDT_RETURN_BYTE=256;
+const uint32_t WDT_RETURN_WORD=65536;
+
+union ENTROPY_LONG_WORD 
+{
+  uint32_t int32;
+  uint16_t int16[2];
+  uint8_t int8[4];
+};
+
+class EntropyClass
+{
+public:
+  void initialize(void);
+  uint32_t random(void);
+  uint32_t random(uint32_t max);
+  uint32_t random(uint32_t min, uint32_t max);
+  uint8_t randomByte(void);
+  uint16_t randomWord(void);
+  float randomf(void);
+  float randomf(float max);
+  float randomf(float min, float max);
+  float rnorm(float mean, float stdDev);
+  uint8_t available(void);
+ private:
+  ENTROPY_LONG_WORD share_entropy;
+  uint32_t retVal;
+  uint8_t random8(void);
+  uint16_t random16(void);
+};
+extern EntropyClass Entropy;
+#endif