#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