#define BUFFER_SIZE 96

//受信バッファ
class ReceiveBufferClass
{
  uint8_t dataBuffer[BUFFER_SIZE];
  uint8_t head, tail;
  uint8_t byteData;
  bool exist;

public:
  ReceiveBufferClass();
  bool dataExist() { return exist; };
  void setData(int8_t dat);
  uint8_t getData();
  void clearBuffer();
};

ReceiveBufferClass::ReceiveBufferClass()
{
  head = 0;
  tail = 0;
  exist = false;
}

void ReceiveBufferClass::setData(int8_t dat)
{
  uint8_t p;

  p = tail;
  dataBuffer[p++] = dat;
  if(p == BUFFER_SIZE)
    p = 0;
  if(p != head)
    tail = p;

  exist = true;
}

uint8_t ReceiveBufferClass::getData()
{
  if(!exist)
    return 0xFF;

  byteData = dataBuffer[head++];
  if(head == BUFFER_SIZE)
    head = 0;
  if(head == tail)
    exist = false;

  return byteData;
}

void ReceiveBufferClass::clearBuffer()
{
  head = 0;
  tail = 0;
  exist = false;
}