/*
 * meterBusClient.h
 *
 *  Created on: 08.03.2014
 *      Author: wn
 */

#ifndef METERBUSCLIENT_H_
#define METERBUSCLIENT_H_

#include "uptime.h"



const unsigned long RESPONSE_DELAY = 50;



struct MeterBusFrame {
 /*
  * Short Frame:
  *   Start      10h
  *   C-Field
  *   A-Field
  *   Check-Sum
  *   Stop       16h
  *
  * Long Frame:
  *   Start      68h
  *   Length
  *   Length
  *   Start      68h
  *   C-Field
  *   A-Field
  *   CI-Field
  *   User-Data
  *   Check-Sum
  *   Stop       16h
  *
  */
  unsigned char startDelimiter;
  unsigned char length;
  unsigned char cField;
  unsigned char aField;
  unsigned char ciField;
  unsigned char userData[64];
  unsigned char checksum;
  bool valid;
};


class MeterBusClient {
public:
  MeterBusClient();
  void begin(Uptime *uptime);
  void exec();
private:
  Uptime *m_uptime;

  unsigned char m_address;
  void setAddress(unsigned char address);
  unsigned char getAddress();
  bool handleFrame();
  MeterBusFrame m_frame;

  unsigned char m_sendBuffer[64];
  unsigned int m_sendBufferLen;
  void aSB(unsigned char v); // append to send buffer
  void aSB(unsigned int v);
  void aSB(unsigned long v);
  void aSB(float v);
  unsigned char calcSendChecksum();
  void calcAndSetFrameLength();

  unsigned long m_frameCnt;
  unsigned char m_accessCnt;
  unsigned long m_myFrameCnt;
  unsigned long m_invalidFrameCnt;
  unsigned long m_invalidChecksum;
  unsigned long m_collisionCnt;

  unsigned char getAccessCnt();
  unsigned char getStatus();

  void SND_NKE();
  void REQ_UD2();
  void SND_UD();
};



#endif /* METERBUSCLIENT_H_ */