OpenThermCore.h

#ifndef __OPENTHERMCORE_H_
#define __OPENTHERMCORE_H_


// Messgae type definition
#define OT_MSG_TYPE_MS_READ       B000
#define OT_MSG_TYPE_MS_WRITE      B001
#define OT_MSG_TYPE_MS_INVALID    B010
#define OT_MSG_TYPE_SM_READ_ACK   B100
#define OT_MSG_TYPE_SM_WRITE_ACK  B101
#define OT_MSG_TYPE_SM_INVALID    B110
#define OT_MSG_TYPE_SM_UNK_DATAID B111

#define OT_OK                     0
#define OT_RESPONSE_TIMOUT        1
#define OT_PARITY_ERROR           2
#define OT_BAD_RESPONSE           3

// Opentherm bit period
#if !defined OT_BIT_PERIOD
  #define OT_BIT_PERIOD 990 //microseconds, 1ms -10%+15%
#endif

#include "Arduino.h"


class OpenThermCore {

  private:
    uint8_t _pin_in;
    uint8_t _pin_out;
    uint8_t _ot_err = OT_OK;
    
    void setIdleState();
    void setActiveState();
    void sendBit(bool high);
    void sendFrame(uint32_t request);
    bool waitForResponse();
    uint32_t readResponse();

    boolean testParity(uint32_t response);

  public:
    OpenThermCore(uint8_t pin_in, uint8_t pin_out );
        
    // setup pins
    void setupOT();
    
    void activateOT();
    
    // send request and read response    
    uint32_t sendRequest(uint32_t request);
    
    uint8_t getError();

    // print formated - DEBUG on Serial
    void printRequest(uint32_t request);
    void printResponse(uint32_t request);
    void printBinary(uint32_t val);
    
    // create Opentherm datagram from msgType, dataID and dataValue
    uint32_t makeOTDataBlock(uint8_t msgType, uint8_t dataID, uint16_t dataValue);

    // parse Opentherm datagram from msgType, dataID and dataValue
    uint8_t parseOTDataBlockMsgType(uint32_t response);
    uint8_t parseOTDataBlockDataID(uint32_t response);
    uint16_t parseOTDataBlockDataValue(uint32_t response);
    
    // convert float number to Opentherm coding
    int16_t floatToOT16 (float in);
    // convert Opentherm coding to float number 
    float OT16ToFloat (int16_t in);
    

};

#endif