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/******************************************************************//**
* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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**********************************************************************/


#ifndef DS2480B_H
#define DS2480B_H


#include "mbed.h"
#include "OneWire_Masters/OneWireMaster.h"


class Ds2480b: public OneWireMaster
{
    public:
    
    enum DS2480B_BPS
    {
        BPS_9600 = 0,
        BPS_19200 = 2,
        BPS_57600 = 4,
        BPS_115200 = 6
    };
        
    /**********************************************************//**
    * @brief Ds2480b constructor
    * 
    * @details allows user to use existing Serial object
    *
    * On Entry:
    *     @param[in] p_serial - pointer to existing serial object
    *
    * On Exit:
    *    @return 
    **************************************************************/
    Ds2480b(Serial &p_serial);
    
    
    /**********************************************************//**
    * @brief Ds2480b constructor
    * 
    * @details Object instantiates a new serial object with no 
    *          public access
    *
    * On Entry:
    *     @param[in] tx - tx pin of uart to be used
    *     @param[in] rx - rx pin of uart to be used
    *     @param[in] baud - baudrate for uart
    *
    * On Exit:
    *    @return 
    **************************************************************/
    Ds2480b(PinName tx, PinName rx);
    
    
    /**********************************************************//**
    * @brief Ds2480b destructor 
    * 
    * @details deletes serial object if owner 
    *
    * On Entry:
    *
    * On Exit:
    *    @return 
    **************************************************************/
    virtual ~Ds2480b();
    
    OneWireMaster::CmdResult DS2480B_ChangeBaud(DS2480B_BPS newbaud);
    
    
    //Part of OneWireMaster that should be implemented for each master
    //See OneWireMaster.h for documentation
    
    virtual OneWireMaster::CmdResult OWInitMaster(void);
    
    virtual OneWireMaster::CmdResult OWReset(void);
    
    virtual OneWireMaster::CmdResult OWTouchBit(uint8_t & sendrecvbit, OWLevel after_level);

    virtual OneWireMaster::CmdResult OWWriteByte(uint8_t sendbyte, OWLevel after_level);

    virtual OneWireMaster::CmdResult OWReadByte(uint8_t & recvbyte, OWLevel after_level);

    virtual OneWireMaster::CmdResult OWSetSpeed(OWSpeed new_speed);

    virtual OneWireMaster::CmdResult OWSetLevel(OWLevel new_level);
    
    private:
    
    void rx_callback(void);
    
    OneWireMaster::CmdResult DS2480B_Detect(void);
    OneWireMaster::CmdResult WriteCOM(uint32_t outlen, uint8_t *outbuf);
    OneWireMaster::CmdResult ReadCOM(uint32_t inlen, uint8_t *inbuf);
    void BreakCOM(void);
    void FlushCOM(void);
    void SetBaudCOM(uint8_t new_baud);
    int32_t bitacc(uint32_t op, uint32_t state, uint32_t loc, uint8_t *buf);
    
    Serial *_p_serial;
    bool _serial_owner;
    
    // DS2480B state
    OWLevel _ULevel; // 1-Wire level
    DS2480B_BPS _UBaud;  // baud rate
    uint8_t _UMode;  // command or data mode state
    uint8_t _USpeed; // 1-Wire communication speed
    
    static const size_t MAX_RX_BUFFER_LEN = 256;
    volatile struct ds2480b_circular_buff_s
    {
        uint8_t w_idx;
        uint8_t r_idx;
        uint8_t rx_bytes_available;
        bool wrap_error;
        uint8_t buff[MAX_RX_BUFFER_LEN];
    }rx_buffer;
};

#endif /*DS2480B_H*/