Implementation of 1-Wire with added Alarm Search Functionality

Dependents:   Max32630_One_Wire_Interface

OneWire_Masters/DS248x/ds248x.h

Committer:
j3
Date:
2016-03-21
Revision:
23:e8e403d61359
Parent:
21:00c94aeb533e
Child:
24:8942d8478d68

File content as of revision 23:e8e403d61359:

/******************************************************************//**
* 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"),
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* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
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*
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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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
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**********************************************************************/


#ifndef DS248X_H
#define DS248X_H


#include "mbed.h"
#include "OneWireMaster.h"


class Ds248x: public OneWireMaster
{
    public:
    
    enum DS248X_I2C_ADRS
    {
        DS248X_I2C_ADRS0 = 0x18,
        DS248X_I2C_ADRS1,
        DS248X_I2C_ADRS2,
        DS248X_I2C_ADRS3,
        DS248X_I2C_ADRS4,
        DS248X_I2C_ADRS5,
        DS248X_I2C_ADRS6,
        DS248X_I2C_ADRS7
    };
    
    enum DS248X_CMDS
    {
        CMD_DRST = 0xF0,
        CMD_WCFG = 0xD2,
        CMD_A1WP = 0xC3, //DS2484 only
        CMD_CHSL = 0xC3, //DS2482-800 only
        CMD_SRP = 0xE1,
        CMD_1WRS = 0xB4,
        CMD_1WWB = 0xA5,
        CMD_1WRB = 0x96,
        CMD_1WSB = 0x87,
        CMD_1WT = 0x78
    };
    
    enum DS248X_CONFIG_BITS
    {
        CONFIG_APU = 0x01,
        CONFIG_PDN = 0x02,
        CONFIG_SPU = 0x04,
        CONFIG_1WS = 0x08
    };

    enum DS248X_STATUS_BITS
    {
        STATUS_1WB  = 0x01,
        STATUS_PPD = 0x02,
        STATUS_SD = 0x04,
        STATUS_LL = 0x08,
        STATUS_RST = 0x10,
        STATUS_SBR = 0x20,
        STATUS_TSB = 0x40,
        STATUS_DIR = 0x80
    };
    
    enum DS2484_ADJST_PARAMS
    {
        TRSTL = 0,
        TRSTL_OD,
        TMSP,
        TMSP_OD,
        TW0L,
        TW0L_OD,
        TREC0, //OD NA
        RWPU = 8 //OD NA, see DS2484 datasheet page 13
    };
    
    enum SEARCH_DIRECTION
    {
        DIRECTION_WRITE_ZERO = 0,
        DIRECTION_WRITE_ONE = 1
    };

    static const size_t POLL_LIMIT = 200;
    
    static const int I2C_WRITE_OK = 0;
    
    static const int I2C_READ_OK = 0;
    
    
    /**********************************************************//**
    * @brief Ds248x constructor
    * 
    * @details allows user to use existing I2C object
    *
    * On Entry:
    *     @param[in] p_i2c_bus - pointer to existing I2C object
    *
    * On Exit:
    *    @return 
    **************************************************************/
    Ds248x(I2C &i2c_bus, DS248X_I2C_ADRS adrs);
    
    
    /**********************************************************//**
    * @brief Ds248x constructor
    * 
    * @details Object instantiates a new I2C object with no 
    *          public access
    *
    * On Entry:
    *     @param[in] sda - sda pin of I2C bus
    *     @param[in] scl - scl pin of I2C bus
    *
    * On Exit:
    *    @return 
    **************************************************************/
    Ds248x(PinName sda, PinName scl, DS248X_I2C_ADRS adrs);
    
    
    /**********************************************************//**
    * @brief Ds248x destructor 
    * 
    * @details deletes I2C object if owner 
    *
    * On Entry:
    *
    * On Exit:
    *    @return 
    **************************************************************/
    virtual ~Ds248x();
    
    
    /**********************************************************//**
    * @brief detect() 
    * 
    * @details Detect routine that performs a device reset 
    *          followed by writing the configuration byte to default 
    *          values:
    *          1-Wire speed (c1WS) = standard (0)
    *          Strong pull-up (cSPU) = off (0)
    *          Presence pulse masking (cPPM) = off (0)
    *          Active pull-up (cAPU) = on (CONFIG_APU = 0x01)
    *
    * On Entry:
    *
    * On Exit:
    *    @return TRUE if device was detected and written
    *            FALSE device not detected or failure to write 
    *            configuration byte
    **************************************************************/
    OneWireMaster::CmdResult detect(void);
    
    
    /**********************************************************//**
    * @brief reset()
    * 
    * @details Perform a device reset on the Ds248x
    *
    * On Entry:
    *
    * On Exit:
    *    @return TRUE if device was reset
    *            FALSE device not detected or failure to perform reset
    **************************************************************/
    OneWireMaster::CmdResult reset(void);
    
    
    /**********************************************************//**
    * @brief write_config()
    * 
    * @details Write the configuration register in the Ds248x. The 
    *          configuration options are provided in the lower nibble 
    *          of the provided config byte. The uppper nibble is 
    *          bitwise inverted when written to the Ds248x.
    *
    * On Entry:
    *     @param[in] config - lower nib of configuration register
    *
    * On Exit:
    *    @return TRUE: config written and response correct
    *            FALSE: response incorrect
    **************************************************************/
    OneWireMaster::CmdResult write_config(uint8_t config);
    
    
    /**********************************************************//**
    * @brief channel_select()
    * 
    * @details Select the 1-Wire channel on a DS2482-800. 
    *          Min channel = 1
    *
    * On Entry:
    *     @param[in] channel - desired channel of the DS2482
    *
    * On Exit:
    *    @return TRUE if channel selected
    *            FALSE device not detected or failure to perform select
    **************************************************************/
    OneWireMaster::CmdResult channel_select(uint8_t channel);
    
    
    /**********************************************************//**
    * @brief adjust_timing()
    * 
    * @details adjustable timming available in DS2484 only
    *
    * On Entry:
    *     @param[in] param - 1 of 8 adjustable parameters
    *     @param[in] val - new value for parameter, see datasheet 
    *                      for codes
    *
    * On Exit:
    *    @return TRUE: parameter successfully adjusted
    *            FALSE: failed to adjust parameter
    **************************************************************/
    OneWireMaster::CmdResult adjust_timing(uint8_t param, uint8_t val);
    
    
    /**********************************************************//**
    * @brief search_triplet()
    * 
    * @details Use the Ds248x help command '1-Wire triplet' to perform 
    *          one bit of a 1-Wire search. This command does two read 
    *          bits and one write bit. The write bit is either the 
    *          default direction (all device have same bit) or in case 
    *          of a discrepancy, the 'search_direction' parameter is 
    *          used. 
    *
    * On Entry:
    *     @param[in] search_direction
    *
    * On Exit:
    *    @return The Ds248x status byte result from the triplet command
    **************************************************************/
    OneWireMaster::CmdResult search_triplet(uint8_t search_direction, uint8_t & status);
    
    
    //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);

    virtual OneWireMaster::CmdResult OWWriteByte(uint8_t sendbyte);

    virtual OneWireMaster::CmdResult OWReadByte(uint8_t & recvbyte);
    
    virtual OneWireMaster::CmdResult OWWriteBlock(const uint8_t *tran_buf, uint8_t tran_len);
    
    virtual OneWireMaster::CmdResult OWReadBlock(uint8_t *rx_buf, uint8_t rx_len);
    
    virtual OneWireMaster::CmdResult OWSearch(RomId & romId);

    virtual OneWireMaster::CmdResult OWSpeed(OW_SPEED new_speed);

    virtual OneWireMaster::CmdResult OWLevel(OW_LEVEL new_level);

    virtual OneWireMaster::CmdResult OWWriteBytePower(uint8_t sendbyte);

    virtual OneWireMaster::CmdResult OWReadBitPower(uint8_t applyPowerResponse);
    
    virtual OneWireMaster::CmdResult OWReadBytePower(uint8_t & recvbyte);
    
    private:
    
    //private fx for initializing _w_adrs and _r_adrs
    void set_i2c_adrs(DS248X_I2C_ADRS adrs);
    
    I2C *_p_i2c_bus;
    uint8_t _w_adrs, _r_adrs;
    bool _i2c_owner;
    
    // ds248x state
    uint8_t _short_detected;
    uint8_t _c1WS, _cSPU, _cPDN, _cAPU;   
};

#endif /*DS248X_H*/