File content as of revision 10:0df2cc66fc47:

/******************************************************************//**
* @file owgpio.h
*
* @author Justin Jordan
*
* @version 0.0.0
*
* Started: 31JAN16
*
* Updated: 
*
* @brief Header file for bit-banging a 1-wire master
***********************************************************************
* 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
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* 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,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
**********************************************************************/


#ifndef OWGPIO_H
#define OWGPIO_H


#if(TARGET_MAX32600)


#include "mbed.h"
#include "OneWireInterface.h"
#include "OneWireMastersShared.h"


class OwGpio: public OneWireInterface
{
    public:
    
    //1-wire timming constants for bit-bang. 
    //Bit-Bang Master only supported  on MAX32600MBED board
    //All times are in terms of micro seconds
    
    static const uint16_t TRSTL_STD = 560; 
    static const uint16_t TRSTL_OVD = 56; 
    
    //Master sample time for PD
    static const uint16_t TMSP_STD = 68; 
    static const uint16_t TMSP_OVD = 8; 
    
    //Write 0
    static const uint16_t TW0L_STD = 64;
    static const uint16_t TW0L_OVD = 8;
    
    //Write 1, Read low time
    static const uint16_t TW1L_STD = 8;
    static const uint16_t TW1L_OVD = 1;
    
    //Master sample time for bit
    static const uint16_t TMSR_STD = 12;
    static const uint16_t TMSR_OVD = 1;
    
    //make sure to use TSLOT for recoveries
    static const uint16_t TSLOT_STD = 70;
    static const uint16_t TSLOT_OVD = 10;
    
    
    /**********************************************************//**
    * @brief Owgpio constructor
    * 
    * @details Initializes given pin for open-drain operation
    *
    * On Entry:
    *
    * @para[in] ow_gpio - GPIO pin to use for One Wire bus
    *
    * @param[in] ext_spu - GPIO pin to use for Strong Pull-Up
    * 
    * On Exit:
    *
    * @return 
    **************************************************************/
    OwGpio(PinName ow_gpio, PinName ext_spu = NC);
    
    
    /**********************************************************//**
    * @brief OwGpio destructor 
    * 
    * @details
    *
    * On Entry:
    *
    * On Exit:
    *
    * @return 
    **************************************************************/
    virtual ~OwGpio();
    
    
    /**********************************************************//**
    * @brief initializes 16-bit counter_0 of TMR3 on MAX32600MBED 
    * 
    * @details 
    *
    * On Entry:
    *
    * On Exit:
    *
    * @return 
    **************************************************************/
    static void init_ow_timer(void);
    
    
    /***** OW API ****************************************************/
    virtual bool OWReset();
    
    virtual void OWWriteBit(uint8_t sendbit);
    
    virtual uint8_t OWReadBit();
    
    virtual uint8_t OWTouchBit(uint8_t sendbit);

    virtual bool OWWriteByte(uint8_t sendbyte);

    virtual uint8_t OWReadByte(void);

    virtual uint8_t OWTouchByte(uint8_t sendbyte);

    virtual void OWBlock(uint8_t *tran_buf, uint8_t tran_len);
    
    virtual void OWWriteBlock(const uint8_t *tran_buf, uint8_t tran_len);
    
    virtual void OWReadBlock(uint8_t *recv_buf, uint8_t recv_len);

    virtual bool OWFirst(void);

    virtual bool OWNext(void);

    virtual bool OWVerify(void);

    virtual void OWTargetSetup(uint8_t family_code);

    virtual void OWFamilySkipSetup(void);
    
    virtual bool OWSearch(void);
    
    virtual bool OWReadROM(void);
    
    virtual bool OWSkipROM(void);
    
    virtual bool OWMatchROM(void);
    
    virtual bool OWOverdriveSkipROM(void);
    
    virtual bool OWOverdriveMatchROM(void);
    
    virtual bool OWResume(void);

    virtual uint8_t OWSpeed(OW_SPEED new_speed);

    virtual uint8_t OWLevel(OW_LEVEL new_level);

    virtual bool OWWriteBytePower(uint8_t sendbyte);

    virtual bool OWReadBitPower(uint8_t applyPowerResponse);

    virtual const uint8_t (&OWgetROMnumber() const)[ROMnumberLen];
    
    private:
    
    void init_ow_gpio(PinName ow_gpio);
    
    DigitalOut _ext_spu;
    OW_SPEED _ow_speed;
    OW_LEVEL _ow_level;
    
    uint32_t _ow_port;
    uint32_t _ow_pin;
    
    // Search state
    uint8_t _rom_number[ROMnumberLen];
    uint8_t _last_discrepancy;
    uint8_t _last_family_discrepancy;
    uint8_t _last_device_flag;
    uint8_t _crc8;    
};

#endif/* TARGET_MAX32600*/
#endif /*OWGPIO_H*/