File content as of revision 26:e2049a15fb15:

/**
 ******************************************************************************
 * @file    l6474_class.h
 * @author  Davide Aliprandi, STMicroelectronics
 * @version V1.0.0
 * @date    October 14th, 2015
 * @brief   This file contains the class of an L6474 Motor Control component.
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *   3. Neither the name of STMicroelectronics nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************
 */


/* Generated with STM32CubeTOO -----------------------------------------------*/


/* Revision ------------------------------------------------------------------*/
/*
    Repository:       http://svn.x-nucleodev.codex.cro.st.com/svnroot/X-NucleoDev
    Branch/Trunk/Tag: trunk
    Based on:         X-CUBE-SPN1/trunk/Drivers/BSP/Components/l6474/l6474.h
    Revision:         0
*/


/* Define to prevent recursive inclusion -------------------------------------*/

#ifndef __L6474_CLASS_H
#define __L6474_CLASS_H


/* Includes ------------------------------------------------------------------*/

/* ACTION 1 ------------------------------------------------------------------*
 * Include here platform specific header files.                               *
 *----------------------------------------------------------------------------*/        
#include "mbed.h"
#include "DevSPI.h"
/* ACTION 2 ------------------------------------------------------------------*
 * Include here component specific header files.                              *
 *----------------------------------------------------------------------------*/        
#include "l6474.h"
/* ACTION 3 ------------------------------------------------------------------*
 * Include here interface specific header files.                              *
 *                                                                            *
 * Example:                                                                   *
 *   #include "../Interfaces/Humidity_class.h"                                *
 *   #include "../Interfaces/Temperature_class.h"                             *
 *----------------------------------------------------------------------------*/
#include "../Interfaces/StepperMotor_class.h"


/* Classes -------------------------------------------------------------------*/

/**
 * @brief Class representing an L6474 component.
 */
class L6474 : public StepperMotor
{
public:

    /*** Constructor and Destructor Methods ***/

    /**
     * @brief Constructor.
     * @param flag_irq      pin name of the FLAG pin of the component.
     * @param standby_reset pin name of the STBY\RST pin of the component.
     * @param direction     pin name of the DIR pin of the component.
     * @param pwm           pin name of the PWM pin of the component.
     * @param ssel          pin name of the SSEL pin of the SPI device to be used for communication.
     * @param spi           SPI device to be used for communication.
     */
    L6474(PinName flag_irq, PinName standby_reset, PinName direction, PinName pwm, PinName ssel, DevSPI &spi) : StepperMotor(), flag_irq(flag_irq), standby_reset(standby_reset), direction(direction), pwm(pwm), ssel(ssel), dev_spi(spi)
    {
        /* Checking stackability. */
        if (!(number_of_devices < MAX_NUMBER_OF_DEVICES))
            error("Instantiation of the L6474 component failed: it can be stacked up to %d times.\r\n", MAX_NUMBER_OF_DEVICES);

        /* ACTION 4 ----------------------------------------------------------*
         * Initialize here the component's member variables, one variable per *
         * line.                                                              *
         *                                                                    *
         * Example:                                                           *
         *   measure = 0;                                                     *
         *   instance_id = number_of_instances++;                             *
         *--------------------------------------------------------------------*/
        error_handler_callback = 0;
        device_instance = number_of_devices++;
        memset(spi_tx_bursts, 0, L6474_CMD_ARG_MAX_NB_BYTES * MAX_NUMBER_OF_DEVICES * sizeof(uint8_t));
        memset(spi_rx_bursts, 0, L6474_CMD_ARG_MAX_NB_BYTES * MAX_NUMBER_OF_DEVICES * sizeof(uint8_t));
    }
    
    /**
     * @brief Destructor.
     */
    virtual ~L6474(void) {}
    

    /*** Public Component Related Methods ***/

    /* ACTION 5 --------------------------------------------------------------*
     * Implement here the component's public methods, as wrappers of the C    *
     * component's functions.                                                 *
     * They should be:                                                        *
     *   + Methods with the same name of the C component's virtual table's    *
     *     functions (1);                                                     *
     *   + Methods with the same name of the C component's extended virtual   *
     *     table's functions, if any (2).                                     *
     *                                                                        *
     * Example:                                                               *
     *   virtual int GetValue(float *pData) //(1)                             *
     *   {                                                                    *
     *     return COMPONENT_GetValue(float *pfData);                          *
     *   }                                                                    *
     *                                                                        *
     *   virtual int EnableFeature(void) //(2)                                *
     *   {                                                                    *
     *     return COMPONENT_EnableFeature();                                  *
     *   }                                                                    *
     *------------------------------------------------------------------------*/
    /**
     * @brief  Initializing the component in 1/16 Microstepping mode.
     * @param  init Pointer to device specific initalization structure.
     * @retval "0" in case of success, an error code otherwise.
     */
    virtual int Init(void *init = NULL)
    {
        return (int) L6474_Init((void *) init);
    }

    /**
     * @brief  Getting the ID of the component.
     * @param  id Pointer to an allocated variable to store the ID into.
     * @retval "0" in case of success, an error code otherwise.
     */
    virtual int ReadID(uint8_t *id = NULL)
    {
        return (int) L6474_ReadID((uint8_t *) id);
    }

    /**
     * @brief  Getting the value of the Status Register.
     * @param  None.
     * @retval None.
     * @note   The Status Register's flags are cleared, contrary to ReadStatusRegister().
     */
    virtual unsigned int GetStatus(void)
    {
        return (unsigned int) L6474_CmdGetStatus();
    }

   /**
     * @brief  Getting a parameter.
     * @param  parameter A parameter's register adress.
     * @retval The parameter's value.
     * @note   The Status Register's flags are cleared, contrary to ReadStatusRegister().
     *         parameter can be one of the following:
     *           + L6474_ABS_POS
     *           + L6474_EL_POS
     *           + L6474_MARK
     *           + L6474_RESERVED_REG01
     *           + L6474_RESERVED_REG02
     *           + L6474_RESERVED_REG03
     *           + L6474_RESERVED_REG04
     *           + L6474_RESERVED_REG05
     *           + L6474_RESERVED_REG06
     *           + L6474_TVAL           : value in mA
     *           + L6474_RESERVED_REG07
     *           + L6474_RESERVED_REG08
     *           + L6474_RESERVED_REG09
     *           + L6474_RESERVED_REG10
     *           + L6474_T_FAST
     *           + L6474_TON_MIN        : value in us
     *           + L6474_TOFF_MIN       : value in us
     *           + L6474_RESERVED_REG11
     *           + L6474_ADC_OUT
     *           + L6474_OCD_TH
     *           + L6474_RESERVED_REG12
     *           + L6474_STEP_MODE
     *           + L6474_ALARM_EN
     *           + L6474_CONFIG
     *           + L6474_STATUS
     *           + L6474_RESERVED_REG13
     *           + L6474_RESERVED_REG14
     *           + L6474_INEXISTENT_REG
     */
    virtual float GetParameter(unsigned int parameter)
    {
        unsigned int register_value = (unsigned int) L6474_CmdGetParam((L6474_Registers_t) parameter);
        float value;

        switch ((L6474_Registers_t) parameter)
        {
            case L6474_TVAL:
                value = L6474_Par_to_Tval_Current((float) register_value);
                break;
            case L6474_TON_MIN:
            case L6474_TOFF_MIN:
                value = L6474_Par_to_Tmin_Time((float) register_value);
                break;
            default:
                value = (float) register_value;
                break;
        }
        
        return value;
    }

    /**
     * @brief  Getting the position.
     * @param  None.
     * @retval The position.
     */
    virtual signed int GetPosition(void)
    {
        return (signed int) L6474_GetPosition();
    }

    /**
     * @brief  Getting the marked position.
     * @param  None.
     * @retval The marked position.
     */
    virtual signed int GetMark(void)
    {
        return (signed int) L6474_GetMark();
    }

    /**
     * @brief  Getting the current speed in pps.
     * @param  None.
     * @retval The current speed in pps.
     */
    virtual unsigned int GetSpeed(void)
    {
        return (unsigned int) L6474_GetCurrentSpeed();
    }

    /**
     * @brief  Getting the maximum speed in pps.
     * @param  None.
     * @retval The maximum speed in pps.
     */
    virtual unsigned int GetMaxSpeed(void)
    {
        return (unsigned int) L6474_GetMaxSpeed();
    }

    /**
     * @brief  Getting the minimum speed in pps.
     * @param  None.
     * @retval The minimum speed in pps.
     */
    virtual unsigned int GetMinSpeed(void)
    {
        return (unsigned int) L6474_GetMinSpeed();
    }

    /**
     * @brief  Getting the acceleration in pps^2.
     * @param  None.
     * @retval The acceleration in pps^2.
     */
    virtual unsigned int GetAcceleration(void)
    {
        return (unsigned int) L6474_GetAcceleration();
    }

    /**
     * @brief  Getting the deceleration in pps^2.
     * @param  None.
     * @retval The deceleration in pps^2.
     */
    virtual unsigned int GetDeceleration(void)
    {
        return (unsigned int) L6474_GetDeceleration();
    }

    /**
     * @brief  Getting the direction of rotation.
     * @param  None.
     * @retval The direction of rotation.
     */
    virtual direction_t GetDirection(void)
    {
        return (direction_t) (L6474_GetDirection() == FORWARD ? StepperMotor::FWD : StepperMotor::BWD);
    }

   /**
     * @brief  Setting a parameter.
     * @param  parameter A parameter's register adress.
     * @param  value The parameter's value.
     * @retval None.
     * @note   parameter can be one of the following:
     *           + L6474_ABS_POS
     *           + L6474_EL_POS
     *           + L6474_MARK
     *           + L6474_RESERVED_REG01
     *           + L6474_RESERVED_REG02
     *           + L6474_RESERVED_REG03
     *           + L6474_RESERVED_REG04
     *           + L6474_RESERVED_REG05
     *           + L6474_RESERVED_REG06
     *           + L6474_TVAL           : value in mA
     *           + L6474_RESERVED_REG07
     *           + L6474_RESERVED_REG08
     *           + L6474_RESERVED_REG09
     *           + L6474_RESERVED_REG10
     *           + L6474_T_FAST
     *           + L6474_TON_MIN        : value in us
     *           + L6474_TOFF_MIN       : value in us
     *           + L6474_RESERVED_REG11
     *           + L6474_ADC_OUT
     *           + L6474_OCD_TH
     *           + L6474_RESERVED_REG12
     *           + L6474_STEP_MODE
     *           + L6474_ALARM_EN
     *           + L6474_CONFIG
     *           + L6474_STATUS
     *           + L6474_RESERVED_REG13
     *           + L6474_RESERVED_REG14
     *           + L6474_INEXISTENT_REG
     */
    virtual void SetParameter(unsigned int parameter, float value)
    {
        float register_value;

        switch ((L6474_Registers_t) parameter)
        {
            case L6474_TVAL:
                register_value = L6474_Tval_Current_to_Par(value);
                break;
            case L6474_TON_MIN:
            case L6474_TOFF_MIN:
                register_value = L6474_Tmin_Time_to_Par(value);
                break;
            default:
                register_value = value;
                break;
        }

        L6474_CmdSetParam((L6474_Registers_t) parameter, (unsigned int) register_value);
    }

    /**
     * @brief  Setting the current position to be the home position.
     * @param  None.
     * @retval None.
     */
    virtual void SetHome(void)
    {
        L6474_SetHome();
    }

    /**
     * @brief  Setting the current position to be the marked position.
     * @param  None.
     * @retval None.
     */
    virtual void SetMark(void)
    {
        L6474_SetMark();
    }

    /**
     * @brief  Setting the maximum speed in pps.
     * @param  speed The maximum speed in pps.
     * @retval None.
     */
    virtual void SetMaxSpeed(unsigned int speed)
    {
        L6474_SetMaxSpeed((unsigned int) speed);
    }

    /**
     * @brief  Setting the minimum speed in pps.
     * @param  speed The minimum speed in pps.
     * @retval None.
     */
    virtual void SetMinSpeed(unsigned int speed)
    {
        L6474_SetMinSpeed((unsigned int) speed);
    }

    /**
     * @brief  Setting the acceleration in pps^2.
     * @param  acceleration The acceleration in pps^2.
     * @retval None.
     */
    virtual void SetAcceleration(unsigned int acceleration)
    {
        L6474_SetAcceleration((unsigned int) acceleration);
    }

    /**
     * @brief  Setting the deceleration in pps^2.
     * @param  deceleration The deceleration in pps^2.
     * @retval None.
     */
    virtual void SetDeceleration(unsigned int deceleration)
    {
        L6474_SetDeceleration((unsigned int) deceleration);
    }

    /**
     * @brief  Going to a specified position.
     * @param  position The desired position.
     * @retval None.
     */
    virtual void GoTo(signed int position)
    {
        L6474_GoTo((signed int) position);
    }

    /**
     * @brief  Going to the home position.
     * @param  None.
     * @retval None.
     */
    virtual void GoHome(void)
    {
        L6474_GoHome();
    }

    /**
     * @brief  Going to the marked position.
     * @param  None.
     * @retval None.
     */
    virtual void GoMark(void)
    {
        L6474_GoMark();
    }

    /**
     * @brief  Running the motor towards a specified direction.
     * @param  direction The direction of rotation.
     * @retval None.
     */
    virtual void Run(direction_t direction)
    {
        L6474_Run((motorDir_t) (direction == StepperMotor::FWD ? FORWARD : BACKWARD));
    }

    /**
     * @brief  Moving the motor towards a specified direction for a certain number of steps.
     * @param  direction The direction of rotation.
     * @param  steps The desired number of steps.
     * @retval None.
     */
    virtual void Move(direction_t direction, unsigned int steps)
    {
        L6474_Move((motorDir_t) (direction == StepperMotor::FWD ? FORWARD : BACKWARD), (unsigned int) steps);
    }

    /**
     * @brief  Stopping the motor through an immediate deceleration up to zero speed.
     * @param  None.
     * @retval None.
     */
    virtual void SoftStop(void)
    {
        L6474_SoftStop();
    }

    /**
     * @brief  Stopping the motor through an immediate infinite deceleration.
     * @param  None.
     * @retval None.
     */
    virtual void HardStop(void)
    {
        L6474_HardStop();
    }

    /**
     * @brief  Disabling the power bridge after performing a deceleration to zero.
     * @param  None.
     * @retval None.
     */
    virtual void SoftHiZ(void)
    {
        L6474_SoftStop();
        L6474_CmdDisable();
    }

    /**
     * @brief  Disabling the power bridge immediately.
     * @param  None.
     * @retval None.
     */
    virtual void HardHiZ(void)
    {
        L6474_HardStop();
        L6474_CmdDisable();
    }

    /**
     * @brief  Waiting while the motor is active.
     * @param  None.
     * @retval None.
     */
    virtual void WaitWhileActive(void)
    {
        L6474_WaitWhileActive();
    }

   /**
     * @brief  Getting the device state.
     * @param  None.
     * @retval The device state.
     * @note   The device state can be one of the following:
     *           + ACCELERATING
     *           + DECELERATING
     *           + STEADY
     *           + INACTIVE
    */
    virtual motorState_t GetDeviceState(void)
    {
        return (motorState_t) L6474_GetDeviceState();
    }

    /**
     * @brief  Reading the Status Register.
     * @param  None.
     * @retval None.
     * @note   The Status Register's flags are not cleared, contrary to GetStatus().
     */
    virtual uint16_t ReadStatusRegister(void)
    {
        return (uint16_t) L6474_ReadStatusRegister();
    }

    /**
     * @brief  Setting the Step Mode.
     * @param  step_mode The Step Mode.
     * @retval None.
     * @note   step_mode can be one of the following:
     *           + STEP_MODE_FULL
     *           + STEP_MODE_HALF
     *           + STEP_MODE_1_4
     *           + STEP_MODE_1_8
     *           + STEP_MODE_1_16
     *           + STEP_MODE_1_32
     *           + STEP_MODE_1_64
     *           + STEP_MODE_1_128
     */
    virtual void SetStepMode(motorStepMode_t step_mode)
    {
        L6474_SelectStepMode((motorStepMode_t) step_mode);
    }

    /**
     * @brief  Attaching an error handler.
     * @param  fptr An error handler.
     * @retval None.
     */
    virtual void AttachErrorHandler(void (*fptr)(uint16_t error))
    {
        L6474_AttachErrorHandler((void (*)(uint16_t error)) fptr);
    }

    /**
     * @brief  Enabling the device.
     * @param  None.
     * @retval None.
     */
    virtual void Enable(void)
    {
        L6474_CmdEnable();
    }
    
    /**
     * @brief  Disabling the device.
     * @param  None.
     * @retval None.
     */
    virtual void Disable(void)
    {
        L6474_CmdDisable();
    }

    /**
     * @brief  Getting the version of the firmware.
     * @param  None.
     * @retval The version of the firmware.
     */
    virtual uint8_t GetFwVersion(void)
    {
        return (uint8_t) L6474_GetFwVersion();
    }


    /*** Public Interrupt Related Methods ***/

    /* ACTION 6 --------------------------------------------------------------*
     * Implement here interrupt related methods, if any.                      *
     * Note that interrupt handling is platform dependent, e.g.:              *
     *   + mbed:                                                              *
     *     InterruptIn feature_irq(pin); //Interrupt object.                  *
     *     feature_irq.rise(callback);   //Attach a callback.                 *
     *     feature_irq.mode(PullNone);   //Set interrupt mode.                *
     *     feature_irq.enable_irq();     //Enable interrupt.                  *
     *     feature_irq.disable_irq();    //Disable interrupt.                 *
     *   + Arduino:                                                           *
     *     attachInterrupt(pin, callback, RISING); //Attach a callback.       *
     *     detachInterrupt(pin);                   //Detach a callback.       *
     *                                                                        *
     * Example (mbed):                                                        *
     *   void AttachFeatureIRQ(void (*fptr) (void))                           *
     *   {                                                                    *
     *     feature_irq.rise(fptr);                                            *
     *   }                                                                    *
     *                                                                        *
     *   void EnableFeatureIRQ(void)                                          *
     *   {                                                                    *
     *     feature_irq.enable_irq();                                          *
     *   }                                                                    *
     *                                                                        *
     *   void DisableFeatureIRQ(void)                                         *
     *   {                                                                    *
     *     feature_irq.disable_irq();                                         *
     *   }                                                                    *
     *------------------------------------------------------------------------*/
    /**
     * @brief  Attaching an interrupt handler to the FLAG interrupt.
     * @param  fptr An interrupt handler.
     * @retval None.
     */
    void AttachFlagIRQ(void (*fptr)(void))
    {
        flag_irq.fall(fptr);
    }
    
    /**
     * @brief  Enabling the FLAG interrupt handling.
     * @param  None.
     * @retval None.
     */
    void EnableFlagIRQ(void)
    {
        flag_irq.enable_irq();
    }
    
    /**
     * @brief  Disabling the FLAG interrupt handling.
     * @param  None.
     * @retval None.
     */
    void DisableFlagIRQ(void)
    {
        flag_irq.disable_irq();
    }


protected:

    /*** Protected Component Related Methods ***/

    /* ACTION 7 --------------------------------------------------------------*
     * Declare here the component's specific methods.                         *
     * They should be:                                                        *
     *   + Methods with the same name of the C component's virtual table's    *
     *     functions (1);                                                     *
     *   + Methods with the same name of the C component's extended virtual   *
     *     table's functions, if any (2);                                     *
     *   + Helper methods, if any, like functions declared in the component's *
     *     source files but not pointed by the component's virtual table (3). *
     *                                                                        *
     * Example:                                                               *
     *   Status_t COMPONENT_GetValue(float *f);   //(1)                       *
     *   Status_t COMPONENT_EnableFeature(void);  //(2)                       *
     *   Status_t COMPONENT_ComputeAverage(void); //(3)                       *
     *------------------------------------------------------------------------*/
    void L6474_AttachErrorHandler(void (*callback)(uint16_t error));
    Status_t L6474_Init(void *init);
    Status_t L6474_ReadID(uint8_t *id);
    uint16_t L6474_GetAcceleration(void);
    uint16_t L6474_GetCurrentSpeed(void);
    uint16_t L6474_GetDeceleration(void);
    motorState_t L6474_GetDeviceState(void);
    uint8_t L6474_GetFwVersion(void);
    int32_t L6474_GetMark(void);
    uint16_t L6474_GetMaxSpeed(void);
    uint16_t L6474_GetMinSpeed(void);
    int32_t L6474_GetPosition(void);
    void L6474_GoHome(void);
    void L6474_GoMark(void);
    void L6474_GoTo(int32_t targetPosition);
    void L6474_HardStop(void);
    void L6474_Move(motorDir_t direction, uint32_t stepCount);
    void L6474_Run(motorDir_t direction);
    bool L6474_SetAcceleration(uint16_t newAcc);
    bool L6474_SetDeceleration(uint16_t newDec);
    void L6474_SetHome(void);
    void L6474_SetMark(void);
    bool L6474_SetMaxSpeed(uint16_t newMaxSpeed);
    bool L6474_SetMinSpeed(uint16_t newMinSpeed);
    bool L6474_SoftStop(void);
    void L6474_WaitWhileActive(void);
    void L6474_CmdDisable(void);
    void L6474_CmdEnable(void);
    uint32_t L6474_CmdGetParam(L6474_Registers_t parameter);
    uint16_t L6474_CmdGetStatus(void);
    void L6474_CmdNop(void);
    void L6474_CmdSetParam(L6474_Registers_t parameter, uint32_t value);
    uint16_t L6474_ReadStatusRegister(void);
    void L6474_SelectStepMode(motorStepMode_t stepMod);
    motorDir_t L6474_GetDirection(void);
    void L6474_SetDirection(motorDir_t direction);
    void L6474_ApplySpeed(uint16_t newSpeed);
    void L6474_ComputeSpeedProfile(uint32_t nbSteps);
    int32_t L6474_ConvertPosition(uint32_t abs_position_reg);
    void L6474_ErrorHandler(uint16_t error);
    void L6474_SendCommand(uint8_t param);
    void L6474_SetRegisterToPredefinedValues(void);
    void L6474_SetRegisterToInitializationValues(L6474_Init_t *init);
    void L6474_WriteBytes(uint8_t *pByteToTransmit, uint8_t *pReceivedByte);
    void L6474_SetDeviceParamsToPredefinedValues(void);
    void L6474_StartMovement(void);
    void L6474_StepClockHandler(void);
    float L6474_Tval_Current_to_Par(float current_mA);
    float L6474_Par_to_Tval_Current(float Tval);
    float L6474_Tmin_Time_to_Par(float ton_min_us);
    float L6474_Par_to_Tmin_Time(float Tmin);


    /*** Component's I/O Methods ***/

    /**
     * @brief      Utility function to read data from L6474.
     * @param[out] pBuffer pointer to the buffer to read data into.
     * @param[in]  NumBytesToRead number of bytes to read.
     * @retval     COMPONENT_OK in case of success, COMPONENT_ERROR otherwise.
     */
    Status_t Read(uint8_t* pBuffer, uint16_t NumBytesToRead)
    {
        if (dev_spi.spi_read(pBuffer, ssel, NumBytesToRead) != 0)
            return COMPONENT_ERROR;
        return COMPONENT_OK;
    }
    
    /**
     * @brief      Utility function to write data to L6474.
     * @param[in]  pBuffer pointer to the buffer of data to send.
     * @param[in]  NumBytesToWrite number of bytes to write.
     * @retval     COMPONENT_OK in case of success, COMPONENT_ERROR otherwise.
     */
    Status_t Write(uint8_t* pBuffer, uint16_t NumBytesToWrite)
    {
        if (dev_spi.spi_write(pBuffer, ssel, NumBytesToWrite) != 0)
            return COMPONENT_ERROR;
        return COMPONENT_OK;
    }

    /**
     * @brief      Utility function to read and write data from/to L6474 at the same time.
     * @param[out] pBufferToRead pointer to the buffer to read data into.
     * @param[in]  pBufferToWrite pointer to the buffer of data to send.
     * @param[in]  NumBytes number of bytes to read and write.
     * @retval     COMPONENT_OK in case of success, COMPONENT_ERROR otherwise.
     */
    Status_t ReadWrite(uint8_t* pBufferToRead, uint8_t* pBufferToWrite, uint16_t NumBytes)
    {
        if (dev_spi.spi_read_write(pBufferToRead, pBufferToWrite, ssel, NumBytes) != 0)
            return COMPONENT_ERROR;
        return COMPONENT_OK;
    }

    /* ACTION 8 --------------------------------------------------------------*
     * Implement here other I/O methods beyond those already implemented      *
     * above, which are declared extern within the component's header file.   *
     *------------------------------------------------------------------------*/
    /**
     * @brief  Making the CPU wait.
     * @param  None.
     * @retval None.
     */
    void L6474_Delay(uint32_t delay)
    {
        wait_ms(delay);
    }

    /**
     * @brief  Enabling interrupts.
     * @param  None.
     * @retval None.
     */
    void L6474_EnableIrq(void)
    {
        __enable_irq();
    }

    /**
     * @brief  Disabling interrupts.
     * @param  None.
     * @retval None.
     */
    void L6474_DisableIrq(void)
    {
        __disable_irq();
    }

    /**
     * @brief  Initialising the PWM.
     * @param  None.
     * @retval None.
     */
    void L6474_PwmInit(void) {}

    /**
     * @brief  Setting the frequency of PWM.
     *         The frequency controls directly the speed of the device.
     * @param  frequency the frequency of PWM.
     * @retval None.
     */
    void L6474_PwmSetFreq(uint16_t frequency)
    {
        /* Computing the period of PWM. */
        //double period = 1.0f / frequency;
        //
        ///* Setting the period and the duty-cycle of PWM. */
        //pwm.period(period);
        //pwm.write(0.5f);

        ///* Setting a callback with the same period of PWM's, to update the state machine. */
        //ticker.attach(this, &L6474::L6474_StepClockHandler, period);
    }

    /**
     * @brief  Stopping the PWM.
     * @param  None.
     * @retval None.
     */
    void L6474_PwmStop(void)
    {
        //pwm.write(0.0f);
        //ticker.detach();
    }

    /**
     * @brief  Putting the device in standby mode.
     * @param  None.
     * @retval None.
     */
    void L6474_ReleaseReset(void)
    {
        standby_reset = 1;
    }

    /**
     * @brief  Putting the device in reset mode.
     * @param  None.
     * @retval None.
     */
    void L6474_Reset(void)
    {
        standby_reset = 0;
    }

    /**
     * @brief  Setting the direction of rotation.
     * @param  gpioState direction of rotation: "1" for forward, "0" for backward.
     * @retval None.
     */
    void L6474_SetDirectionGpio(uint8_t gpioState)
    {
        direction = gpioState;
    }

    /**
     * @brief      Writing and reading bytes to/from the component through the SPI at the same time.
     * @param[in]  pByteToTransmit pointer to the buffer of data to send.
     * @param[out] pReceivedByte pointer to the buffer to read data into.
     * @retval     "0" in case of success, "1" otherwise.
     */
    uint8_t L6474_SpiWriteBytes(uint8_t *pByteToTransmit, uint8_t *pReceivedByte)
    {
        return (uint8_t) (ReadWrite(pReceivedByte, pByteToTransmit, number_of_devices) == COMPONENT_OK ? 0 : 1);
    }


    /*** Component's Instance Variables ***/

    /* ACTION 9 --------------------------------------------------------------*
     * Declare here interrupt related variables, if needed.                   *
     * Note that interrupt handling is platform dependent, see                *
     * "Interrupt Related Methods" above.                                     *
     *                                                                        *
     * Example:                                                               *
     *   + mbed:                                                              *
     *     InterruptIn feature_irq;                                           *
     *------------------------------------------------------------------------*/
    /* Flag Interrupt. */
    InterruptIn flag_irq;

    /* ACTION 10 -------------------------------------------------------------*
     * Declare here other pin related variables, if needed.                   *
     *                                                                        *
     * Example:                                                               *
     *   + mbed:                                                              *
     *     DigitalOut standby_reset;                                          *
     *------------------------------------------------------------------------*/
    /* Standby/reset pin. */
    DigitalOut standby_reset;

    /* Direction of rotation pin. */
    DigitalOut direction;

    /* Pulse Width Modulation pin. */
    PwmOut pwm;

    /* Timer to trigger the PWM callback at each PWM pulse. */
    //Ticker ticker;

    /* ACTION 11 -------------------------------------------------------------*
     * Declare here communication related variables, if needed.               *
     *                                                                        *
     * Example:                                                               *
     *   + mbed:                                                              *
     *     DigitalOut ssel;                                                   *
     *     DevSPI &dev_spi;                                                   *
     *------------------------------------------------------------------------*/
    /* Configuration. */
    DigitalOut ssel;

    /* IO Device. */
    DevSPI &dev_spi;

    /* ACTION 12 -------------------------------------------------------------*
     * Declare here identity related variables, if needed.                    *
     * Note that there should be only a unique identifier for each component, *
     * which should be the "who_am_i" parameter.                              *
     *------------------------------------------------------------------------*/
    /* Identity */
    uint8_t who_am_i;

    /* ACTION 13 -------------------------------------------------------------*
     * Declare here the component's static and non-static data, one variable  *
     * per line.                                                              *
     *                                                                        *
     * Example:                                                               *
     *   float measure;                                                       *
     *   int instance_id;                                                     *
     *   static int number_of_instances;                                      *
     *------------------------------------------------------------------------*/
    /* Data. */
    void (*error_handler_callback)(uint16_t error);
    deviceParams_t device_prm;
    uint8_t device_instance;

    /* Static data. */
    static uint8_t number_of_devices;
    static uint8_t spi_tx_bursts[L6474_CMD_ARG_MAX_NB_BYTES][MAX_NUMBER_OF_DEVICES];
    static uint8_t spi_rx_bursts[L6474_CMD_ARG_MAX_NB_BYTES][MAX_NUMBER_OF_DEVICES];


public:

    /* Static data. */
    static bool spi_preemtion_by_isr;
    static bool isr_flag;
};

#endif // __L6474_CLASS_H

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/