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/**

  ******************************************************************************

  * @file    stm32f1xx_hal_i2c.c

  * @author  MCD Application Team

  * @brief   I2C HAL module driver.

  *          This file provides firmware functions to manage the following

  *          functionalities of the Inter Integrated Circuit (I2C) peripheral:

  *           + Initialization and de-initialization functions

  *           + IO operation functions

  *           + Peripheral State, Mode and Error functions

  *

  @verbatim

  ==============================================================================

                        ##### How to use this driver #####

  ==============================================================================

  [..]

    The I2C HAL driver can be used as follows:

    (#) Declare a I2C_HandleTypeDef handle structure, for example:

        I2C_HandleTypeDef  hi2c;

    (#)Initialize the I2C low level resources by implementing the HAL_I2C_MspInit() API:

        (##) Enable the I2Cx interface clock

        (##) I2C pins configuration

            (+++) Enable the clock for the I2C GPIOs

            (+++) Configure I2C pins as alternate function open-drain

        (##) NVIC configuration if you need to use interrupt process

            (+++) Configure the I2Cx interrupt priority

            (+++) Enable the NVIC I2C IRQ Channel

        (##) DMA Configuration if you need to use DMA process

            (+++) Declare a DMA_HandleTypeDef handle structure for the transmit or receive channel

            (+++) Enable the DMAx interface clock using

            (+++) Configure the DMA handle parameters

            (+++) Configure the DMA Tx or Rx channel

            (+++) Associate the initialized DMA handle to the hi2c DMA Tx or Rx handle

            (+++) Configure the priority and enable the NVIC for the transfer complete interrupt on

                  the DMA Tx or Rx channel

    (#) Configure the Communication Speed, Duty cycle, Addressing mode, Own Address1,

        Dual Addressing mode, Own Address2, General call and Nostretch mode in the hi2c Init structure.

    (#) Initialize the I2C registers by calling the HAL_I2C_Init(), configures also the low level Hardware

        (GPIO, CLOCK, NVIC...etc) by calling the customized HAL_I2C_MspInit(&hi2c) API.

    (#) To check if target device is ready for communication, use the function HAL_I2C_IsDeviceReady()

    (#) For I2C IO and IO MEM operations, three operation modes are available within this driver :

    *** Polling mode IO operation ***

    =================================

    [..]

      (+) Transmit in master mode an amount of data in blocking mode using HAL_I2C_Master_Transmit()

      (+) Receive in master mode an amount of data in blocking mode using HAL_I2C_Master_Receive()

      (+) Transmit in slave mode an amount of data in blocking mode using HAL_I2C_Slave_Transmit()

      (+) Receive in slave mode an amount of data in blocking mode using HAL_I2C_Slave_Receive()

    *** Polling mode IO MEM operation ***

    =====================================

    [..]

      (+) Write an amount of data in blocking mode to a specific memory address using HAL_I2C_Mem_Write()

      (+) Read an amount of data in blocking mode from a specific memory address using HAL_I2C_Mem_Read()

    *** Interrupt mode IO operation ***

    ===================================

    [..]

      (+) Transmit in master mode an amount of data in non blocking mode using HAL_I2C_Master_Transmit_IT()

      (+) At transmission end of transfer HAL_I2C_MasterTxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_MasterTxCpltCallback

      (+) Receive in master mode an amount of data in non blocking mode using HAL_I2C_Master_Receive_IT()

      (+) At reception end of transfer HAL_I2C_MasterRxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_MasterRxCpltCallback

      (+) Transmit in slave mode an amount of data in non blocking mode using HAL_I2C_Slave_Transmit_IT()

      (+) At transmission end of transfer HAL_I2C_SlaveTxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_SlaveTxCpltCallback

      (+) Receive in slave mode an amount of data in non blocking mode using HAL_I2C_Slave_Receive_IT()

      (+) At reception end of transfer HAL_I2C_SlaveRxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_SlaveRxCpltCallback

      (+) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and user can

           add his own code by customization of function pointer HAL_I2C_ErrorCallback

      (+) Abort a master I2C process communication with Interrupt using HAL_I2C_Master_Abort_IT()

      (+) End of abort process, HAL_I2C_AbortCpltCallback() is executed and user can

           add his own code by customization of function pointer HAL_I2C_AbortCpltCallback()

    *** Interrupt mode IO sequential operation ***

    ==============================================

    [..]

      (@) These interfaces allow to manage a sequential transfer with a repeated start condition

          when a direction change during transfer

    [..]

      (+) A specific option field manage the different steps of a sequential transfer

      (+) Option field values are defined through @ref I2C_XFEROPTIONS and are listed below:

      (++) I2C_FIRST_AND_LAST_FRAME: No sequential usage, functionnal is same as associated interfaces in no sequential mode

      (++) I2C_FIRST_FRAME: Sequential usage, this option allow to manage a sequence with start condition, address

                            and data to transfer without a final stop condition

      (++) I2C_NEXT_FRAME: Sequential usage, this option allow to manage a sequence with a restart condition, address

                            and with new data to transfer if the direction change or manage only the new data to transfer

                            if no direction change and without a final stop condition in both cases

      (++) I2C_LAST_FRAME: Sequential usage, this option allow to manage a sequance with a restart condition, address

                            and with new data to transfer if the direction change or manage only the new data to transfer

                            if no direction change and with a final stop condition in both cases

      (+) Differents sequential I2C interfaces are listed below:

      (++) Sequential transmit in master I2C mode an amount of data in non-blocking mode using HAL_I2C_Master_Sequential_Transmit_IT()

      (+++) At transmission end of current frame transfer, HAL_I2C_MasterTxCpltCallback() is executed and user can

           add his own code by customization of function pointer HAL_I2C_MasterTxCpltCallback()

      (++) Sequential receive in master I2C mode an amount of data in non-blocking mode using HAL_I2C_Master_Sequential_Receive_IT()

      (+++) At reception end of current frame transfer, HAL_I2C_MasterRxCpltCallback() is executed and user can

           add his own code by customization of function pointer HAL_I2C_MasterRxCpltCallback()

      (++) Abort a master I2C process communication with Interrupt using HAL_I2C_Master_Abort_IT()

      (+++) End of abort process, HAL_I2C_AbortCpltCallback() is executed and user can

           add his own code by customization of function pointer HAL_I2C_AbortCpltCallback()

      (++) Enable/disable the Address listen mode in slave I2C mode using HAL_I2C_EnableListen_IT() HAL_I2C_DisableListen_IT()

      (+++) When address slave I2C match, HAL_I2C_AddrCallback() is executed and user can

           add his own code to check the Address Match Code and the transmission direction request by master (Write/Read).

      (+++) At Listen mode end HAL_I2C_ListenCpltCallback() is executed and user can

           add his own code by customization of function pointer HAL_I2C_ListenCpltCallback()

      (++) Sequential transmit in slave I2C mode an amount of data in non-blocking mode using HAL_I2C_Slave_Sequential_Transmit_IT()

      (+++) At transmission end of current frame transfer, HAL_I2C_SlaveTxCpltCallback() is executed and user can

           add his own code by customization of function pointer HAL_I2C_SlaveTxCpltCallback()

      (++) Sequential receive in slave I2C mode an amount of data in non-blocking mode using HAL_I2C_Slave_Sequential_Receive_IT()

      (+++) At reception end of current frame transfer, HAL_I2C_SlaveRxCpltCallback() is executed and user can

           add his own code by customization of function pointer HAL_I2C_SlaveRxCpltCallback()

      (++) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and user can

           add his own code by customization of function pointer HAL_I2C_ErrorCallback()

    *** Interrupt mode IO MEM operation ***

    =======================================

    [..]

      (+) Write an amount of data in no-blocking mode with Interrupt to a specific memory address using

          HAL_I2C_Mem_Write_IT()

      (+) At MEM end of write transfer HAL_I2C_MemTxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_MemTxCpltCallback

      (+) Read an amount of data in no-blocking mode with Interrupt from a specific memory address using

          HAL_I2C_Mem_Read_IT()

      (+) At MEM end of read transfer HAL_I2C_MemRxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_MemRxCpltCallback

      (+) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and user can

           add his own code by customization of function pointer HAL_I2C_ErrorCallback

    *** DMA mode IO operation ***

    ==============================

    [..]

      (+) Transmit in master mode an amount of data in non blocking mode (DMA) using

          HAL_I2C_Master_Transmit_DMA()

      (+) At transmission end of transfer HAL_I2C_MasterTxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_MasterTxCpltCallback

      (+) Receive in master mode an amount of data in non blocking mode (DMA) using

          HAL_I2C_Master_Receive_DMA()

      (+) At reception end of transfer HAL_I2C_MasterRxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_MasterRxCpltCallback

      (+) Transmit in slave mode an amount of data in non blocking mode (DMA) using

          HAL_I2C_Slave_Transmit_DMA()

      (+) At transmission end of transfer HAL_I2C_SlaveTxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_SlaveTxCpltCallback

      (+) Receive in slave mode an amount of data in non blocking mode (DMA) using

          HAL_I2C_Slave_Receive_DMA()

      (+) At reception end of transfer HAL_I2C_SlaveRxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_SlaveRxCpltCallback

      (+) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and user can

           add his own code by customization of function pointer HAL_I2C_ErrorCallback

      (+) Abort a master I2C process communication with Interrupt using HAL_I2C_Master_Abort_IT()

      (+) End of abort process, HAL_I2C_AbortCpltCallback() is executed and user can

           add his own code by customization of function pointer HAL_I2C_AbortCpltCallback()

    *** DMA mode IO MEM operation ***

    =================================

    [..]

      (+) Write an amount of data in no-blocking mode with DMA to a specific memory address using

          HAL_I2C_Mem_Write_DMA()

      (+) At MEM end of write transfer HAL_I2C_MemTxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_MemTxCpltCallback

      (+) Read an amount of data in no-blocking mode with DMA from a specific memory address using

          HAL_I2C_Mem_Read_DMA()

      (+) At MEM end of read transfer HAL_I2C_MemRxCpltCallback is executed and user can

           add his own code by customization of function pointer HAL_I2C_MemRxCpltCallback

      (+) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and user can

           add his own code by customization of function pointer HAL_I2C_ErrorCallback

     *** I2C HAL driver macros list ***

     ==================================

     [..]

       Below the list of most used macros in I2C HAL driver.

      (+) __HAL_I2C_ENABLE: Enable the I2C peripheral

      (+) __HAL_I2C_DISABLE: Disable the I2C peripheral

      (+) __HAL_I2C_GET_FLAG : Checks whether the specified I2C flag is set or not

      (+) __HAL_I2C_CLEAR_FLAG : Clear the specified I2C pending flag

      (+) __HAL_I2C_ENABLE_IT: Enable the specified I2C interrupt

      (+) __HAL_I2C_DISABLE_IT: Disable the specified I2C interrupt

     [..]

       (@) You can refer to the I2C HAL driver header file for more useful macros

     *** I2C Workarounds linked to Silicon Limitation ***

     ====================================================

     [..]

       Below the list of all silicon limitations implemented for HAL on STM32F1xx product.

       (@) See ErrataSheet to know full silicon limitation list of your product.

       (#) Workarounds Implemented inside I2C HAL Driver

          (##) Wrong data read into data register (Polling and Interrupt mode)

          (##) Start cannot be generated after a misplaced Stop

          (##) Some software events must be managed before the current byte is being transferred:

               Workaround: Use DMA in general, except when the Master is receiving a single byte.

               For Interupt mode, I2C should have the highest priority in the application.

          (##) Mismatch on the "Setup time for a repeated Start condition" timing parameter:

               Workaround: Reduce the frequency down to 88 kHz or use the I2C Fast-mode if

               supported by the slave.

          (##) Data valid time (tVD;DAT) violated without the OVR flag being set:

               Workaround: If the slave device allows it, use the clock stretching mechanism

               by programming NoStretchMode = I2C_NOSTRETCH_DISABLE in HAL_I2C_Init.

  @endverbatim

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT(c) 2016 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.

  *

  ******************************************************************************

  */

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

#include "stm32f1xx_hal.h"

/** @addtogroup STM32F1xx_HAL_Driver

  * @{

  */

/** @defgroup I2C I2C

  * @brief I2C HAL module driver

  * @{

  */

#ifdef HAL_I2C_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/** @addtogroup I2C_Private_Define

  * @{

  */    

#define I2C_TIMEOUT_FLAG          35U         /*!< Timeout 35 ms             */

#define I2C_TIMEOUT_BUSY_FLAG     25U         /*!< Timeout 25 ms             */

#define I2C_NO_OPTION_FRAME       0xFFFF0000U /*!< XferOptions default value */

/* Private define for @ref PreviousState usage */

#define I2C_STATE_MSK             ((uint32_t)((HAL_I2C_STATE_BUSY_TX | HAL_I2C_STATE_BUSY_RX) & (~(uint32_t)HAL_I2C_STATE_READY))) /*!< Mask State define, keep only RX and TX bits            */

#define I2C_STATE_NONE            ((uint32_t)(HAL_I2C_MODE_NONE))                                                        /*!< Default Value                                          */

#define I2C_STATE_MASTER_BUSY_TX  ((uint32_t)((HAL_I2C_STATE_BUSY_TX & I2C_STATE_MSK) | HAL_I2C_MODE_MASTER))            /*!< Master Busy TX, combinaison of State LSB and Mode enum */

#define I2C_STATE_MASTER_BUSY_RX  ((uint32_t)((HAL_I2C_STATE_BUSY_RX & I2C_STATE_MSK) | HAL_I2C_MODE_MASTER))            /*!< Master Busy RX, combinaison of State LSB and Mode enum */

#define I2C_STATE_SLAVE_BUSY_TX   ((uint32_t)((HAL_I2C_STATE_BUSY_TX & I2C_STATE_MSK) | HAL_I2C_MODE_SLAVE))             /*!< Slave Busy TX, combinaison of State LSB and Mode enum  */

#define I2C_STATE_SLAVE_BUSY_RX   ((uint32_t)((HAL_I2C_STATE_BUSY_RX & I2C_STATE_MSK) | HAL_I2C_MODE_SLAVE))             /*!< Slave Busy RX, combinaison of State LSB and Mode enum  */

/**

  * @}

  */

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/** @addtogroup I2C_Private_Functions

  * @{

  */

/* Private functions to handle DMA transfer */

static void I2C_DMAXferCplt(DMA_HandleTypeDef *hdma);

static void I2C_DMAError(DMA_HandleTypeDef *hdma);

static void I2C_DMAAbort(DMA_HandleTypeDef *hdma);

static void I2C_ITError(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_MasterRequestWrite(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_MasterRequestRead(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_RequestMemoryWrite(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_RequestMemoryRead(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_WaitOnFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Flag, FlagStatus Status, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_WaitOnMasterAddressFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Flag, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_WaitOnTXEFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_WaitOnBTFFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_WaitOnRXNEFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_WaitOnSTOPFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart);

static HAL_StatusTypeDef I2C_IsAcknowledgeFailed(I2C_HandleTypeDef *hi2c);

/* Private functions for I2C transfer IRQ handler */

static HAL_StatusTypeDef I2C_MasterTransmit_TXE(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_MasterTransmit_BTF(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_MasterReceive_RXNE(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_MasterReceive_BTF(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_Master_SB(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_Master_ADD10(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_Master_ADDR(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_SlaveTransmit_TXE(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_SlaveTransmit_BTF(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_SlaveReceive_RXNE(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_SlaveReceive_BTF(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_Slave_ADDR(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_Slave_STOPF(I2C_HandleTypeDef *hi2c);

static HAL_StatusTypeDef I2C_Slave_AF(I2C_HandleTypeDef *hi2c);

/**

  * @}

  */

/* Exported functions --------------------------------------------------------*/

/** @defgroup I2C_Exported_Functions I2C Exported Functions

  * @{

  */

/** @defgroup I2C_Exported_Functions_Group1 Initialization and de-initialization functions

 *  @brief    Initialization and Configuration functions

 *

@verbatim

 ===============================================================================

              ##### Initialization and de-initialization functions #####

 ===============================================================================

    [..]  This subsection provides a set of functions allowing to initialize and

          de-initialize the I2Cx peripheral:

      (+) User must Implement HAL_I2C_MspInit() function in which he configures

          all related peripherals resources (CLOCK, GPIO, DMA, IT and NVIC).

      (+) Call the function HAL_I2C_Init() to configure the selected device with

          the selected configuration:

        (++) Communication Speed

        (++) Duty cycle

        (++) Addressing mode

        (++) Own Address 1

        (++) Dual Addressing mode

        (++) Own Address 2

        (++) General call mode

        (++) Nostretch mode

      (+) Call the function HAL_I2C_DeInit() to restore the default configuration

          of the selected I2Cx peripheral.

@endverbatim

  * @{

  */

/**

  * @brief  Initializes the I2C according to the specified parameters

  *         in the I2C_InitTypeDef and create the associated handle.

  * @param  hi2c: pointer to a I2C_HandleTypeDef structure that contains

  *         the configuration information for I2C module

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_I2C_Init(I2C_HandleTypeDef *hi2c)

{

  uint32_t freqrange = 0U;

  uint32_t pclk1 = 0U;

  /* Check the I2C handle allocation */

  if(hi2c == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));

  assert_param(IS_I2C_CLOCK_SPEED(hi2c->Init.ClockSpeed));

  assert_param(IS_I2C_DUTY_CYCLE(hi2c->Init.DutyCycle));

  assert_param(IS_I2C_OWN_ADDRESS1(hi2c->Init.OwnAddress1));

  assert_param(IS_I2C_ADDRESSING_MODE(hi2c->Init.AddressingMode));

  assert_param(IS_I2C_DUAL_ADDRESS(hi2c->Init.DualAddressMode));

  assert_param(IS_I2C_OWN_ADDRESS2(hi2c->Init.OwnAddress2));

  assert_param(IS_I2C_GENERAL_CALL(hi2c->Init.GeneralCallMode));

  assert_param(IS_I2C_NO_STRETCH(hi2c->Init.NoStretchMode));

  if(hi2c->State == HAL_I2C_STATE_RESET)

  {

    /* Allocate lock resource and initialize it */

    hi2c->Lock = HAL_UNLOCKED;

    /* Init the low level hardware : GPIO, CLOCK, NVIC */

    HAL_I2C_MspInit(hi2c);

  }

  hi2c->State = HAL_I2C_STATE_BUSY;

  /* Disable the selected I2C peripheral */

  __HAL_I2C_DISABLE(hi2c);

  /* Get PCLK1 frequency */

  pclk1 = HAL_RCC_GetPCLK1Freq();

  /* Check the minimum allowed PCLK1 frequency */

  if (I2C_MIN_PCLK_FREQ(pclk1, hi2c->Init.ClockSpeed) == 1U)

  {

    return HAL_ERROR;

  }

  /* Calculate frequency range */

  freqrange = I2C_FREQRANGE(pclk1);

  /*---------------------------- I2Cx CR2 Configuration ----------------------*/

  /* Configure I2Cx: Frequency range */

  hi2c->Instance->CR2 = freqrange;

  /*---------------------------- I2Cx TRISE Configuration --------------------*/

  /* Configure I2Cx: Rise Time */

  hi2c->Instance->TRISE = I2C_RISE_TIME(freqrange, hi2c->Init.ClockSpeed);

  /*---------------------------- I2Cx CCR Configuration ----------------------*/

  /* Configure I2Cx: Speed */

  hi2c->Instance->CCR = I2C_SPEED(pclk1, hi2c->Init.ClockSpeed, hi2c->Init.DutyCycle);

  /*---------------------------- I2Cx CR1 Configuration ----------------------*/

  /* Configure I2Cx: Generalcall and NoStretch mode */

  hi2c->Instance->CR1 = (hi2c->Init.GeneralCallMode | hi2c->Init.NoStretchMode);

  /*---------------------------- I2Cx OAR1 Configuration ---------------------*/

  /* Configure I2Cx: Own Address1 and addressing mode */

  hi2c->Instance->OAR1 = (hi2c->Init.AddressingMode | hi2c->Init.OwnAddress1);

  /*---------------------------- I2Cx OAR2 Configuration ---------------------*/

  /* Configure I2Cx: Dual mode and Own Address2 */

  hi2c->Instance->OAR2 = (hi2c->Init.DualAddressMode | hi2c->Init.OwnAddress2);

  /* Enable the selected I2C peripheral */

  __HAL_I2C_ENABLE(hi2c);

  hi2c->ErrorCode = HAL_I2C_ERROR_NONE;

  hi2c->State = HAL_I2C_STATE_READY;

  hi2c->PreviousState = I2C_STATE_NONE;

  hi2c->Mode = HAL_I2C_MODE_NONE;

  return HAL_OK;

}

/**

  * @brief  DeInitializes the I2C peripheral.

  * @param  hi2c: pointer to a I2C_HandleTypeDef structure that contains

  *         the configuration information for I2C module

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_I2C_DeInit(I2C_HandleTypeDef *hi2c)

{

  /* Check the I2C handle allocation */

  if(hi2c == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));

  hi2c->State = HAL_I2C_STATE_BUSY;

  /* Disable the I2C Peripheral Clock */

  __HAL_I2C_DISABLE(hi2c);

  /* DeInit the low level hardware: GPIO, CLOCK, NVIC */

  HAL_I2C_MspDeInit(hi2c);

  hi2c->ErrorCode     = HAL_I2C_ERROR_NONE;

  hi2c->State         = HAL_I2C_STATE_RESET;

  hi2c->PreviousState = I2C_STATE_NONE;

  hi2c->Mode          = HAL_I2C_MODE_NONE;

  /* Release Lock */

  __HAL_UNLOCK(hi2c);

  return HAL_OK;

}

/**

  * @brief I2C MSP Init.

  * @param  hi2c: pointer to a I2C_HandleTypeDef structure that contains

  *         the configuration information for I2C module

  * @retval None

  */

 __weak void HAL_I2C_MspInit(I2C_HandleTypeDef *hi2c)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(hi2c);

  /* NOTE : This function Should not be modified, when the callback is needed,

            the HAL_I2C_MspInit could be implemented in the user file

   */

}

/**

  * @brief I2C MSP DeInit

  * @param  hi2c: pointer to a I2C_HandleTypeDef structure that contains

  *         the configuration information for I2C module

  * @retval None

  */

 __weak void HAL_I2C_MspDeInit(I2C_HandleTypeDef *hi2c)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(hi2c);

  /* NOTE : This function Should not be modified, when the callback is needed,

            the HAL_I2C_MspDeInit could be implemented in the user file

   */

}

/**

  * @}

  */

/** @defgroup I2C_Exported_Functions_Group2 IO operation functions

 *  @brief   Data transfers functions

 *

@verbatim

 ===============================================================================

                      ##### IO operation functions #####

 ===============================================================================

    [..]

    This subsection provides a set of functions allowing to manage the I2C data

    transfers.

    (#) There are two modes of transfer:

       (++) Blocking mode : The communication is performed in the polling mode.

            The status of all data processing is returned by the same function

            after finishing transfer.

       (++) No-Blocking mode : The communication is performed using Interrupts

            or DMA. These functions return the status of the transfer startup.

            The end of the data processing will be indicated through the

            dedicated I2C IRQ when using Interrupt mode or the DMA IRQ when

            using DMA mode.

    (#) Blocking mode functions are :

        (++) HAL_I2C_Master_Transmit()

        (++) HAL_I2C_Master_Receive()

        (++) HAL_I2C_Slave_Transmit()

        (++) HAL_I2C_Slave_Receive()

        (++) HAL_I2C_Mem_Write()

        (++) HAL_I2C_Mem_Read()

        (++) HAL_I2C_IsDeviceReady()

    (#) No-Blocking mode functions with Interrupt are :

        (++) HAL_I2C_Master_Transmit_IT()

        (++) HAL_I2C_Master_Receive_IT()

        (++) HAL_I2C_Slave_Transmit_IT()

        (++) HAL_I2C_Slave_Receive_IT()

        (++) HAL_I2C_Master_Sequential_Transmit_IT()

        (++) HAL_I2C_Master_Sequential_Receive_IT()

        (++) HAL_I2C_Slave_Sequential_Transmit_IT()

        (++) HAL_I2C_Slave_Sequential_Receive_IT()

        (++) HAL_I2C_Mem_Write_IT()

        (++) HAL_I2C_Mem_Read_IT()

    (#) No-Blocking mode functions with DMA are :

        (++) HAL_I2C_Master_Transmit_DMA()

        (++) HAL_I2C_Master_Receive_DMA()

        (++) HAL_I2C_Slave_Transmit_DMA()

        (++) HAL_I2C_Slave_Receive_DMA()

        (++) HAL_I2C_Mem_Write_DMA()

        (++) HAL_I2C_Mem_Read_DMA()

    (#) A set of Transfer Complete Callbacks are provided in non Blocking mode:

        (++) HAL_I2C_MemTxCpltCallback()

        (++) HAL_I2C_MemRxCpltCallback()

        (++) HAL_I2C_MasterTxCpltCallback()

        (++) HAL_I2C_MasterRxCpltCallback()

        (++) HAL_I2C_SlaveTxCpltCallback()

        (++) HAL_I2C_SlaveRxCpltCallback()

        (++) HAL_I2C_ErrorCallback()

        (++) HAL_I2C_AbortCpltCallback()

@endverbatim

  * @{

  */

/**

  * @brief  Transmits in master mode an amount of data in blocking mode.

  * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains

  *                the configuration information for the specified I2C.

  * @param  DevAddress Target device address: The device 7 bits address value

  *         in datasheet must be shifted to the left before calling the interface

  * @param  pData Pointer to data buffer

  * @param  Size Amount of data to be sent

  * @param  Timeout Timeout duration

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_I2C_Master_Transmit(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout)

{

  uint32_t tickstart = 0x00U;

  /* Init tickstart for timeout management*/

  tickstart = HAL_GetTick();

  if(hi2c->State == HAL_I2C_STATE_READY)

  {

    /* Wait until BUSY flag is reset */

    if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, I2C_TIMEOUT_BUSY_FLAG, tickstart) != HAL_OK)

    {

      return HAL_BUSY;

    }

    /* Process Locked */

    __HAL_LOCK(hi2c);

    /* Check if the I2C is already enabled */

    if((hi2c->Instance->CR1 & I2C_CR1_PE) != I2C_CR1_PE)

    {

      /* Enable I2C peripheral */

      __HAL_I2C_ENABLE(hi2c);

    }

    /* Disable Pos */

    hi2c->Instance->CR1 &= ~I2C_CR1_POS;

    hi2c->State     = HAL_I2C_STATE_BUSY_TX;

    hi2c->Mode      = HAL_I2C_MODE_MASTER;

    hi2c->ErrorCode = HAL_I2C_ERROR_NONE;

    /* Prepare transfer parameters */

    hi2c->pBuffPtr    = pData;

    hi2c->XferCount   = Size;

    hi2c->XferOptions = I2C_NO_OPTION_FRAME;

    hi2c->XferSize    = hi2c->XferCount;

    /* Send Slave Address */

    if(I2C_MasterRequestWrite(hi2c, DevAddress, Timeout, tickstart) != HAL_OK)

    {

      if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)

      {

        /* Process Unlocked */

        __HAL_UNLOCK(hi2c);

        return HAL_ERROR;

      }

      else

      {

        /* Process Unlocked */

        __HAL_UNLOCK(hi2c);

        return HAL_TIMEOUT;

      }

    }

    /* Clear ADDR flag */

    __HAL_I2C_CLEAR_ADDRFLAG(hi2c);

    while(hi2c->XferSize > 0U)

    {

      /* Wait until TXE flag is set */

      if(I2C_WaitOnTXEFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)

      {

        if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)

        {

          /* Generate Stop */

          hi2c->Instance->CR1 |= I2C_CR1_STOP;

          return HAL_ERROR;

        }

        else

        {

          return HAL_TIMEOUT;

        }

      }

      /* Write data to DR */

      hi2c->Instance->DR = (*hi2c->pBuffPtr++);

      hi2c->XferCount--;

      hi2c->XferSize--;

      if((__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BTF) == SET) && (hi2c->XferSize != 0U))

      {

        /* Write data to DR */

        hi2c->Instance->DR = (*hi2c->pBuffPtr++);

        hi2c->XferCount--;

        hi2c->XferSize--;

      }

      /* Wait until BTF flag is set */

      if(I2C_WaitOnBTFFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)

      {

        if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)

        {

          /* Generate Stop */

          hi2c->Instance->CR1 |= I2C_CR1_STOP;

          return HAL_ERROR;

        }

        else

        {

          return HAL_TIMEOUT;

        }

      }

    }

    /* Generate Stop */

    hi2c->Instance->CR1 |= I2C_CR1_STOP;

    hi2c->State = HAL_I2C_STATE_READY;

    hi2c->Mode = HAL_I2C_MODE_NONE;

    /* Process Unlocked */

    __HAL_UNLOCK(hi2c);

    return HAL_OK;

  }

  else

  {

    return HAL_BUSY;

  }

}

/**

  * @brief  Receives in master mode an amount of data in blocking mode.

  * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains

  *                the configuration information for the specified I2C.

  * @param  DevAddress Target device address: The device 7 bits address value

  *         in datasheet must be shifted to the left before calling the interface

  * @param  pData Pointer to data buffer

  * @param  Size Amount of data to be sent

  * @param  Timeout Timeout duration

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_I2C_Master_Receive(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout)

{

  uint32_t tickstart = 0x00U;

  /* Init tickstart for timeout management*/

  tickstart = HAL_GetTick();

  if(hi2c->State == HAL_I2C_STATE_READY)

  {

    /* Wait until BUSY flag is reset */

    if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, I2C_TIMEOUT_BUSY_FLAG, tickstart) != HAL_OK)

    {

      return HAL_BUSY;

    }

    /* Process Locked */

    __HAL_LOCK(hi2c);

    /* Check if the I2C is already enabled */

    if((hi2c->Instance->CR1 & I2C_CR1_PE) != I2C_CR1_PE)

    {

      /* Enable I2C peripheral */

      __HAL_I2C_ENABLE(hi2c);

    }

    /* Disable Pos */

    hi2c->Instance->CR1 &= ~I2C_CR1_POS;

    hi2c->State       = HAL_I2C_STATE_BUSY_RX;

    hi2c->Mode        = HAL_I2C_MODE_MASTER;

    hi2c->ErrorCode   = HAL_I2C_ERROR_NONE;

    /* Prepare transfer parameters */

    hi2c->pBuffPtr    = pData;

    hi2c->XferCount   = Size;

    hi2c->XferOptions = I2C_NO_OPTION_FRAME;

    hi2c->XferSize    = hi2c->XferCount;

    /* Send Slave Address */

    if(I2C_MasterRequestRead(hi2c, DevAddress, Timeout, tickstart) != HAL_OK)

    {

      if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)

      {

        /* Process Unlocked */

        __HAL_UNLOCK(hi2c);

        return HAL_ERROR;

      }

      else

      {

        /* Process Unlocked */

        __HAL_UNLOCK(hi2c);

        return HAL_TIMEOUT;

      }

    }

    if(hi2c->XferSize == 0U)

    {

      /* Clear ADDR flag */

      __HAL_I2C_CLEAR_ADDRFLAG(hi2c);

      /* Generate Stop */

      hi2c->Instance->CR1 |= I2C_CR1_STOP;

    }

    else if(hi2c->XferSize == 1U)

    {

      /* Disable Acknowledge */

      hi2c->Instance->CR1 &= ~I2C_CR1_ACK;

      /* Disable all active IRQs around ADDR clearing and STOP programming because the EV6_3

      software sequence must complete before the current byte end of transfer */

      __disable_irq();

      /* Clear ADDR flag */

      __HAL_I2C_CLEAR_ADDRFLAG(hi2c);

      /* Generate Stop */

      hi2c->Instance->CR1 |= I2C_CR1_STOP;

      /* Re-enable IRQs */

      __enable_irq();

    }

    else if(hi2c->XferSize == 2U)

    {

      /* Enable Pos */

      hi2c->Instance->CR1 |= I2C_CR1_POS;

      /* Disable all active IRQs around ADDR clearing and STOP programming because the EV6_3

      software sequence must complete before the current byte end of transfer */

      __disable_irq();

      /* Clear ADDR flag */

      __HAL_I2C_CLEAR_ADDRFLAG(hi2c);

      /* Disable Acknowledge */

      hi2c->Instance->CR1 &= ~I2C_CR1_ACK;

      /* Re-enable IRQs */

      __enable_irq();

    }

    else

    {

      /* Enable Acknowledge */

      hi2c->Instance->CR1 |= I2C_CR1_ACK;

      /* Clear ADDR flag */

      __HAL_I2C_CLEAR_ADDRFLAG(hi2c);

    }

    while(hi2c->XferSize > 0U)

    {

      if(hi2c->XferSize <= 3U)

      {

        /* One byte */

        if(hi2c->XferSize == 1U)

        {

          /* Wait until RXNE flag is set */

          if(I2C_WaitOnRXNEFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)      

          {

            if(hi2c->ErrorCode == HAL_I2C_ERROR_TIMEOUT)

            {

              return HAL_TIMEOUT;

            }

            else

            {

              return HAL_ERROR;

            }

          }

          /* Read data from DR */

          (*hi2c->pBuffPtr++) = hi2c->Instance->DR;

          hi2c->XferSize--;

          hi2c->XferCount--;

        }

        /* Two bytes */

        else if(hi2c->XferSize == 2U)

        {

          /* Wait until BTF flag is set */

          if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BTF, RESET, Timeout, tickstart) != HAL_OK)

          {

            return HAL_TIMEOUT;

          }

          /* Disable all active IRQs around ADDR clearing and STOP programming because the EV6_3

             software sequence must complete before the current byte end of transfer */

           __disable_irq();

          /* Generate Stop */

          hi2c->Instance->CR1 |= I2C_CR1_STOP;

          /* Read data from DR */

          (*hi2c->pBuffPtr++) = hi2c->Instance->DR;

          hi2c->XferSize--;

          hi2c->XferCount--;

          /* Re-enable IRQs */

          __enable_irq();

          /* Read data from DR */

          (*hi2c->pBuffPtr++) = hi2c->Instance->DR;

          hi2c->XferSize--;

          hi2c->XferCount--;

        }

        /* 3 Last bytes */

        else

        {

          /* Wait until BTF flag is set */

          if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BTF, RESET, Timeout, tickstart) != HAL_OK)

          {

            return HAL_TIMEOUT;

          }

          /* Disable Acknowledge */

          hi2c->Instance->CR1 &= ~I2C_CR1_ACK;

          /* Disable all active IRQs around ADDR clearing and STOP programming because the EV6_3

             software sequence must complete before the current byte end of transfer */

          __disable_irq();

          /* Read data from DR */

          (*hi2c->pBuffPtr++) = hi2c->Instance->DR;