Hal_lib/src/HAL_i2c.c

/**
******************************************************************************
* @file  HAL_i2c.c
* @author  IC Applications Department
* @version  V0.8
* @date  2019_08_02
* @brief  This file provides all the I2C firmware functions.
******************************************************************************
* @copy
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, HOLOCENE SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>&copy; COPYRIGHT 2016 HOLOCENE</center></h2>
*/

/* Includes ------------------------------------------------------------------*/
#include "HAL_i2c.h"
#include "HAL_rcc.h"


/** @addtogroup StdPeriph_Driver
* @{
*/

/** @defgroup I2C
* @brief I2C driver modules
* @{
*/

/** @defgroup I2C_Private_TypesDefinitions
* @{
*/

/**
* @}
*/

/** @defgroup I2C_Private_Defines
* @{
*/

/*I2c Enable disable*/
#define IC_ENABLE_Reset         ((uint16_t)0xFFFE)
#define IC_ENABLE_Set           ((uint16_t)0x0001)
#define IC_CON_RESET                        ((uint16_t)0xFE8A)
#define INTR_MASK               ((uint16_t)0xC000)

/*I2c DMA  reset*/
#define DMA_CR_TDMAE_RDMAE_Reset ((uint16_t)0xFFFC)

/* I2C START mask */
#define IC_CON_START_Set           ((uint16_t)0x0020)
#define IC_CON_START_Reset         ((uint16_t)0xFFDF)

/* I2C STOP mask */
#define IC_DATA_CMD_STOP_Set     ((uint16_t)0x0200)
#define IC_DATA_CMD_STOP_Reset   ((uint16_t)0xFDFF)

/* I2C ADD2 mask */
#define IC_TAR_Reset         ((uint16_t)0xFF00)

/* I2C IC_10BITADDR_MASTER bit mask */
#define IC_TAR_ENDUAL_Set         ((uint16_t)0x1000)
#define IC_TAR_ENDUAL_Reset       ((uint16_t)0xEFFF)

/* I2C SPECIAL、GC_OR_START bits mask */
#define IC_TAR_GC_Set            ((uint16_t)0x0800)
#define IC_TAR_GC_Reset          ((uint16_t)0xF7FF)

/* I2C FLAG mask */
#define FLAG_Mask               ((uint32_t)0x00793FFF)

//static
 uint8_t I2C_CMD_DIR = 0;

/*新增加的用户变量，外部调用时需要更新该变量值*/
uint16_t I2C_DMA_DIR = 0;

/**
* @}
*/

/** @defgroup I2C_Private_Macros
* @{
*/

/**
* @}
*/

/** @defgroup I2C_Private_Variables
* @{
*/

/**
* @}
*/

/** @defgroup I2C_Private_FunctionPrototypes
* @{
*/

/**
* @}
*/

/** @defgroup I2C_Private_Functions
* @{
*/

/**
* @brief  Deinitializes the I2Cx peripheral registers to their default
*   reset values.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @retval : None
*/
void I2C_DeInit(I2C_TypeDef* I2Cx)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  switch (*(uint32_t*)&I2Cx)
  {
  case I2C1_BASE:
    /* Enable I2C1 reset state */
    RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
    /* Release I2C1 from reset state */
    RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
    break;

  default:
    break;
  }
}

/**
* @brief  Initializes the I2Cx peripheral according to the specified
*   parameters in the I2C_InitStruct.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_InitStruct: pointer to a I2C_InitTypeDef structure that
*   contains the configuration information for the specified
*   I2C peripheral.
* @retval : None
*/
void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
{

  uint16_t tmpreg = 0;
  uint32_t pclk1 = 8000000;
  uint32_t minSclLowTime = 0;
  uint32_t i2cPeriod = 0;
  uint32_t pclk1Period = 0;
  RCC_ClocksTypeDef  rcc_clocks;
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
  assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));
  /*---------------------------- I2Cx IC_ENABLE Configuration ------------------------*/
  /* Disable the selected I2C peripheral */
  I2Cx->IC_ENABLE &= IC_ENABLE_Reset;

  /* Get pclk1 frequency value */
  RCC_GetClocksFreq(&rcc_clocks);
  pclk1 = rcc_clocks.PCLK1_Frequency;

  /* Set pclk1 period value */
  pclk1Period = 1000000000/pclk1;

  i2cPeriod = 1000000000/I2C_InitStruct->I2C_ClockSpeed; //ns unit
  tmpreg = 0;

    /*Get the I2Cx IC_CON value */
  tmpreg = I2Cx->IC_CON;
  /*Clear TX_EMPTY_CTRL,IC_SLAVE_DISABLE,IC_RESTART_EN,IC_10BITADDR_SLAVE,SPEED,MASTER_MODE bits*/
  tmpreg &= IC_CON_RESET;

  /* Configure speed in standard mode */
  if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
  {
    minSclLowTime = i2cPeriod/pclk1Period;
        I2Cx->IC_SS_SCL_LCNT = minSclLowTime/2;
        I2Cx->IC_SS_SCL_HCNT = minSclLowTime - I2Cx->IC_SS_SCL_LCNT;
        I2C_InitStruct->I2C_Speed = I2C_Speed_STANDARD;
  }
  else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
  {
        minSclLowTime = i2cPeriod/pclk1Period;
        I2Cx->IC_FS_SCL_LCNT = minSclLowTime/2;
        I2Cx->IC_FS_SCL_HCNT = minSclLowTime - I2Cx->IC_FS_SCL_LCNT;
        I2C_InitStruct->I2C_Speed = I2C_Speed_FAST;
  }


  /*Set TX_EMPTY_CTRL,IC_SLAVE_DISABLE,IC_RESTART_EN,IC_10BITADDR_SLAVE,SPEED,MASTER_MODE bits*/
  tmpreg = TX_EMPTY_CTRL | IC_SLAVE_DISABLE | IC_RESTART_EN |IC_7BITADDR_MASTER | I2C_InitStruct->I2C_Speed | I2C_InitStruct->I2C_Mode;
  /* Write to I2Cx IC_CON */
  I2Cx->IC_CON = tmpreg;

  /*---------------------------- I2Cx IC_INTR_MASK Configuration ------------------------*/
  /* Get the I2Cx IC_INTR_MASK value */
  tmpreg = I2Cx->IC_INTR_MASK;
  /* clear the I2Cx IC_INTR_MASK value */
  tmpreg &= INTR_MASK;
  /* Write to IC_INTR_MASK */
  I2Cx->IC_INTR_MASK = tmpreg;

  /* Write to IC_RX_TL  */
  I2Cx->IC_RX_TL = 0x0; //rxfifo depth is 1
  /* Write to IC_TX_TL  */
  I2Cx->IC_TX_TL = 0x1; //tcfifo depth is 1

}

/**
* @brief  Fills each I2C_InitStruct member with its default value.
* @param I2C_InitStruct: pointer to an I2C_InitTypeDef structure
*   which will be initialized.
* @retval : None
*/
void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct)
{
  /*---------------- Reset I2C init structure parameters values ----------------*/
  /* Initialize the I2C_Mode member */
  I2C_InitStruct->I2C_Mode = I2C_Mode_MASTER;
  /* Initialize the I2C_OwnAddress member */
  I2C_InitStruct->I2C_OwnAddress = 0xA8;
  /* Initialize the I2C_Speed member */
  I2C_InitStruct->I2C_Speed = I2C_Speed_STANDARD;
  /* initialize the I2C_ClockSpeed member */
  I2C_InitStruct->I2C_ClockSpeed = 100000;
}

/**
* @brief  Enables or disables the specified I2C peripheral.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param NewState: new state of the I2Cx peripheral. This parameter
*   can be: ENABLE or DISABLE.
* @retval : None
*/
void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the selected I2C peripheral */
    I2Cx->IC_ENABLE |= IC_ENABLE_Set;
  }
  else
  {
    /* Disable the selected I2C peripheral */
    I2Cx->IC_ENABLE &= IC_ENABLE_Reset;
  }
}

/**
* @brief  Enables or disables the specified I2C DMA requests.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param    DMA_Direcction : TDMAE_SET,RDMAE_SET
*   This parameter can be any combination of the following values:
* @arg TDMAE_SET    :DMA TX set
* @arg RDMAE_SET    :DMA RX set
* @param NewState: new state of the I2C DMA transfer.
*   This parameter can be: ENABLE or DISABLE.
* @retval : None
*/
void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the selected I2C DMA requests */
    if(I2C_DMA_DIR==TDMAE_SET)
    {
      /* Enable the selected I2C TX DMA requests */
      I2Cx->IC_DMA_CR |= TDMAE_SET;
    }
    else if(I2C_DMA_DIR==RDMAE_SET)
    {
      /* Enable the selected I2C TX DMA requests */
      I2Cx->IC_DMA_CR |= RDMAE_SET;
    }
  }
  else
  {
    /* Disable the selected I2C DMA requests */
    I2Cx->IC_DMA_CR &= DMA_CR_TDMAE_RDMAE_Reset;
  }
}


/**
* @brief  Generates I2Cx communication START condition.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param NewState: new state of the I2C START condition generation.
*   This parameter can be: ENABLE or DISABLE.
* @retval : None.
*/
void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Generate a START condition */
    I2Cx->IC_CON |= IC_CON_START_Set;
  }
  else
  {
    /* Disable the START condition generation */
    I2Cx->IC_CON &= IC_CON_START_Reset;
  }
}

/**
* @brief  Generates I2Cx communication STOP condition.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param NewState: new state of the I2C STOP condition generation.
*   This parameter can be: ENABLE or DISABLE.
* @retval : None.
*/
void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Generate a STOP condition */
    I2Cx->IC_DATA_CMD |= IC_DATA_CMD_STOP_Set;
  }
  else
  {
    /* Disable the STOP condition generation */
    I2Cx->IC_DATA_CMD &= IC_DATA_CMD_STOP_Reset;
  }
}

/**
* @brief  Configures the specified I2C own address2.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param Address: specifies the 7bit I2C own address2.
* @retval : None.
*/
void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address)
//void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint16_t Address)
{
  uint16_t tmpreg = 0;
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  /* Get the old register value */
  tmpreg = I2Cx->IC_TAR;
  /* Reset I2Cx Own address2 bit [7:0] */
  tmpreg &= IC_TAR_Reset;
  /* Set I2Cx Own address2 */
  tmpreg |= Address>>1;
  /* Store the new register value */
  I2Cx->IC_TAR = tmpreg;
}

/**
* @brief  Enables or disables the specified I2C dual addressing mode.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param NewState: new state of the I2C dual addressing mode.
*   This parameter can be: ENABLE or DISABLE.
* @retval : None
*/
void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable dual addressing mode */
    I2Cx->IC_TAR |= IC_TAR_ENDUAL_Set;
  }
  else
  {
    /* Disable dual addressing mode */
    I2Cx->IC_TAR &= IC_TAR_ENDUAL_Reset;
  }
}

/**
* @brief  Enables or disables the specified I2C general call feature.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param NewState: new state of the I2C General call.
*   This parameter can be: ENABLE or DISABLE.
* @retval : None
*/
void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable generall call */
    I2Cx->IC_TAR |= IC_TAR_GC_Set;
  }
  else
  {
    /* Disable generall call */
    I2Cx->IC_TAR &= IC_TAR_GC_Reset;
  }
}

/**
* @brief  Enables or disables the specified I2C interrupts.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_IT: specifies the I2C interrupts sources to be enabled
*   or disabled.
*   This parameter can be any combination of the following values:
* @arg I2C_IT_RX_UNDER: Rx Buffer is empty interrupt mask
* @arg I2C_IT_RX_OVER : RX  Buffer Overrun interrupt mask
* @arg I2C_IT_RX_FULL : Rx buffer full interrupt mask
* @arg I2C_IT_TX_OVER : TX  Buffer Overrun interrupt mask
* @arg I2C_IT_TX_EMPTY  : TX_FIFO empty interrupt mask
* @arg I2C_IT_RD_REQ    : I2C work as slave or master interrupt mask
* @arg I2C_IT_TX_ABRT   : TX error interrupt  mask(Master mode)
* @arg I2C_IT_RX_DONE   : Master not ack interrupt mask(slave mode)
* @arg I2C_IT_ACTIVITY  : I2C activity interrupt mask
* @arg I2C_IT_STOP_DET  : stop condition  interrupt mask
* @arg I2C_IT_START_DET : start condition  interrupt mask
* @arg I2C_IT_GEN_CALL  : a general call address and ack interrupt mask
* @param NewState: new state of the specified I2C interrupts.
*   This parameter can be: ENABLE or DISABLE.
* @retval : None
*/
void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_I2C_CONFIG_IT(I2C_IT));

  if(I2C_IT == I2C_IT_RX_FULL)
  {
    I2C1->IC_DATA_CMD = CMD_READ;
  }

  if (NewState != DISABLE)
  {
    /* Enable the selected I2C interrupts */
    I2Cx->IC_INTR_MASK |= I2C_IT;
  }
  else
  {
    /* Disable the selected I2C interrupts */
    I2Cx->IC_INTR_MASK &= (uint16_t)~I2C_IT;
  }
}

/**
* @brief  Sends a data byte through the I2Cx peripheral.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param Data: Byte to be transmitted..
* @retval : None
*/
void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  /* Write in the IC_DATA_CMD register the data to be sent */
  I2Cx->IC_DATA_CMD = CMD_WRITE | Data;
}

/**
* @brief  Returns the most recent received data by the I2Cx peripheral.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @retval : The value of the received data.

*/
void I2C_ReadCmd(I2C_TypeDef* I2Cx)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));

  I2Cx->IC_DATA_CMD = CMD_READ;
}

/**
* @brief  Returns the most recent received data by the I2Cx peripheral.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @retval : The value of the received data.
*/
uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  I2C_CMD_DIR= 0;
  /* Return the data in the IC_DATA_CMD register */
  return (uint8_t)I2Cx->IC_DATA_CMD;
}

/**
* @brief  Transmits the address byte to select the slave device.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param Address: specifies the slave address which will be transmitted
* @param I2C_Direction: specifies whether the I2C device will be a
*   Transmitter or a Receiver.
*   This parameter can be one of the following values
* @arg I2C_Direction_Transmitter: Transmitter mode
* @arg I2C_Direction_Receiver: Receiver mode
* @retval : None.
*/
void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction)
{
  /* Store the new register value */
  I2Cx->IC_TAR = Address>>1;
}

/**
* @brief  Reads the specified I2C register and returns its value.
* @param I2C_Register: specifies the register to read.
*   This parameter can be one of the following values:
* @retval : The value of the read register.
*/
uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_I2C_REGISTER(I2C_Register));
  /* Return the selected register value */
  return (*(__IO uint16_t *)(*((__IO uint32_t *)&I2Cx) + I2C_Register));
}

/**
* @brief  Returns the last I2Cx Event.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @retval : The last event
*/
uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx)
{
  uint32_t lastevent = 0;
  uint32_t flag1 = 0;
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  /* Read the I2Cx status register */
  flag1 = I2Cx->IC_RAW_INTR_STAT;

  /* Get the last event value from I2C status register */
  lastevent = (flag1 ) & FLAG_Mask;
  /* Return status */
  return lastevent;
}


/**
* @brief  Checks whether the last I2Cx Event is equal to the one passed
*   as parameter.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_EVENT: specifies the event to be checked.
*   This parameter can be one of the following values:
* @arg I2C_EVENT_RX_UNDER: Rx Buffer is empty event
* @arg I2C_EVENT_RX_OVER : RX  Buffer Overrun event
* @arg I2C_EVENTT_RX_FULL : Rx buffer full event
* @arg I2C_EVENT_TX_OVER : TX  Buffer Overrun event
* @arg I2C_EVENT_TX_EMPTY   : TX_FIFO empty event
* @arg I2C_EVENT_RD_REQ : I2C work as slave or master event
* @arg I2C_EVENT_TX_ABRT    : TX error event(Master mode)
* @arg I2C_EVENT_RX_DONE    : Master not ack event(slave mode)
* @arg I2C_EVENT_ACTIVITY   : I2C activity event
* @arg I2C_EVENT_STOP_DET   : stop condition  event
* @arg I2C_EVENT_START_DET  : start condition  event
* @arg I2C_EVENT_GEN_CALL   : a general call address and ack event
* - SUCCESS: Last event is equal to the I2C_EVENT
* - ERROR: Last event is different from the I2C_EVENT
*/
ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT)
{
  uint32_t lastevent = 0;
  uint32_t flag1 = 0;
  ErrorStatus status = ERROR;
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_I2C_EVENT(I2C_EVENT));

  if((I2C_EVENT == I2C_EVENT_RX_FULL)&&(I2C_CMD_DIR==0))
  {
    I2C1->IC_DATA_CMD = CMD_READ;
    I2C_CMD_DIR = 1;
  }
  /* Read the I2Cx status register */
  flag1 = I2Cx->IC_RAW_INTR_STAT;
  //flag1 = I2Cx->IC_INTR_STAT;
  /* Get the last event value from I2C status register */
  lastevent = (flag1 ) & I2C_EVENT;

  /* Check whether the last event is equal to I2C_EVENT */
  if (lastevent == I2C_EVENT )
    //if((I2Cx->IC_RAW_INTR_STAT & I2C_EVENT) != (uint32_t)RESET)
  {
    /* SUCCESS: last event is equal to I2C_EVENT */
    status = SUCCESS;
  }
  else
  {
    /* ERROR: last event is different from I2C_EVENT */
    status = ERROR;
  }
  /* Return status */
  return status;

}

/**
* @brief  Checks whether the specified I2C flag is set or not.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_FLAG: specifies the flag to check.
*   This parameter can be one of the following values:
* @arg I2C_FLAG_RX_UNDER: Rx Buffer is empty flag
* @arg I2C_FLAG_RX_OVER : RX  Buffer Overrun flag
* @arg I2C_FLAG_RX_FULL : Rx buffer full flag
* @arg I2C_FLAG_TX_OVER : TX  Buffer Overrun flag
* @arg I2C_FLAG_TX_EMPTY: TX_FIFO empty flag
* @arg I2C_FLAG_RD_REQ  : I2C work as slave or master flag
* @arg I2C_FLAG_TX_ABRT : TX error flag(Master mode)
* @arg I2C_FLAG_RX_DONE : Master not ack flag(slave mode)
* @arg I2C_FLAG_ACTIVITY: I2C activity flag
* @arg I2C_FLAG_STOP_DET: stop condition  flag
* @arg I2C_FLAG_START_DET: start condition  flag
* @arg I2C_FLAG_GEN_CALL : a general call address and ack flag
* @retval : The new state of I2C_FLAG (SET or RESET).
*/
FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
{
  FlagStatus bitstatus = RESET;
  __IO uint32_t i2creg = 0, i2cxbase = 0;
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_I2C_GET_FLAG(I2C_FLAG));
  /* Check the status of the specified I2C flag and set I2C direction*/
  if((I2C_FLAG == I2C_FLAG_RX_FULL)&&(I2C_CMD_DIR==0))
  {
    I2Cx->IC_DATA_CMD = CMD_READ;
    I2C_CMD_DIR = 1;
  }

  /* Check the status of the specified I2C flag */
  if((I2Cx->IC_RAW_INTR_STAT & I2C_FLAG) != (uint32_t)RESET)
  {
    /* I2C_FLAG is set */
    bitstatus = SET;
  }
  else
  {
    /* I2C_FLAG is reset */
    bitstatus = RESET;
  }

  /* Return the I2C_FLAG status */
  return  bitstatus;
}

/**
* @brief  Clears the I2Cx's pending flags.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_FLAG: specifies the flag to clear.
*   This parameter can be any combination of the following values:
* @arg I2C_FLAG_RX_UNDER: Rx Buffer is empty flag
* @arg I2C_FLAG_RX_OVER : RX  Buffer Overrun flag
* @arg I2C_FLAG_RX_FULL : Rx buffer full flag
* @arg I2C_FLAG_TX_OVER : TX  Buffer Overrun flag
* @arg I2C_FLAG_TX_EMPTY: TX_FIFO empty flag
* @arg I2C_FLAG_RD_REQ  : I2C work as slave or master flag
* @arg I2C_FLAG_TX_ABRT : TX error flag(Master mode)
* @arg I2C_FLAG_RX_DONE : Master not ack flag(slave mode)
* @arg I2C_FLAG_ACTIVITY: I2C activity flag
* @arg I2C_FLAG_STOP_DET: stop condition  flag
* @arg I2C_FLAG_START_DET: start condition  flag
* @arg I2C_FLAG_GEN_CALL : a general call address and ack flag
* @retval : None
*/
void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
{
  __IO uint32_t i2creg = 0, i2cxbase = 0;
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG));
  /* Get the I2Cx peripheral base address */
  i2cxbase = (*(uint32_t*)&(I2Cx));

  if(I2C_FLAG==I2C_FLAG_RX_UNDER)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x44;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_RX_UNDER = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_RX_OVER)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x48;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_RX_OVER = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_TX_OVER)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x4C;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_TX_OVER = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_RD_REQ)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x50;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_RD_REQ = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_TX_ABRT)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x54;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_TX_ABRT = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_RX_DONE)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x58;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_RX_DONE = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_ACTIVITY)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x5C;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_ACTIVITY = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_STOP_DET)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x60;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_STOP_DET = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_START_DET)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x64;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_START_DET = (uint16_t)I2C_FLAG;
  }
  if(I2C_FLAG==I2C_FLAG_GEN_CALL)
  {
    /* Get the I2Cx SR1 register address */
    i2cxbase += 0x68;
    /* Clear the selected I2C flag */
    I2Cx->IC_CLR_GEN_CALL = (uint16_t)I2C_FLAG;
  }
}

/**
* @brief  Checks whether the specified I2C interrupt has occurred or not.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_IT: specifies the interrupt source to check.
*   This parameter can be one of the following values:
* @arg I2C_IT_RX_UNDER: Rx Buffer is empty interrupt
* @arg I2C_IT_RX_OVER : RX  Buffer Overrun interrupt
* @arg I2C_IT_RX_FULL : Rx buffer full interrupt
* @arg I2C_IT_TX_OVER : TX  Buffer Overrun interrupt
* @arg I2C_IT_TX_EMPTY  : TX_FIFO empty interrupt
* @arg I2C_IT_RD_REQ    : I2C work as slave or master interrupt
* @arg I2C_IT_TX_ABRT   : TX error interrupt  (Master mode)
* @arg I2C_IT_RX_DONE   : Master not ack interrupt (slave mode)
* @arg I2C_IT_ACTIVITY  : I2C activity interrupt
* @arg I2C_IT_STOP_DET  : stop condition  interrupt
* @arg I2C_IT_START_DET : start condition  interrupt
* @arg I2C_IT_GEN_CALL  : a general call address and ack interrupt
* @retval : The new state of I2C_IT (SET or RESET).
*/
ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
{
  ITStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_I2C_GET_IT(I2C_IT));

  /* Check the status of the specified I2C flag */
  if((I2Cx->IC_RAW_INTR_STAT & I2C_IT) != (uint32_t)RESET)
  {
    /* I2C_IT is set */
    bitstatus = SET;
  }
  else
  {
    /* I2C_IT is reset */
    bitstatus = RESET;
  }

  /* Return the I2C_IT status */
  return  bitstatus;
}

/**
* @brief  Clears the I2Cx interrupt pending bits.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_IT: specifies the interrupt pending bit to clear.
*   This parameter can be any combination of the following values:
* @arg I2C_IT_RX_UNDER: Rx Buffer is empty interrupt
* @arg I2C_IT_RX_OVER : RX  Buffer Overrun interrupt
* @arg I2C_IT_RX_FULL : Rx buffer full interrupt
* @arg I2C_IT_TX_OVER : TX  Buffer Overrun interrupt
* @arg I2C_IT_TX_EMPTY  : TX_FIFO empty interrupt
* @arg I2C_IT_RD_REQ    : I2C work as slave or master interrupt
* @arg I2C_IT_TX_ABRT   : TX error interrupt  (Master mode)
* @arg I2C_IT_RX_DONE   : Master not ack interrupt (slave mode)
* @arg I2C_IT_ACTIVITY  : I2C activity interrupt
* @arg I2C_IT_STOP_DET  : stop condition  interrupt
* @arg I2C_IT_START_DET : start condition  interrupt
* @arg I2C_IT_GEN_CALL  : a general call address and ack interrupt
* @retval : None
*/
void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
{
  /* Check the parameters */
  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
  assert_param(IS_I2C_CLEAR_IT(I2C_IT));

  /* Clear the selected I2C flag */
  I2Cx->IC_INTR_MASK &= (uint16_t)~I2C_IT;
}

/**
* @}
*/

/**
* @}
*/

/**
* @}
*/
/*-------------------------(C) COPYRIGHT 2016 HOLOCENE ----------------------*/