text: /**
    ******************************************************************************
    * @file    stm32746g_discovery.c
    * @author  MCD Application Team
    * @brief   This file provides a set of firmware functions to manage LEDs,
    *          push-buttons and COM ports available on STM32746G-Discovery
    *          board(MB1191) from STMicroelectronics.
    ******************************************************************************
    * @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.
    *
    ******************************************************************************
    */
  
  /* Dependencies
  - stm32f7xx_hal_cortex.c
  - stm32f7xx_hal_gpio.c
  - stm32f7xx_hal_uart.c
  - stm32f7xx_hal_i2c.c
  EndDependencies */
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32746g_discovery.h"
  
  /** @addtogroup BSP
    * @{
    */
  
  /** @addtogroup STM32746G_DISCOVERY
    * @{
    */
  
  /** @defgroup STM32746G_DISCOVERY_LOW_LEVEL STM32746G_DISCOVERY_LOW_LEVEL
    * @{
    */
  
  /** @defgroup STM32746G_DISCOVERY_LOW_LEVEL_Private_TypesDefinitions STM32746G_DISCOVERY_LOW_LEVEL Private Types Definitions
    * @{
    */
  /**
    * @}
    */
  
  /** @defgroup STM32746G_DISCOVERY_LOW_LEVEL_Private_Defines STM32746G_DISCOVERY_LOW_LEVEL Private Defines
    * @{
    */
  /**
   * @brief STM32746G DISCOVERY BSP Driver version number V2.0.2
     */
  #define __STM32746G_DISCO_BSP_VERSION_MAIN   (0x02) /*!< [31:24] main version */
  #define __STM32746G_DISCO_BSP_VERSION_SUB1   (0x00) /*!< [23:16] sub1 version */
  #define __STM32746G_DISCO_BSP_VERSION_SUB2   (0x02) /*!< [15:8]  sub2 version */
  #define __STM32746G_DISCO_BSP_VERSION_RC     (0x00) /*!< [7:0]  release candidate */
  #define __STM32746G_DISCO_BSP_VERSION         ((__STM32746G_DISCO_BSP_VERSION_MAIN << 24)\
                                               |(__STM32746G_DISCO_BSP_VERSION_SUB1 << 16)\
                                               |(__STM32746G_DISCO_BSP_VERSION_SUB2 << 8 )\
                                               |(__STM32746G_DISCO_BSP_VERSION_RC))
  /**
    * @}
    */
  
  /** @defgroup STM32746G_DISCOVERY_LOW_LEVEL_Private_Macros STM32746G_DISCOVERY_LOW_LEVEL Private Macros
    * @{
    */
  /**
    * @}
    */
  
  /** @defgroup STM32746G_DISCOVERY_LOW_LEVEL_Private_Variables STM32746G_DISCOVERY_LOW_LEVEL Private Variables
    * @{
    */
  
  const uint32_t GPIO_PIN[LEDn] = {LED1_PIN};
  
  GPIO_TypeDef* BUTTON_PORT[BUTTONn] = {WAKEUP_BUTTON_GPIO_PORT,
                                        TAMPER_BUTTON_GPIO_PORT,
                                        KEY_BUTTON_GPIO_PORT};
  
  const uint16_t BUTTON_PIN[BUTTONn] = {WAKEUP_BUTTON_PIN,
                                        TAMPER_BUTTON_PIN,
                                        KEY_BUTTON_PIN};
  
  const uint16_t BUTTON_IRQn[BUTTONn] = {WAKEUP_BUTTON_EXTI_IRQn,
                                         TAMPER_BUTTON_EXTI_IRQn,
                                         KEY_BUTTON_EXTI_IRQn};
  
  USART_TypeDef* COM_USART[COMn] = {DISCOVERY_COM1};
  
  GPIO_TypeDef* COM_TX_PORT[COMn] = {DISCOVERY_COM1_TX_GPIO_PORT};
  
  GPIO_TypeDef* COM_RX_PORT[COMn] = {DISCOVERY_COM1_RX_GPIO_PORT};
  
  const uint16_t COM_TX_PIN[COMn] = {DISCOVERY_COM1_TX_PIN};
  
  const uint16_t COM_RX_PIN[COMn] = {DISCOVERY_COM1_RX_PIN};
  
  const uint16_t COM_TX_AF[COMn] = {DISCOVERY_COM1_TX_AF};
  
  const uint16_t COM_RX_AF[COMn] = {DISCOVERY_COM1_RX_AF};
  
  static I2C_HandleTypeDef hI2cAudioHandler = {0};
  static I2C_HandleTypeDef hI2cExtHandler = {0};
  
  /**
    * @}
    */
  
  /** @defgroup STM32746G_DISCOVERY_LOW_LEVEL_Private_FunctionPrototypes STM32746G_DISCOVERY_LOW_LEVEL Private Function Prototypes
    * @{
    */
  static void     I2Cx_MspInit(I2C_HandleTypeDef *i2c_handler);
  static void     I2Cx_Init(I2C_HandleTypeDef *i2c_handler);
  
  static HAL_StatusTypeDef I2Cx_ReadMultiple(I2C_HandleTypeDef *i2c_handler, uint8_t Addr, uint16_t Reg, uint16_t MemAddSize, uint8_t *Buffer, uint16_t Length);
  static HAL_StatusTypeDef I2Cx_WriteMultiple(I2C_HandleTypeDef *i2c_handler, uint8_t Addr, uint16_t Reg, uint16_t MemAddSize, uint8_t *Buffer, uint16_t Length);
  static HAL_StatusTypeDef I2Cx_IsDeviceReady(I2C_HandleTypeDef *i2c_handler, uint16_t DevAddress, uint32_t Trials);
  static void              I2Cx_Error(I2C_HandleTypeDef *i2c_handler, uint8_t Addr);
  
  /* AUDIO IO functions */
  void            AUDIO_IO_Init(void);
  void            AUDIO_IO_DeInit(void);
  void            AUDIO_IO_Write(uint8_t Addr, uint16_t Reg, uint16_t Value);
  uint16_t        AUDIO_IO_Read(uint8_t Addr, uint16_t Reg);
  void            AUDIO_IO_Delay(uint32_t Delay);
  
  /* TOUCHSCREEN IO functions */
  void            TS_IO_Init(void);
  void            TS_IO_Write(uint8_t Addr, uint8_t Reg, uint8_t Value);
  uint8_t         TS_IO_Read(uint8_t Addr, uint8_t Reg);
  void            TS_IO_Delay(uint32_t Delay);
  
  /* CAMERA IO functions */
  void            CAMERA_IO_Init(void);
  void            CAMERA_Delay(uint32_t Delay);
  void            CAMERA_IO_Write(uint8_t Addr, uint8_t Reg, uint8_t Value);
  uint8_t         CAMERA_IO_Read(uint8_t Addr, uint8_t Reg);
  
  /* I2C EEPROM IO function */
  void                EEPROM_IO_Init(void);
  HAL_StatusTypeDef   EEPROM_IO_WriteData(uint16_t DevAddress, uint16_t MemAddress, uint8_t* pBuffer, uint32_t BufferSize);
  HAL_StatusTypeDef   EEPROM_IO_ReadData(uint16_t DevAddress, uint16_t MemAddress, uint8_t* pBuffer, uint32_t BufferSize);
  HAL_StatusTypeDef   EEPROM_IO_IsDeviceReady(uint16_t DevAddress, uint32_t Trials);
  /**
    * @}
    */
  
  /** @defgroup STM32746G_DISCOVERY_LOW_LEVEL_Exported_Functions STM32746G_DISCOVERY_LOW_LEVELSTM32746G_DISCOVERY_LOW_LEVEL Exported Functions
    * @{
    */
  
    /**
    * @brief  This method returns the STM32746G DISCOVERY BSP Driver revision
    * @retval version: 0xXYZR (8bits for each decimal, R for RC)
    */
  uint32_t BSP_GetVersion(void)
  {
    return __STM32746G_DISCO_BSP_VERSION;
  }
  
  /**
    * @brief  Configures LED on GPIO.
    * @param  Led: LED to be configured.
    *          This parameter can be one of the following values:
    *            @arg  LED1
    * @retval None
    */
  void BSP_LED_Init(Led_TypeDef Led)
  {
    GPIO_InitTypeDef  gpio_init_structure;
    GPIO_TypeDef*     gpio_led;
  
    if (Led == LED1)
    {
      gpio_led = LED1_GPIO_PORT;
      /* Enable the GPIO_LED clock */
      LED1_GPIO_CLK_ENABLE();
  
      /* Configure the GPIO_LED pin */
      gpio_init_structure.Pin = GPIO_PIN[Led];
      gpio_init_structure.Mode = GPIO_MODE_OUTPUT_PP;
      gpio_init_structure.Pull = GPIO_PULLUP;
      gpio_init_structure.Speed = GPIO_SPEED_HIGH;
  
      HAL_GPIO_Init(gpio_led, &gpio_init_structure);
  
      /* By default, turn off LED */
      HAL_GPIO_WritePin(gpio_led, GPIO_PIN[Led], GPIO_PIN_RESET);
    }
  }
  
  /**
    * @brief  DeInit LEDs.
    * @param  Led: LED to be configured.
    *          This parameter can be one of the following values:
    *            @arg  LED1
    * @note Led DeInit does not disable the GPIO clock
    * @retval None
    */
  void BSP_LED_DeInit(Led_TypeDef Led)
  {
    GPIO_InitTypeDef  gpio_init_structure;
    GPIO_TypeDef*     gpio_led;
  
    if (Led == LED1)
    {
      gpio_led = LED1_GPIO_PORT;
      /* Turn off LED */
      HAL_GPIO_WritePin(gpio_led, GPIO_PIN[Led], GPIO_PIN_RESET);
      /* Configure the GPIO_LED pin */
      gpio_init_structure.Pin = GPIO_PIN[Led];
      HAL_GPIO_DeInit(gpio_led, gpio_init_structure.Pin);
    }
  }
  
  /**
    * @brief  Turns selected LED On.
    * @param  Led: LED to be set on
    *          This parameter can be one of the following values:
    *            @arg  LED1
    * @retval None
    */
  void BSP_LED_On(Led_TypeDef Led)
  {
    GPIO_TypeDef*     gpio_led;
  
    if (Led == LED1)	/* Switch On LED connected to GPIO */
    {
      gpio_led = LED1_GPIO_PORT;
      HAL_GPIO_WritePin(gpio_led, GPIO_PIN[Led], GPIO_PIN_SET);
    }
  }
  
  /**
    * @brief  Turns selected LED Off.
    * @param  Led: LED to be set off
    *          This parameter can be one of the following values:
    *            @arg  LED1
    * @retval None
    */
  void BSP_LED_Off(Led_TypeDef Led)
  {
    GPIO_TypeDef*     gpio_led;
  
    if (Led == LED1) /* Switch Off LED connected to GPIO */
    {
      gpio_led = LED1_GPIO_PORT;
      HAL_GPIO_WritePin(gpio_led, GPIO_PIN[Led], GPIO_PIN_RESET);
    }
  }
  
  /**
    * @brief  Toggles the selected LED.
    * @param  Led: LED to be toggled
    *          This parameter can be one of the following values:
    *            @arg  LED1
    * @retval None
    */
  void BSP_LED_Toggle(Led_TypeDef Led)
  {
    GPIO_TypeDef*     gpio_led;
  
    if (Led == LED1)	/* Toggle LED connected to GPIO */
    {
      gpio_led = LED1_GPIO_PORT;
      HAL_GPIO_TogglePin(gpio_led, GPIO_PIN[Led]);
    }
  }
  
  /**
    * @brief  Configures button GPIO and EXTI Line.
    * @param  Button: Button to be configured
    *          This parameter can be one of the following values:
    *            @arg  BUTTON_WAKEUP: Wakeup Push Button
    *            @arg  BUTTON_TAMPER: Tamper Push Button
    *            @arg  BUTTON_KEY: Key Push Button
    * @param  ButtonMode: Button mode
    *          This parameter can be one of the following values:
    *            @arg  BUTTON_MODE_GPIO: Button will be used as simple IO
    *            @arg  BUTTON_MODE_EXTI: Button will be connected to EXTI line
    *                                    with interrupt generation capability
    * @note On STM32746G-Discovery board, the three buttons (Wakeup, Tamper and key buttons)
    *       are mapped on the same push button named "User"
    *       on the board serigraphy.
    * @retval None
    */
  void BSP_PB_Init(Button_TypeDef Button, ButtonMode_TypeDef ButtonMode)
  {
    GPIO_InitTypeDef gpio_init_structure;
  
    /* Enable the BUTTON clock */
    BUTTONx_GPIO_CLK_ENABLE(Button);
  
    if(ButtonMode == BUTTON_MODE_GPIO)
    {
      /* Configure Button pin as input */
      gpio_init_structure.Pin = BUTTON_PIN[Button];
      gpio_init_structure.Mode = GPIO_MODE_INPUT;
      gpio_init_structure.Pull = GPIO_NOPULL;
      gpio_init_structure.Speed = GPIO_SPEED_FAST;
      HAL_GPIO_Init(BUTTON_PORT[Button], &gpio_init_structure);
    }
  
    if(ButtonMode == BUTTON_MODE_EXTI)
    {
      /* Configure Button pin as input with External interrupt */
      gpio_init_structure.Pin = BUTTON_PIN[Button];
      gpio_init_structure.Pull = GPIO_NOPULL;
      gpio_init_structure.Speed = GPIO_SPEED_FAST;
  
      if(Button != BUTTON_WAKEUP)
      {
        gpio_init_structure.Mode = GPIO_MODE_IT_FALLING;
      }
      else
      {
        gpio_init_structure.Mode = GPIO_MODE_IT_RISING;
      }
  
      HAL_GPIO_Init(BUTTON_PORT[Button], &gpio_init_structure);
  
      /* Enable and set Button EXTI Interrupt to the lowest priority */
      HAL_NVIC_SetPriority((IRQn_Type)(BUTTON_IRQn[Button]), 0x0F, 0x00);
      HAL_NVIC_EnableIRQ((IRQn_Type)(BUTTON_IRQn[Button]));
    }
  }
  
  /**
    * @brief  Push Button DeInit.
    * @param  Button: Button to be configured
    *          This parameter can be one of the following values:
    *            @arg  BUTTON_WAKEUP: Wakeup Push Button
    *            @arg  BUTTON_TAMPER: Tamper Push Button
    *            @arg  BUTTON_KEY: Key Push Button
    * @note On STM32746G-Discovery board, the three buttons (Wakeup, Tamper and key buttons)
    *       are mapped on the same push button named "User"
    *       on the board serigraphy.
    * @note PB DeInit does not disable the GPIO clock
    * @retval None
    */
  void BSP_PB_DeInit(Button_TypeDef Button)
  {
      GPIO_InitTypeDef gpio_init_structure;
  
      gpio_init_structure.Pin = BUTTON_PIN[Button];
      HAL_NVIC_DisableIRQ((IRQn_Type)(BUTTON_IRQn[Button]));
      HAL_GPIO_DeInit(BUTTON_PORT[Button], gpio_init_structure.Pin);
  }
  
  
  /**
    * @brief  Returns the selected button state.
    * @param  Button: Button to be checked
    *          This parameter can be one of the following values:
    *            @arg  BUTTON_WAKEUP: Wakeup Push Button
    *            @arg  BUTTON_TAMPER: Tamper Push Button
    *            @arg  BUTTON_KEY: Key Push Button
    * @note On STM32746G-Discovery board, the three buttons (Wakeup, Tamper and key buttons)
    *       are mapped on the same push button named "User"
    *       on the board serigraphy.
    * @retval The Button GPIO pin value
    */
  uint32_t BSP_PB_GetState(Button_TypeDef Button)
  {
    return HAL_GPIO_ReadPin(BUTTON_PORT[Button], BUTTON_PIN[Button]);
  }
  
  /**
    * @brief  Configures COM port.
    * @param  COM: COM port to be configured.
    *          This parameter can be one of the following values:
    *            @arg  COM1
    *            @arg  COM2
    * @param  huart: Pointer to a UART_HandleTypeDef structure that contains the
    *                configuration information for the specified USART peripheral.
    * @retval None
    */
  void BSP_COM_Init(COM_TypeDef COM, UART_HandleTypeDef *huart)
  {
    GPIO_InitTypeDef gpio_init_structure;
  
    /* Enable GPIO clock */
    DISCOVERY_COMx_TX_GPIO_CLK_ENABLE(COM);
    DISCOVERY_COMx_RX_GPIO_CLK_ENABLE(COM);
  
    /* Enable USART clock */
    DISCOVERY_COMx_CLK_ENABLE(COM);
  
    /* Configure USART Tx as alternate function */
    gpio_init_structure.Pin = COM_TX_PIN[COM];
    gpio_init_structure.Mode = GPIO_MODE_AF_PP;
    gpio_init_structure.Speed = GPIO_SPEED_FAST;
    gpio_init_structure.Pull = GPIO_PULLUP;
    gpio_init_structure.Alternate = COM_TX_AF[COM];
    HAL_GPIO_Init(COM_TX_PORT[COM], &gpio_init_structure);
  
    /* Configure USART Rx as alternate function */
    gpio_init_structure.Pin = COM_RX_PIN[COM];
    gpio_init_structure.Mode = GPIO_MODE_AF_PP;
    gpio_init_structure.Alternate = COM_RX_AF[COM];
    HAL_GPIO_Init(COM_RX_PORT[COM], &gpio_init_structure);
  
    /* USART configuration */
    huart->Instance = COM_USART[COM];
    HAL_UART_Init(huart);
  }
  
  /**
    * @brief  DeInit COM port.
    * @param  COM: COM port to be configured.
    *          This parameter can be one of the following values:
    *            @arg  COM1
    *            @arg  COM2
    * @param  huart: Pointer to a UART_HandleTypeDef structure that contains the
    *                configuration information for the specified USART peripheral.
    * @retval None
    */
  void BSP_COM_DeInit(COM_TypeDef COM, UART_HandleTypeDef *huart)
  {
    /* USART configuration */
    huart->Instance = COM_USART[COM];
    HAL_UART_DeInit(huart);
  
    /* Enable USART clock */
    DISCOVERY_COMx_CLK_DISABLE(COM);
  
    /* DeInit GPIO pins can be done in the application
       (by surcharging this __weak function) */
  
    /* GPIO pins clock, DMA clock can be shut down in the application
       by surcharging this __weak function */
  }
  
  /*******************************************************************************
                              BUS OPERATIONS
  *******************************************************************************/
  
  /******************************* I2C Routines *********************************/
  /**
    * @brief  Initializes I2C MSP.
    * @param  i2c_handler : I2C handler
    * @retval None
    */
  static void I2Cx_MspInit(I2C_HandleTypeDef *i2c_handler)
  {
    GPIO_InitTypeDef  gpio_init_structure;
  
    if (i2c_handler == (I2C_HandleTypeDef*)(&hI2cAudioHandler))
    {
      /* AUDIO and LCD I2C MSP init */
  
      /*** Configure the GPIOs ***/
      /* Enable GPIO clock */
      DISCOVERY_AUDIO_I2Cx_SCL_SDA_GPIO_CLK_ENABLE();
  
      /* Configure I2C Tx as alternate function */
      gpio_init_structure.Pin = DISCOVERY_AUDIO_I2Cx_SCL_PIN;
      gpio_init_structure.Mode = GPIO_MODE_AF_OD;
      gpio_init_structure.Pull = GPIO_NOPULL;
      gpio_init_structure.Speed = GPIO_SPEED_FAST;
      gpio_init_structure.Alternate = DISCOVERY_AUDIO_I2Cx_SCL_SDA_AF;
      HAL_GPIO_Init(DISCOVERY_AUDIO_I2Cx_SCL_SDA_GPIO_PORT, &gpio_init_structure);
  
      /* Configure I2C Rx as alternate function */
      gpio_init_structure.Pin = DISCOVERY_AUDIO_I2Cx_SDA_PIN;
      HAL_GPIO_Init(DISCOVERY_AUDIO_I2Cx_SCL_SDA_GPIO_PORT, &gpio_init_structure);
  
      /*** Configure the I2C peripheral ***/
      /* Enable I2C clock */
      DISCOVERY_AUDIO_I2Cx_CLK_ENABLE();
  
      /* Force the I2C peripheral clock reset */
      DISCOVERY_AUDIO_I2Cx_FORCE_RESET();
  
      /* Release the I2C peripheral clock reset */
      DISCOVERY_AUDIO_I2Cx_RELEASE_RESET();
  
      /* Enable and set I2Cx Interrupt to a lower priority */
      HAL_NVIC_SetPriority(DISCOVERY_AUDIO_I2Cx_EV_IRQn, 0x0F, 0);
      HAL_NVIC_EnableIRQ(DISCOVERY_AUDIO_I2Cx_EV_IRQn);
  
      /* Enable and set I2Cx Interrupt to a lower priority */
      HAL_NVIC_SetPriority(DISCOVERY_AUDIO_I2Cx_ER_IRQn, 0x0F, 0);
      HAL_NVIC_EnableIRQ(DISCOVERY_AUDIO_I2Cx_ER_IRQn);
    }
    else
    {
      /* External, camera and Arduino connector I2C MSP init */
  
      /*** Configure the GPIOs ***/
      /* Enable GPIO clock */
      DISCOVERY_EXT_I2Cx_SCL_SDA_GPIO_CLK_ENABLE();
  
      /* Configure I2C Tx as alternate function */
      gpio_init_structure.Pin = DISCOVERY_EXT_I2Cx_SCL_PIN;
      gpio_init_structure.Mode = GPIO_MODE_AF_OD;
      gpio_init_structure.Pull = GPIO_NOPULL;
      gpio_init_structure.Speed = GPIO_SPEED_FAST;
      gpio_init_structure.Alternate = DISCOVERY_EXT_I2Cx_SCL_SDA_AF;
      HAL_GPIO_Init(DISCOVERY_EXT_I2Cx_SCL_SDA_GPIO_PORT, &gpio_init_structure);
  
      /* Configure I2C Rx as alternate function */
      gpio_init_structure.Pin = DISCOVERY_EXT_I2Cx_SDA_PIN;
      HAL_GPIO_Init(DISCOVERY_EXT_I2Cx_SCL_SDA_GPIO_PORT, &gpio_init_structure);
  
      /*** Configure the I2C peripheral ***/
      /* Enable I2C clock */
      DISCOVERY_EXT_I2Cx_CLK_ENABLE();
  
      /* Force the I2C peripheral clock reset */
      DISCOVERY_EXT_I2Cx_FORCE_RESET();
  
      /* Release the I2C peripheral clock reset */
      DISCOVERY_EXT_I2Cx_RELEASE_RESET();
  
      /* Enable and set I2Cx Interrupt to a lower priority */
      HAL_NVIC_SetPriority(DISCOVERY_EXT_I2Cx_EV_IRQn, 0x0F, 0);
      HAL_NVIC_EnableIRQ(DISCOVERY_EXT_I2Cx_EV_IRQn);
  
      /* Enable and set I2Cx Interrupt to a lower priority */
      HAL_NVIC_SetPriority(DISCOVERY_EXT_I2Cx_ER_IRQn, 0x0F, 0);
      HAL_NVIC_EnableIRQ(DISCOVERY_EXT_I2Cx_ER_IRQn);
    }
  }
  
  /**
    * @brief  Initializes I2C HAL.
    * @param  i2c_handler : I2C handler
    * @retval None
    */
  static void I2Cx_Init(I2C_HandleTypeDef *i2c_handler)
  {
    if(HAL_I2C_GetState(i2c_handler) == HAL_I2C_STATE_RESET)
    {
      if (i2c_handler == (I2C_HandleTypeDef*)(&hI2cAudioHandler))
      {
        /* Audio and LCD I2C configuration */
        i2c_handler->Instance = DISCOVERY_AUDIO_I2Cx;
      }
      else
      {
        /* External, camera and Arduino connector  I2C configuration */
        i2c_handler->Instance = DISCOVERY_EXT_I2Cx;
      }
      i2c_handler->Init.Timing           = DISCOVERY_I2Cx_TIMING;
      i2c_handler->Init.OwnAddress1      = 0;
      i2c_handler->Init.AddressingMode   = I2C_ADDRESSINGMODE_7BIT;
      i2c_handler->Init.DualAddressMode  = I2C_DUALADDRESS_DISABLE;
      i2c_handler->Init.OwnAddress2      = 0;
      i2c_handler->Init.GeneralCallMode  = I2C_GENERALCALL_DISABLE;
      i2c_handler->Init.NoStretchMode    = I2C_NOSTRETCH_DISABLE;
  
      /* Init the I2C */
      I2Cx_MspInit(i2c_handler);
      HAL_I2C_Init(i2c_handler);
    }
  }
  
  /**
    * @brief  Reads multiple data.
    * @param  i2c_handler : I2C handler
    * @param  Addr: I2C address
    * @param  Reg: Reg address
    * @param  MemAddress: Memory address
    * @param  Buffer: Pointer to data buffer
    * @param  Length: Length of the data
    * @retval Number of read data
    */
  static HAL_StatusTypeDef I2Cx_ReadMultiple(I2C_HandleTypeDef *i2c_handler,
                                             uint8_t Addr,
                                             uint16_t Reg,
                                             uint16_t MemAddress,
                                             uint8_t *Buffer,
                                             uint16_t Length)
  {
    HAL_StatusTypeDef status = HAL_OK;
  
    status = HAL_I2C_Mem_Read(i2c_handler, Addr, (uint16_t)Reg, MemAddress, Buffer, Length, 1000);
  
    /* Check the communication status */
    if(status != HAL_OK)
    {
      /* I2C error occurred */
      I2Cx_Error(i2c_handler, Addr);
    }
    return status;
  }
  
  /**
    * @brief  Writes a value in a register of the device through BUS in using DMA mode.
    * @param  i2c_handler : I2C handler
    * @param  Addr: Device address on BUS Bus.
    * @param  Reg: The target register address to write
    * @param  MemAddress: Memory address
    * @param  Buffer: The target register value to be written
    * @param  Length: buffer size to be written
    * @retval HAL status
    */
  static HAL_StatusTypeDef I2Cx_WriteMultiple(I2C_HandleTypeDef *i2c_handler,
                                              uint8_t Addr,
                                              uint16_t Reg,
                                              uint16_t MemAddress,
                                              uint8_t *Buffer,
                                              uint16_t Length)
  {
    HAL_StatusTypeDef status = HAL_OK;
  
    status = HAL_I2C_Mem_Write(i2c_handler, Addr, (uint16_t)Reg, MemAddress, Buffer, Length, 1000);
  
    /* Check the communication status */
    if(status != HAL_OK)
    {
      /* Re-Initiaize the I2C Bus */
      I2Cx_Error(i2c_handler, Addr);
    }
    return status;
  }
  
  /**
    * @brief  Checks if target device is ready for communication.
    * @note   This function is used with Memory devices
    * @param  i2c_handler : I2C handler
    * @param  DevAddress: Target device address
    * @param  Trials: Number of trials
    * @retval HAL status
    */
  static HAL_StatusTypeDef I2Cx_IsDeviceReady(I2C_HandleTypeDef *i2c_handler, uint16_t DevAddress, uint32_t Trials)
  {
    return (HAL_I2C_IsDeviceReady(i2c_handler, DevAddress, Trials, 1000));
  }
  
  /**
    * @brief  Manages error callback by re-initializing I2C.
    * @param  i2c_handler : I2C handler
    * @param  Addr: I2C Address
    * @retval None
    */
  static void I2Cx_Error(I2C_HandleTypeDef *i2c_handler, uint8_t Addr)
  {
    /* De-initialize the I2C communication bus */
    HAL_I2C_DeInit(i2c_handler);
  
    /* Re-Initialize the I2C communication bus */
    I2Cx_Init(i2c_handler);
  }
  
  /*******************************************************************************
                              LINK OPERATIONS
  *******************************************************************************/
  
  /********************************* LINK AUDIO *********************************/
  
  /**
    * @brief  Initializes Audio low level.
    * @retval None
    */
  void AUDIO_IO_Init(void)
  {
    I2Cx_Init(&hI2cAudioHandler);
  }
  
  /**
    * @brief  Deinitializes Audio low level.
    * @retval None
    */
  void AUDIO_IO_DeInit(void)
  {
  }
  
  /**
    * @brief  Writes a single data.
    * @param  Addr: I2C address
    * @param  Reg: Reg address
    * @param  Value: Data to be written
    * @retval None
    */
  void AUDIO_IO_Write(uint8_t Addr, uint16_t Reg, uint16_t Value)
  {
    uint16_t tmp = Value;
  
    Value = ((uint16_t)(tmp >> 8) & 0x00FF);
  
    Value |= ((uint16_t)(tmp << 8)& 0xFF00);
  
    I2Cx_WriteMultiple(&hI2cAudioHandler, Addr, Reg, I2C_MEMADD_SIZE_16BIT,(uint8_t*)&Value, 2);
  }
  
  /**
    * @brief  Reads a single data.
    * @param  Addr: I2C address
    * @param  Reg: Reg address
    * @retval Data to be read
    */
  uint16_t AUDIO_IO_Read(uint8_t Addr, uint16_t Reg)
  {
    uint16_t read_value = 0, tmp = 0;
  
    I2Cx_ReadMultiple(&hI2cAudioHandler, Addr, Reg, I2C_MEMADD_SIZE_16BIT, (uint8_t*)&read_value, 2);
  
    tmp = ((uint16_t)(read_value >> 8) & 0x00FF);
  
    tmp |= ((uint16_t)(read_value << 8)& 0xFF00);
  
    read_value = tmp;
  
    return read_value;
  }
  
  /**
    * @brief  AUDIO Codec delay
    * @param  Delay: Delay in ms
    * @retval None
    */
  void AUDIO_IO_Delay(uint32_t Delay)
  {
    HAL_Delay(Delay);
  }
  
  /********************************* LINK CAMERA ********************************/
  
  /**
    * @brief  Initializes Camera low level.
    * @retval None
    */
  void CAMERA_IO_Init(void)
  {
    I2Cx_Init(&hI2cExtHandler);
  }
  
  /**
    * @brief  Camera writes single data.
    * @param  Addr: I2C address
    * @param  Reg: Register address
    * @param  Value: Data to be written
    * @retval None
    */
  void CAMERA_IO_Write(uint8_t Addr, uint8_t Reg, uint8_t Value)
  {
    I2Cx_WriteMultiple(&hI2cExtHandler, Addr, (uint16_t)Reg, I2C_MEMADD_SIZE_8BIT,(uint8_t*)&Value, 1);
  }
  
  /**
    * @brief  Camera reads single data.
    * @param  Addr: I2C address
    * @param  Reg: Register address
    * @retval Read data
    */
  uint8_t CAMERA_IO_Read(uint8_t Addr, uint8_t Reg)
  {
    uint8_t read_value = 0;
  
    I2Cx_ReadMultiple(&hI2cExtHandler, Addr, Reg, I2C_MEMADD_SIZE_8BIT, (uint8_t*)&read_value, 1);
  
    return read_value;
  }
  
  /**
    * @brief  Camera delay
    * @param  Delay: Delay in ms
    * @retval None
    */
  void CAMERA_Delay(uint32_t Delay)
  {
    HAL_Delay(Delay);
  }
  
  /******************************** LINK I2C EEPROM *****************************/
  
  /**
    * @brief  Initializes peripherals used by the I2C EEPROM driver.
    * @retval None
    */
  void EEPROM_IO_Init(void)
  {
    I2Cx_Init(&hI2cExtHandler);
  }
  
  /**
    * @brief  Write data to I2C EEPROM driver in using DMA channel.
    * @param  DevAddress: Target device address
    * @param  MemAddress: Internal memory address
    * @param  pBuffer: Pointer to data buffer
    * @param  BufferSize: Amount of data to be sent
    * @retval HAL status
    */
  HAL_StatusTypeDef EEPROM_IO_WriteData(uint16_t DevAddress, uint16_t MemAddress, uint8_t* pBuffer, uint32_t BufferSize)
  {
    return (I2Cx_WriteMultiple(&hI2cExtHandler, DevAddress, MemAddress, I2C_MEMADD_SIZE_16BIT, pBuffer, BufferSize));
  }
  
  /**
    * @brief  Read data from I2C EEPROM driver in using DMA channel.
    * @param  DevAddress: Target device address
    * @param  MemAddress: Internal memory address
    * @param  pBuffer: Pointer to data buffer
    * @param  BufferSize: Amount of data to be read
    * @retval HAL status
    */
  HAL_StatusTypeDef EEPROM_IO_ReadData(uint16_t DevAddress, uint16_t MemAddress, uint8_t* pBuffer, uint32_t BufferSize)
  {
    return (I2Cx_ReadMultiple(&hI2cExtHandler, DevAddress, MemAddress, I2C_MEMADD_SIZE_16BIT, pBuffer, BufferSize));
  }
  
  /**
    * @brief  Checks if target device is ready for communication.
    * @note   This function is used with Memory devices
    * @param  DevAddress: Target device address
    * @param  Trials: Number of trials
    * @retval HAL status
    */
  HAL_StatusTypeDef EEPROM_IO_IsDeviceReady(uint16_t DevAddress, uint32_t Trials)
  {
    return (I2Cx_IsDeviceReady(&hI2cExtHandler, DevAddress, Trials));
  }
  
  /********************************* LINK TOUCHSCREEN *********************************/
  
  /**
    * @brief  Initializes Touchscreen low level.
    * @retval None
    */
  void TS_IO_Init(void)
  {
    I2Cx_Init(&hI2cAudioHandler);
  }
  
  /**
    * @brief  Writes a single data.
    * @param  Addr: I2C address
    * @param  Reg: Reg address
    * @param  Value: Data to be written
    * @retval None
    */
  void TS_IO_Write(uint8_t Addr, uint8_t Reg, uint8_t Value)
  {
    I2Cx_WriteMultiple(&hI2cAudioHandler, Addr, (uint16_t)Reg, I2C_MEMADD_SIZE_8BIT,(uint8_t*)&Value, 1);
  }
  
  /**
    * @brief  Reads a single data.
    * @param  Addr: I2C address
    * @param  Reg: Reg address
    * @retval Data to be read
    */
  uint8_t TS_IO_Read(uint8_t Addr, uint8_t Reg)
  {
    uint8_t read_value = 0;
  
    I2Cx_ReadMultiple(&hI2cAudioHandler, Addr, Reg, I2C_MEMADD_SIZE_8BIT, (uint8_t*)&read_value, 1);
  
    return read_value;
  }
  
  /**
    * @brief  TS delay
    * @param  Delay: Delay in ms
    * @retval None
    */
  void TS_IO_Delay(uint32_t Delay)
  {
    HAL_Delay(Delay);
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  