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diff --git a/lib/stm32f1/hal/source/stm32f1xx_hal_cec.c b/lib/stm32f1/hal/source/stm32f1xx_hal_cec.c
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+++ b/lib/stm32f1/hal/source/stm32f1xx_hal_cec.c
@@ -0,0 +1,1005 @@
+/**
+  ******************************************************************************
+  * @file    stm32f1xx_hal_cec.c
+  * @author  MCD Application Team
+  * @brief   CEC HAL module driver.
+  *          This file provides firmware functions to manage the following 
+  *          functionalities of the High Definition Multimedia Interface 
+  *          Consumer Electronics Control Peripheral (CEC).
+  *           + Initialization and de-initialization function
+  *           + IO operation function
+  *           + Peripheral Control function
+  *
+  *           
+  @verbatim       
+ ===============================================================================
+                        ##### How to use this driver #####
+ ===============================================================================
+    [..]
+    The CEC HAL driver can be used as follow:
+    
+    (#) Declare a CEC_HandleTypeDef handle structure.
+    (#) Initialize the CEC low level resources by implementing the HAL_CEC_MspInit ()API:
+        (##) Enable the CEC interface clock.
+        (##) CEC pins configuration:
+            (+++) Enable the clock for the CEC GPIOs.
+            (+++) Configure these CEC pins as alternate function pull-up.
+        (##) NVIC configuration if you need to use interrupt process (HAL_CEC_Transmit_IT()
+             and HAL_CEC_Receive_IT() APIs):
+            (+++) Configure the CEC interrupt priority.
+            (+++) Enable the NVIC CEC IRQ handle.
+            (+++) The specific CEC interrupts (Transmission complete interrupt, 
+                  RXNE interrupt and Error Interrupts) will be managed using the macros
+                  __HAL_CEC_ENABLE_IT() and __HAL_CEC_DISABLE_IT() inside the transmit 
+                  and receive process.
+
+    (#) Program the Bit Timing Error Mode and the Bit Period Error Mode in the hcec Init structure.
+
+    (#) Initialize the CEC registers by calling the HAL_CEC_Init() API.
+
+  [..]        
+    (@) This API (HAL_CEC_Init()) configures also the low level Hardware (GPIO, CLOCK, CORTEX...etc)
+        by calling the customed HAL_CEC_MspInit() API.
+  *** Callback registration ***
+  =============================================
+  The compilation define  USE_HAL_CEC_REGISTER_CALLBACKS when set to 1
+  allows the user to configure dynamically the driver callbacks.
+  Use Functions @ref HAL_CEC_RegisterCallback() or HAL_CEC_RegisterXXXCallback()
+  to register an interrupt callback.
+
+  Function @ref HAL_CEC_RegisterCallback() allows to register following callbacks:
+    (+) TxCpltCallback     : Tx Transfer completed callback.
+    (+) ErrorCallback      : callback for error detection.
+    (+) MspInitCallback    : CEC MspInit.
+    (+) MspDeInitCallback  : CEC MspDeInit.
+  This function takes as parameters the HAL peripheral handle, the Callback ID
+  and a pointer to the user callback function.
+
+  For specific callback HAL_CEC_RxCpltCallback use dedicated register callbacks 
+  @ref HAL_CEC_RegisterRxCpltCallback().
+
+  Use function @ref HAL_CEC_UnRegisterCallback() to reset a callback to the default
+  weak function.
+  @ref HAL_CEC_UnRegisterCallback() takes as parameters the HAL peripheral handle,
+  and the Callback ID.
+  This function allows to reset following callbacks:
+    (+) TxCpltCallback     : Tx Transfer completed callback.
+    (+) ErrorCallback      : callback for error detection.
+    (+) MspInitCallback    : CEC MspInit.
+    (+) MspDeInitCallback  : CEC MspDeInit.
+
+  For callback HAL_CEC_RxCpltCallback use dedicated unregister callback : 
+  @ref HAL_CEC_UnRegisterRxCpltCallback().
+
+  By default, after the @ref HAL_CEC_Init() and when the state is HAL_CEC_STATE_RESET
+  all callbacks are set to the corresponding weak functions :
+  examples @ref HAL_CEC_TxCpltCallback() , @ref HAL_CEC_RxCpltCallback().
+  Exception done for MspInit and MspDeInit functions that are
+  reset to the legacy weak function in the @ref HAL_CEC_Init()/ @ref HAL_CEC_DeInit() only when
+  these callbacks are null (not registered beforehand).
+  if not, MspInit or MspDeInit are not null, the @ref HAL_CEC_Init() / @ref HAL_CEC_DeInit()
+  keep and use the user MspInit/MspDeInit functions (registered beforehand)
+
+  Callbacks can be registered/unregistered in HAL_CEC_STATE_READY state only.
+  Exception done MspInit/MspDeInit callbacks that can be registered/unregistered
+  in HAL_CEC_STATE_READY or HAL_CEC_STATE_RESET state,
+  thus registered (user) MspInit/DeInit callbacks can be used during the Init/DeInit.
+  In that case first register the MspInit/MspDeInit user callbacks
+  using @ref HAL_CEC_RegisterCallback() before calling @ref HAL_CEC_DeInit()
+  or @ref HAL_CEC_Init() function.
+
+  When the compilation define USE_HAL_CEC_REGISTER_CALLBACKS is set to 0 or
+  not defined, the callback registration feature is not available and all callbacks
+  are set to the corresponding weak functions.
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************  
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f1xx_hal.h"
+
+#ifdef HAL_CEC_MODULE_ENABLED
+
+#if defined (CEC)
+
+/** @addtogroup STM32F1xx_HAL_Driver
+  * @{
+  */
+
+/** @defgroup CEC CEC
+  * @brief HAL CEC module driver
+  * @{
+  */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/** @defgroup CEC_Private_Constants CEC Private Constants
+  * @{
+  */
+#define CEC_CFGR_FIELDS (CEC_CFGR_BTEM | CEC_CFGR_BPEM )
+#define CEC_FLAG_TRANSMIT_MASK (CEC_FLAG_TSOM|CEC_FLAG_TEOM|CEC_FLAG_TBTRF)
+#define CEC_FLAG_RECEIVE_MASK (CEC_FLAG_RSOM|CEC_FLAG_REOM|CEC_FLAG_RBTF)
+#define CEC_ESR_ALL_ERROR (CEC_ESR_BTE|CEC_ESR_BPE|CEC_ESR_RBTFE|CEC_ESR_SBE|CEC_ESR_ACKE|CEC_ESR_LINE|CEC_ESR_TBTFE)
+#define CEC_RXXFERSIZE_INITIALIZE 0xFFFF /*!< Value used to initialise the RxXferSize of the handle */
+/**
+  * @}
+  */
+ 
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/** @defgroup CEC_Private_Functions CEC Private Functions
+  * @{
+  */
+static HAL_StatusTypeDef CEC_Transmit_IT(CEC_HandleTypeDef *hcec);
+static HAL_StatusTypeDef CEC_Receive_IT(CEC_HandleTypeDef *hcec);
+/**
+  * @}
+  */
+  
+/* Exported functions ---------------------------------------------------------*/
+
+/** @defgroup CEC_Exported_Functions CEC Exported Functions
+  * @{
+  */
+
+/** @defgroup CEC_Exported_Functions_Group1 Initialization and de-initialization functions
+  *  @brief    Initialization and Configuration functions 
+  *
+@verbatim                                                
+===============================================================================
+            ##### Initialization and Configuration functions #####
+ ===============================================================================  
+    [..]
+    This subsection provides a set of functions allowing to initialize the CEC
+      (+) The following parameters need to be configured: 
+        (++) TimingErrorFree
+        (++) PeriodErrorFree 
+        (++) InitiatorAddress
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief Initializes the CEC mode according to the specified
+  *         parameters in the CEC_InitTypeDef and creates the associated handle .
+  * @param hcec: CEC handle
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_CEC_Init(CEC_HandleTypeDef *hcec)
+{
+  /* Check the CEC handle allocation */
+  if((hcec == NULL) ||(hcec->Init.RxBuffer == NULL))
+  {
+    return HAL_ERROR;
+  }
+
+  /* Check the parameters */ 
+  assert_param(IS_CEC_ALL_INSTANCE(hcec->Instance));
+  assert_param(IS_CEC_BIT_TIMING_ERROR_MODE(hcec->Init.TimingErrorFree));
+  assert_param(IS_CEC_BIT_PERIOD_ERROR_MODE(hcec->Init.PeriodErrorFree));
+  assert_param(IS_CEC_ADDRESS(hcec->Init.OwnAddress));
+#if (USE_HAL_CEC_REGISTER_CALLBACKS == 1)
+  if(hcec->gState == HAL_CEC_STATE_RESET)
+  {
+    /* Allocate lock resource and initialize it */
+    hcec->Lock = HAL_UNLOCKED;
+
+    hcec->TxCpltCallback  = HAL_CEC_TxCpltCallback;  /* Legacy weak TxCpltCallback  */
+    hcec->RxCpltCallback = HAL_CEC_RxCpltCallback;   /* Legacy weak RxCpltCallback */
+    hcec->ErrorCallback = HAL_CEC_ErrorCallback;     /* Legacy weak ErrorCallback */
+
+    if(hcec->MspInitCallback == NULL)
+    {
+      hcec->MspInitCallback = HAL_CEC_MspInit; /* Legacy weak MspInit  */
+    }
+
+    /* Init the low level hardware */
+    hcec->MspInitCallback(hcec);
+  }
+#else
+  if(hcec->gState == HAL_CEC_STATE_RESET)
+  {
+    /* Allocate lock resource and initialize it */
+    hcec->Lock = HAL_UNLOCKED;
+    /* Init the low level hardware : GPIO, CLOCK */
+    HAL_CEC_MspInit(hcec);
+  }
+#endif /* USE_HAL_CEC_REGISTER_CALLBACKS */
+
+  hcec->gState = HAL_CEC_STATE_BUSY;
+  
+  /* Disable the Peripheral */
+  __HAL_CEC_DISABLE(hcec);
+  
+  /* Write to CEC Control Register */
+  MODIFY_REG(hcec->Instance->CFGR, CEC_CFGR_FIELDS, hcec->Init.TimingErrorFree | hcec->Init.PeriodErrorFree);
+  
+  /* Write to CEC Own Address Register */
+  MODIFY_REG(hcec->Instance->OAR, CEC_OAR_OA, hcec->Init.OwnAddress);
+  
+  /* Configure the prescaler to generate the required 50 microseconds time base.*/
+  MODIFY_REG(hcec->Instance->PRES, CEC_PRES_PRES, 50U * (HAL_RCC_GetPCLK1Freq()/1000000U) - 1U);
+  
+  /* Enable the following CEC Interrupt */
+  __HAL_CEC_ENABLE_IT(hcec, CEC_IT_IE);
+
+  /* Enable the CEC Peripheral */
+  __HAL_CEC_ENABLE(hcec);
+  
+  hcec->ErrorCode = HAL_CEC_ERROR_NONE;
+  hcec->gState = HAL_CEC_STATE_READY;
+  hcec->RxState = HAL_CEC_STATE_READY;
+  
+  return HAL_OK;
+}
+
+/**
+  * @brief DeInitializes the CEC peripheral 
+  * @param hcec: CEC handle
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_CEC_DeInit(CEC_HandleTypeDef *hcec)
+{
+  /* Check the CEC handle allocation */
+  if(hcec == NULL)
+  {
+    return HAL_ERROR;
+  }
+
+  /* Check the parameters */
+  assert_param(IS_CEC_ALL_INSTANCE(hcec->Instance));
+
+  hcec->gState = HAL_CEC_STATE_BUSY;
+
+#if (USE_HAL_CEC_REGISTER_CALLBACKS == 1)
+  if(hcec->MspDeInitCallback == NULL)
+  {
+    hcec->MspDeInitCallback = HAL_CEC_MspDeInit; /* Legacy weak MspDeInit  */
+  }
+
+  /* DeInit the low level hardware */
+  hcec->MspDeInitCallback(hcec);
+
+#else
+  /* DeInit the low level hardware */
+  HAL_CEC_MspDeInit(hcec);
+#endif /* USE_HAL_CEC_REGISTER_CALLBACKS */
+
+  __HAL_RCC_CEC_FORCE_RESET();
+  __HAL_RCC_CEC_RELEASE_RESET();
+  
+  hcec->ErrorCode = HAL_CEC_ERROR_NONE;
+  hcec->gState = HAL_CEC_STATE_RESET;
+  hcec->RxState = HAL_CEC_STATE_RESET;
+  
+  /* Process Unlock */
+  __HAL_UNLOCK(hcec);
+  
+  return HAL_OK;
+}
+
+/**
+  * @brief Initializes the Own Address of the CEC device
+  * @param hcec: CEC handle
+  * @param  CEC_OwnAddress: The CEC own address.  
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_CEC_SetDeviceAddress(CEC_HandleTypeDef *hcec, uint16_t CEC_OwnAddress)
+{
+  /* Check the parameters */
+  assert_param(IS_CEC_OWN_ADDRESS(CEC_OwnAddress));
+
+  if ((hcec->gState == HAL_CEC_STATE_READY) && (hcec->RxState == HAL_CEC_STATE_READY))
+  { 
+    /* Process Locked */
+    __HAL_LOCK(hcec); 
+    
+    hcec->gState = HAL_CEC_STATE_BUSY;
+  
+    /* Disable the Peripheral */
+    __HAL_CEC_DISABLE(hcec);
+    
+    if(CEC_OwnAddress != CEC_OWN_ADDRESS_NONE)
+    {
+       MODIFY_REG(hcec->Instance->OAR, CEC_OAR_OA, hcec->Init.OwnAddress);
+    }
+    else
+    {
+       CLEAR_BIT(hcec->Instance->OAR, CEC_OAR_OA);  
+    }
+        
+    hcec->gState = HAL_CEC_STATE_READY;
+    hcec->ErrorCode = HAL_CEC_ERROR_NONE;
+    
+    /* Process Unlocked */
+    __HAL_UNLOCK(hcec); 
+    
+    /* Enable the Peripheral */
+    __HAL_CEC_ENABLE(hcec);
+    
+    return  HAL_OK; 
+  }
+  else
+  {
+    return HAL_BUSY;
+  }
+}
+
+/**
+  * @brief CEC MSP Init
+  * @param hcec: CEC handle
+  * @retval None
+  */
+ __weak void HAL_CEC_MspInit(CEC_HandleTypeDef *hcec)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hcec);
+  /* NOTE : This function should not be modified, when the callback is needed,
+            the HAL_CEC_MspInit can be implemented in the user file
+   */ 
+}
+
+/**
+  * @brief CEC MSP DeInit
+  * @param hcec: CEC handle
+  * @retval None
+  */
+ __weak void HAL_CEC_MspDeInit(CEC_HandleTypeDef *hcec)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hcec);
+  /* NOTE : This function should not be modified, when the callback is needed,
+            the HAL_CEC_MspDeInit can be implemented in the user file
+   */ 
+}
+
+#if (USE_HAL_CEC_REGISTER_CALLBACKS == 1)
+/**
+  * @brief  Register a User CEC Callback
+  *         To be used instead of the weak predefined callback
+  * @param  hcec CEC handle
+  * @param  CallbackID ID of the callback to be registered
+  *         This parameter can be one of the following values:
+  *          @arg @ref HAL_CEC_TX_CPLT_CB_ID Tx Complete callback ID
+  *          @arg @ref HAL_CEC_ERROR_CB_ID Error callback ID
+  *          @arg @ref HAL_CEC_MSPINIT_CB_ID MspInit callback ID
+  *          @arg @ref HAL_CEC_MSPDEINIT_CB_ID MspDeInit callback ID
+  * @param  pCallback pointer to the Callback function
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_CEC_RegisterCallback(CEC_HandleTypeDef *hcec, HAL_CEC_CallbackIDTypeDef CallbackID, pCEC_CallbackTypeDef pCallback)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  if(pCallback == NULL)
+  {
+    /* Update the error code */
+    hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+    return HAL_ERROR;
+  }
+    /* Process locked */
+  __HAL_LOCK(hcec);
+
+  if(hcec->gState == HAL_CEC_STATE_READY)
+  {
+    switch (CallbackID)
+    {
+    case HAL_CEC_TX_CPLT_CB_ID :
+      hcec->TxCpltCallback = pCallback;
+      break;
+
+    case HAL_CEC_ERROR_CB_ID :
+      hcec->ErrorCallback = pCallback;
+      break;
+
+    case HAL_CEC_MSPINIT_CB_ID :
+      hcec->MspInitCallback = pCallback;
+      break;
+
+   case HAL_CEC_MSPDEINIT_CB_ID :
+      hcec->MspDeInitCallback = pCallback;
+      break;
+
+    default :
+      /* Update the error code */
+      hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+      /* Return error status */
+      status =  HAL_ERROR;
+      break;
+    }
+  }
+  else if(hcec->gState == HAL_CEC_STATE_RESET)
+  {
+    switch (CallbackID)
+    {
+    case HAL_CEC_MSPINIT_CB_ID :
+      hcec->MspInitCallback = pCallback;
+      break;
+
+   case HAL_CEC_MSPDEINIT_CB_ID :
+      hcec->MspDeInitCallback = pCallback;
+      break;
+
+    default :
+      /* Update the error code */
+      hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+     /* Return error status */
+      status =  HAL_ERROR;
+      break;
+    }
+  }
+  else
+  {
+    /* Update the error code */
+    hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+    /* Return error status */
+    status =  HAL_ERROR;
+  }
+
+  /* Release Lock */
+  __HAL_UNLOCK(hcec);
+
+  return status;
+}
+
+/**
+  * @brief  Unregister an CEC Callback
+  *         CEC callabck is redirected to the weak predefined callback
+  * @param hcec uart handle
+  * @param CallbackID ID of the callback to be unregistered
+  *         This parameter can be one of the following values:
+  *          @arg @ref HAL_CEC_TX_CPLT_CB_ID Tx Complete callback IDD
+  *          @arg @ref HAL_CEC_ERROR_CB_ID Error callback ID
+  *          @arg @ref HAL_CEC_MSPINIT_CB_ID MspInit callback ID
+  *          @arg @ref HAL_CEC_MSPDEINIT_CB_ID MspDeInit callback ID
+  * @retval status
+  */
+HAL_StatusTypeDef HAL_CEC_UnRegisterCallback(CEC_HandleTypeDef *hcec, HAL_CEC_CallbackIDTypeDef CallbackID)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  /* Process locked */
+  __HAL_LOCK(hcec);
+
+  if(hcec->gState == HAL_CEC_STATE_READY)
+  {
+    switch (CallbackID)
+    {
+    case HAL_CEC_TX_CPLT_CB_ID :
+      hcec->TxCpltCallback = HAL_CEC_TxCpltCallback;  /* Legacy weak  TxCpltCallback */
+      break;
+
+    case HAL_CEC_ERROR_CB_ID :
+      hcec->ErrorCallback = HAL_CEC_ErrorCallback;  /* Legacy weak ErrorCallback   */
+      break;
+
+    case HAL_CEC_MSPINIT_CB_ID :
+      hcec->MspInitCallback = HAL_CEC_MspInit;
+      break;
+
+   case HAL_CEC_MSPDEINIT_CB_ID :
+      hcec->MspDeInitCallback = HAL_CEC_MspDeInit;
+      break;
+
+    default :
+      /* Update the error code */
+      hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+     /* Return error status */
+      status =  HAL_ERROR;
+      break;
+    }
+  }
+  else if(hcec->gState == HAL_CEC_STATE_RESET)
+  {
+    switch (CallbackID)
+    {
+    case HAL_CEC_MSPINIT_CB_ID :
+      hcec->MspInitCallback = HAL_CEC_MspInit;
+      break;
+
+   case HAL_CEC_MSPDEINIT_CB_ID :
+      hcec->MspDeInitCallback = HAL_CEC_MspDeInit;
+      break;
+
+    default :
+      /* Update the error code */
+      hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+     /* Return error status */
+      status =  HAL_ERROR;
+      break;
+    }
+  }
+  else
+  {
+    /* Update the error code */
+    hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+    /* Return error status */
+    status =  HAL_ERROR;
+  }
+
+  /* Release Lock */
+  __HAL_UNLOCK(hcec);
+
+  return status;
+}
+
+/**
+  * @brief  Register CEC RX complete Callback
+  *         To be used instead of the weak HAL_CEC_RxCpltCallback() predefined callback
+  * @param  hcec CEC handle
+  * @param  pCallback pointer to the Rx transfer compelete Callback function
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_CEC_RegisterRxCpltCallback(CEC_HandleTypeDef *hcec, pCEC_RxCallbackTypeDef pCallback)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  if(pCallback == NULL)
+  {
+    /* Update the error code */
+    hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+    return HAL_ERROR;
+  }
+  /* Process locked */
+  __HAL_LOCK(hcec);
+
+  if(HAL_CEC_STATE_READY == hcec->RxState)
+  {
+    hcec->RxCpltCallback = pCallback;
+  }
+  else
+  {
+    /* Update the error code */
+    hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+    /* Return error status */
+    status =  HAL_ERROR;
+  }
+
+  /* Release Lock */
+  __HAL_UNLOCK(hcec);
+  return status;
+}
+
+/**
+  * @brief  UnRegister CEC RX complete Callback
+  *         CEC RX complete Callback is redirected to the weak HAL_CEC_RxCpltCallback() predefined callback
+  * @param  hcec CEC handle
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_CEC_UnRegisterRxCpltCallback(CEC_HandleTypeDef *hcec)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+
+  /* Process locked */
+  __HAL_LOCK(hcec);
+
+  if(HAL_CEC_STATE_READY == hcec->RxState)
+  {
+    hcec->RxCpltCallback = HAL_CEC_RxCpltCallback; /* Legacy weak  CEC RxCpltCallback  */
+  }
+  else
+  {
+    /* Update the error code */
+    hcec->ErrorCode |= HAL_CEC_ERROR_INVALID_CALLBACK;
+    /* Return error status */
+    status =  HAL_ERROR;
+  }
+
+  /* Release Lock */
+  __HAL_UNLOCK(hcec);
+  return status;
+}
+#endif /* USE_HAL_CEC_REGISTER_CALLBACKS */
+
+/**
+  * @}
+  */
+
+/** @defgroup CEC_Exported_Functions_Group2 Input and Output operation functions 
+  *  @brief CEC Transmit/Receive functions 
+  *
+@verbatim   
+ ===============================================================================
+                      ##### IO operation functions ##### 
+ ===============================================================================  
+    [..]
+    This subsection provides a set of functions allowing to manage the CEC data transfers.
+    
+    (#) The CEC handle must contain the initiator (TX side) and the destination (RX side)
+        logical addresses (4-bit long addresses, 0xF for broadcast messages destination)
+    
+    (#) The communication is performed using Interrupts. 
+           These API's return the HAL status.
+           The end of the data processing will be indicated through the 
+           dedicated CEC IRQ when using Interrupt mode.
+           The HAL_CEC_TxCpltCallback(), HAL_CEC_RxCpltCallback() user callbacks 
+           will be executed respectively at the end of the transmit or Receive process
+           The HAL_CEC_ErrorCallback() user callback will be executed when a communication 
+           error is detected
+        
+    (#) API's with Interrupt are :
+         (+) HAL_CEC_Transmit_IT()
+         (+) HAL_CEC_IRQHandler()
+
+    (#) A set of User Callbacks are provided:
+         (+) HAL_CEC_TxCpltCallback()
+         (+) HAL_CEC_RxCpltCallback()
+         (+) HAL_CEC_ErrorCallback()
+      
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief Send data in interrupt mode 
+  * @param hcec: CEC handle
+  * @param InitiatorAddress: Initiator address
+  * @param DestinationAddress: destination logical address      
+  * @param pData: pointer to input byte data buffer
+  * @param Size: amount of data to be sent in bytes (without counting the header).
+  *              0 means only the header is sent (ping operation).
+  *              Maximum TX size is 15 bytes (1 opcode and up to 14 operands).    
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_CEC_Transmit_IT(CEC_HandleTypeDef *hcec, uint8_t InitiatorAddress,uint8_t DestinationAddress, uint8_t *pData, uint32_t Size)
+{
+  /* if the IP isn't already busy and if there is no previous transmission
+     already pending due to arbitration lost */
+  if(hcec->gState == HAL_CEC_STATE_READY) 
+  {    
+    if((pData == NULL ) && (Size > 0U)) 
+    {
+      return  HAL_ERROR;
+    }
+
+    assert_param(IS_CEC_ADDRESS(DestinationAddress));
+    assert_param(IS_CEC_ADDRESS(InitiatorAddress)); 
+    assert_param(IS_CEC_MSGSIZE(Size));
+    
+    /* Process Locked */
+    __HAL_LOCK(hcec);
+    hcec->pTxBuffPtr = pData;
+    hcec->gState = HAL_CEC_STATE_BUSY_TX;
+    hcec->ErrorCode = HAL_CEC_ERROR_NONE;
+
+    /* initialize the number of bytes to send,
+     * 0 means only one header is sent (ping operation) */
+    hcec->TxXferCount = Size;
+
+    /* send header block */
+    hcec->Instance->TXD = (uint8_t)((uint32_t)InitiatorAddress << CEC_INITIATOR_LSB_POS) | DestinationAddress;
+    
+    /* Process Unlocked */
+    __HAL_UNLOCK(hcec); 
+
+    /* case no data to be sent, sender is only pinging the system */
+    if (Size != 0)
+    {    
+      /* Set TX Start of Message (TXSOM) bit */
+      MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_TRANSMIT_MASK, CEC_FLAG_TSOM);
+    }
+    else
+    {
+      /* Send a ping command */
+      MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_TRANSMIT_MASK, CEC_FLAG_TEOM|CEC_FLAG_TSOM);
+    }
+    return HAL_OK;
+
+  }
+  else
+  {
+    return HAL_BUSY;   
+  }
+}
+
+/**
+  * @brief Get size of the received frame.
+  * @param hcec: CEC handle
+  * @retval Frame size
+  */
+uint32_t HAL_CEC_GetLastReceivedFrameSize(CEC_HandleTypeDef *hcec)
+{
+  return hcec->RxXferSize;
+}
+
+/**
+  * @brief Change Rx Buffer.
+  * @param hcec: CEC handle
+  * @param Rxbuffer: Rx Buffer
+  * @note  This function can be called only inside the HAL_CEC_RxCpltCallback() 
+  * @retval Frame size
+  */
+void HAL_CEC_ChangeRxBuffer(CEC_HandleTypeDef *hcec, uint8_t* Rxbuffer)
+{
+  hcec->Init.RxBuffer = Rxbuffer; 
+}
+  
+/**
+  * @brief This function handles CEC interrupt requests.
+  * @param hcec: CEC handle
+  * @retval None
+  */
+void HAL_CEC_IRQHandler(CEC_HandleTypeDef *hcec)
+{
+  /* Save error status register for further error handling purposes */
+  hcec->ErrorCode = READ_BIT(hcec->Instance->ESR, CEC_ESR_ALL_ERROR);
+
+  /* Transmit error */
+  if(__HAL_CEC_GET_FLAG(hcec, CEC_FLAG_TERR) != RESET)
+  {
+    /* Acknowledgement of the error */
+    __HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_TERR);
+    
+    hcec->gState = HAL_CEC_STATE_READY;
+  }
+  
+  /* Receive error */
+  if(__HAL_CEC_GET_FLAG(hcec, CEC_FLAG_RERR) != RESET)
+  {
+    /* Acknowledgement of the error */
+    __HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_RERR);
+    hcec->Init.RxBuffer-=hcec->RxXferSize;
+    hcec->RxXferSize = 0U; 
+    hcec->RxState = HAL_CEC_STATE_READY;
+  }
+  
+  if((hcec->ErrorCode & CEC_ESR_ALL_ERROR) != 0U)
+  {
+    /* Error  Call Back */
+#if (USE_HAL_CEC_REGISTER_CALLBACKS == 1)
+    hcec->ErrorCallback(hcec);
+#else    
+    HAL_CEC_ErrorCallback(hcec);
+#endif /* USE_HAL_CEC_REGISTER_CALLBACKS */
+  }
+  
+  /* Transmit byte request or block transfer finished */
+  if(__HAL_CEC_GET_FLAG(hcec, CEC_FLAG_TBTRF) != RESET)
+  {
+    CEC_Transmit_IT(hcec);
+  }
+
+  /* Receive byte or block transfer finished */
+  if(__HAL_CEC_GET_FLAG(hcec, CEC_FLAG_RBTF) != RESET)
+  {
+    if(hcec->RxXferSize == 0U)
+    {
+      /* reception is starting */ 
+      hcec->RxState = HAL_CEC_STATE_BUSY_RX;
+    }
+    CEC_Receive_IT(hcec);
+  }
+}
+
+
+/**
+  * @brief Tx Transfer completed callback
+  * @param hcec: CEC handle
+  * @retval None
+  */
+ __weak void HAL_CEC_TxCpltCallback(CEC_HandleTypeDef *hcec)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hcec);
+  /* NOTE : This function should not be modified, when the callback is needed,
+            the HAL_CEC_TxCpltCallback can be implemented in the user file
+   */ 
+}
+
+/**
+  * @brief Rx Transfer completed callback
+  * @param hcec: CEC handle
+  * @param RxFrameSize: Size of frame
+  * @retval None
+  */
+__weak void HAL_CEC_RxCpltCallback(CEC_HandleTypeDef *hcec, uint32_t RxFrameSize)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hcec);
+  UNUSED(RxFrameSize);
+  /* NOTE : This function should not be modified, when the callback is needed,
+            the HAL_CEC_RxCpltCallback can be implemented in the user file
+   */
+}
+
+/**
+  * @brief CEC error callbacks
+  * @param hcec: CEC handle
+  * @retval None
+  */
+ __weak void HAL_CEC_ErrorCallback(CEC_HandleTypeDef *hcec)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hcec);
+  /* NOTE : This function should not be modified, when the callback is needed,
+            the HAL_CEC_ErrorCallback can be implemented in the user file
+   */ 
+}
+/**
+  * @}
+  */
+
+/** @defgroup CEC_Exported_Functions_Group3 Peripheral Control functions 
+  *  @brief   CEC control functions 
+  *
+@verbatim   
+ ===============================================================================
+                      ##### Peripheral Control function #####
+ ===============================================================================  
+    [..]
+    This subsection provides a set of functions allowing to control the CEC.
+     (+) HAL_CEC_GetState() API can be helpful to check in run-time the state of the CEC peripheral. 
+	 (+) HAL_CEC_GetError() API can be helpful to check in run-time the error of the CEC peripheral. 
+@endverbatim
+  * @{
+  */
+/**
+  * @brief return the CEC state
+  * @param hcec: pointer to a CEC_HandleTypeDef structure that contains
+  *              the configuration information for the specified CEC module.
+  * @retval HAL state
+  */
+HAL_CEC_StateTypeDef HAL_CEC_GetState(CEC_HandleTypeDef *hcec)
+{
+  uint32_t temp1= 0x00U, temp2 = 0x00U;
+  temp1 = hcec->gState;
+  temp2 = hcec->RxState;
+  
+  return (HAL_CEC_StateTypeDef)(temp1 | temp2);
+}
+
+/**
+* @brief  Return the CEC error code
+* @param  hcec : pointer to a CEC_HandleTypeDef structure that contains
+  *              the configuration information for the specified CEC.
+* @retval CEC Error Code
+*/
+uint32_t HAL_CEC_GetError(CEC_HandleTypeDef *hcec)
+{
+  return hcec->ErrorCode;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup CEC_Private_Functions
+  * @{
+  */
+
+ /**
+  * @brief Send data in interrupt mode 
+  * @param hcec: CEC handle. 
+  *         Function called under interruption only, once
+  *         interruptions have been enabled by HAL_CEC_Transmit_IT()   
+  * @retval HAL status
+  */  
+static HAL_StatusTypeDef CEC_Transmit_IT(CEC_HandleTypeDef *hcec)
+{
+  /* if the IP is already busy or if there is a previous transmission
+     already pending due to arbitration loss */
+  if((hcec->gState == HAL_CEC_STATE_BUSY_TX) || (__HAL_CEC_GET_TRANSMISSION_START_FLAG(hcec) != RESET))
+  {
+    /* if all data have been sent */
+    if(hcec->TxXferCount == 0U)
+    {
+      /* Acknowledge successful completion by writing 0x00 */
+      MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_TRANSMIT_MASK, 0x00U);
+
+      hcec->gState = HAL_CEC_STATE_READY;
+#if (USE_HAL_CEC_REGISTER_CALLBACKS == 1)
+     hcec->TxCpltCallback(hcec);
+#else
+     HAL_CEC_TxCpltCallback(hcec);
+#endif /* USE_HAL_CEC_REGISTER_CALLBACKS */     
+      
+      return HAL_OK;
+    }
+    else
+    {
+      /* Reduce the number of bytes to transfer by one */
+      hcec->TxXferCount--;
+      
+      /* Write data to TX buffer*/
+      hcec->Instance->TXD = *hcec->pTxBuffPtr++;
+      
+      /* If this is the last byte of the ongoing transmission */
+      if(hcec->TxXferCount == 0U)
+      {
+        /* Acknowledge byte request and signal end of message */
+        MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_TRANSMIT_MASK, CEC_FLAG_TEOM);
+      }
+      else
+      {
+        /* Acknowledge byte request by writing 0x00 */
+        MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_TRANSMIT_MASK, 0x00U);
+      }  
+      
+      return HAL_OK;
+    }
+  }
+  else
+  {
+    return HAL_BUSY;   
+  }
+}
+
+/**
+  * @brief Receive data in interrupt mode. 
+  * @param hcec: CEC handle.
+  *         Function called under interruption only, once
+  *         interruptions have been enabled by HAL_CEC_Receive_IT()   
+  * @retval HAL status
+  */  
+static HAL_StatusTypeDef CEC_Receive_IT(CEC_HandleTypeDef *hcec)
+{
+  static uint32_t temp;
+  
+  if(hcec->RxState == HAL_CEC_STATE_BUSY_RX)
+  {
+    temp = hcec->Instance->CSR;
+    
+    /* Store received data */
+    hcec->RxXferSize++;
+    *hcec->Init.RxBuffer++ = hcec->Instance->RXD;
+    
+    /* Acknowledge received byte by writing 0x00 */
+    MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_RECEIVE_MASK, 0x00U);
+    
+    /* If the End Of Message is reached */
+    if(HAL_IS_BIT_SET(temp, CEC_FLAG_REOM))
+    {
+      /* Interrupts are not disabled due to transmission still ongoing */
+      hcec->RxState = HAL_CEC_STATE_READY;
+#if (USE_HAL_CEC_REGISTER_CALLBACKS == 1)
+    hcec->RxCpltCallback(hcec, hcec->RxXferSize);
+#else
+    HAL_CEC_RxCpltCallback(hcec, hcec->RxXferSize); 
+#endif /* USE_HAL_CEC_REGISTER_CALLBACKS */      
+      
+      return HAL_OK;
+    }
+    else
+    {
+      return HAL_BUSY; 
+    }
+  }
+  else
+  {
+    return HAL_BUSY; 
+  }
+}
+
+/**
+ * @}
+ */ 
+ 
+/**
+  * @}
+  */
+
+#endif /* CEC */
+
+#endif /* HAL_CEC_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/