Diff: targets/cmsis/TARGET_STM/TARGET_DISCO_F051R8/stm32f0xx_cec.c

Revision:

130:1dec54e4aec3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_DISCO_F051R8/stm32f0xx_cec.c	Fri Mar 21 11:45:09 2014 +0000
@@ -0,0 +1,617 @@
+/**
+  ******************************************************************************
+  * @file    stm32f0xx_cec.c
+  * @author  MCD Application Team
+  * @version V1.3.0
+  * @date    16-January-2014
+  * @brief   This file provides firmware functions to manage the following 
+  *          functionalities of the Consumer Electronics Control (CEC) peripheral
+  *          applicable only on STM32F051, STM32F042 and STM32F072 devices:
+  *            + Initialization and Configuration
+  *            + Data transfers functions
+  *            + Interrupts and flags management
+  *               
+  *  @verbatim
+  ==============================================================================
+                            ##### CEC features #####
+  ==============================================================================
+      [..] This device provides some features:
+           (#) Supports HDMI-CEC specification 1.4.
+           (#) Supports two source clocks(HSI/244 or LSE).
+           (#) Works in stop mode(without APB clock, but with CEC clock 32KHz).
+               It can genarate an interrupt in the CEC clock domain that the CPU 
+               wakes up from the low power mode.
+           (#) Configurable Signal Free Time before of transmission start. The 
+               number of nominal data bit periods waited before transmission can be
+               ruled by Hardware or Software.
+           (#) Configurable Peripheral Address (multi-addressing configuration).
+           (#) Supports listen mode.The CEC Messages addressed to different destination
+               can be received without interfering with CEC bus when Listen mode option is enabled.
+           (#) Configurable Rx-Tolerance(Standard and Extended tolerance margin).
+           (#) Error detection with configurable error bit generation.
+           (#) Arbitration lost error in the case of two CEC devices starting at the same time.
+
+                            ##### How to use this driver ##### 
+  ==============================================================================
+      [..] This driver provides functions to configure and program the CEC device,
+       follow steps below:
+           (#) The source clock can be configured using:
+               (++) RCC_CECCLKConfig(RCC_CECCLK_HSI_Div244) for HSI(Default) 
+               (++) RCC_CECCLKConfig(RCC_CECCLK_LSE) for LSE.
+           (#) Enable CEC peripheral clock using RCC_APBPeriphClockCmd(RCC_APBPeriph_CEC, ENABLE).
+           (#) Peripherals alternate function.
+               (++) Connect the pin to the desired peripherals' Alternate Function (AF) using 
+               GPIO_PinAFConfig() function.
+               (++) Configure the desired pin in alternate function by:
+               GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF.
+               (++) Select the type open-drain and output speed via GPIO_OType 
+               and GPIO_Speed members.
+               (++) Call GPIO_Init() function.
+           (#) Configure the Signal Free Time, Rx Tolerance, Stop reception generation 
+               and Bit error generation using the CEC_Init() function.
+               The function CEC_Init() must be called when the CEC peripheral is disabled.
+           (#) Configure the CEC own address by calling the fuction CEC_OwnAddressConfig().
+           (#) Optionally, you can configure the Listen mode using the function CEC_ListenModeCmd().
+           (#) Enable the NVIC and the corresponding interrupt using the function 
+               CEC_ITConfig() if you need to use interrupt mode.
+               CEC_ITConfig() must be called before enabling the CEC peripheral.
+           (#) Enable the CEC using the CEC_Cmd() function.
+           (#) Charge the first data byte in the TXDR register using CEC_SendDataByte().
+           (#) Enable the transmission of the Byte of a CEC message using CEC_StartOfMessage() 
+           (#) Transmit single data through the CEC peripheral using CEC_SendDataByte() 
+               and Receive the last transmitted byte using CEC_ReceiveDataByte().
+           (#) Enable the CEC_EndOfMessage() in order to indicate the last byte of the message.
+      [..]
+           (@) If the listen mode is enabled, Stop reception generation and Bit error generation 
+               must be in reset state.
+           (@) If the CEC message consists of only 1 byte, the function CEC_EndOfMessage()
+               must be called before CEC_StartOfMessage().
+  
+   @endverbatim
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f0xx_cec.h"
+#include "stm32f0xx_rcc.h"
+
+/** @addtogroup STM32F0xx_StdPeriph_Driver
+  * @{
+  */
+
+/** @defgroup CEC 
+  * @brief CEC driver modules
+  * @{
+  */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+#define BROADCAST_ADDRESS      ((uint32_t)0x0000F)
+#define CFGR_CLEAR_MASK        ((uint32_t)0x7000FE00)   /* CFGR register Mask */
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup CEC_Private_Functions 
+  * @{
+  */
+
+/** @defgroup CEC_Group1 Initialization and Configuration functions
+ *  @brief   Initialization and Configuration functions
+ *
+@verbatim  
+ ===============================================================================
+                            ##### Initialization and Configuration functions #####
+ ===============================================================================
+      [..] This section provides functions allowing to initialize:
+            (+) CEC own addresses
+            (+) CEC Signal Free Time
+            (+) CEC Rx Tolerance
+            (+) CEC Stop Reception
+            (+) CEC Bit Rising Error
+            (+) CEC Long Bit Period Error
+      [..] This section provides also a function to configure the CEC peripheral in Listen Mode.
+           Messages addressed to different destination can be received when Listen mode is 
+           enabled without interfering with CEC bus.
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Deinitializes the CEC peripheral registers to their default reset values.
+  * @param  None
+  * @retval None
+  */
+void CEC_DeInit(void)
+{
+  RCC_APB1PeriphResetCmd(RCC_APB1Periph_CEC, ENABLE);
+  RCC_APB1PeriphResetCmd(RCC_APB1Periph_CEC, DISABLE);
+}
+
+/**
+  * @brief  Initializes the CEC peripheral according to the specified parameters
+  *         in the CEC_InitStruct.
+  * @note   The CEC parameters must be configured before enabling the CEC peripheral.
+  * @param  CEC_InitStruct: pointer to an CEC_InitTypeDef structure that contains
+  *         the configuration information for the specified CEC peripheral.
+  * @retval None
+  */
+void CEC_Init(CEC_InitTypeDef* CEC_InitStruct)
+{
+  uint32_t tmpreg = 0;
+
+  /* Check the parameters */
+  assert_param(IS_CEC_SIGNAL_FREE_TIME(CEC_InitStruct->CEC_SignalFreeTime));
+  assert_param(IS_CEC_RX_TOLERANCE(CEC_InitStruct->CEC_RxTolerance));
+  assert_param(IS_CEC_STOP_RECEPTION(CEC_InitStruct->CEC_StopReception));
+  assert_param(IS_CEC_BIT_RISING_ERROR(CEC_InitStruct->CEC_BitRisingError));
+  assert_param(IS_CEC_LONG_BIT_PERIOD_ERROR(CEC_InitStruct->CEC_LongBitPeriodError));
+  assert_param(IS_CEC_BDR_NO_GEN_ERROR(CEC_InitStruct->CEC_BRDNoGen));
+  assert_param(IS_CEC_SFT_OPTION(CEC_InitStruct->CEC_SFTOption));
+
+  /* Get the CEC CFGR value */
+  tmpreg = CEC->CFGR;
+
+  /* Clear CFGR bits */
+  tmpreg &= CFGR_CLEAR_MASK;
+
+  /* Configure the CEC peripheral */
+  tmpreg |= (CEC_InitStruct->CEC_SignalFreeTime | CEC_InitStruct->CEC_RxTolerance |
+             CEC_InitStruct->CEC_StopReception  | CEC_InitStruct->CEC_BitRisingError |
+             CEC_InitStruct->CEC_LongBitPeriodError| CEC_InitStruct->CEC_BRDNoGen |
+             CEC_InitStruct->CEC_SFTOption);
+
+  /* Write to CEC CFGR  register */
+  CEC->CFGR = tmpreg;
+}
+
+/**
+  * @brief  Fills each CEC_InitStruct member with its default value.
+  * @param  CEC_InitStruct: pointer to a CEC_InitTypeDef structure which will 
+  *         be initialized.
+  * @retval None
+  */
+void CEC_StructInit(CEC_InitTypeDef* CEC_InitStruct)
+{
+  CEC_InitStruct->CEC_SignalFreeTime = CEC_SignalFreeTime_Standard;
+  CEC_InitStruct->CEC_RxTolerance = CEC_RxTolerance_Standard;
+  CEC_InitStruct->CEC_StopReception = CEC_StopReception_Off;
+  CEC_InitStruct->CEC_BitRisingError = CEC_BitRisingError_Off;
+  CEC_InitStruct->CEC_LongBitPeriodError = CEC_LongBitPeriodError_Off;
+  CEC_InitStruct->CEC_BRDNoGen = CEC_BRDNoGen_Off;
+  CEC_InitStruct->CEC_SFTOption = CEC_SFTOption_Off;
+}
+
+/**
+  * @brief  Enables or disables the CEC peripheral.
+  * @param  NewState: new state of the CEC peripheral.
+  *          This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void CEC_Cmd(FunctionalState NewState)
+{
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+  if (NewState != DISABLE)
+  {
+    /* Enable the CEC peripheral */
+    CEC->CR |= CEC_CR_CECEN;
+  }
+  else
+  {
+    /* Disable the CEC peripheral */
+    CEC->CR &= ~CEC_CR_CECEN;
+  }
+}
+
+/**
+  * @brief  Enables or disables the CEC Listen Mode.
+  * @param  NewState: new state of the Listen Mode.
+  *          This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void CEC_ListenModeCmd(FunctionalState NewState)
+{
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+  if (NewState != DISABLE)
+  {
+    /* Enable the Listen Mode */
+    CEC->CFGR |= CEC_CFGR_LSTN;
+  }
+  else
+  {
+    /* Disable the Listen Mode */
+    CEC->CFGR &= ~CEC_CFGR_LSTN;
+  }
+}
+
+/**
+  * @brief  Defines the Own Address of the CEC device.
+  * @param  CEC_OwnAddress: The CEC own address.
+  * @retval None
+  */
+void CEC_OwnAddressConfig(uint8_t CEC_OwnAddress)
+{
+  uint32_t tmp =0x00;
+  /* Check the parameters */
+  assert_param(IS_CEC_ADDRESS(CEC_OwnAddress));
+  tmp = 1 <<(CEC_OwnAddress + 16);
+  /* Set the CEC own address */
+  CEC->CFGR |= tmp;
+}
+
+/**
+  * @brief  Clears the Own Address of the CEC device.
+  * @param  CEC_OwnAddress: The CEC own address.
+  * @retval None
+  */
+void CEC_OwnAddressClear(void)
+{
+  /* Set the CEC own address */
+  CEC->CFGR = 0x0;
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup CEC_Group2 Data transfers functions
+ *  @brief    Data transfers functions
+ *
+@verbatim
+ ===============================================================================
+                            ##### Data transfers functions #####
+ ===============================================================================
+    [..] This section provides functions allowing the CEC data transfers.The read 
+         access of the CEC_RXDR register can be done using the CEC_ReceiveData()function 
+         and returns the Rx buffered value. Whereas a write access to the CEC_TXDR can be 
+         done using CEC_SendData() function.
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Transmits single data through the CEC peripheral.
+  * @param  Data: the data to transmit.
+  * @retval None
+  */
+void CEC_SendData(uint8_t Data)
+{
+  /* Transmit Data */
+  CEC->TXDR = Data;
+}
+
+/**
+  * @brief  Returns the most recent received data by the CEC peripheral.
+  * @param  None
+  * @retval The received data.
+  */
+uint8_t CEC_ReceiveData(void)
+{
+  /* Receive Data */
+  return (uint8_t)(CEC->RXDR);
+}
+
+/**
+  * @brief  Starts a new message.
+  * @param  None
+  * @retval None
+  */
+void CEC_StartOfMessage(void)
+{
+  /* Starts of new message */
+  CEC->CR |= CEC_CR_TXSOM; 
+}
+
+/**
+  * @brief  Transmits message with an EOM bit.
+  * @param  None
+  * @retval None
+  */
+void CEC_EndOfMessage(void)
+{
+  /* The data byte will be transmitted with an EOM bit */
+  CEC->CR |= CEC_CR_TXEOM;
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup CEC_Group3 Interrupts and flags management functions
+ *  @brief    Interrupts and flags management functions
+*
+@verbatim
+ ===============================================================================
+                            ##### Interrupts and flags management functions ##### 
+ ===============================================================================
+    [..] This section provides functions allowing to configure the CEC Interrupts
+         sources and check or clear the flags or pending bits status.
+    [..] The user should identify which mode will be used in his application to manage
+         the communication: Polling mode or Interrupt mode.
+  
+    [..] In polling mode, the CEC can be managed by the following flags:
+            (+) CEC_FLAG_TXACKE : to indicate a missing acknowledge in transmission mode.
+            (+) CEC_FLAG_TXERR  : to indicate an error occurs during transmission mode.
+                                  The initiator detects low impedance in the CEC line.
+            (+) CEC_FLAG_TXUDR  : to indicate if an underrun error occurs in transmission mode.
+                                  The transmission is enabled while the software has not yet 
+                                  loaded any value into the TXDR register.
+            (+) CEC_FLAG_TXEND  : to indicate the end of successful transmission.
+            (+) CEC_FLAG_TXBR   : to indicate the next transmission data has to be written to TXDR.
+            (+) CEC_FLAG_ARBLST : to indicate arbitration lost in the case of two CEC devices
+                                  starting at the same time.
+            (+) CEC_FLAG_RXACKE : to indicate a missing acknowledge in receive mode.
+            (+) CEC_FLAG_LBPE   : to indicate a long bit period error generated during receive mode.
+            (+) CEC_FLAG_SBPE   : to indicate a short bit period error generated during receive mode.
+            (+) CEC_FLAG_BRE    : to indicate a bit rising error generated during receive mode.
+            (+) CEC_FLAG_RXOVR  : to indicate if an overrun error occur while receiving a CEC message.
+                                  A byte is not yet received while a new byte is stored in the RXDR register.
+            (+) CEC_FLAG_RXEND  : to indicate the end Of reception
+            (+) CEC_FLAG_RXBR   : to indicate a new byte has been received from the CEC line and 
+                                  stored into the RXDR buffer.
+    [..]
+           (@)In this Mode, it is advised to use the following functions:
+              FlagStatus CEC_GetFlagStatus(uint16_t CEC_FLAG);
+              void CEC_ClearFlag(uint16_t CEC_FLAG);
+
+    [..] In Interrupt mode, the CEC can be managed by the following interrupt sources:
+           (+) CEC_IT_TXACKE : to indicate a TX Missing acknowledge 
+           (+) CEC_IT_TXACKE : to indicate a missing acknowledge in transmission mode.
+           (+) CEC_IT_TXERR  : to indicate an error occurs during transmission mode.
+                               The initiator detects low impedance in the CEC line.
+           (+) CEC_IT_TXUDR  : to indicate if an underrun error occurs in transmission mode.
+                               The transmission is enabled while the software has not yet 
+                               loaded any value into the TXDR register.
+           (+) CEC_IT_TXEND  : to indicate the end of successful transmission.
+           (+) CEC_IT_TXBR   : to indicate the next transmission data has to be written to TXDR register.
+           (+) CEC_IT_ARBLST : to indicate arbitration lost in the case of two CEC devices
+                                starting at the same time.
+           (+) CEC_IT_RXACKE : to indicate a missing acknowledge in receive mode.
+           (+) CEC_IT_LBPE   : to indicate a long bit period error generated during receive mode.
+           (+) CEC_IT_SBPE   : to indicate a short bit period error generated during receive mode.
+           (+) CEC_IT_BRE    : to indicate a bit rising error generated during receive mode.
+           (+) CEC_IT_RXOVR  : to indicate if an overrun error occur while receiving a CEC message.
+                               A byte is not yet received while a new byte is stored in the RXDR register.
+           (+) CEC_IT_RXEND  : to indicate the end Of reception
+           (+) CEC_IT_RXBR   : to indicate a new byte has been received from the CEC line and 
+                                stored into the RXDR buffer.
+    [..]
+           (@)In this Mode it is advised to use the following functions:
+              void CEC_ITConfig( uint16_t CEC_IT, FunctionalState NewState);
+              ITStatus CEC_GetITStatus(uint16_t CEC_IT);
+              void CEC_ClearITPendingBit(uint16_t CEC_IT);
+              
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Enables or disables the selected CEC interrupts.
+  * @param  CEC_IT: specifies the CEC interrupt source to be enabled.
+  *          This parameter can be any combination of the following values:
+  *            @arg CEC_IT_TXACKE: Tx Missing acknowledge Error
+  *            @arg CEC_IT_TXERR: Tx Error.
+  *            @arg CEC_IT_TXUDR: Tx-Buffer Underrun.
+  *            @arg CEC_IT_TXEND: End of Transmission (successful transmission of the last byte).
+  *            @arg CEC_IT_TXBR: Tx-Byte Request.
+  *            @arg CEC_IT_ARBLST: Arbitration Lost
+  *            @arg CEC_IT_RXACKE: Rx-Missing Acknowledge
+  *            @arg CEC_IT_LBPE: Rx Long period Error
+  *            @arg CEC_IT_SBPE: Rx Short period Error
+  *            @arg CEC_IT_BRE: Rx Bit Rising Error
+  *            @arg CEC_IT_RXOVR: Rx Overrun.
+  *            @arg CEC_IT_RXEND: End Of Reception
+  *            @arg CEC_IT_RXBR: Rx-Byte Received
+  * @param  NewState: new state of the selected CEC interrupts.
+  *          This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void CEC_ITConfig(uint16_t CEC_IT, FunctionalState NewState)
+{
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  assert_param(IS_CEC_IT(CEC_IT));
+
+  if (NewState != DISABLE)
+  {
+    /* Enable the selected CEC interrupt */
+    CEC->IER |= CEC_IT;
+  }
+  else
+  {
+    CEC_IT =~CEC_IT;
+    /* Disable the selected CEC interrupt */
+    CEC->IER &= CEC_IT;
+  }
+}
+
+/**
+  * @brief  Gets the CEC flag status.
+  * @param  CEC_FLAG: specifies the CEC flag to check.
+  *     This parameter can be one of the following values:
+  *            @arg CEC_FLAG_TXACKE: Tx Missing acknowledge Error
+  *            @arg CEC_FLAG_TXERR: Tx Error.
+  *            @arg CEC_FLAG_TXUDR: Tx-Buffer Underrun.
+  *            @arg CEC_FLAG_TXEND: End of transmission (successful transmission of the last byte).
+  *            @arg CEC_FLAG_TXBR: Tx-Byte Request.
+  *            @arg CEC_FLAG_ARBLST: Arbitration Lost
+  *            @arg CEC_FLAG_RXACKE: Rx-Missing Acknowledge 
+  *            @arg CEC_FLAG_LBPE: Rx Long period Error
+  *            @arg CEC_FLAG_SBPE: Rx Short period Error
+  *            @arg CEC_FLAG_BRE: Rx Bit Rissing Error
+  *            @arg CEC_FLAG_RXOVR: Rx Overrun.
+  *            @arg CEC_FLAG_RXEND: End Of Reception.
+  *            @arg CEC_FLAG_RXBR: Rx-Byte Received.
+  * @retval The new state of CEC_FLAG (SET or RESET)
+  */
+FlagStatus CEC_GetFlagStatus(uint16_t CEC_FLAG) 
+{
+  FlagStatus bitstatus = RESET;
+  
+  assert_param(IS_CEC_GET_FLAG(CEC_FLAG));
+  
+  /* Check the status of the specified CEC flag */
+  if ((CEC->ISR & CEC_FLAG) != (uint16_t)RESET)
+  {
+    /* CEC flag is set */
+    bitstatus = SET;
+  }
+  else
+  {
+    /* CEC flag is reset */
+    bitstatus = RESET;
+  }
+
+  /* Return the CEC flag status */
+  return  bitstatus;
+}
+
+/**
+  * @brief  Clears the CEC's pending flags.
+  * @param  CEC_FLAG: specifies the flag to clear. 
+  *          This parameter can be any combination of the following values:
+  *            @arg CEC_FLAG_TXACKE: Tx Missing acknowledge Error
+  *            @arg CEC_FLAG_TXERR: Tx Error
+  *            @arg CEC_FLAG_TXUDR: Tx-Buffer Underrun
+  *            @arg CEC_FLAG_TXEND: End of transmission (successful transmission of the last byte).
+  *            @arg CEC_FLAG_TXBR: Tx-Byte Request
+  *            @arg CEC_FLAG_ARBLST: Arbitration Lost
+  *            @arg CEC_FLAG_RXACKE: Rx Missing Acknowledge 
+  *            @arg CEC_FLAG_LBPE: Rx Long period Error
+  *            @arg CEC_FLAG_SBPE: Rx Short period Error
+  *            @arg CEC_FLAG_BRE: Rx Bit Rising Error
+  *            @arg CEC_FLAG_RXOVR: Rx Overrun
+  *            @arg CEC_FLAG_RXEND: End Of Reception
+  *            @arg CEC_FLAG_RXBR: Rx-Byte Received
+  * @retval None
+  */
+void CEC_ClearFlag(uint32_t CEC_FLAG)
+{
+  assert_param(IS_CEC_CLEAR_FLAG(CEC_FLAG));
+
+  /* Clear the selected CEC flag */
+  CEC->ISR = CEC_FLAG;
+}
+
+/**
+  * @brief  Checks whether the specified CEC interrupt has occurred or not.
+  * @param  CEC_IT: specifies the CEC interrupt source to check. 
+  *          This parameter can be one of the following values:
+  *            @arg CEC_IT_TXACKE: Tx Missing acknowledge Error
+  *            @arg CEC_IT_TXERR: Tx Error.
+  *            @arg CEC_IT_TXUDR: Tx-Buffer Underrun.
+  *            @arg CEC_IT_TXEND: End of transmission (successful transmission of the last byte).
+  *            @arg CEC_IT_TXBR: Tx-Byte Request.
+  *            @arg CEC_IT_ARBLST: Arbitration Lost.
+  *            @arg CEC_IT_RXACKE: Rx-Missing Acknowledge.
+  *            @arg CEC_IT_LBPE: Rx Long period Error.
+  *            @arg CEC_IT_SBPE: Rx Short period Error.
+  *            @arg CEC_IT_BRE: Rx Bit Rising Error.
+  *            @arg CEC_IT_RXOVR: Rx Overrun.
+  *            @arg CEC_IT_RXEND: End Of Reception.
+  *            @arg CEC_IT_RXBR: Rx-Byte Received 
+  * @retval The new state of CEC_IT (SET or RESET).
+  */
+ITStatus CEC_GetITStatus(uint16_t CEC_IT)
+{
+  ITStatus bitstatus = RESET;
+  uint32_t enablestatus = 0;
+
+  /* Check the parameters */
+  assert_param(IS_CEC_GET_IT(CEC_IT));
+
+  /* Get the CEC IT enable bit status */
+  enablestatus = (CEC->IER & CEC_IT);
+
+  /* Check the status of the specified CEC interrupt */
+  if (((CEC->ISR & CEC_IT) != (uint32_t)RESET) && enablestatus)
+  {
+    /* CEC interrupt is set */
+    bitstatus = SET;
+  }
+  else
+  {
+    /* CEC interrupt is reset */
+    bitstatus = RESET;
+  }
+
+  /* Return the CEC interrupt status */
+  return  bitstatus;
+}
+
+/**
+  * @brief  Clears the CEC's interrupt pending bits.
+  * @param  CEC_IT: specifies the CEC interrupt pending bit to clear.
+  *          This parameter can be any combination of the following values:
+  *            @arg CEC_IT_TXACKE: Tx Missing acknowledge Error
+  *            @arg CEC_IT_TXERR: Tx Error
+  *            @arg CEC_IT_TXUDR: Tx-Buffer Underrun
+  *            @arg CEC_IT_TXEND: End of Transmission
+  *            @arg CEC_IT_TXBR: Tx-Byte Request
+  *            @arg CEC_IT_ARBLST: Arbitration Lost
+  *            @arg CEC_IT_RXACKE: Rx-Missing Acknowledge
+  *            @arg CEC_IT_LBPE: Rx Long period Error
+  *            @arg CEC_IT_SBPE: Rx Short period Error
+  *            @arg CEC_IT_BRE: Rx Bit Rising Error
+  *            @arg CEC_IT_RXOVR: Rx Overrun
+  *            @arg CEC_IT_RXEND: End Of Reception
+  *            @arg CEC_IT_RXBR: Rx-Byte Received
+  * @retval None
+  */
+void CEC_ClearITPendingBit(uint16_t CEC_IT)
+{
+  assert_param(IS_CEC_IT(CEC_IT));
+
+  /* Clear the selected CEC interrupt pending bits */
+  CEC->ISR = CEC_IT;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/