Diff: targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/stm32f10x_i2c.c

Revision:

52:a51c77007319

Child:

70:c1fbde68b492

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/stm32f10x_i2c.c	Mon Dec 02 11:30:05 2013 +0000
@@ -0,0 +1,1331 @@
+/**
+  ******************************************************************************
+  * @file    stm32f10x_i2c.c
+  * @author  MCD Application Team
+  * @version V3.5.0
+  * @date    11-March-2011
+  * @brief   This file provides all the I2C firmware functions.
+  ******************************************************************************
+  * @attention
+  *
+  * 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, STMICROELECTRONICS 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 2011 STMicroelectronics</center></h2>
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f10x_i2c.h"
+#include "stm32f10x_rcc.h"
+
+
+/** @addtogroup STM32F10x_StdPeriph_Driver
+  * @{
+  */
+
+/** @defgroup I2C 
+  * @brief I2C driver modules
+  * @{
+  */ 
+
+/** @defgroup I2C_Private_TypesDefinitions
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @defgroup I2C_Private_Defines
+  * @{
+  */
+
+/* I2C SPE mask */
+#define CR1_PE_Set              ((uint16_t)0x0001)
+#define CR1_PE_Reset            ((uint16_t)0xFFFE)
+
+/* I2C START mask */
+#define CR1_START_Set           ((uint16_t)0x0100)
+#define CR1_START_Reset         ((uint16_t)0xFEFF)
+
+/* I2C STOP mask */
+#define CR1_STOP_Set            ((uint16_t)0x0200)
+#define CR1_STOP_Reset          ((uint16_t)0xFDFF)
+
+/* I2C ACK mask */
+#define CR1_ACK_Set             ((uint16_t)0x0400)
+#define CR1_ACK_Reset           ((uint16_t)0xFBFF)
+
+/* I2C ENGC mask */
+#define CR1_ENGC_Set            ((uint16_t)0x0040)
+#define CR1_ENGC_Reset          ((uint16_t)0xFFBF)
+
+/* I2C SWRST mask */
+#define CR1_SWRST_Set           ((uint16_t)0x8000)
+#define CR1_SWRST_Reset         ((uint16_t)0x7FFF)
+
+/* I2C PEC mask */
+#define CR1_PEC_Set             ((uint16_t)0x1000)
+#define CR1_PEC_Reset           ((uint16_t)0xEFFF)
+
+/* I2C ENPEC mask */
+#define CR1_ENPEC_Set           ((uint16_t)0x0020)
+#define CR1_ENPEC_Reset         ((uint16_t)0xFFDF)
+
+/* I2C ENARP mask */
+#define CR1_ENARP_Set           ((uint16_t)0x0010)
+#define CR1_ENARP_Reset         ((uint16_t)0xFFEF)
+
+/* I2C NOSTRETCH mask */
+#define CR1_NOSTRETCH_Set       ((uint16_t)0x0080)
+#define CR1_NOSTRETCH_Reset     ((uint16_t)0xFF7F)
+
+/* I2C registers Masks */
+#define CR1_CLEAR_Mask          ((uint16_t)0xFBF5)
+
+/* I2C DMAEN mask */
+#define CR2_DMAEN_Set           ((uint16_t)0x0800)
+#define CR2_DMAEN_Reset         ((uint16_t)0xF7FF)
+
+/* I2C LAST mask */
+#define CR2_LAST_Set            ((uint16_t)0x1000)
+#define CR2_LAST_Reset          ((uint16_t)0xEFFF)
+
+/* I2C FREQ mask */
+#define CR2_FREQ_Reset          ((uint16_t)0xFFC0)
+
+/* I2C ADD0 mask */
+#define OAR1_ADD0_Set           ((uint16_t)0x0001)
+#define OAR1_ADD0_Reset         ((uint16_t)0xFFFE)
+
+/* I2C ENDUAL mask */
+#define OAR2_ENDUAL_Set         ((uint16_t)0x0001)
+#define OAR2_ENDUAL_Reset       ((uint16_t)0xFFFE)
+
+/* I2C ADD2 mask */
+#define OAR2_ADD2_Reset         ((uint16_t)0xFF01)
+
+/* I2C F/S mask */
+#define CCR_FS_Set              ((uint16_t)0x8000)
+
+/* I2C CCR mask */
+#define CCR_CCR_Set             ((uint16_t)0x0FFF)
+
+/* I2C FLAG mask */
+#define FLAG_Mask               ((uint32_t)0x00FFFFFF)
+
+/* I2C Interrupt Enable mask */
+#define ITEN_Mask               ((uint32_t)0x07000000)
+
+/**
+  * @}
+  */
+
+/** @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));
+
+  if (I2Cx == I2C1)
+  {
+    /* Enable I2C1 reset state */
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
+    /* Release I2C1 from reset state */
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
+  }
+  else
+  {
+    /* Enable I2C2 reset state */
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
+    /* Release I2C2 from reset state */
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
+  }
+}
+
+/**
+  * @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, freqrange = 0;
+  uint16_t result = 0x04;
+  uint32_t pclk1 = 8000000;
+  RCC_ClocksTypeDef  rcc_clocks;
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));
+  assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
+  assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));
+  assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));
+  assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));
+  assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));
+
+/*---------------------------- I2Cx CR2 Configuration ------------------------*/
+  /* Get the I2Cx CR2 value */
+  tmpreg = I2Cx->CR2;
+  /* Clear frequency FREQ[5:0] bits */
+  tmpreg &= CR2_FREQ_Reset;
+  /* Get pclk1 frequency value */
+  RCC_GetClocksFreq(&rcc_clocks);
+  pclk1 = rcc_clocks.PCLK1_Frequency;
+  /* Set frequency bits depending on pclk1 value */
+  freqrange = (uint16_t)(pclk1 / 1000000);
+  tmpreg |= freqrange;
+  /* Write to I2Cx CR2 */
+  I2Cx->CR2 = tmpreg;
+
+/*---------------------------- I2Cx CCR Configuration ------------------------*/
+  /* Disable the selected I2C peripheral to configure TRISE */
+  I2Cx->CR1 &= CR1_PE_Reset;
+  /* Reset tmpreg value */
+  /* Clear F/S, DUTY and CCR[11:0] bits */
+  tmpreg = 0;
+
+  /* Configure speed in standard mode */
+  if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
+  {
+    /* Standard mode speed calculate */
+    result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1));
+    /* Test if CCR value is under 0x4*/
+    if (result < 0x04)
+    {
+      /* Set minimum allowed value */
+      result = 0x04;  
+    }
+    /* Set speed value for standard mode */
+    tmpreg |= result;	  
+    /* Set Maximum Rise Time for standard mode */
+    I2Cx->TRISE = freqrange + 1; 
+  }
+  /* Configure speed in fast mode */
+  else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
+  {
+    if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
+    {
+      /* Fast mode speed calculate: Tlow/Thigh = 2 */
+      result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));
+    }
+    else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/
+    {
+      /* Fast mode speed calculate: Tlow/Thigh = 16/9 */
+      result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));
+      /* Set DUTY bit */
+      result |= I2C_DutyCycle_16_9;
+    }
+
+    /* Test if CCR value is under 0x1*/
+    if ((result & CCR_CCR_Set) == 0)
+    {
+      /* Set minimum allowed value */
+      result |= (uint16_t)0x0001;  
+    }
+    /* Set speed value and set F/S bit for fast mode */
+    tmpreg |= (uint16_t)(result | CCR_FS_Set);
+    /* Set Maximum Rise Time for fast mode */
+    I2Cx->TRISE = (uint16_t)(((freqrange * (uint16_t)300) / (uint16_t)1000) + (uint16_t)1);  
+  }
+
+  /* Write to I2Cx CCR */
+  I2Cx->CCR = tmpreg;
+  /* Enable the selected I2C peripheral */
+  I2Cx->CR1 |= CR1_PE_Set;
+
+/*---------------------------- I2Cx CR1 Configuration ------------------------*/
+  /* Get the I2Cx CR1 value */
+  tmpreg = I2Cx->CR1;
+  /* Clear ACK, SMBTYPE and  SMBUS bits */
+  tmpreg &= CR1_CLEAR_Mask;
+  /* Configure I2Cx: mode and acknowledgement */
+  /* Set SMBTYPE and SMBUS bits according to I2C_Mode value */
+  /* Set ACK bit according to I2C_Ack value */
+  tmpreg |= (uint16_t)((uint32_t)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);
+  /* Write to I2Cx CR1 */
+  I2Cx->CR1 = tmpreg;
+
+/*---------------------------- I2Cx OAR1 Configuration -----------------------*/
+  /* Set I2Cx Own Address1 and acknowledged address */
+  I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1);
+}
+
+/**
+  * @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_ClockSpeed member */
+  I2C_InitStruct->I2C_ClockSpeed = 5000;
+  /* Initialize the I2C_Mode member */
+  I2C_InitStruct->I2C_Mode = I2C_Mode_I2C;
+  /* Initialize the I2C_DutyCycle member */
+  I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2;
+  /* Initialize the I2C_OwnAddress1 member */
+  I2C_InitStruct->I2C_OwnAddress1 = 0;
+  /* Initialize the I2C_Ack member */
+  I2C_InitStruct->I2C_Ack = I2C_Ack_Disable;
+  /* Initialize the I2C_AcknowledgedAddress member */
+  I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
+}
+
+/**
+  * @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->CR1 |= CR1_PE_Set;
+  }
+  else
+  {
+    /* Disable the selected I2C peripheral */
+    I2Cx->CR1 &= CR1_PE_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  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 */
+    I2Cx->CR2 |= CR2_DMAEN_Set;
+  }
+  else
+  {
+    /* Disable the selected I2C DMA requests */
+    I2Cx->CR2 &= CR2_DMAEN_Reset;
+  }
+}
+
+/**
+  * @brief  Specifies if the next DMA transfer will be the last one.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  NewState: new state of the I2C DMA last transfer.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  if (NewState != DISABLE)
+  {
+    /* Next DMA transfer is the last transfer */
+    I2Cx->CR2 |= CR2_LAST_Set;
+  }
+  else
+  {
+    /* Next DMA transfer is not the last transfer */
+    I2Cx->CR2 &= CR2_LAST_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->CR1 |= CR1_START_Set;
+  }
+  else
+  {
+    /* Disable the START condition generation */
+    I2Cx->CR1 &= CR1_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->CR1 |= CR1_STOP_Set;
+  }
+  else
+  {
+    /* Disable the STOP condition generation */
+    I2Cx->CR1 &= CR1_STOP_Reset;
+  }
+}
+
+/**
+  * @brief  Enables or disables the specified I2C acknowledge feature.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  NewState: new state of the I2C Acknowledgement.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None.
+  */
+void I2C_AcknowledgeConfig(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 acknowledgement */
+    I2Cx->CR1 |= CR1_ACK_Set;
+  }
+  else
+  {
+    /* Disable the acknowledgement */
+    I2Cx->CR1 &= CR1_ACK_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)
+{
+  uint16_t tmpreg = 0;
+
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+
+  /* Get the old register value */
+  tmpreg = I2Cx->OAR2;
+
+  /* Reset I2Cx Own address2 bit [7:1] */
+  tmpreg &= OAR2_ADD2_Reset;
+
+  /* Set I2Cx Own address2 */
+  tmpreg |= (uint16_t)((uint16_t)Address & (uint16_t)0x00FE);
+
+  /* Store the new register value */
+  I2Cx->OAR2 = 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->OAR2 |= OAR2_ENDUAL_Set;
+  }
+  else
+  {
+    /* Disable dual addressing mode */
+    I2Cx->OAR2 &= OAR2_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->CR1 |= CR1_ENGC_Set;
+  }
+  else
+  {
+    /* Disable generall call */
+    I2Cx->CR1 &= CR1_ENGC_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_BUF: Buffer interrupt mask
+  *     @arg I2C_IT_EVT: Event interrupt mask
+  *     @arg I2C_IT_ERR: Error 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 (NewState != DISABLE)
+  {
+    /* Enable the selected I2C interrupts */
+    I2Cx->CR2 |= I2C_IT;
+  }
+  else
+  {
+    /* Disable the selected I2C interrupts */
+    I2Cx->CR2 &= (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 DR register the data to be sent */
+  I2Cx->DR = 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.
+  */
+uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  /* Return the data in the DR register */
+  return (uint8_t)I2Cx->DR;
+}
+
+/**
+  * @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)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_DIRECTION(I2C_Direction));
+  /* Test on the direction to set/reset the read/write bit */
+  if (I2C_Direction != I2C_Direction_Transmitter)
+  {
+    /* Set the address bit0 for read */
+    Address |= OAR1_ADD0_Set;
+  }
+  else
+  {
+    /* Reset the address bit0 for write */
+    Address &= OAR1_ADD0_Reset;
+  }
+  /* Send the address */
+  I2Cx->DR = Address;
+}
+
+/**
+  * @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:
+  *     @arg I2C_Register_CR1:  CR1 register.
+  *     @arg I2C_Register_CR2:   CR2 register.
+  *     @arg I2C_Register_OAR1:  OAR1 register.
+  *     @arg I2C_Register_OAR2:  OAR2 register.
+  *     @arg I2C_Register_DR:    DR register.
+  *     @arg I2C_Register_SR1:   SR1 register.
+  *     @arg I2C_Register_SR2:   SR2 register.
+  *     @arg I2C_Register_CCR:   CCR register.
+  *     @arg I2C_Register_TRISE: TRISE register.
+  * @retval The value of the read register.
+  */
+uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register)
+{
+  __IO uint32_t tmp = 0;
+
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_REGISTER(I2C_Register));
+
+  tmp = (uint32_t) I2Cx;
+  tmp += I2C_Register;
+
+  /* Return the selected register value */
+  return (*(__IO uint16_t *) tmp);
+}
+
+/**
+  * @brief  Enables or disables the specified I2C software reset.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  NewState: new state of the I2C software reset.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  if (NewState != DISABLE)
+  {
+    /* Peripheral under reset */
+    I2Cx->CR1 |= CR1_SWRST_Set;
+  }
+  else
+  {
+    /* Peripheral not under reset */
+    I2Cx->CR1 &= CR1_SWRST_Reset;
+  }
+}
+
+/**
+  * @brief  Selects the specified I2C NACK position in master receiver mode.
+  *         This function is useful in I2C Master Receiver mode when the number
+  *         of data to be received is equal to 2. In this case, this function 
+  *         should be called (with parameter I2C_NACKPosition_Next) before data 
+  *         reception starts,as described in the 2-byte reception procedure 
+  *         recommended in Reference Manual in Section: Master receiver.                
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  I2C_NACKPosition: specifies the NACK position. 
+  *   This parameter can be one of the following values:
+  *     @arg I2C_NACKPosition_Next: indicates that the next byte will be the last
+  *          received byte.  
+  *     @arg I2C_NACKPosition_Current: indicates that current byte is the last 
+  *          received byte.
+  *            
+  * @note    This function configures the same bit (POS) as I2C_PECPositionConfig() 
+  *          but is intended to be used in I2C mode while I2C_PECPositionConfig() 
+  *          is intended to used in SMBUS mode. 
+  *            
+  * @retval None
+  */
+void I2C_NACKPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_NACKPosition)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_NACK_POSITION(I2C_NACKPosition));
+  
+  /* Check the input parameter */
+  if (I2C_NACKPosition == I2C_NACKPosition_Next)
+  {
+    /* Next byte in shift register is the last received byte */
+    I2Cx->CR1 |= I2C_NACKPosition_Next;
+  }
+  else
+  {
+    /* Current byte in shift register is the last received byte */
+    I2Cx->CR1 &= I2C_NACKPosition_Current;
+  }
+}
+
+/**
+  * @brief  Drives the SMBusAlert pin high or low for the specified I2C.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  I2C_SMBusAlert: specifies SMBAlert pin level. 
+  *   This parameter can be one of the following values:
+  *     @arg I2C_SMBusAlert_Low: SMBAlert pin driven low
+  *     @arg I2C_SMBusAlert_High: SMBAlert pin driven high
+  * @retval None
+  */
+void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_SMBUS_ALERT(I2C_SMBusAlert));
+  if (I2C_SMBusAlert == I2C_SMBusAlert_Low)
+  {
+    /* Drive the SMBusAlert pin Low */
+    I2Cx->CR1 |= I2C_SMBusAlert_Low;
+  }
+  else
+  {
+    /* Drive the SMBusAlert pin High  */
+    I2Cx->CR1 &= I2C_SMBusAlert_High;
+  }
+}
+
+/**
+  * @brief  Enables or disables the specified I2C PEC transfer.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  NewState: new state of the I2C PEC transmission.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void I2C_TransmitPEC(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 PEC transmission */
+    I2Cx->CR1 |= CR1_PEC_Set;
+  }
+  else
+  {
+    /* Disable the selected I2C PEC transmission */
+    I2Cx->CR1 &= CR1_PEC_Reset;
+  }
+}
+
+/**
+  * @brief  Selects the specified I2C PEC position.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  I2C_PECPosition: specifies the PEC position. 
+  *   This parameter can be one of the following values:
+  *     @arg I2C_PECPosition_Next: indicates that the next byte is PEC
+  *     @arg I2C_PECPosition_Current: indicates that current byte is PEC
+  *       
+  * @note    This function configures the same bit (POS) as I2C_NACKPositionConfig()
+  *          but is intended to be used in SMBUS mode while I2C_NACKPositionConfig() 
+  *          is intended to used in I2C mode.
+  *               
+  * @retval None
+  */
+void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_PEC_POSITION(I2C_PECPosition));
+  if (I2C_PECPosition == I2C_PECPosition_Next)
+  {
+    /* Next byte in shift register is PEC */
+    I2Cx->CR1 |= I2C_PECPosition_Next;
+  }
+  else
+  {
+    /* Current byte in shift register is PEC */
+    I2Cx->CR1 &= I2C_PECPosition_Current;
+  }
+}
+
+/**
+  * @brief  Enables or disables the PEC value calculation of the transferred bytes.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  NewState: new state of the I2Cx PEC value calculation.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void I2C_CalculatePEC(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 PEC calculation */
+    I2Cx->CR1 |= CR1_ENPEC_Set;
+  }
+  else
+  {
+    /* Disable the selected I2C PEC calculation */
+    I2Cx->CR1 &= CR1_ENPEC_Reset;
+  }
+}
+
+/**
+  * @brief  Returns the PEC value for the specified I2C.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @retval The PEC value.
+  */
+uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  /* Return the selected I2C PEC value */
+  return ((I2Cx->SR2) >> 8);
+}
+
+/**
+  * @brief  Enables or disables the specified I2C ARP.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  NewState: new state of the I2Cx ARP. 
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void I2C_ARPCmd(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 ARP */
+    I2Cx->CR1 |= CR1_ENARP_Set;
+  }
+  else
+  {
+    /* Disable the selected I2C ARP */
+    I2Cx->CR1 &= CR1_ENARP_Reset;
+  }
+}
+
+/**
+  * @brief  Enables or disables the specified I2C Clock stretching.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  NewState: new state of the I2Cx Clock stretching.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void I2C_StretchClockCmd(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 Clock stretching */
+    I2Cx->CR1 |= CR1_NOSTRETCH_Set;
+  }
+  else
+  {
+    /* Disable the selected I2C Clock stretching */
+    I2Cx->CR1 &= CR1_NOSTRETCH_Reset;
+  }
+}
+
+/**
+  * @brief  Selects the specified I2C fast mode duty cycle.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  * @param  I2C_DutyCycle: specifies the fast mode duty cycle.
+  *   This parameter can be one of the following values:
+  *     @arg I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2
+  *     @arg I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9
+  * @retval None
+  */
+void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle)
+{
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_DUTY_CYCLE(I2C_DutyCycle));
+  if (I2C_DutyCycle != I2C_DutyCycle_16_9)
+  {
+    /* I2C fast mode Tlow/Thigh=2 */
+    I2Cx->CCR &= I2C_DutyCycle_2;
+  }
+  else
+  {
+    /* I2C fast mode Tlow/Thigh=16/9 */
+    I2Cx->CCR |= I2C_DutyCycle_16_9;
+  }
+}
+
+
+
+/**
+ * @brief
+ ****************************************************************************************
+ *
+ *                         I2C State Monitoring Functions
+ *                       
+ ****************************************************************************************   
+ * This I2C driver provides three different ways for I2C state monitoring
+ *  depending on the application requirements and constraints:
+ *        
+ *  
+ * 1) Basic state monitoring:
+ *    Using I2C_CheckEvent() function:
+ *    It compares the status registers (SR1 and SR2) content to a given event
+ *    (can be the combination of one or more flags).
+ *    It returns SUCCESS if the current status includes the given flags 
+ *    and returns ERROR if one or more flags are missing in the current status.
+ *    - When to use:
+ *      - This function is suitable for most applications as well as for startup 
+ *      activity since the events are fully described in the product reference manual 
+ *      (RM0008).
+ *      - It is also suitable for users who need to define their own events.
+ *    - Limitations:
+ *      - If an error occurs (ie. error flags are set besides to the monitored flags),
+ *        the I2C_CheckEvent() function may return SUCCESS despite the communication
+ *        hold or corrupted real state. 
+ *        In this case, it is advised to use error interrupts to monitor the error
+ *        events and handle them in the interrupt IRQ handler.
+ *        
+ *        @note 
+ *        For error management, it is advised to use the following functions:
+ *          - I2C_ITConfig() to configure and enable the error interrupts (I2C_IT_ERR).
+ *          - I2Cx_ER_IRQHandler() which is called when the error interrupt occurs.
+ *            Where x is the peripheral instance (I2C1, I2C2 ...)
+ *          - I2C_GetFlagStatus() or I2C_GetITStatus() to be called into I2Cx_ER_IRQHandler() 
+ *            in order to determine which error occured.
+ *          - I2C_ClearFlag() or I2C_ClearITPendingBit() and/or I2C_SoftwareResetCmd()
+ *            and/or I2C_GenerateStop() in order to clear the error flag and source,
+ *            and return to correct communication status.
+ *            
+ *
+ *  2) Advanced state monitoring:
+ *     Using the function I2C_GetLastEvent() which returns the image of both status 
+ *     registers in a single word (uint32_t) (Status Register 2 value is shifted left 
+ *     by 16 bits and concatenated to Status Register 1).
+ *     - When to use:
+ *       - This function is suitable for the same applications above but it allows to
+ *         overcome the mentioned limitation of I2C_GetFlagStatus() function.
+ *         The returned value could be compared to events already defined in the 
+ *         library (stm32f10x_i2c.h) or to custom values defined by user.
+ *       - This function is suitable when multiple flags are monitored at the same time.
+ *       - At the opposite of I2C_CheckEvent() function, this function allows user to
+ *         choose when an event is accepted (when all events flags are set and no 
+ *         other flags are set or just when the needed flags are set like 
+ *         I2C_CheckEvent() function).
+ *     - Limitations:
+ *       - User may need to define his own events.
+ *       - Same remark concerning the error management is applicable for this 
+ *         function if user decides to check only regular communication flags (and 
+ *         ignores error flags).
+ *     
+ *
+ *  3) Flag-based state monitoring:
+ *     Using the function I2C_GetFlagStatus() which simply returns the status of 
+ *     one single flag (ie. I2C_FLAG_RXNE ...). 
+ *     - When to use:
+ *        - This function could be used for specific applications or in debug phase.
+ *        - It is suitable when only one flag checking is needed (most I2C events 
+ *          are monitored through multiple flags).
+ *     - Limitations: 
+ *        - When calling this function, the Status register is accessed. Some flags are
+ *          cleared when the status register is accessed. So checking the status
+ *          of one Flag, may clear other ones.
+ *        - Function may need to be called twice or more in order to monitor one 
+ *          single event.
+ *
+ *  For detailed description of Events, please refer to section I2C_Events in 
+ *  stm32f10x_i2c.h file.
+ *  
+ */
+
+/**
+ * 
+ *  1) Basic state monitoring
+ *******************************************************************************
+ */
+
+/**
+  * @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_SLAVE_TRANSMITTER_ADDRESS_MATCHED           : EV1
+  *     @arg I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED              : EV1
+  *     @arg I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED     : EV1
+  *     @arg I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED        : EV1
+  *     @arg I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED            : EV1
+  *     @arg I2C_EVENT_SLAVE_BYTE_RECEIVED                         : EV2
+  *     @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF)      : EV2
+  *     @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL)    : EV2
+  *     @arg I2C_EVENT_SLAVE_BYTE_TRANSMITTED                      : EV3
+  *     @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF)   : EV3
+  *     @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL) : EV3
+  *     @arg I2C_EVENT_SLAVE_ACK_FAILURE                           : EV3_2
+  *     @arg I2C_EVENT_SLAVE_STOP_DETECTED                         : EV4
+  *     @arg I2C_EVENT_MASTER_MODE_SELECT                          : EV5
+  *     @arg I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED            : EV6     
+  *     @arg I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED               : EV6
+  *     @arg I2C_EVENT_MASTER_BYTE_RECEIVED                        : EV7
+  *     @arg I2C_EVENT_MASTER_BYTE_TRANSMITTING                    : EV8
+  *     @arg I2C_EVENT_MASTER_BYTE_TRANSMITTED                     : EV8_2
+  *     @arg I2C_EVENT_MASTER_MODE_ADDRESS10                       : EV9
+  *     
+  * @note: For detailed description of Events, please refer to section 
+  *    I2C_Events in stm32f10x_i2c.h file.
+  *    
+  * @retval An ErrorStatus enumeration value:
+  * - 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, flag2 = 0;
+  ErrorStatus status = ERROR;
+
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_EVENT(I2C_EVENT));
+
+  /* Read the I2Cx status register */
+  flag1 = I2Cx->SR1;
+  flag2 = I2Cx->SR2;
+  flag2 = flag2 << 16;
+
+  /* Get the last event value from I2C status register */
+  lastevent = (flag1 | flag2) & FLAG_Mask;
+
+  /* Check whether the last event contains the I2C_EVENT */
+  if ((lastevent & I2C_EVENT) == I2C_EVENT)
+  {
+    /* 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;
+}
+
+/**
+ * 
+ *  2) Advanced state monitoring
+ *******************************************************************************
+ */
+
+/**
+  * @brief  Returns the last I2Cx Event.
+  * @param  I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+  *     
+  * @note: For detailed description of Events, please refer to section 
+  *    I2C_Events in stm32f10x_i2c.h file.
+  *    
+  * @retval The last event
+  */
+uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx)
+{
+  uint32_t lastevent = 0;
+  uint32_t flag1 = 0, flag2 = 0;
+
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+
+  /* Read the I2Cx status register */
+  flag1 = I2Cx->SR1;
+  flag2 = I2Cx->SR2;
+  flag2 = flag2 << 16;
+
+  /* Get the last event value from I2C status register */
+  lastevent = (flag1 | flag2) & FLAG_Mask;
+
+  /* Return status */
+  return lastevent;
+}
+
+/**
+ * 
+ *  3) Flag-based state monitoring
+ *******************************************************************************
+ */
+
+/**
+  * @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_DUALF: Dual flag (Slave mode)
+  *     @arg I2C_FLAG_SMBHOST: SMBus host header (Slave mode)
+  *     @arg I2C_FLAG_SMBDEFAULT: SMBus default header (Slave mode)
+  *     @arg I2C_FLAG_GENCALL: General call header flag (Slave mode)
+  *     @arg I2C_FLAG_TRA: Transmitter/Receiver flag
+  *     @arg I2C_FLAG_BUSY: Bus busy flag
+  *     @arg I2C_FLAG_MSL: Master/Slave flag
+  *     @arg I2C_FLAG_SMBALERT: SMBus Alert flag
+  *     @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
+  *     @arg I2C_FLAG_PECERR: PEC error in reception flag
+  *     @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
+  *     @arg I2C_FLAG_AF: Acknowledge failure flag
+  *     @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
+  *     @arg I2C_FLAG_BERR: Bus error flag
+  *     @arg I2C_FLAG_TXE: Data register empty flag (Transmitter)
+  *     @arg I2C_FLAG_RXNE: Data register not empty (Receiver) flag
+  *     @arg I2C_FLAG_STOPF: Stop detection flag (Slave mode)
+  *     @arg I2C_FLAG_ADD10: 10-bit header sent flag (Master mode)
+  *     @arg I2C_FLAG_BTF: Byte transfer finished flag
+  *     @arg I2C_FLAG_ADDR: Address sent flag (Master mode) "ADSL"
+  *   Address matched flag (Slave mode)"ENDA"
+  *     @arg I2C_FLAG_SB: Start bit flag (Master mode)
+  * @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));
+
+  /* Get the I2Cx peripheral base address */
+  i2cxbase = (uint32_t)I2Cx;
+  
+  /* Read flag register index */
+  i2creg = I2C_FLAG >> 28;
+  
+  /* Get bit[23:0] of the flag */
+  I2C_FLAG &= FLAG_Mask;
+  
+  if(i2creg != 0)
+  {
+    /* Get the I2Cx SR1 register address */
+    i2cxbase += 0x14;
+  }
+  else
+  {
+    /* Flag in I2Cx SR2 Register */
+    I2C_FLAG = (uint32_t)(I2C_FLAG >> 16);
+    /* Get the I2Cx SR2 register address */
+    i2cxbase += 0x18;
+  }
+  
+  if(((*(__IO uint32_t *)i2cxbase) & 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_SMBALERT: SMBus Alert flag
+  *     @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
+  *     @arg I2C_FLAG_PECERR: PEC error in reception flag
+  *     @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
+  *     @arg I2C_FLAG_AF: Acknowledge failure flag
+  *     @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
+  *     @arg I2C_FLAG_BERR: Bus error flag
+  *   
+  * @note
+  *   - STOPF (STOP detection) is cleared by software sequence: a read operation 
+  *     to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation 
+  *     to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
+  *   - ADD10 (10-bit header sent) is cleared by software sequence: a read 
+  *     operation to I2C_SR1 (I2C_GetFlagStatus()) followed by writing the 
+  *     second byte of the address in DR register.
+  *   - BTF (Byte Transfer Finished) is cleared by software sequence: a read 
+  *     operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a 
+  *     read/write to I2C_DR register (I2C_SendData()).
+  *   - ADDR (Address sent) is cleared by software sequence: a read operation to 
+  *     I2C_SR1 register (I2C_GetFlagStatus()) followed by a read operation to 
+  *     I2C_SR2 register ((void)(I2Cx->SR2)).
+  *   - SB (Start Bit) is cleared software sequence: a read operation to I2C_SR1
+  *     register (I2C_GetFlagStatus()) followed by a write operation to I2C_DR
+  *     register  (I2C_SendData()).
+  * @retval None
+  */
+void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
+{
+  uint32_t flagpos = 0;
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG));
+  /* Get the I2C flag position */
+  flagpos = I2C_FLAG & FLAG_Mask;
+  /* Clear the selected I2C flag */
+  I2Cx->SR1 = (uint16_t)~flagpos;
+}
+
+/**
+  * @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_SMBALERT: SMBus Alert flag
+  *     @arg I2C_IT_TIMEOUT: Timeout or Tlow error flag
+  *     @arg I2C_IT_PECERR: PEC error in reception flag
+  *     @arg I2C_IT_OVR: Overrun/Underrun flag (Slave mode)
+  *     @arg I2C_IT_AF: Acknowledge failure flag
+  *     @arg I2C_IT_ARLO: Arbitration lost flag (Master mode)
+  *     @arg I2C_IT_BERR: Bus error flag
+  *     @arg I2C_IT_TXE: Data register empty flag (Transmitter)
+  *     @arg I2C_IT_RXNE: Data register not empty (Receiver) flag
+  *     @arg I2C_IT_STOPF: Stop detection flag (Slave mode)
+  *     @arg I2C_IT_ADD10: 10-bit header sent flag (Master mode)
+  *     @arg I2C_IT_BTF: Byte transfer finished flag
+  *     @arg I2C_IT_ADDR: Address sent flag (Master mode) "ADSL"
+  *                       Address matched flag (Slave mode)"ENDAD"
+  *     @arg I2C_IT_SB: Start bit flag (Master mode)
+  * @retval The new state of I2C_IT (SET or RESET).
+  */
+ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
+{
+  ITStatus bitstatus = RESET;
+  uint32_t enablestatus = 0;
+
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_GET_IT(I2C_IT));
+
+  /* Check if the interrupt source is enabled or not */
+  enablestatus = (uint32_t)(((I2C_IT & ITEN_Mask) >> 16) & (I2Cx->CR2)) ;
+  
+  /* Get bit[23:0] of the flag */
+  I2C_IT &= FLAG_Mask;
+
+  /* Check the status of the specified I2C flag */
+  if (((I2Cx->SR1 & I2C_IT) != (uint32_t)RESET) && enablestatus)
+  {
+    /* I2C_IT is set */
+    bitstatus = SET;
+  }
+  else
+  {
+    /* I2C_IT is reset */
+    bitstatus = RESET;
+  }
+  /* Return the I2C_IT status */
+  return  bitstatus;
+}
+
+/**
+  * @brief  Clears the I2Cx’s 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_SMBALERT: SMBus Alert interrupt
+  *     @arg I2C_IT_TIMEOUT: Timeout or Tlow error interrupt
+  *     @arg I2C_IT_PECERR: PEC error in reception  interrupt
+  *     @arg I2C_IT_OVR: Overrun/Underrun interrupt (Slave mode)
+  *     @arg I2C_IT_AF: Acknowledge failure interrupt
+  *     @arg I2C_IT_ARLO: Arbitration lost interrupt (Master mode)
+  *     @arg I2C_IT_BERR: Bus error interrupt
+  *   
+  * @note
+  *   - STOPF (STOP detection) is cleared by software sequence: a read operation 
+  *     to I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to 
+  *     I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
+  *   - ADD10 (10-bit header sent) is cleared by software sequence: a read 
+  *     operation to I2C_SR1 (I2C_GetITStatus()) followed by writing the second 
+  *     byte of the address in I2C_DR register.
+  *   - BTF (Byte Transfer Finished) is cleared by software sequence: a read 
+  *     operation to I2C_SR1 register (I2C_GetITStatus()) followed by a 
+  *     read/write to I2C_DR register (I2C_SendData()).
+  *   - ADDR (Address sent) is cleared by software sequence: a read operation to 
+  *     I2C_SR1 register (I2C_GetITStatus()) followed by a read operation to 
+  *     I2C_SR2 register ((void)(I2Cx->SR2)).
+  *   - SB (Start Bit) is cleared by software sequence: a read operation to 
+  *     I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to 
+  *     I2C_DR register (I2C_SendData()).
+  * @retval None
+  */
+void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
+{
+  uint32_t flagpos = 0;
+  /* Check the parameters */
+  assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+  assert_param(IS_I2C_CLEAR_IT(I2C_IT));
+  /* Get the I2C flag position */
+  flagpos = I2C_IT & FLAG_Mask;
+  /* Clear the selected I2C flag */
+  I2Cx->SR1 = (uint16_t)~flagpos;
+}
+
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */ 
+
+/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/