text: /**
    ******************************************************************************
    * @file    stm32l152_eval.c
    * @author  MCD Application Team
    * @version V5.0.2
    * @date    09-March-2012
    * @brief   This file provides:
    *            - set of firmware functions to manage Leds, push-button and COM ports
    *            - low level initialization functions for SD card (on SPI) and
    *              temperature sensor (LM75) available on STM32L152-EVAL 
    *              evaluation board RevB from STMicroelectronics.
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
    *
    * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
    * You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at:
    *
    *        http://www.st.com/software_license_agreement_liberty_v2
    *
    * Unless required by applicable law or agreed to in writing, software 
    * distributed under the License is distributed on an "AS IS" BASIS, 
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    *
    ******************************************************************************
    */
    
  /* Includes ------------------------------------------------------------------*/
  #include "stm32l152_eval.h"
  #include "stm32l1xx_spi.h"
  #include "stm32l1xx_i2c.h"
  
  /** @addtogroup Utilities
    * @{
    */ 
  
  /** @addtogroup STM32_EVAL
    * @{
    */ 
  
  /** @addtogroup STM32L152_EVAL
    * @{
    */   
      
  /** @defgroup STM32L152_EVAL_LOW_LEVEL 
    * @brief This file provides firmware functions to manage Leds, push-buttons, 
    *        COM ports, SD card on SPI and temperature sensor (LM75) available on 
    *        STM32L152-EVAL evaluation board from STMicroelectronics.
    * @{
    */ 
  
  /** @defgroup STM32L152_EVAL_LOW_LEVEL_Private_TypesDefinitions
    * @{
    */ 
  /**
    * @}
    */ 
  
  
  /** @defgroup STM32L152_EVAL_LOW_LEVEL_Private_Defines
    * @{
    */ 
  /**
    * @}
    */ 
  
  
  /** @defgroup STM32L152_EVAL_LOW_LEVEL_Private_Macros
    * @{
    */ 
  /**
    * @}
    */ 
  
  
  /** @defgroup STM32L152_EVAL_LOW_LEVEL_Private_Variables
    * @{
    */ 
  GPIO_TypeDef* GPIO_PORT[LEDn] = {LED1_GPIO_PORT, LED2_GPIO_PORT, LED3_GPIO_PORT,
                                   LED4_GPIO_PORT};
  const uint16_t GPIO_PIN[LEDn] = {LED1_PIN, LED2_PIN, LED3_PIN,
                                   LED4_PIN};
  const uint32_t GPIO_CLK[LEDn] = {LED1_GPIO_CLK, LED2_GPIO_CLK, LED3_GPIO_CLK,
                                   LED4_GPIO_CLK};
  
  GPIO_TypeDef* BUTTON_PORT[BUTTONn] = {KEY_BUTTON_GPIO_PORT, RIGHT_BUTTON_GPIO_PORT,
                                        LEFT_BUTTON_GPIO_PORT, UP_BUTTON_GPIO_PORT,
                                        DOWN_BUTTON_GPIO_PORT, SEL_BUTTON_GPIO_PORT}; 
  
  const uint16_t BUTTON_PIN[BUTTONn] = {KEY_BUTTON_PIN, RIGHT_BUTTON_PIN,
                                        LEFT_BUTTON_PIN, UP_BUTTON_PIN,
                                        DOWN_BUTTON_PIN, SEL_BUTTON_PIN}; 
  
  const uint32_t BUTTON_CLK[BUTTONn] = {KEY_BUTTON_GPIO_CLK, RIGHT_BUTTON_GPIO_CLK,
                                        LEFT_BUTTON_GPIO_CLK, UP_BUTTON_GPIO_CLK,
                                        DOWN_BUTTON_GPIO_CLK, SEL_BUTTON_GPIO_CLK};
  
  const uint16_t BUTTON_EXTI_LINE[BUTTONn] = {KEY_BUTTON_EXTI_LINE,
                                              RIGHT_BUTTON_EXTI_LINE,
                                              LEFT_BUTTON_EXTI_LINE,
                                              UP_BUTTON_EXTI_LINE,
                                              DOWN_BUTTON_EXTI_LINE,
                                              SEL_BUTTON_EXTI_LINE};
  
  const uint8_t BUTTON_PORT_SOURCE[BUTTONn] = {KEY_BUTTON_EXTI_PORT_SOURCE,
                                               RIGHT_BUTTON_EXTI_PORT_SOURCE,
                                               LEFT_BUTTON_EXTI_PORT_SOURCE,
                                               UP_BUTTON_EXTI_PORT_SOURCE,
                                               DOWN_BUTTON_EXTI_PORT_SOURCE,
                                               SEL_BUTTON_EXTI_PORT_SOURCE};
  								 
  const uint8_t BUTTON_PIN_SOURCE[BUTTONn] = {KEY_BUTTON_EXTI_PIN_SOURCE,
                                              RIGHT_BUTTON_EXTI_PIN_SOURCE,
                                              LEFT_BUTTON_EXTI_PIN_SOURCE,
                                              UP_BUTTON_EXTI_PIN_SOURCE,
                                              DOWN_BUTTON_EXTI_PIN_SOURCE,
                                              SEL_BUTTON_EXTI_PIN_SOURCE}; 
                                               
  const uint8_t BUTTON_IRQn[BUTTONn] = {KEY_BUTTON_EXTI_IRQn, RIGHT_BUTTON_EXTI_IRQn,
                                        LEFT_BUTTON_EXTI_IRQn, UP_BUTTON_EXTI_IRQn,
                                        DOWN_BUTTON_EXTI_IRQn, SEL_BUTTON_EXTI_IRQn};
  
  USART_TypeDef* COM_USART[COMn] = {EVAL_COM1, EVAL_COM2}; 
  
  GPIO_TypeDef* COM_TX_PORT[COMn] = {EVAL_COM1_TX_GPIO_PORT, EVAL_COM2_TX_GPIO_PORT};
   
  GPIO_TypeDef* COM_RX_PORT[COMn] = {EVAL_COM1_RX_GPIO_PORT, EVAL_COM2_RX_GPIO_PORT};
  
  const uint32_t COM_USART_CLK[COMn] = {EVAL_COM1_CLK, EVAL_COM2_CLK};
  
  const uint32_t COM_TX_PORT_CLK[COMn] = {EVAL_COM1_TX_GPIO_CLK, EVAL_COM2_TX_GPIO_CLK};
   
  const uint32_t COM_RX_PORT_CLK[COMn] = {EVAL_COM1_RX_GPIO_CLK, EVAL_COM2_RX_GPIO_CLK};
  
  const uint16_t COM_TX_PIN[COMn] = {EVAL_COM1_TX_PIN, EVAL_COM2_TX_PIN};
  
  const uint16_t COM_RX_PIN[COMn] = {EVAL_COM1_RX_PIN, EVAL_COM2_RX_PIN};
   
  const uint8_t COM_TX_PIN_SOURCE[COMn] = {EVAL_COM1_TX_SOURCE, EVAL_COM2_TX_SOURCE};
  
  const uint8_t COM_RX_PIN_SOURCE[COMn] = {EVAL_COM1_RX_SOURCE, EVAL_COM2_RX_SOURCE};
   
  const uint8_t COM_TX_AF[COMn] = {EVAL_COM1_TX_AF, EVAL_COM2_TX_AF};
   
  const uint8_t COM_RX_AF[COMn] = {EVAL_COM1_RX_AF, EVAL_COM2_RX_AF};
  
  DMA_InitTypeDef   sEEDMA_InitStructure;
  
  /**
    * @}
    */ 
  
  
  /** @defgroup STM32L152_EVAL_LOW_LEVEL_Private_FunctionPrototypes
    * @{
    */ 
  
  /**
    * @}
    */ 
  
  /** @defgroup STM32L152_EVAL_LOW_LEVEL_Private_Functions
    * @{
    */ 
  
  /**
    * @brief  Configures LED GPIO.
    * @param  Led: Specifies the Led to be configured. 
    *   This parameter can be one of following parameters:
    *     @arg LED1
    *     @arg LED2
    *     @arg LED3
    *     @arg LED4
    * @retval None
    */
  void STM_EVAL_LEDInit(Led_TypeDef Led)
  {
    GPIO_InitTypeDef  GPIO_InitStructure;
    
    /* Enable the GPIO_LED Clock */
    RCC_AHBPeriphClockCmd(GPIO_CLK[Led], ENABLE);
  
    /* Configure the GPIO_LED pin */
    GPIO_InitStructure.GPIO_Pin = GPIO_PIN[Led];
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
    GPIO_Init(GPIO_PORT[Led], &GPIO_InitStructure);
    GPIO_PORT[Led]->BSRRL = GPIO_PIN[Led];
  }
  
  /**
    * @brief  Turns selected LED On.
    * @param  Led: Specifies the Led to be set on. 
    *   This parameter can be one of following parameters:
    *     @arg LED1
    *     @arg LED2
    *     @arg LED3
    *     @arg LED4  
    * @retval None
    */
  void STM_EVAL_LEDOn(Led_TypeDef Led)
  {
    GPIO_PORT[Led]->BSRRH = GPIO_PIN[Led];
  }
  
  /**
    * @brief  Turns selected LED Off.
    * @param  Led: Specifies the Led to be set off. 
    *   This parameter can be one of following parameters:
    *     @arg LED1
    *     @arg LED2
    *     @arg LED3
    *     @arg LED4 
    * @retval None
    */
  void STM_EVAL_LEDOff(Led_TypeDef Led)
  {
    GPIO_PORT[Led]->BSRRL = GPIO_PIN[Led];  
  }
  
  /**
    * @brief  Toggles the selected LED.
    * @param  Led: Specifies the Led to be toggled. 
    *   This parameter can be one of following parameters:
    *     @arg LED1
    *     @arg LED2
    *     @arg LED3
    *     @arg LED4  
    * @retval None
    */
  void STM_EVAL_LEDToggle(Led_TypeDef Led)
  {
    GPIO_PORT[Led]->ODR ^= GPIO_PIN[Led];
  }
  
  /**
    * @brief  Configures Button GPIO and EXTI Line.
    * @param  Button: Specifies the Button to be configured.
    *   This parameter can be one of following parameters:   
    *     @arg BUTTON_KEY: Key Push Button 
    *     @arg BUTTON_RIGHT: Joystick Right Push Button 
    *     @arg BUTTON_LEFT: Joystick Left Push Button 
    *     @arg BUTTON_UP: Joystick Up Push Button 
    *     @arg BUTTON_DOWN: Joystick Down Push Button
    *     @arg BUTTON_SEL: Joystick Sel Push Button
    * @param  Button_Mode: Specifies Button mode.
    *   This parameter can be one of following parameters:   
    *     @arg BUTTON_MODE_GPIO: Button will be used as simple IO 
    *     @arg BUTTON_MODE_EXTI: Button will be connected to EXTI line with interrupt
    *                     generation capability  
    * @retval None
    */
  void STM_EVAL_PBInit(Button_TypeDef Button, ButtonMode_TypeDef Button_Mode)
  {
    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
  
    /* There is no Wakeup and Tamper buttons on STM32L152-EVAL. */
     
    /* Enable the BUTTON Clock */
    RCC_AHBPeriphClockCmd(BUTTON_CLK[Button], ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  
    /* Configure Button pin as input */
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Pin = BUTTON_PIN[Button];
    GPIO_Init(BUTTON_PORT[Button], &GPIO_InitStructure);
  
    if (Button_Mode == BUTTON_MODE_EXTI)
    {
      /* Connect Button EXTI Line to Button GPIO Pin */
      SYSCFG_EXTILineConfig(BUTTON_PORT_SOURCE[Button], BUTTON_PIN_SOURCE[Button]);
      /* Configure Button EXTI line */
      EXTI_InitStructure.EXTI_Line = BUTTON_EXTI_LINE[Button];
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      
      if(Button != BUTTON_KEY) 
      {
        EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;  
      }
      else
      {
        EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
      }
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStructure);
  
      /* Enable and set Button EXTI Interrupt to the lowest priority */
      NVIC_InitStructure.NVIC_IRQChannel = BUTTON_IRQn[Button];
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  
      NVIC_Init(&NVIC_InitStructure); 
    }
  }
  
  /**
    * @brief  Returns the selected Button state.
    * @param  Button: Specifies the Button to be checked.
    *   This parameter can be one of following parameters:    
    *     @arg BUTTON_KEY: Key Push Button 
    *     @arg BUTTON_RIGHT: Joystick Right Push Button 
    *     @arg BUTTON_LEFT: Joystick Left Push Button 
    *     @arg BUTTON_UP: Joystick Up Push Button 
    *     @arg BUTTON_DOWN: Joystick Down Push Button
    *     @arg BUTTON_SEL: Joystick Sel Push Button    
    * @retval Button GPIO pin value is returned. 
    */
  uint32_t STM_EVAL_PBGetState(Button_TypeDef Button)
  {
    /* There is no Wakeup and Tamper pins on STM32L152-EVAL. */
    
    return GPIO_ReadInputDataBit(BUTTON_PORT[Button], BUTTON_PIN[Button]);
  }
  
  /**
    * @brief  Configures COM port.
    * @param  COM: Specifies the COM port to be configured.
    *   This parameter can be one of following parameters:    
    *     @arg COM1
    *     @arg COM2  
    * @param  USART_InitStruct: pointer to a USART_InitTypeDef structure that
    *   contains the configuration information for the specified USART peripheral.
    * @retval None
    */
  void STM_EVAL_COMInit(COM_TypeDef COM, USART_InitTypeDef* USART_InitStruct)
  {
    GPIO_InitTypeDef GPIO_InitStructure;
  
    /* Enable GPIO clock */
    RCC_AHBPeriphClockCmd(COM_TX_PORT_CLK[COM] | COM_RX_PORT_CLK[COM], ENABLE);
  
    /* Enable UART clock */
    RCC_APB1PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
  
    /* Connect PXx to USARTx_Tx */
    GPIO_PinAFConfig(COM_TX_PORT[COM], COM_TX_PIN_SOURCE[COM], COM_TX_AF[COM]);
  
    /* Connect PXx to USARTx_Rx */
    GPIO_PinAFConfig(COM_RX_PORT[COM], COM_RX_PIN_SOURCE[COM], COM_RX_AF[COM]);
    
    /* Configure USART Tx as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin = COM_TX_PIN[COM];
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(COM_TX_PORT[COM], &GPIO_InitStructure);
      
    /* Configure USART Rx as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin = COM_RX_PIN[COM];
    GPIO_Init(COM_RX_PORT[COM], &GPIO_InitStructure);
  
    /* USART configuration */
    USART_Init(COM_USART[COM], USART_InitStruct);
      
    /* Enable USART */
    USART_Cmd(COM_USART[COM], ENABLE);
  }
  
  /**
    * @brief  DeInitializes the SPI interface.
    * @param  None
    * @retval None
    */
  void SD_LowLevel_DeInit(void)
  {
    GPIO_InitTypeDef  GPIO_InitStructure;
    
    SPI_Cmd(SD_SPI, DISABLE); /*!< SD_SPI disable */
    SPI_DeInit(SD_SPI);   /*!< DeInitializes the SD_SPI */
    
    /*!< SD_SPI Periph clock disable */
    RCC_APB1PeriphClockCmd(SD_SPI_CLK, DISABLE); 
  
    /*!< Configure SD_SPI pins: SCK */
    GPIO_InitStructure.GPIO_Pin = SD_SPI_SCK_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(SD_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure SD_SPI pins: MISO */
    GPIO_InitStructure.GPIO_Pin = SD_SPI_MISO_PIN;
    GPIO_Init(SD_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure SD_SPI pins: MOSI */
    GPIO_InitStructure.GPIO_Pin = SD_SPI_MOSI_PIN;
    GPIO_Init(SD_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure SD_SPI_CS_PIN pin: SD Card CS pin */
    GPIO_InitStructure.GPIO_Pin = SD_CS_PIN;
    GPIO_Init(SD_CS_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure SD_SPI_DETECT_PIN pin: SD Card detect pin */
    GPIO_InitStructure.GPIO_Pin = SD_DETECT_PIN;
    GPIO_Init(SD_DETECT_GPIO_PORT, &GPIO_InitStructure);
  }
  
  /**
    * @brief  Initializes the SD Card and put it into StandBy State (Ready for 
    *         data transfer).
    * @param  None
    * @retval None
    */
  void SD_LowLevel_Init(void)
  {
    GPIO_InitTypeDef  GPIO_InitStructure;
    SPI_InitTypeDef   SPI_InitStructure;
  
    /*!< SD_SPI_CS_GPIO, SD_SPI_MOSI_GPIO, SD_SPI_MISO_GPIO, SD_SPI_DETECT_GPIO 
         and SD_SPI_SCK_GPIO Periph clock enable */
    RCC_AHBPeriphClockCmd(SD_CS_GPIO_CLK | SD_SPI_MOSI_GPIO_CLK | SD_SPI_MISO_GPIO_CLK |
                          SD_SPI_SCK_GPIO_CLK | SD_DETECT_GPIO_CLK, ENABLE);
  
    /*!< SD_SPI Periph clock enable */
    RCC_APB1PeriphClockCmd(SD_SPI_CLK, ENABLE); 
  
    /*!< Configure SD_SPI pins: SCK */
    GPIO_InitStructure.GPIO_Pin = SD_SPI_SCK_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
    GPIO_Init(SD_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure SD_SPI pins: MISO */
    GPIO_InitStructure.GPIO_Pin = SD_SPI_MISO_PIN;
    GPIO_Init(SD_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure SD_SPI pins: MOSI */
    GPIO_InitStructure.GPIO_Pin = SD_SPI_MOSI_PIN;
    GPIO_Init(SD_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure SD_SPI_CS_PIN pin: SD Card CS pin */
    GPIO_InitStructure.GPIO_Pin = SD_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
    GPIO_Init(SD_CS_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure SD_SPI_DETECT_PIN pin: SD Card detect pin */
    GPIO_InitStructure.GPIO_Pin = SD_DETECT_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(SD_DETECT_GPIO_PORT, &GPIO_InitStructure);
  
    /* Connect PXx to SD_SPI_SCK */
    GPIO_PinAFConfig(SD_SPI_SCK_GPIO_PORT, SD_SPI_SCK_SOURCE, SD_SPI_SCK_AF);
  
    /* Connect PXx to SD_SPI_MISO */
    GPIO_PinAFConfig(SD_SPI_MISO_GPIO_PORT, SD_SPI_MISO_SOURCE, SD_SPI_MISO_AF); 
  
    /* Connect PXx to SD_SPI_MOSI */
    GPIO_PinAFConfig(SD_SPI_MOSI_GPIO_PORT, SD_SPI_MOSI_SOURCE, SD_SPI_MOSI_AF);  
    
    /*!< SD_SPI Config */
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
  
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SD_SPI, &SPI_InitStructure);
    
    SPI_Cmd(SD_SPI, ENABLE); /*!< SD_SPI enable */
  }
  
  /**
    * @brief  DeInitializes the LM75_I2C.
    * @param  None
    * @retval None
    */
  void LM75_LowLevel_DeInit(void)
  { 
    GPIO_InitTypeDef  GPIO_InitStructure;
  
    /*!< Disable LM75_I2C */
    I2C_Cmd(LM75_I2C, DISABLE);
    
    /*!< DeInitializes the LM75_I2C */
    I2C_DeInit(LM75_I2C);
    
    /*!< LM75_I2C Periph clock disable */
    RCC_APB1PeriphClockCmd(LM75_I2C_CLK, DISABLE);
      
    /*!< Configure LM75_I2C pins: SCL */
    GPIO_InitStructure.GPIO_Pin = LM75_I2C_SCL_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(LM75_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure LM75_I2C pins: SDA */
    GPIO_InitStructure.GPIO_Pin = LM75_I2C_SDA_PIN;
    GPIO_Init(LM75_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure LM75_I2C pin: SMBUS ALERT */
    GPIO_InitStructure.GPIO_Pin = LM75_I2C_SMBUSALERT_PIN;
    GPIO_Init(LM75_I2C_SMBUSALERT_GPIO_PORT, &GPIO_InitStructure);
  }
  
  /**
    * @brief  Initializes the LM75_I2C.
    * @param  None
    * @retval None
    */
  void LM75_LowLevel_Init(void)
  { 
    GPIO_InitTypeDef  GPIO_InitStructure;
  
    /*!< LM75_I2C Periph clock enable */
    RCC_APB1PeriphClockCmd(LM75_I2C_CLK, ENABLE);
      
    /*!< LM75_I2C_SCL_GPIO_CLK, LM75_I2C_SDA_GPIO_CLK 
         and LM75_I2C_SMBUSALERT_GPIO_CLK Periph clock enable */
    RCC_AHBPeriphClockCmd(LM75_I2C_SCL_GPIO_CLK | LM75_I2C_SDA_GPIO_CLK |
                          LM75_I2C_SMBUSALERT_GPIO_CLK, ENABLE);
  
    /* Connect PXx to I2C_SCL */
    GPIO_PinAFConfig(LM75_I2C_SCL_GPIO_PORT, LM75_I2C_SCL_SOURCE, LM75_I2C_SCL_AF);
  
    /* Connect PXx to I2C_SDA */
    GPIO_PinAFConfig(LM75_I2C_SDA_GPIO_PORT, LM75_I2C_SDA_SOURCE, LM75_I2C_SDA_AF); 
  
    /* Connect PXx to I2C_SMBUSALER */
    GPIO_PinAFConfig(LM75_I2C_SMBUSALERT_GPIO_PORT, LM75_I2C_SMBUSALERT_SOURCE, LM75_I2C_SMBUSALERT_AF);   
     
    /*!< Configure LM75_I2C pins: SCL */
    GPIO_InitStructure.GPIO_Pin = LM75_I2C_SCL_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
    GPIO_Init(LM75_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure LM75_I2C pins: SDA */
    GPIO_InitStructure.GPIO_Pin = LM75_I2C_SDA_PIN;
    GPIO_Init(LM75_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure LM75_I2C pin: SMBUS ALERT */
    GPIO_InitStructure.GPIO_Pin = LM75_I2C_SMBUSALERT_PIN;
    GPIO_Init(LM75_I2C_SMBUSALERT_GPIO_PORT, &GPIO_InitStructure);
  }
  
  /**
    * @brief  DeInitializes peripherals used by the I2C EEPROM driver.
    * @param  None
    * @retval None
    */
  void sEE_LowLevel_DeInit(void)
  {
    GPIO_InitTypeDef  GPIO_InitStructure; 
    NVIC_InitTypeDef NVIC_InitStructure;    
       
    /* sEE_I2C Peripheral Disable */
    I2C_Cmd(sEE_I2C, DISABLE);
   
    /* sEE_I2C DeInit */
    I2C_DeInit(sEE_I2C);
  
    /*!< sEE_I2C Periph clock disable */
    RCC_APB1PeriphClockCmd(sEE_I2C_CLK, DISABLE);
      
    /*!< GPIO configuration */  
    /*!< Configure sEE_I2C pins: SCL */
    GPIO_InitStructure.GPIO_Pin = sEE_I2C_SCL_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(sEE_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure sEE_I2C pins: SDA */
    GPIO_InitStructure.GPIO_Pin = sEE_I2C_SDA_PIN;
    GPIO_Init(sEE_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
    
    /* Configure and enable I2C DMA TX Channel interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = sEE_I2C_DMA_TX_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = sEE_I2C_DMA_PREPRIO;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = sEE_I2C_DMA_SUBPRIO;
    NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
    NVIC_Init(&NVIC_InitStructure);
  
    /* Configure and enable I2C DMA RX Channel interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = sEE_I2C_DMA_RX_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = sEE_I2C_DMA_PREPRIO;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = sEE_I2C_DMA_SUBPRIO;
    NVIC_Init(&NVIC_InitStructure);   
    
    /* Disable and Deinitialize the DMA channels */
    DMA_Cmd(sEE_I2C_DMA_CHANNEL_TX, DISABLE);
    DMA_Cmd(sEE_I2C_DMA_CHANNEL_RX, DISABLE);
    DMA_DeInit(sEE_I2C_DMA_CHANNEL_TX);
    DMA_DeInit(sEE_I2C_DMA_CHANNEL_RX);
  }
  
  /**
    * @brief  Initializes peripherals used by the I2C EEPROM driver.
    * @param  None
    * @retval None
    */
  void sEE_LowLevel_Init(void)
  {
    GPIO_InitTypeDef  GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;  
     
    /*!< sEE_I2C Periph clock enable */
    RCC_APB1PeriphClockCmd(sEE_I2C_CLK, ENABLE);
    
    /*!< sEE_I2C_SCL_GPIO_CLK and sEE_I2C_SDA_GPIO_CLK Periph clock enable */
    RCC_AHBPeriphClockCmd(sEE_I2C_SCL_GPIO_CLK | sEE_I2C_SDA_GPIO_CLK, ENABLE);
  
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
    
    /* Reset sEE_I2C peripheral */
    RCC_APB1PeriphResetCmd(sEE_I2C_CLK, ENABLE);
    
    /* Release reset signal of sEE_I2C IP */
    RCC_APB1PeriphResetCmd(sEE_I2C_CLK, DISABLE);
      
    /*!< GPIO configuration */  
    /* Connect PXx to I2C_SCL*/
    GPIO_PinAFConfig(sEE_I2C_SCL_GPIO_PORT, sEE_I2C_SCL_SOURCE, sEE_I2C_SCL_AF);
  
    /* Connect PXx to I2C_SDA*/
    GPIO_PinAFConfig(sEE_I2C_SDA_GPIO_PORT, sEE_I2C_SDA_SOURCE, sEE_I2C_SDA_AF);  
  
    /*!< Configure sEE_I2C pins: SCL */   
    GPIO_InitStructure.GPIO_Pin = sEE_I2C_SCL_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
    GPIO_Init(sEE_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
  
    /*!< Configure sEE_I2C pins: SDA */
    GPIO_InitStructure.GPIO_Pin = sEE_I2C_SDA_PIN;
    GPIO_Init(sEE_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
  
  
    /* Configure and enable I2C DMA TX Channel interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = sEE_I2C_DMA_TX_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = sEE_I2C_DMA_PREPRIO;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = sEE_I2C_DMA_SUBPRIO;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
  
    /* Configure and enable I2C DMA RX Channel interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = sEE_I2C_DMA_RX_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = sEE_I2C_DMA_PREPRIO;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = sEE_I2C_DMA_SUBPRIO;
    NVIC_Init(&NVIC_InitStructure);  
    
    /*!< I2C DMA TX and RX channels configuration */
    /* Enable the DMA clock */
    RCC_AHBPeriphClockCmd(sEE_I2C_DMA_CLK, ENABLE);
  
    /* I2C TX DMA Channel configuration */
    DMA_DeInit(sEE_I2C_DMA_CHANNEL_TX);
    sEEDMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)sEE_I2C_DR_Address;
    sEEDMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)0;   /* This parameter will be configured durig communication */
    sEEDMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;    /* This parameter will be configured durig communication */
    sEEDMA_InitStructure.DMA_BufferSize = 0xFFFF;            /* This parameter will be configured durig communication */
    sEEDMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    sEEDMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    sEEDMA_InitStructure.DMA_PeripheralDataSize = DMA_MemoryDataSize_Byte;
    sEEDMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    sEEDMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    sEEDMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
    sEEDMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(sEE_I2C_DMA_CHANNEL_TX, &sEEDMA_InitStructure);  
    
    /* I2C RX DMA Channel configuration */
    DMA_DeInit(sEE_I2C_DMA_CHANNEL_RX);
    DMA_Init(sEE_I2C_DMA_CHANNEL_RX, &sEEDMA_InitStructure);  
    
    /* Enable the DMA Channels Interrupts */
    DMA_ITConfig(sEE_I2C_DMA_CHANNEL_TX, DMA_IT_TC, ENABLE);
    DMA_ITConfig(sEE_I2C_DMA_CHANNEL_RX, DMA_IT_TC, ENABLE);    
  }
  
  /**
    * @brief  Initializes DMA channel used by the I2C EEPROM driver.
    * @param  None
    * @retval None
    */
  void sEE_LowLevel_DMAConfig(uint32_t pBuffer, uint32_t BufferSize, uint32_t Direction)
  { 
    /* Initialize the DMA with the new parameters */
    if (Direction == sEE_DIRECTION_TX)
    {
      /* Configure the DMA Tx Channel with the buffer address and the buffer size */
      sEEDMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)pBuffer;
      sEEDMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;    
      sEEDMA_InitStructure.DMA_BufferSize = (uint32_t)BufferSize;  
      DMA_Init(sEE_I2C_DMA_CHANNEL_TX, &sEEDMA_InitStructure);  
    }
    else
    { 
      /* Configure the DMA Rx Channel with the buffer address and the buffer size */
      sEEDMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)pBuffer;
      sEEDMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
      sEEDMA_InitStructure.DMA_BufferSize = (uint32_t)BufferSize;      
      DMA_Init(sEE_I2C_DMA_CHANNEL_RX, &sEEDMA_InitStructure);    
    }
  }
  
  /**
    * @}
    */ 
  
  
  /**
    * @}
    */ 
  
  /**
    * @}
    */
  
  /**
    * @}
    */    
  
  /**
    * @}
    */ 
      
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  