| /** |
| ****************************************************************************** |
| * @file stm32f4xx_hal_i2c_ex.c |
| * @author MCD Application Team |
| * @brief I2C Extension HAL module driver. |
| * This file provides firmware functions to manage the following |
| * functionalities of I2C extension peripheral: |
| * + Extension features functions |
| * |
| ****************************************************************************** |
| * @attention |
| * |
| * Copyright (c) 2016 STMicroelectronics. |
| * All rights reserved. |
| * |
| * This software is licensed under terms that can be found in the LICENSE file |
| * in the root directory of this software component. |
| * If no LICENSE file comes with this software, it is provided AS-IS. |
| * |
| ****************************************************************************** |
| @verbatim |
| ============================================================================== |
| ##### I2C peripheral extension features ##### |
| ============================================================================== |
| |
| [..] Comparing to other previous devices, the I2C interface for STM32F427xx/437xx/ |
| 429xx/439xx devices contains the following additional features : |
| |
| (+) Possibility to disable or enable Analog Noise Filter |
| (+) Use of a configured Digital Noise Filter |
| |
| ##### How to use this driver ##### |
| ============================================================================== |
| [..] This driver provides functions to configure Noise Filter |
| (#) Configure I2C Analog noise filter using the function HAL_I2C_AnalogFilter_Config() |
| (#) Configure I2C Digital noise filter using the function HAL_I2C_DigitalFilter_Config() |
| |
| @endverbatim |
| */ |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "stm32f4xx_hal.h" |
| |
| /** @addtogroup STM32F4xx_HAL_Driver |
| * @{ |
| */ |
| |
| /** @defgroup I2CEx I2CEx |
| * @brief I2C HAL module driver |
| * @{ |
| */ |
| |
| #ifdef HAL_I2C_MODULE_ENABLED |
| |
| #if defined(I2C_FLTR_ANOFF)&&defined(I2C_FLTR_DNF) |
| /* Private typedef -----------------------------------------------------------*/ |
| /* Private define ------------------------------------------------------------*/ |
| /* Private macro -------------------------------------------------------------*/ |
| /* Private variables ---------------------------------------------------------*/ |
| /* Private function prototypes -----------------------------------------------*/ |
| /* Exported functions --------------------------------------------------------*/ |
| /** @defgroup I2CEx_Exported_Functions I2C Exported Functions |
| * @{ |
| */ |
| |
| |
| /** @defgroup I2CEx_Exported_Functions_Group1 Extension features functions |
| * @brief Extension features functions |
| * |
| @verbatim |
| =============================================================================== |
| ##### Extension features functions ##### |
| =============================================================================== |
| [..] This section provides functions allowing to: |
| (+) Configure Noise Filters |
| |
| @endverbatim |
| * @{ |
| */ |
| |
| /** |
| * @brief Configures I2C Analog noise filter. |
| * @param hi2c pointer to a I2C_HandleTypeDef structure that contains |
| * the configuration information for the specified I2Cx peripheral. |
| * @param AnalogFilter new state of the Analog filter. |
| * @retval HAL status |
| */ |
| HAL_StatusTypeDef HAL_I2CEx_ConfigAnalogFilter(I2C_HandleTypeDef *hi2c, uint32_t AnalogFilter) |
| { |
| /* Check the parameters */ |
| assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance)); |
| assert_param(IS_I2C_ANALOG_FILTER(AnalogFilter)); |
| |
| if (hi2c->State == HAL_I2C_STATE_READY) |
| { |
| hi2c->State = HAL_I2C_STATE_BUSY; |
| |
| /* Disable the selected I2C peripheral */ |
| __HAL_I2C_DISABLE(hi2c); |
| |
| /* Reset I2Cx ANOFF bit */ |
| hi2c->Instance->FLTR &= ~(I2C_FLTR_ANOFF); |
| |
| /* Disable the analog filter */ |
| hi2c->Instance->FLTR |= AnalogFilter; |
| |
| __HAL_I2C_ENABLE(hi2c); |
| |
| hi2c->State = HAL_I2C_STATE_READY; |
| |
| return HAL_OK; |
| } |
| else |
| { |
| return HAL_BUSY; |
| } |
| } |
| |
| /** |
| * @brief Configures I2C Digital noise filter. |
| * @param hi2c pointer to a I2C_HandleTypeDef structure that contains |
| * the configuration information for the specified I2Cx peripheral. |
| * @param DigitalFilter Coefficient of digital noise filter between 0x00 and 0x0F. |
| * @retval HAL status |
| */ |
| HAL_StatusTypeDef HAL_I2CEx_ConfigDigitalFilter(I2C_HandleTypeDef *hi2c, uint32_t DigitalFilter) |
| { |
| uint16_t tmpreg = 0; |
| |
| /* Check the parameters */ |
| assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance)); |
| assert_param(IS_I2C_DIGITAL_FILTER(DigitalFilter)); |
| |
| if (hi2c->State == HAL_I2C_STATE_READY) |
| { |
| hi2c->State = HAL_I2C_STATE_BUSY; |
| |
| /* Disable the selected I2C peripheral */ |
| __HAL_I2C_DISABLE(hi2c); |
| |
| /* Get the old register value */ |
| tmpreg = hi2c->Instance->FLTR; |
| |
| /* Reset I2Cx DNF bit [3:0] */ |
| tmpreg &= ~(I2C_FLTR_DNF); |
| |
| /* Set I2Cx DNF coefficient */ |
| tmpreg |= DigitalFilter; |
| |
| /* Store the new register value */ |
| hi2c->Instance->FLTR = tmpreg; |
| |
| __HAL_I2C_ENABLE(hi2c); |
| |
| hi2c->State = HAL_I2C_STATE_READY; |
| |
| return HAL_OK; |
| } |
| else |
| { |
| return HAL_BUSY; |
| } |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| #endif |
| |
| #endif /* HAL_I2C_MODULE_ENABLED */ |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |