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