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/**
******************************************************************************
* @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 */
/**
* @}
*/
/**
* @}
*/
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