1 | /**
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2 | ******************************************************************************
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3 | * @file stm32f4xx_hal_i2c_ex.c
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4 | * @author MCD Application Team
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5 | * @version V1.4.1
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6 | * @date 09-October-2015
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7 | * @brief I2C Extension HAL module driver.
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8 | * This file provides firmware functions to manage the following
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9 | * functionalities of I2C extension peripheral:
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10 | * + Extension features functions
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11 | *
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12 | @verbatim
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13 | ==============================================================================
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14 | ##### I2C peripheral extension features #####
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15 | ==============================================================================
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16 |
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17 | [..] Comparing to other previous devices, the I2C interface for STM32F427xx/437xx/
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18 | 429xx/439xx devices contains the following additional features :
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19 |
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20 | (+) Possibility to disable or enable Analog Noise Filter
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21 | (+) Use of a configured Digital Noise Filter
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22 |
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23 | ##### How to use this driver #####
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24 | ==============================================================================
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25 | [..] This driver provides functions to configure Noise Filter
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26 | (#) Configure I2C Analog noise filter using the function HAL_I2C_AnalogFilter_Config()
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27 | (#) Configure I2C Digital noise filter using the function HAL_I2C_DigitalFilter_Config()
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28 |
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29 | @endverbatim
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30 | ******************************************************************************
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31 | * @attention
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32 | *
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33 | * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
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34 | *
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35 | * Redistribution and use in source and binary forms, with or without modification,
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36 | * are permitted provided that the following conditions are met:
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37 | * 1. Redistributions of source code must retain the above copyright notice,
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38 | * this list of conditions and the following disclaimer.
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39 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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40 | * this list of conditions and the following disclaimer in the documentation
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41 | * and/or other materials provided with the distribution.
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42 | * 3. Neither the name of STMicroelectronics nor the names of its contributors
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43 | * may be used to endorse or promote products derived from this software
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44 | * without specific prior written permission.
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45 | *
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46 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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47 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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48 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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49 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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50 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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51 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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52 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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53 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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54 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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55 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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56 | *
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57 | ******************************************************************************
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58 | */
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59 |
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60 | /* Includes ------------------------------------------------------------------*/
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61 | #include "stm32f4xx_hal.h"
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62 |
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63 | /** @addtogroup STM32F4xx_HAL_Driver
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64 | * @{
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65 | */
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66 |
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67 | /** @defgroup I2CEx I2CEx
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68 | * @brief I2C HAL module driver
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69 | * @{
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70 | */
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71 |
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72 | #ifdef HAL_I2C_MODULE_ENABLED
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73 |
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74 | #if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx) ||\
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75 | defined(STM32F401xC) || defined(STM32F401xE) || defined(STM32F411xE) || defined(STM32F446xx) ||\
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76 | defined(STM32F469xx) || defined(STM32F479xx)
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77 | /* Private typedef -----------------------------------------------------------*/
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78 | /* Private define ------------------------------------------------------------*/
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79 | /* Private macro -------------------------------------------------------------*/
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80 | /* Private variables ---------------------------------------------------------*/
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81 | /* Private function prototypes -----------------------------------------------*/
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82 | /* Exported functions --------------------------------------------------------*/
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83 | /** @defgroup I2CEx_Exported_Functions I2C Exported Functions
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84 | * @{
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85 | */
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86 |
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87 |
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88 | /** @defgroup I2CEx_Exported_Functions_Group1 Extension features functions
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89 | * @brief Extension features functions
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90 | *
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91 | @verbatim
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92 | ===============================================================================
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93 | ##### Extension features functions #####
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94 | ===============================================================================
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95 | [..] This section provides functions allowing to:
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96 | (+) Configure Noise Filters
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97 |
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98 | @endverbatim
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99 | * @{
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100 | */
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101 |
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102 | /**
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103 | * @brief Configures I2C Analog noise filter.
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104 | * @param hi2c: pointer to a I2C_HandleTypeDef structure that contains
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105 | * the configuration information for the specified I2Cx peripheral.
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106 | * @param AnalogFilter: new state of the Analog filter.
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107 | * @retval HAL status
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108 | */
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109 | HAL_StatusTypeDef HAL_I2CEx_ConfigAnalogFilter(I2C_HandleTypeDef *hi2c, uint32_t AnalogFilter)
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110 | {
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111 | uint32_t tmp = 0;
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112 |
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113 | /* Check the parameters */
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114 | assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));
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115 | assert_param(IS_I2C_ANALOG_FILTER(AnalogFilter));
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116 |
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117 | tmp = hi2c->State;
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118 | if((tmp == HAL_I2C_STATE_BUSY) || (tmp == HAL_I2C_STATE_BUSY_TX) || (tmp == HAL_I2C_STATE_BUSY_RX))
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119 | {
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120 | return HAL_BUSY;
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121 | }
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122 |
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123 | hi2c->State = HAL_I2C_STATE_BUSY;
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124 |
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125 | /* Disable the selected I2C peripheral */
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126 | __HAL_I2C_DISABLE(hi2c);
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127 |
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128 | /* Reset I2Cx ANOFF bit */
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129 | hi2c->Instance->FLTR &= ~(I2C_FLTR_ANOFF);
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130 |
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131 | /* Disable the analog filter */
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132 | hi2c->Instance->FLTR |= AnalogFilter;
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133 |
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134 | __HAL_I2C_ENABLE(hi2c);
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135 |
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136 | hi2c->State = HAL_I2C_STATE_READY;
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137 |
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138 | return HAL_OK;
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139 | }
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140 |
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141 | /**
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142 | * @brief Configures I2C Digital noise filter.
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143 | * @param hi2c: pointer to a I2C_HandleTypeDef structure that contains
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144 | * the configuration information for the specified I2Cx peripheral.
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145 | * @param DigitalFilter: Coefficient of digital noise filter between 0x00 and 0x0F.
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146 | * @retval HAL status
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147 | */
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148 | HAL_StatusTypeDef HAL_I2CEx_ConfigDigitalFilter(I2C_HandleTypeDef *hi2c, uint32_t DigitalFilter)
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149 | {
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150 | uint16_t tmpreg = 0;
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151 | uint32_t tmp = 0;
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152 |
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153 | /* Check the parameters */
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154 | assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));
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155 | assert_param(IS_I2C_DIGITAL_FILTER(DigitalFilter));
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156 |
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157 | tmp = hi2c->State;
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158 | if((tmp == HAL_I2C_STATE_BUSY) || (tmp == HAL_I2C_STATE_BUSY_TX) || (tmp == HAL_I2C_STATE_BUSY_RX))
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159 | {
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160 | return HAL_BUSY;
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161 | }
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162 |
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163 | hi2c->State = HAL_I2C_STATE_BUSY;
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164 |
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165 | /* Disable the selected I2C peripheral */
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166 | __HAL_I2C_DISABLE(hi2c);
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167 |
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168 | /* Get the old register value */
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169 | tmpreg = hi2c->Instance->FLTR;
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170 |
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171 | /* Reset I2Cx DNF bit [3:0] */
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172 | tmpreg &= ~(I2C_FLTR_DNF);
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173 |
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174 | /* Set I2Cx DNF coefficient */
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175 | tmpreg |= DigitalFilter;
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176 |
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177 | /* Store the new register value */
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178 | hi2c->Instance->FLTR = tmpreg;
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179 |
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180 | __HAL_I2C_ENABLE(hi2c);
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181 |
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182 | hi2c->State = HAL_I2C_STATE_READY;
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183 |
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184 | return HAL_OK;
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185 | }
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186 |
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187 | /**
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188 | * @}
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189 | */
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190 |
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191 | /**
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192 | * @}
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193 | */
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194 | #endif /* STM32F427xx || STM32F429xx || STM32F437xx || STM32F439xx || STM32F401xC ||\
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195 | STM32F401xE || STM32F446xx || STM32F469xx || STM32F479xx */
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196 |
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197 | #endif /* HAL_I2C_MODULE_ENABLED */
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198 | /**
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199 | * @}
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200 | */
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201 |
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202 | /**
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203 | * @}
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204 | */
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205 |
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206 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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