Mercurial > public > ostc4
annotate Common/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rng.c @ 504:8428195a4967
Added worst case plausibility check (disabled by compile switch)
Just used in case of development activities which may cause negativ values resulting in errors / timeout in the deco calculation
author | Ideenmodellierer |
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date | Mon, 24 Aug 2020 19:59:28 +0200 |
parents | c78bcbd5deda |
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rev | line source |
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128
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1 /** |
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2 ****************************************************************************** |
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3 * @file stm32f4xx_hal_rng.c |
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4 * @author MCD Application Team |
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5 * @brief RNG HAL module driver. |
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6 * This file provides firmware functions to manage the following |
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7 * functionalities of the Random Number Generator (RNG) peripheral: |
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8 * + Initialization/de-initialization functions |
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9 * + Peripheral Control functions |
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10 * + Peripheral State functions |
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11 * |
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12 @verbatim |
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13 ============================================================================== |
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14 ##### How to use this driver ##### |
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15 ============================================================================== |
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16 [..] |
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17 The RNG HAL driver can be used as follows: |
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18 |
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19 (#) Enable the RNG controller clock using __HAL_RCC_RNG_CLK_ENABLE() macro |
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20 in HAL_RNG_MspInit(). |
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21 (#) Activate the RNG peripheral using HAL_RNG_Init() function. |
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22 (#) Wait until the 32 bit Random Number Generator contains a valid |
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23 random data using (polling/interrupt) mode. |
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24 (#) Get the 32 bit random number using HAL_RNG_GenerateRandomNumber() function. |
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25 |
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26 @endverbatim |
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27 ****************************************************************************** |
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28 * @attention |
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29 * |
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30 * <h2><center>© COPYRIGHT(c) 2017 STMicroelectronics</center></h2> |
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31 * |
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32 * Redistribution and use in source and binary forms, with or without modification, |
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33 * are permitted provided that the following conditions are met: |
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34 * 1. Redistributions of source code must retain the above copyright notice, |
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35 * this list of conditions and the following disclaimer. |
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36 * 2. Redistributions in binary form must reproduce the above copyright notice, |
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37 * this list of conditions and the following disclaimer in the documentation |
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38 * and/or other materials provided with the distribution. |
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39 * 3. Neither the name of STMicroelectronics nor the names of its contributors |
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40 * may be used to endorse or promote products derived from this software |
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41 * without specific prior written permission. |
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42 * |
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43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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44 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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46 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
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47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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49 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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50 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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51 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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52 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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53 * |
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54 ****************************************************************************** |
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55 */ |
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56 |
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57 /* Includes ------------------------------------------------------------------*/ |
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58 #include "stm32f4xx_hal.h" |
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59 |
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60 /** @addtogroup STM32F4xx_HAL_Driver |
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61 * @{ |
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62 */ |
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63 |
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64 /** @addtogroup RNG |
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65 * @{ |
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66 */ |
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67 |
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68 #ifdef HAL_RNG_MODULE_ENABLED |
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69 |
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70 #if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx) ||\ |
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71 defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx) ||\ |
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72 defined(STM32F410Tx) || defined(STM32F410Cx) || defined(STM32F410Rx) || defined(STM32F469xx) ||\ |
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73 defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx) || defined(STM32F412Rx) ||\ |
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74 defined(STM32F412Cx) || defined(STM32F413xx) || defined(STM32F423xx) |
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75 |
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76 |
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77 /* Private types -------------------------------------------------------------*/ |
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78 /* Private defines -----------------------------------------------------------*/ |
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79 /* Private variables ---------------------------------------------------------*/ |
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80 /* Private constants ---------------------------------------------------------*/ |
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81 /** @addtogroup RNG_Private_Constants |
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82 * @{ |
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83 */ |
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84 #define RNG_TIMEOUT_VALUE 2U |
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85 /** |
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86 * @} |
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87 */ |
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88 /* Private macros ------------------------------------------------------------*/ |
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89 /* Private functions prototypes ----------------------------------------------*/ |
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90 /* Private functions ---------------------------------------------------------*/ |
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91 /* Exported functions --------------------------------------------------------*/ |
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92 |
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93 /** @addtogroup RNG_Exported_Functions |
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94 * @{ |
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95 */ |
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96 |
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97 /** @addtogroup RNG_Exported_Functions_Group1 |
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98 * @brief Initialization and de-initialization functions |
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99 * |
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100 @verbatim |
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101 =============================================================================== |
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102 ##### Initialization and de-initialization functions ##### |
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103 =============================================================================== |
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104 [..] This section provides functions allowing to: |
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105 (+) Initialize the RNG according to the specified parameters |
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106 in the RNG_InitTypeDef and create the associated handle |
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107 (+) DeInitialize the RNG peripheral |
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108 (+) Initialize the RNG MSP |
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109 (+) DeInitialize RNG MSP |
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110 |
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111 @endverbatim |
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112 * @{ |
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113 */ |
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114 |
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115 /** |
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116 * @brief Initializes the RNG peripheral and creates the associated handle. |
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117 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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118 * the configuration information for RNG. |
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119 * @retval HAL status |
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120 */ |
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121 HAL_StatusTypeDef HAL_RNG_Init(RNG_HandleTypeDef *hrng) |
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122 { |
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123 /* Check the RNG handle allocation */ |
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124 if(hrng == NULL) |
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125 { |
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126 return HAL_ERROR; |
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127 } |
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128 |
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129 if(hrng->State == HAL_RNG_STATE_RESET) |
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130 { |
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131 /* Allocate lock resource and initialize it */ |
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132 hrng->Lock = HAL_UNLOCKED; |
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133 /* Init the low level hardware */ |
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134 HAL_RNG_MspInit(hrng); |
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135 } |
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136 |
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137 /* Change RNG peripheral state */ |
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138 hrng->State = HAL_RNG_STATE_BUSY; |
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139 |
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140 /* Enable the RNG Peripheral */ |
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141 __HAL_RNG_ENABLE(hrng); |
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142 |
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143 /* Initialize the RNG state */ |
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144 hrng->State = HAL_RNG_STATE_READY; |
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145 |
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146 /* Return function status */ |
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147 return HAL_OK; |
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148 } |
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149 |
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150 /** |
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151 * @brief DeInitializes the RNG peripheral. |
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152 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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153 * the configuration information for RNG. |
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154 * @retval HAL status |
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155 */ |
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156 HAL_StatusTypeDef HAL_RNG_DeInit(RNG_HandleTypeDef *hrng) |
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157 { |
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158 /* Check the RNG handle allocation */ |
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159 if(hrng == NULL) |
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160 { |
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161 return HAL_ERROR; |
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162 } |
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163 /* Disable the RNG Peripheral */ |
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164 CLEAR_BIT(hrng->Instance->CR, RNG_CR_IE | RNG_CR_RNGEN); |
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165 |
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166 /* Clear RNG interrupt status flags */ |
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167 CLEAR_BIT(hrng->Instance->SR, RNG_SR_CEIS | RNG_SR_SEIS); |
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168 |
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169 /* DeInit the low level hardware */ |
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170 HAL_RNG_MspDeInit(hrng); |
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171 |
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172 /* Update the RNG state */ |
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173 hrng->State = HAL_RNG_STATE_RESET; |
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174 |
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175 /* Release Lock */ |
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176 __HAL_UNLOCK(hrng); |
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177 |
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178 /* Return the function status */ |
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179 return HAL_OK; |
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180 } |
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181 |
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182 /** |
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183 * @brief Initializes the RNG MSP. |
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184 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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185 * the configuration information for RNG. |
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186 * @retval None |
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187 */ |
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188 __weak void HAL_RNG_MspInit(RNG_HandleTypeDef *hrng) |
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189 { |
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190 /* Prevent unused argument(s) compilation warning */ |
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191 UNUSED(hrng); |
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192 /* NOTE : This function should not be modified. When the callback is needed, |
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193 function HAL_RNG_MspInit must be implemented in the user file. |
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194 */ |
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195 } |
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196 |
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197 /** |
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198 * @brief DeInitializes the RNG MSP. |
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199 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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200 * the configuration information for RNG. |
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201 * @retval None |
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202 */ |
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203 __weak void HAL_RNG_MspDeInit(RNG_HandleTypeDef *hrng) |
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204 { |
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205 /* Prevent unused argument(s) compilation warning */ |
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206 UNUSED(hrng); |
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207 /* NOTE : This function should not be modified. When the callback is needed, |
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208 function HAL_RNG_MspDeInit must be implemented in the user file. |
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209 */ |
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210 } |
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211 |
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212 /** |
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213 * @} |
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214 */ |
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215 |
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216 /** @addtogroup RNG_Exported_Functions_Group2 |
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217 * @brief Peripheral Control functions |
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218 * |
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219 @verbatim |
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220 =============================================================================== |
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221 ##### Peripheral Control functions ##### |
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222 =============================================================================== |
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223 [..] This section provides functions allowing to: |
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224 (+) Get the 32 bit Random number |
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225 (+) Get the 32 bit Random number with interrupt enabled |
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226 (+) Handle RNG interrupt request |
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227 |
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228 @endverbatim |
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229 * @{ |
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230 */ |
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231 |
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232 /** |
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233 * @brief Generates a 32-bit random number. |
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234 * @note Each time the random number data is read the RNG_FLAG_DRDY flag |
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235 * is automatically cleared. |
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236 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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237 * the configuration information for RNG. |
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238 * @param random32bit pointer to generated random number variable if successful. |
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239 * @retval HAL status |
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240 */ |
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241 |
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242 HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber(RNG_HandleTypeDef *hrng, uint32_t *random32bit) |
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243 { |
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244 uint32_t tickstart = 0U; |
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245 HAL_StatusTypeDef status = HAL_OK; |
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246 |
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247 /* Process Locked */ |
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248 __HAL_LOCK(hrng); |
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249 |
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250 /* Check RNG peripheral state */ |
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251 if(hrng->State == HAL_RNG_STATE_READY) |
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252 { |
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253 /* Change RNG peripheral state */ |
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254 hrng->State = HAL_RNG_STATE_BUSY; |
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255 |
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256 /* Get tick */ |
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257 tickstart = HAL_GetTick(); |
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258 |
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259 /* Check if data register contains valid random data */ |
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260 while(__HAL_RNG_GET_FLAG(hrng, RNG_FLAG_DRDY) == RESET) |
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261 { |
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262 if((HAL_GetTick() - tickstart ) > RNG_TIMEOUT_VALUE) |
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263 { |
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264 hrng->State = HAL_RNG_STATE_ERROR; |
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265 |
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266 /* Process Unlocked */ |
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267 __HAL_UNLOCK(hrng); |
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268 |
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269 return HAL_TIMEOUT; |
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270 } |
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271 } |
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272 |
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273 /* Get a 32bit Random number */ |
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274 hrng->RandomNumber = hrng->Instance->DR; |
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275 *random32bit = hrng->RandomNumber; |
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276 |
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277 hrng->State = HAL_RNG_STATE_READY; |
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278 } |
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279 else |
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280 { |
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281 status = HAL_ERROR; |
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282 } |
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283 |
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284 /* Process Unlocked */ |
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285 __HAL_UNLOCK(hrng); |
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286 |
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287 return status; |
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288 } |
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289 |
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290 /** |
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291 * @brief Generates a 32-bit random number in interrupt mode. |
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292 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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293 * the configuration information for RNG. |
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294 * @retval HAL status |
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295 */ |
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296 HAL_StatusTypeDef HAL_RNG_GenerateRandomNumber_IT(RNG_HandleTypeDef *hrng) |
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297 { |
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298 HAL_StatusTypeDef status = HAL_OK; |
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299 |
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300 /* Process Locked */ |
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301 __HAL_LOCK(hrng); |
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302 |
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303 /* Check RNG peripheral state */ |
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304 if(hrng->State == HAL_RNG_STATE_READY) |
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305 { |
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306 /* Change RNG peripheral state */ |
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307 hrng->State = HAL_RNG_STATE_BUSY; |
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308 |
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309 /* Process Unlocked */ |
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310 __HAL_UNLOCK(hrng); |
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311 |
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312 /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */ |
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313 __HAL_RNG_ENABLE_IT(hrng); |
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314 } |
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315 else |
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316 { |
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317 /* Process Unlocked */ |
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318 __HAL_UNLOCK(hrng); |
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319 |
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320 status = HAL_ERROR; |
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321 } |
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322 |
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323 return status; |
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324 } |
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325 |
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326 /** |
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327 * @brief Handles RNG interrupt request. |
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328 * @note In the case of a clock error, the RNG is no more able to generate |
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329 * random numbers because the PLL48CLK clock is not correct. User has |
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330 * to check that the clock controller is correctly configured to provide |
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331 * the RNG clock and clear the CEIS bit using __HAL_RNG_CLEAR_IT(). |
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332 * The clock error has no impact on the previously generated |
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333 * random numbers, and the RNG_DR register contents can be used. |
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334 * @note In the case of a seed error, the generation of random numbers is |
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335 * interrupted as long as the SECS bit is '1'. If a number is |
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336 * available in the RNG_DR register, it must not be used because it may |
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337 * not have enough entropy. In this case, it is recommended to clear the |
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338 * SEIS bit using __HAL_RNG_CLEAR_IT(), then disable and enable |
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339 * the RNG peripheral to reinitialize and restart the RNG. |
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340 * @note User-written HAL_RNG_ErrorCallback() API is called once whether SEIS |
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341 * or CEIS are set. |
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342 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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343 * the configuration information for RNG. |
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344 * @retval None |
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345 |
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346 */ |
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347 void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng) |
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348 { |
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349 /* RNG clock error interrupt occurred */ |
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350 if((__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET) || (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET)) |
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351 { |
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352 /* Change RNG peripheral state */ |
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353 hrng->State = HAL_RNG_STATE_ERROR; |
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354 |
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355 HAL_RNG_ErrorCallback(hrng); |
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356 |
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357 /* Clear the clock error flag */ |
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358 __HAL_RNG_CLEAR_IT(hrng, RNG_IT_CEI|RNG_IT_SEI); |
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359 |
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360 } |
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361 |
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362 /* Check RNG data ready interrupt occurred */ |
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363 if(__HAL_RNG_GET_IT(hrng, RNG_IT_DRDY) != RESET) |
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364 { |
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365 /* Generate random number once, so disable the IT */ |
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366 __HAL_RNG_DISABLE_IT(hrng); |
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367 |
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368 /* Get the 32bit Random number (DRDY flag automatically cleared) */ |
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369 hrng->RandomNumber = hrng->Instance->DR; |
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370 |
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371 if(hrng->State != HAL_RNG_STATE_ERROR) |
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372 { |
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373 /* Change RNG peripheral state */ |
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374 hrng->State = HAL_RNG_STATE_READY; |
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375 |
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376 /* Data Ready callback */ |
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377 HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber); |
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378 } |
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379 } |
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380 } |
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381 |
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382 /** |
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383 * @brief Returns generated random number in polling mode (Obsolete) |
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384 * Use HAL_RNG_GenerateRandomNumber() API instead. |
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385 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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386 * the configuration information for RNG. |
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387 * @retval Random value |
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388 */ |
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389 uint32_t HAL_RNG_GetRandomNumber(RNG_HandleTypeDef *hrng) |
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390 { |
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391 if(HAL_RNG_GenerateRandomNumber(hrng, &(hrng->RandomNumber)) == HAL_OK) |
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392 { |
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393 return hrng->RandomNumber; |
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394 } |
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395 else |
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396 { |
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397 return 0U; |
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398 } |
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399 } |
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400 |
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401 /** |
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402 * @brief Returns a 32-bit random number with interrupt enabled (Obsolete), |
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403 * Use HAL_RNG_GenerateRandomNumber_IT() API instead. |
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404 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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405 * the configuration information for RNG. |
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406 * @retval 32-bit random number |
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407 */ |
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408 uint32_t HAL_RNG_GetRandomNumber_IT(RNG_HandleTypeDef *hrng) |
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409 { |
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410 uint32_t random32bit = 0U; |
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411 |
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412 /* Process locked */ |
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413 __HAL_LOCK(hrng); |
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414 |
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415 /* Change RNG peripheral state */ |
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416 hrng->State = HAL_RNG_STATE_BUSY; |
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417 |
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418 /* Get a 32bit Random number */ |
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419 random32bit = hrng->Instance->DR; |
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420 |
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421 /* Enable the RNG Interrupts: Data Ready, Clock error, Seed error */ |
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422 __HAL_RNG_ENABLE_IT(hrng); |
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423 |
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424 /* Return the 32 bit random number */ |
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425 return random32bit; |
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426 } |
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427 |
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428 /** |
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429 * @brief Read latest generated random number. |
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430 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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431 * the configuration information for RNG. |
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432 * @retval random value |
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433 */ |
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434 uint32_t HAL_RNG_ReadLastRandomNumber(RNG_HandleTypeDef *hrng) |
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435 { |
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436 return(hrng->RandomNumber); |
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437 } |
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438 |
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439 /** |
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440 * @brief Data Ready callback in non-blocking mode. |
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441 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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442 * the configuration information for RNG. |
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443 * @param random32bit generated random number. |
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444 * @retval None |
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445 */ |
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446 __weak void HAL_RNG_ReadyDataCallback(RNG_HandleTypeDef *hrng, uint32_t random32bit) |
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447 { |
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448 /* Prevent unused argument(s) compilation warning */ |
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449 UNUSED(hrng); |
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450 UNUSED(random32bit); |
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451 /* NOTE : This function should not be modified. When the callback is needed, |
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452 function HAL_RNG_ReadyDataCallback must be implemented in the user file. |
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453 */ |
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454 } |
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455 |
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456 /** |
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457 * @brief RNG error callbacks. |
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458 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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459 * the configuration information for RNG. |
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460 * @retval None |
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461 */ |
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462 __weak void HAL_RNG_ErrorCallback(RNG_HandleTypeDef *hrng) |
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463 { |
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464 /* Prevent unused argument(s) compilation warning */ |
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465 UNUSED(hrng); |
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466 /* NOTE : This function should not be modified. When the callback is needed, |
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467 function HAL_RNG_ErrorCallback must be implemented in the user file. |
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468 */ |
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469 } |
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470 /** |
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471 * @} |
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472 */ |
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473 |
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474 |
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475 /** @addtogroup RNG_Exported_Functions_Group3 |
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476 * @brief Peripheral State functions |
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477 * |
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478 @verbatim |
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479 =============================================================================== |
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480 ##### Peripheral State functions ##### |
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481 =============================================================================== |
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482 [..] |
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483 This subsection permits to get in run-time the status of the peripheral |
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484 and the data flow. |
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485 |
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486 @endverbatim |
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487 * @{ |
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488 */ |
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489 |
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490 /** |
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491 * @brief Returns the RNG state. |
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492 * @param hrng pointer to a RNG_HandleTypeDef structure that contains |
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493 * the configuration information for RNG. |
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494 * @retval HAL state |
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495 */ |
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496 HAL_RNG_StateTypeDef HAL_RNG_GetState(RNG_HandleTypeDef *hrng) |
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497 { |
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498 return hrng->State; |
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499 } |
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500 |
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501 /** |
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502 * @} |
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503 */ |
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504 |
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505 /** |
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506 * @} |
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507 */ |
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508 |
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509 #endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F427xx || STM32F437xx ||\ |
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510 STM32F429xx || STM32F439xx || STM32F410xx || STM32F469xx || STM32F479xx || STM32F412Zx ||\ |
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511 STM32F412Vx || STM32F412Rx || STM32F412Cx || STM32F413xx || STM32F423xx */ |
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512 |
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513 #endif /* HAL_RNG_MODULE_ENABLED */ |
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514 |
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515 /** |
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516 * @} |
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517 */ |
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518 |
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519 /** |
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520 * @} |
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521 */ |
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522 |
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523 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |