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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****/
|
