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annotate Common/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_crc.c @ 247:3949781096d4 bm-1

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feature: Relative GF to Saturation renames Rename relevant code from Relative GF to Saturation. Involving UI elements, variable names, translated texts (that still need to be done), etc. No functional changes. Notice that I chose super_saturation as name, to provide a better link to the hwOS repo. Further notice that the TXT variable name is not changed. This is intensional, as there is also a desaturation variable, so things might get confusing renaming the TXT variable name. Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
author Jan Mulder <jlmulder@xs4all.nl>
date Tue, 09 Apr 2019 16:30:21 +0200
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1 /**
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2 ******************************************************************************
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3 * @file stm32f4xx_hal_crc.c
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4 * @author MCD Application Team
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5 * @brief CRC 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 Cyclic Redundancy Check (CRC) peripheral:
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8 * + Initialization and 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 CRC HAL driver can be used as follows:
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18
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19 (#) Enable CRC AHB clock using __HAL_RCC_CRC_CLK_ENABLE();
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20
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21 (#) Use HAL_CRC_Accumulate() function to compute the CRC value of
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22 a 32-bit data buffer using combination of the previous CRC value
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23 and the new one.
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24
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25 (#) Use HAL_CRC_Calculate() function to compute the CRC Value of
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26 a new 32-bit data buffer. This function resets the CRC computation
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27 unit before starting the computation to avoid getting wrong CRC values.
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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>&copy; COPYRIGHT(c) 2017 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 /** @addtogroup CRC
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68 * @{
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69 */
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70
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71 #ifdef HAL_CRC_MODULE_ENABLED
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72
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73 /* Private typedef -----------------------------------------------------------*/
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74 /* Private define ------------------------------------------------------------*/
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75 /* Private macro -------------------------------------------------------------*/
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76 /* Private variables ---------------------------------------------------------*/
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77 /* Private function prototypes -----------------------------------------------*/
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78 /* Private functions ---------------------------------------------------------*/
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79 /* Exported functions --------------------------------------------------------*/
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80
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81 /** @addtogroup CRC_Exported_Functions
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82 * @{
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83 */
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84
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85 /** @addtogroup CRC_Exported_Functions_Group1
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86 * @brief Initialization and de-initialization functions
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87 *
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88 @verbatim
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89 ==============================================================================
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90 ##### Initialization and de-initialization functions #####
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91 ==============================================================================
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92 [..] This section provides functions allowing to:
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93 (+) Initialize the CRC according to the specified parameters
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94 in the CRC_InitTypeDef and create the associated handle
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95 (+) DeInitialize the CRC peripheral
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96 (+) Initialize the CRC MSP
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97 (+) DeInitialize CRC MSP
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98
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99 @endverbatim
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100 * @{
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101 */
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102
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103 /**
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104 * @brief Initializes the CRC according to the specified
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105 * parameters in the CRC_InitTypeDef and creates the associated handle.
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106 * @param hcrc pointer to a CRC_HandleTypeDef structure that contains
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107 * the configuration information for CRC
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108 * @retval HAL status
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109 */
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110 HAL_StatusTypeDef HAL_CRC_Init(CRC_HandleTypeDef *hcrc)
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111 {
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112 /* Check the CRC handle allocation */
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113 if(hcrc == NULL)
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114 {
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115 return HAL_ERROR;
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116 }
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117
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118 /* Check the parameters */
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119 assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));
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120
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121 if(hcrc->State == HAL_CRC_STATE_RESET)
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122 {
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123 /* Allocate lock resource and initialize it */
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124 hcrc->Lock = HAL_UNLOCKED;
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125 /* Init the low level hardware */
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126 HAL_CRC_MspInit(hcrc);
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127 }
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128
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129 /* Change CRC peripheral state */
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130 hcrc->State = HAL_CRC_STATE_BUSY;
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131
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132 /* Change CRC peripheral state */
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133 hcrc->State = HAL_CRC_STATE_READY;
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134
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135 /* Return function status */
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136 return HAL_OK;
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137 }
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138
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139 /**
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140 * @brief DeInitializes the CRC peripheral.
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141 * @param hcrc pointer to a CRC_HandleTypeDef structure that contains
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142 * the configuration information for CRC
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143 * @retval HAL status
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144 */
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145 HAL_StatusTypeDef HAL_CRC_DeInit(CRC_HandleTypeDef *hcrc)
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146 {
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147 /* Check the CRC handle allocation */
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148 if(hcrc == NULL)
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149 {
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150 return HAL_ERROR;
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151 }
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152
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153 /* Check the parameters */
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154 assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));
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155
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156 /* Change CRC peripheral state */
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157 hcrc->State = HAL_CRC_STATE_BUSY;
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158
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159 /* DeInit the low level hardware */
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160 HAL_CRC_MspDeInit(hcrc);
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161
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162 /* Change CRC peripheral state */
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163 hcrc->State = HAL_CRC_STATE_RESET;
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164
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165 /* Release Lock */
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166 __HAL_UNLOCK(hcrc);
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167
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168 /* Return function status */
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169 return HAL_OK;
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170 }
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171
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172 /**
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173 * @brief Initializes the CRC MSP.
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174 * @param hcrc pointer to a CRC_HandleTypeDef structure that contains
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175 * the configuration information for CRC
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176 * @retval None
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177 */
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178 __weak void HAL_CRC_MspInit(CRC_HandleTypeDef *hcrc)
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179 {
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180 /* Prevent unused argument(s) compilation warning */
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181 UNUSED(hcrc);
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182 /* NOTE : This function Should not be modified, when the callback is needed,
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183 the HAL_CRC_MspInit could be implemented in the user file
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184 */
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185 }
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186
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187 /**
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188 * @brief DeInitializes the CRC MSP.
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189 * @param hcrc pointer to a CRC_HandleTypeDef structure that contains
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190 * the configuration information for CRC
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191 * @retval None
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192 */
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193 __weak void HAL_CRC_MspDeInit(CRC_HandleTypeDef *hcrc)
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194 {
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195 /* Prevent unused argument(s) compilation warning */
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196 UNUSED(hcrc);
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197 /* NOTE : This function Should not be modified, when the callback is needed,
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198 the HAL_CRC_MspDeInit could be implemented in the user file
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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 /** @addtogroup CRC_Exported_Functions_Group2
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207 * @brief Peripheral Control functions
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208 *
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209 @verbatim
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210 ==============================================================================
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211 ##### Peripheral Control functions #####
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212 ==============================================================================
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213 [..] This section provides functions allowing to:
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214 (+) Compute the 32-bit CRC value of 32-bit data buffer,
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215 using combination of the previous CRC value and the new one.
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216 (+) Compute the 32-bit CRC value of 32-bit data buffer,
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217 independently of the previous CRC value.
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218
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219 @endverbatim
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220 * @{
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221 */
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222
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223 /**
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224 * @brief Computes the 32-bit CRC of 32-bit data buffer using combination
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225 * of the previous CRC value and the new one.
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226 * @param hcrc pointer to a CRC_HandleTypeDef structure that contains
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227 * the configuration information for CRC
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228 * @param pBuffer pointer to the buffer containing the data to be computed
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229 * @param BufferLength length of the buffer to be computed
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230 * @retval 32-bit CRC
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231 */
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232 uint32_t HAL_CRC_Accumulate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)
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233 {
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234 uint32_t index = 0U;
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235
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236 /* Process Locked */
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237 __HAL_LOCK(hcrc);
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238
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239 /* Change CRC peripheral state */
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240 hcrc->State = HAL_CRC_STATE_BUSY;
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241
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242 /* Enter Data to the CRC calculator */
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243 for(index = 0U; index < BufferLength; index++)
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244 {
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245 hcrc->Instance->DR = pBuffer[index];
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246 }
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247
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248 /* Change CRC peripheral state */
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249 hcrc->State = HAL_CRC_STATE_READY;
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250
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251 /* Process Unlocked */
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252 __HAL_UNLOCK(hcrc);
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253
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254 /* Return the CRC computed value */
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255 return hcrc->Instance->DR;
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256 }
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257
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258 /**
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259 * @brief Computes the 32-bit CRC of 32-bit data buffer independently
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260 * of the previous CRC value.
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261 * @param hcrc pointer to a CRC_HandleTypeDef structure that contains
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262 * the configuration information for CRC
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263 * @param pBuffer Pointer to the buffer containing the data to be computed
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264 * @param BufferLength Length of the buffer to be computed
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265 * @retval 32-bit CRC
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266 */
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267 uint32_t HAL_CRC_Calculate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)
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268 {
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269 uint32_t index = 0U;
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270
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271 /* Process Locked */
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272 __HAL_LOCK(hcrc);
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273
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274 /* Change CRC peripheral state */
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275 hcrc->State = HAL_CRC_STATE_BUSY;
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276
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277 /* Reset CRC Calculation Unit */
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278 __HAL_CRC_DR_RESET(hcrc);
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279
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280 /* Enter Data to the CRC calculator */
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281 for(index = 0U; index < BufferLength; index++)
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282 {
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283 hcrc->Instance->DR = pBuffer[index];
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284 }
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285
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286 /* Change CRC peripheral state */
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287 hcrc->State = HAL_CRC_STATE_READY;
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288
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289 /* Process Unlocked */
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290 __HAL_UNLOCK(hcrc);
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291
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292 /* Return the CRC computed value */
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293 return hcrc->Instance->DR;
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294 }
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295
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296 /**
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297 * @}
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298 */
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299
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300
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301 /** @addtogroup CRC_Exported_Functions_Group3
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302 * @brief Peripheral State functions
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303 *
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304 @verbatim
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305 ==============================================================================
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306 ##### Peripheral State functions #####
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307 ==============================================================================
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308 [..]
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309 This subsection permits to get in run-time the status of the peripheral
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310 and the data flow.
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311
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312 @endverbatim
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313 * @{
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314 */
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315
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316 /**
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317 * @brief Returns the CRC state.
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318 * @param hcrc pointer to a CRC_HandleTypeDef structure that contains
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319 * the configuration information for CRC
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320 * @retval HAL state
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321 */
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322 HAL_CRC_StateTypeDef HAL_CRC_GetState(CRC_HandleTypeDef *hcrc)
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323 {
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324 return hcrc->State;
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325 }
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326
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327 /**
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328 * @}
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329 */
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330
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331 /**
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332 * @}
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333 */
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334
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335 #endif /* HAL_CRC_MODULE_ENABLED */
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336 /**
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337 * @}
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338 */
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339
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340 /**
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341 * @}
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342 */
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343
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344 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/