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annotate Common/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_crc.c @ 390:cad6f8dfacab

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Merged in janlmulder/ostc4/maintain-1 (pull request #35) Repo maintenace
author heinrichsweikamp <bitbucket@heinrichsweikamp.com>
date Mon, 02 Dec 2019 07:56:47 +0000
parents c78bcbd5deda
children
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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****/