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annotate Common/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_wwdg.c @ 752:4f19336a3f21

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Dev Bugfix: Alignment problem in lifedata structure: Since the introduction of the 64 bit DigO2 sensor ID the potential risk of a misalignment is present in the lifedata structure. E.g. If a new 8bit variable is added in front of the data structure containing the 64bit value. To avoid this in future the sensor data structure which may contain the 64bit value has been moved to the top of the structure (first element)
author Ideenmodellierer
date Tue, 07 Mar 2023 19:51:30 +0100
parents c78bcbd5deda
children
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1 /**
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2 ******************************************************************************
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3 * @file stm32f4xx_hal_wwdg.c
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4 * @author MCD Application Team
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5 * @brief WWDG 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 Window Watchdog (WWDG) peripheral:
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8 * + Initialization and de-initialization functions
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9 * + IO operation functions
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10 * + Peripheral State functions
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11 @verbatim
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12 ==============================================================================
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13 ##### WWDG specific features #####
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14 ==============================================================================
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15 [..]
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16 Once enabled the WWDG generates a system reset on expiry of a programmed
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17 time period, unless the program refreshes the counter (downcounter)
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18 before reaching 0x3F value (i.e. a reset is generated when the counter
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19 value rolls over from 0x40 to 0x3F).
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20
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21 (+) An MCU reset is also generated if the counter value is refreshed
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22 before the counter has reached the refresh window value. This
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23 implies that the counter must be refreshed in a limited window.
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24 (+) Once enabled the WWDG cannot be disabled except by a system reset.
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25 (+) WWDGRST flag in RCC_CSR register can be used to inform when a WWDG
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26 reset occurs.
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27 (+) The WWDG counter input clock is derived from the APB clock divided
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28 by a programmable prescaler.
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29 (+) WWDG clock (Hz) = PCLK1 / (4096 * Prescaler)
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30 (+) WWDG timeout (mS) = 1000 * Counter / WWDG clock
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31 (+) WWDG Counter refresh is allowed between the following limits :
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32 (++) min time (mS) = 1000 * (Counter _ Window) / WWDG clock
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33 (++) max time (mS) = 1000 * (Counter _ 0x40) / WWDG clock
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34
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35 (+) Min-max timeout value at 50 MHz(PCLK1): 81.9 us / 41.9 ms
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36
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37 (+) The Early Wakeup Interrupt (EWI) can be used if specific safety
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38 operations or data logging must be performed before the actual reset is
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39 generated. When the downcounter reaches the value 0x40, an EWI interrupt
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40 is generated and the corresponding interrupt service routine (ISR) can
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41 be used to trigger specific actions (such as communications or data
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42 logging), before resetting the device.
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43 In some applications, the EWI interrupt can be used to manage a software
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44 system check and/or system recovery/graceful degradation, without
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45 generating a WWDG reset. In this case, the corresponding interrupt
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46 service routine (ISR) should reload the WWDG counter to avoid the WWDG
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47 reset, then trigger the required actions.
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48 Note:When the EWI interrupt cannot be served, e.g. due to a system lock
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49 in a higher priority task, the WWDG reset will eventually be generated.
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50
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51 (+) Debug mode : When the microcontroller enters debug mode (core halted),
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52 the WWDG counter either continues to work normally or stops, depending
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53 on DBG_WWDG_STOP configuration bit in DBG module, accessible through
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54 __HAL_DBGMCU_FREEZE_WWDG() and __HAL_DBGMCU_UNFREEZE_WWDG() macros
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55
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56 ##### How to use this driver #####
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57 ==============================================================================
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58 [..]
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59 (+) Enable WWDG APB1 clock using __HAL_RCC_WWDG_CLK_ENABLE().
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60
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61 (+) Set the WWDG prescaler, refresh window, counter value and Early Wakeup
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62 Interrupt mode using using HAL_WWDG_Init() function.
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63 This enables WWDG peripheral and the downcounter starts downcounting
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64 from given counter value.
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65 Init function can be called again to modify all watchdog parameters,
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66 however if EWI mode has been set once, it can't be clear until next
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67 reset.
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68
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69 (+) The application program must refresh the WWDG counter at regular
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70 intervals during normal operation to prevent an MCU reset using
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71 HAL_WWDG_Refresh() function. This operation must occur only when
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72 the counter is lower than the window value already programmed.
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73
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74 (+) if Early Wakeup Interrupt mode is enable an interrupt is generated when
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75 the counter reaches 0x40. User can add his own code in weak function
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76 HAL_WWDG_EarlyWakeupCallback().
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77
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78 *** WWDG HAL driver macros list ***
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79 ==================================
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80 [..]
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81 Below the list of most used macros in WWDG HAL driver.
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82
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83 (+) __HAL_WWDG_GET_IT_SOURCE: Check the selected WWDG's interrupt source.
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84 (+) __HAL_WWDG_GET_FLAG: Get the selected WWDG's flag status.
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85 (+) __HAL_WWDG_CLEAR_FLAG: Clear the WWDG's pending flags.
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86
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87 @endverbatim
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88 ******************************************************************************
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89 * @attention
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90 *
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91 * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
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92 *
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93 * Redistribution and use in source and binary forms, with or without modification,
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94 * are permitted provided that the following conditions are met:
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95 * 1. Redistributions of source code must retain the above copyright notice,
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96 * this list of conditions and the following disclaimer.
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97 * 2. Redistributions in binary form must reproduce the above copyright notice,
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98 * this list of conditions and the following disclaimer in the documentation
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99 * and/or other materials provided with the distribution.
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100 * 3. Neither the name of STMicroelectronics nor the names of its contributors
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101 * may be used to endorse or promote products derived from this software
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102 * without specific prior written permission.
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103 *
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104 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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105 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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106 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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107 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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108 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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109 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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110 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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111 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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112 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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113 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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114 *
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115 ******************************************************************************
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116 */
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117
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118 /* Includes ------------------------------------------------------------------*/
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119 #include "stm32f4xx_hal.h"
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120
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121 /** @addtogroup STM32F4xx_HAL_Driver
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122 * @{
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123 */
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124
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125 #ifdef HAL_WWDG_MODULE_ENABLED
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126 /** @defgroup WWDG WWDG
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127 * @brief WWDG HAL module driver.
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128 * @{
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129 */
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130
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131 /* Private typedef -----------------------------------------------------------*/
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132 /* Private define ------------------------------------------------------------*/
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133 /* Private macro -------------------------------------------------------------*/
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134 /* Private variables ---------------------------------------------------------*/
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135 /* Private function prototypes -----------------------------------------------*/
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136 /* Exported functions --------------------------------------------------------*/
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137
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138 /** @defgroup WWDG_Exported_Functions WWDG Exported Functions
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139 * @{
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140 */
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141
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142 /** @defgroup WWDG_Exported_Functions_Group1 Initialization and Configuration functions
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143 * @brief Initialization and Configuration functions.
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144 *
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145 @verbatim
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146 ==============================================================================
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147 ##### Initialization and Configuration functions #####
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148 ==============================================================================
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149 [..]
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150 This section provides functions allowing to:
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151 (+) Initialize and start the WWDG according to the specified parameters
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152 in the WWDG_InitTypeDef of associated handle.
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153 (+) Initialize the WWDG MSP.
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154
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155 @endverbatim
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156 * @{
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157 */
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158
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159 /**
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160 * @brief Initialize the WWDG according to the specified.
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161 * parameters in the WWDG_InitTypeDef of associated handle.
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162 * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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163 * the configuration information for the specified WWDG module.
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164 * @retval HAL status
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165 */
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166 HAL_StatusTypeDef HAL_WWDG_Init(WWDG_HandleTypeDef *hwwdg)
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167 {
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168 /* Check the WWDG handle allocation */
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169 if(hwwdg == NULL)
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170 {
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171 return HAL_ERROR;
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172 }
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173
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174 /* Check the parameters */
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175 assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance));
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176 assert_param(IS_WWDG_PRESCALER(hwwdg->Init.Prescaler));
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177 assert_param(IS_WWDG_WINDOW(hwwdg->Init.Window));
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178 assert_param(IS_WWDG_COUNTER(hwwdg->Init.Counter));
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179 assert_param(IS_WWDG_EWI_MODE(hwwdg->Init.EWIMode));
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180
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181 /* Init the low level hardware */
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182 HAL_WWDG_MspInit(hwwdg);
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183
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184 /* Set WWDG Counter */
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185 WRITE_REG(hwwdg->Instance->CR, (WWDG_CR_WDGA | hwwdg->Init.Counter));
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186
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187 /* Set WWDG Prescaler and Window */
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188 WRITE_REG(hwwdg->Instance->CFR, (hwwdg->Init.EWIMode | hwwdg->Init.Prescaler | hwwdg->Init.Window));
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189
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190 /* Return function status */
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191 return HAL_OK;
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192 }
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193
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194 /**
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195 * @brief Initialize the WWDG MSP.
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196 * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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197 * the configuration information for the specified WWDG module.
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198 * @note When rewriting this function in user file, mechanism may be added
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199 * to avoid multiple initialize when HAL_WWDG_Init function is called
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200 * again to change parameters.
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201 * @retval None
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202 */
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203 __weak void HAL_WWDG_MspInit(WWDG_HandleTypeDef *hwwdg)
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204 {
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205 /* Prevent unused argument(s) compilation warning */
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206 UNUSED(hwwdg);
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207
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208 /* NOTE: This function should not be modified, when the callback is needed,
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209 the HAL_WWDG_MspInit could be implemented in the user file
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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
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217 /** @defgroup WWDG_Exported_Functions_Group2 IO operation functions
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218 * @brief IO operation functions
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219 *
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220 @verbatim
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221 ==============================================================================
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222 ##### IO operation functions #####
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223 ==============================================================================
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224 [..]
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225 This section provides functions allowing to:
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226 (+) Refresh the WWDG.
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227 (+) Handle WWDG interrupt request and associated function callback.
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228
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229 @endverbatim
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230 * @{
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231 */
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232
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233 /**
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234 * @brief Refresh the WWDG.
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235 * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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236 * the configuration information for the specified WWDG module.
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237 * @retval HAL status
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238 */
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239 HAL_StatusTypeDef HAL_WWDG_Refresh(WWDG_HandleTypeDef *hwwdg)
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240 {
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241 /* Write to WWDG CR the WWDG Counter value to refresh with */
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242 WRITE_REG(hwwdg->Instance->CR, (hwwdg->Init.Counter));
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243
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244 /* Return function status */
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245 return HAL_OK;
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246 }
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247
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248 /**
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249 * @brief Handle WWDG interrupt request.
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250 * @note The Early Wakeup Interrupt (EWI) can be used if specific safety operations
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251 * or data logging must be performed before the actual reset is generated.
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252 * The EWI interrupt is enabled by calling HAL_WWDG_Init function with
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253 * EWIMode set to WWDG_EWI_ENABLE.
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254 * When the downcounter reaches the value 0x40, and EWI interrupt is
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255 * generated and the corresponding Interrupt Service Routine (ISR) can
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256 * be used to trigger specific actions (such as communications or data
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257 * logging), before resetting the device.
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258 * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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259 * the configuration information for the specified WWDG module.
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260 * @retval None
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261 */
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262 void HAL_WWDG_IRQHandler(WWDG_HandleTypeDef *hwwdg)
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263 {
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264 /* Check if Early Wakeup Interrupt is enable */
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265 if(__HAL_WWDG_GET_IT_SOURCE(hwwdg, WWDG_IT_EWI) != RESET)
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266 {
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267 /* Check if WWDG Early Wakeup Interrupt occurred */
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268 if(__HAL_WWDG_GET_FLAG(hwwdg, WWDG_FLAG_EWIF) != RESET)
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269 {
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270 /* Clear the WWDG Early Wakeup flag */
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271 __HAL_WWDG_CLEAR_FLAG(hwwdg, WWDG_FLAG_EWIF);
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272
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273 /* Early Wakeup callback */
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274 HAL_WWDG_EarlyWakeupCallback(hwwdg);
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275 }
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276 }
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277 }
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278
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279 /**
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280 * @brief WWDG Early Wakeup callback.
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281 * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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282 * the configuration information for the specified WWDG module.
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283 * @retval None
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284 */
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285 __weak void HAL_WWDG_EarlyWakeupCallback(WWDG_HandleTypeDef* hwwdg)
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286 {
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287 /* Prevent unused argument(s) compilation warning */
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288 UNUSED(hwwdg);
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289
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290 /* NOTE: This function should not be modified, when the callback is needed,
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291 the HAL_WWDG_EarlyWakeupCallback could be implemented in the user file
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292 */
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293 }
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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 */
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302
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303 #endif /* HAL_WWDG_MODULE_ENABLED */
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304 /**
c78bcbd5deda Added current STM32 standandard libraries in version independend folder structure
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305 * @}
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306 */
c78bcbd5deda Added current STM32 standandard libraries in version independend folder structure
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307
c78bcbd5deda Added current STM32 standandard libraries in version independend folder structure
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308 /**
c78bcbd5deda Added current STM32 standandard libraries in version independend folder structure
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309 * @}
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310 */
c78bcbd5deda Added current STM32 standandard libraries in version independend folder structure
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311
c78bcbd5deda Added current STM32 standandard libraries in version independend folder structure
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312 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/