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annotate Common/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_wwdg.c @ 489:0e7c16dd774d

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author heinrichsweikamp
date Mon, 29 Jun 2020 16:18:17 +0200
parents c78bcbd5deda
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128
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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 /**
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305 * @}
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306 */
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307
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308 /**
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309 * @}
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310 */
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311
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312 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/