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 | * @version V1.4.1
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6 | * @date 09-October-2015
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7 | * @brief WWDG HAL module driver.
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8 | * This file provides firmware functions to manage the following
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9 | * functionalities of the Window Watchdog (WWDG) peripheral:
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10 | * + Initialization and de-initialization functions
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11 | * + IO operation functions
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12 | * + Peripheral State functions
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13 | @verbatim
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14 | ==============================================================================
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15 | ##### WWDG specific features #####
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16 | ==============================================================================
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17 | [..]
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18 | Once enabled the WWDG generates a system reset on expiry of a programmed
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19 | time period, unless the program refreshes the counter (downcounter)
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20 | before reaching 0x3F value (i.e. a reset is generated when the counter
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21 | value rolls over from 0x40 to 0x3F).
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22 |
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23 | (+) An MCU reset is also generated if the counter value is refreshed
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24 | before the counter has reached the refresh window value. This
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25 | implies that the counter must be refreshed in a limited window.
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26 | (+) Once enabled the WWDG cannot be disabled except by a system reset.
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27 | (+) WWDGRST flag in RCC_CSR register can be used to inform when a WWDG
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28 | reset occurs.
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29 | (+) The WWDG counter input clock is derived from the APB clock divided
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30 | by a programmable prescaler.
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31 | (+) WWDG clock (Hz) = PCLK1 / (4096 * Prescaler)
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32 | (+) WWDG timeout (mS) = 1000 * Counter / WWDG clock
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33 | (+) WWDG Counter refresh is allowed between the following limits :
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34 | (++) min time (mS) = 1000 * (Counter Window) / WWDG clock
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35 | (++) max time (mS) = 1000 * (Counter 0x40) / WWDG clock
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36 |
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37 | (+) Min-max timeout value at 50 MHz(PCLK1): 81.9 us / 41.9 ms
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38 |
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39 |
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40 | ##### How to use this driver #####
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41 | ==============================================================================
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42 | [..]
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43 | (+) Enable WWDG APB1 clock using __HAL_RCC_WWDG_CLK_ENABLE().
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44 | (+) Set the WWDG prescaler, refresh window and counter value
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45 | using HAL_WWDG_Init() function.
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46 | (+) Start the WWDG using HAL_WWDG_Start() function.
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47 | When the WWDG is enabled the counter value should be configured to
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48 | a value greater than 0x40 to prevent generating an immediate reset.
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49 | (+) Optionally you can enable the Early Wakeup Interrupt (EWI) which is
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50 | generated when the counter reaches 0x40, and then start the WWDG using
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51 | HAL_WWDG_Start_IT(). At EWI HAL_WWDG_WakeupCallback is executed and user can
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52 | add his own code by customization of function pointer HAL_WWDG_WakeupCallback
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53 | Once enabled, EWI interrupt cannot be disabled except by a system reset.
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54 | (+) Then the application program must refresh the WWDG counter at regular
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55 | intervals during normal operation to prevent an MCU reset, using
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56 | HAL_WWDG_Refresh() function. This operation must occur only when
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57 | the counter is lower than the refresh window value already programmed.
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58 |
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59 | *** WWDG HAL driver macros list ***
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60 | ==================================
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61 | [..]
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62 | Below the list of most used macros in WWDG HAL driver.
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63 |
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64 | (+) __HAL_WWDG_ENABLE: Enable the WWDG peripheral
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65 | (+) __HAL_WWDG_GET_FLAG: Get the selected WWDG's flag status
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66 | (+) __HAL_WWDG_CLEAR_FLAG: Clear the WWDG's pending flags
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67 | (+) __HAL_WWDG_ENABLE_IT: Enables the WWDG early wake-up interrupt
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68 |
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69 | @endverbatim
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70 | ******************************************************************************
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71 | * @attention
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72 | *
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73 | * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
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74 | *
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75 | * Redistribution and use in source and binary forms, with or without modification,
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76 | * are permitted provided that the following conditions are met:
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77 | * 1. Redistributions of source code must retain the above copyright notice,
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78 | * this list of conditions and the following disclaimer.
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79 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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80 | * this list of conditions and the following disclaimer in the documentation
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81 | * and/or other materials provided with the distribution.
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82 | * 3. Neither the name of STMicroelectronics nor the names of its contributors
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83 | * may be used to endorse or promote products derived from this software
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84 | * without specific prior written permission.
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85 | *
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86 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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87 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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88 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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89 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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90 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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91 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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92 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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93 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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94 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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95 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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96 | *
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97 | ******************************************************************************
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98 | */
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99 |
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100 | /* Includes ------------------------------------------------------------------*/
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101 | #include "stm32f4xx_hal.h"
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102 |
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103 | /** @addtogroup STM32F4xx_HAL_Driver
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104 | * @{
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105 | */
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106 |
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107 | /** @defgroup WWDG WWDG
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108 | * @brief WWDG HAL module driver.
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109 | * @{
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110 | */
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111 |
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112 | #ifdef HAL_WWDG_MODULE_ENABLED
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113 |
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114 | /* Private typedef -----------------------------------------------------------*/
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115 | /* Private define ------------------------------------------------------------*/
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116 | /* Private macro -------------------------------------------------------------*/
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117 | /* Private variables ---------------------------------------------------------*/
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118 | /* Private function prototypes -----------------------------------------------*/
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119 | /* Exported functions --------------------------------------------------------*/
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120 | /** @defgroup WWDG_Exported_Functions WWDG Exported Functions
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121 | * @{
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122 | */
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123 |
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124 | /** @defgroup WWDG_Exported_Functions_Group1 Initialization and de-initialization functions
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125 | * @brief Initialization and Configuration functions.
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126 | *
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127 | @verbatim
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128 | ==============================================================================
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129 | ##### Initialization and de-initialization functions #####
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130 | ==============================================================================
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131 | [..]
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132 | This section provides functions allowing to:
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133 | (+) Initialize the WWDG according to the specified parameters
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134 | in the WWDG_InitTypeDef and create the associated handle
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135 | (+) DeInitialize the WWDG peripheral
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136 | (+) Initialize the WWDG MSP
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137 | (+) DeInitialize the WWDG MSP
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138 |
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139 | @endverbatim
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140 | * @{
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141 | */
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142 |
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143 | /**
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144 | * @brief Initializes the WWDG according to the specified
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145 | * parameters in the WWDG_InitTypeDef and creates the associated handle.
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146 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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147 | * the configuration information for the specified WWDG module.
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148 | * @retval HAL status
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149 | */
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150 | HAL_StatusTypeDef HAL_WWDG_Init(WWDG_HandleTypeDef *hwwdg)
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151 | {
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152 | /* Check the WWDG handle allocation */
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153 | if(hwwdg == NULL)
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154 | {
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155 | return HAL_ERROR;
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156 | }
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157 |
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158 | /* Check the parameters */
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159 | assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance));
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160 | assert_param(IS_WWDG_PRESCALER(hwwdg->Init.Prescaler));
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161 | assert_param(IS_WWDG_WINDOW(hwwdg->Init.Window));
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162 | assert_param(IS_WWDG_COUNTER(hwwdg->Init.Counter));
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163 |
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164 | if(hwwdg->State == HAL_WWDG_STATE_RESET)
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165 | {
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166 | /* Allocate lock resource and initialize it */
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167 | hwwdg->Lock = HAL_UNLOCKED;
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168 | /* Init the low level hardware */
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169 | HAL_WWDG_MspInit(hwwdg);
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170 | }
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171 |
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172 | /* Change WWDG peripheral state */
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173 | hwwdg->State = HAL_WWDG_STATE_BUSY;
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174 |
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175 | /* Set WWDG Prescaler and Window */
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176 | MODIFY_REG(hwwdg->Instance->CFR, (WWDG_CFR_WDGTB | WWDG_CFR_W), (hwwdg->Init.Prescaler | hwwdg->Init.Window));
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177 | /* Set WWDG Counter */
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178 | MODIFY_REG(hwwdg->Instance->CR, WWDG_CR_T, hwwdg->Init.Counter);
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179 |
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180 | /* Change WWDG peripheral state */
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181 | hwwdg->State = HAL_WWDG_STATE_READY;
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182 |
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183 | /* Return function status */
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184 | return HAL_OK;
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185 | }
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186 |
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187 | /**
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188 | * @brief DeInitializes the WWDG peripheral.
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189 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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190 | * the configuration information for the specified WWDG module.
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191 | * @retval HAL status
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192 | */
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193 | HAL_StatusTypeDef HAL_WWDG_DeInit(WWDG_HandleTypeDef *hwwdg)
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194 | {
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195 | /* Check the WWDG handle allocation */
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196 | if(hwwdg == NULL)
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197 | {
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198 | return HAL_ERROR;
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199 | }
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200 |
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201 | /* Check the parameters */
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202 | assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance));
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203 |
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204 | /* Change WWDG peripheral state */
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205 | hwwdg->State = HAL_WWDG_STATE_BUSY;
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206 |
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207 | /* DeInit the low level hardware */
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208 | HAL_WWDG_MspDeInit(hwwdg);
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209 |
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210 | /* Reset WWDG Control register */
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211 | hwwdg->Instance->CR = (uint32_t)0x0000007F;
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212 |
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213 | /* Reset WWDG Configuration register */
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214 | hwwdg->Instance->CFR = (uint32_t)0x0000007F;
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215 |
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216 | /* Reset WWDG Status register */
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217 | hwwdg->Instance->SR = 0;
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218 |
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219 | /* Change WWDG peripheral state */
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220 | hwwdg->State = HAL_WWDG_STATE_RESET;
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221 |
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222 | /* Release Lock */
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223 | __HAL_UNLOCK(hwwdg);
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224 |
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225 | /* Return function status */
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226 | return HAL_OK;
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227 | }
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228 |
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229 | /**
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230 | * @brief Initializes the WWDG MSP.
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231 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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232 | * the configuration information for the specified WWDG module.
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233 | * @retval None
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234 | */
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235 | __weak void HAL_WWDG_MspInit(WWDG_HandleTypeDef *hwwdg)
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236 | {
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237 | /* NOTE: This function Should not be modified, when the callback is needed,
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238 | the HAL_WWDG_MspInit could be implemented in the user file
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239 | */
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240 | }
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241 |
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242 | /**
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243 | * @brief DeInitializes the WWDG MSP.
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244 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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245 | * the configuration information for the specified WWDG module.
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246 | * @retval None
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247 | */
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248 | __weak void HAL_WWDG_MspDeInit(WWDG_HandleTypeDef *hwwdg)
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249 | {
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250 | /* NOTE: This function Should not be modified, when the callback is needed,
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251 | the HAL_WWDG_MspDeInit could be implemented in the user file
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252 | */
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253 | }
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254 |
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255 | /**
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256 | * @}
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257 | */
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258 |
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259 | /** @defgroup WWDG_Exported_Functions_Group2 IO operation functions
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260 | * @brief IO operation functions
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261 | *
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262 | @verbatim
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263 | ==============================================================================
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264 | ##### IO operation functions #####
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265 | ==============================================================================
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266 | [..]
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267 | This section provides functions allowing to:
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268 | (+) Start the WWDG.
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269 | (+) Refresh the WWDG.
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270 | (+) Handle WWDG interrupt request.
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271 |
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272 | @endverbatim
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273 | * @{
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274 | */
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275 |
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276 | /**
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277 | * @brief Starts the WWDG.
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278 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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279 | * the configuration information for the specified WWDG module.
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280 | * @retval HAL status
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281 | */
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282 | HAL_StatusTypeDef HAL_WWDG_Start(WWDG_HandleTypeDef *hwwdg)
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283 | {
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284 | /* Process Locked */
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285 | __HAL_LOCK(hwwdg);
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286 |
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287 | /* Change WWDG peripheral state */
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288 | hwwdg->State = HAL_WWDG_STATE_BUSY;
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289 |
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290 | /* Enable the peripheral */
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291 | __HAL_WWDG_ENABLE(hwwdg);
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292 |
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293 | /* Change WWDG peripheral state */
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294 | hwwdg->State = HAL_WWDG_STATE_READY;
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295 |
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296 | /* Process Unlocked */
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297 | __HAL_UNLOCK(hwwdg);
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298 |
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299 | /* Return function status */
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300 | return HAL_OK;
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301 | }
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302 |
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303 | /**
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304 | * @brief Starts the WWDG with interrupt enabled.
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305 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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306 | * the configuration information for the specified WWDG module.
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307 | * @retval HAL status
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308 | */
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309 | HAL_StatusTypeDef HAL_WWDG_Start_IT(WWDG_HandleTypeDef *hwwdg)
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310 | {
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311 | /* Process Locked */
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312 | __HAL_LOCK(hwwdg);
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313 |
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314 | /* Change WWDG peripheral state */
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315 | hwwdg->State = HAL_WWDG_STATE_BUSY;
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316 |
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317 | /* Enable the Early Wakeup Interrupt */
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318 | __HAL_WWDG_ENABLE_IT(hwwdg, WWDG_IT_EWI);
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319 |
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320 | /* Enable the peripheral */
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321 | __HAL_WWDG_ENABLE(hwwdg);
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322 |
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323 | /* Return function status */
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324 | return HAL_OK;
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325 | }
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326 |
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327 | /**
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328 | * @brief Refreshes the WWDG.
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329 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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330 | * the configuration information for the specified WWDG module.
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331 | * @param Counter: value of counter to put in WWDG counter
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332 | * @retval HAL status
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333 | */
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334 | HAL_StatusTypeDef HAL_WWDG_Refresh(WWDG_HandleTypeDef *hwwdg, uint32_t Counter)
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335 | {
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336 | /* Process Locked */
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337 | __HAL_LOCK(hwwdg);
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338 |
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339 | /* Change WWDG peripheral state */
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340 | hwwdg->State = HAL_WWDG_STATE_BUSY;
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341 |
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342 | /* Check the parameters */
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343 | assert_param(IS_WWDG_COUNTER(Counter));
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344 |
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345 | /* Write to WWDG CR the WWDG Counter value to refresh with */
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346 | MODIFY_REG(hwwdg->Instance->CR, (uint32_t)WWDG_CR_T, Counter);
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347 |
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348 | /* Change WWDG peripheral state */
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349 | hwwdg->State = HAL_WWDG_STATE_READY;
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350 |
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351 | /* Process Unlocked */
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352 | __HAL_UNLOCK(hwwdg);
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353 |
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354 | /* Return function status */
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355 | return HAL_OK;
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356 | }
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357 |
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358 | /**
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359 | * @brief Handles WWDG interrupt request.
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360 | * @note The Early Wakeup Interrupt (EWI) can be used if specific safety operations
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361 | * or data logging must be performed before the actual reset is generated.
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362 | * The EWI interrupt is enabled using __HAL_WWDG_ENABLE_IT() macro.
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363 | * When the downcounter reaches the value 0x40, and EWI interrupt is
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364 | * generated and the corresponding Interrupt Service Routine (ISR) can
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365 | * be used to trigger specific actions (such as communications or data
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366 | * logging), before resetting the device.
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367 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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368 | * the configuration information for the specified WWDG module.
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369 | * @retval None
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370 | */
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371 | void HAL_WWDG_IRQHandler(WWDG_HandleTypeDef *hwwdg)
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372 | {
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373 | /* Check if Early Wakeup Interrupt is enable */
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374 | if(__HAL_WWDG_GET_IT_SOURCE(hwwdg, WWDG_IT_EWI) != RESET)
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375 | {
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376 | /* Check if WWDG Early Wakeup Interrupt occurred */
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377 | if(__HAL_WWDG_GET_FLAG(hwwdg, WWDG_FLAG_EWIF) != RESET)
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378 | {
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379 | /* Early Wakeup callback */
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380 | HAL_WWDG_WakeupCallback(hwwdg);
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381 |
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382 | /* Change WWDG peripheral state */
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383 | hwwdg->State = HAL_WWDG_STATE_READY;
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384 |
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385 | /* Clear the WWDG Early Wakeup flag */
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386 | __HAL_WWDG_CLEAR_FLAG(hwwdg, WWDG_FLAG_EWIF);
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387 |
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388 | /* Process Unlocked */
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389 | __HAL_UNLOCK(hwwdg);
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390 | }
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391 | }
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392 | }
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393 |
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394 | /**
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395 | * @brief Early Wakeup WWDG callback.
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396 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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397 | * the configuration information for the specified WWDG module.
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398 | * @retval None
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399 | */
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400 | __weak void HAL_WWDG_WakeupCallback(WWDG_HandleTypeDef* hwwdg)
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401 | {
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402 | /* NOTE: This function Should not be modified, when the callback is needed,
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403 | the HAL_WWDG_WakeupCallback could be implemented in the user file
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404 | */
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405 | }
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406 |
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407 | /**
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408 | * @}
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409 | */
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410 |
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411 | /** @defgroup WWDG_Exported_Functions_Group3 Peripheral State functions
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412 | * @brief Peripheral State functions.
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413 | *
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414 | @verbatim
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415 | ==============================================================================
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416 | ##### Peripheral State functions #####
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417 | ==============================================================================
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418 | [..]
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419 | This subsection permits to get in run-time the status of the peripheral
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420 | and the data flow.
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421 |
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422 | @endverbatim
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423 | * @{
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424 | */
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425 |
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426 | /**
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427 | * @brief Returns the WWDG state.
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428 | * @param hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
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429 | * the configuration information for the specified WWDG module.
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430 | * @retval HAL state
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431 | */
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432 | HAL_WWDG_StateTypeDef HAL_WWDG_GetState(WWDG_HandleTypeDef *hwwdg)
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433 | {
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434 | return hwwdg->State;
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435 | }
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436 |
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437 | /**
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438 | * @}
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439 | */
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440 |
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441 | /**
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442 | * @}
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443 | */
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444 |
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445 | #endif /* HAL_WWDG_MODULE_ENABLED */
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446 | /**
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447 | * @}
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448 | */
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449 |
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450 | /**
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451 | * @}
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452 | */
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454 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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