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annotate Common/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.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_iwdg.c
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4 * @author MCD Application Team
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5 * @brief IWDG 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 Independent Watchdog (IWDG) peripheral:
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8 * + Initialization and Start functions
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9 * + IO operation functions
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10 *
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11 @verbatim
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12 ==============================================================================
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13 ##### IWDG Generic features #####
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14 ==============================================================================
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15 [..]
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16 (+) The IWDG can be started by either software or hardware (configurable
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17 through option byte).
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18
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19 (+) The IWDG is clocked by Low-Speed clock (LSI) and thus stays active even
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20 if the main clock fails.
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21
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22 (+) Once the IWDG is started, the LSI is forced ON and both can not be
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23 disabled. The counter starts counting down from the reset value (0xFFF).
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24 When it reaches the end of count value (0x000) a reset signal is
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25 generated (IWDG reset).
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26
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27 (+) Whenever the key value 0x0000 AAAA is written in the IWDG_KR register,
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28 the IWDG_RLR value is reloaded in the counter and the watchdog reset is
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29 prevented.
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30
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31 (+) The IWDG is implemented in the VDD voltage domain that is still functional
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32 in STOP and STANDBY mode (IWDG reset can wake-up from STANDBY).
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33 IWDGRST flag in RCC_CSR register can be used to inform when an IWDG
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34 reset occurs.
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35
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36 (+) Debug mode : When the microcontroller enters debug mode (core halted),
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37 the IWDG counter either continues to work normally or stops, depending
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38 on DBG_IWDG_STOP configuration bit in DBG module, accessible through
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39 __HAL_DBGMCU_FREEZE_IWDG() and __HAL_DBGMCU_UNFREEZE_IWDG() macros
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40
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41 [..] Min-max timeout value @32KHz (LSI): ~125us / ~32.7s
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42 The IWDG timeout may vary due to LSI frequency dispersion. STM32F4xx
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43 devices provide the capability to measure the LSI frequency (LSI clock
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44 connected internally to TIM5 CH4 input capture). The measured value
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45 can be used to have an IWDG timeout with an acceptable accuracy.
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46
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47 ##### How to use this driver #####
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48 ==============================================================================
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49 [..]
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50 (#) Use IWDG using HAL_IWDG_Init() function to :
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51 (++) Enable instance by writing Start keyword in IWDG_KEY register. LSI
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52 clock is forced ON and IWDG counter starts downcounting.
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53 (++) Enable write access to configuration register: IWDG_PR & IWDG_RLR.
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54 (++) Configure the IWDG prescaler and counter reload value. This reload
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55 value will be loaded in the IWDG counter each time the watchdog is
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56 reloaded, then the IWDG will start counting down from this value.
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57 (++) wait for status flags to be reset"
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58
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59 (#) Then the application program must refresh the IWDG counter at regular
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60 intervals during normal operation to prevent an MCU reset, using
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61 HAL_IWDG_Refresh() function.
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62
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63 *** IWDG HAL driver macros list ***
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64 ====================================
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65 [..]
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66 Below the list of most used macros in IWDG HAL driver:
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67 (+) __HAL_IWDG_START: Enable the IWDG peripheral
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68 (+) __HAL_IWDG_RELOAD_COUNTER: Reloads IWDG counter with value defined in
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69 the reload register
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70
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71 @endverbatim
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72 ******************************************************************************
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73 * @attention
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74 *
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75 * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
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76 *
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77 * Redistribution and use in source and binary forms, with or without modification,
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78 * are permitted provided that the following conditions are met:
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79 * 1. Redistributions of source code must retain the above copyright notice,
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80 * this list of conditions and the following disclaimer.
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81 * 2. Redistributions in binary form must reproduce the above copyright notice,
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82 * this list of conditions and the following disclaimer in the documentation
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83 * and/or other materials provided with the distribution
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84 * 3. Neither the name of STMicroelectronics nor the names of its contributors
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85 * may be used to endorse or promote products derived from this software
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86 * without specific prior written permission.
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87 *
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88 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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89 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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91 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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94 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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95 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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96 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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97 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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98 *
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99 ******************************************************************************
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100 */
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101
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102 /* Includes ------------------------------------------------------------------*/
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103 #include "stm32f4xx_hal.h"
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104
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105 /** @addtogroup STM32F4xx_HAL_Driver
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106 * @{
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107 */
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108
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109 #ifdef HAL_IWDG_MODULE_ENABLED
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110 /** @defgroup IWDG IWDG
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111 * @brief IWDG HAL module driver.
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112 * @{
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113 */
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114
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115 /* Private typedef -----------------------------------------------------------*/
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116 /* Private define ------------------------------------------------------------*/
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117 /** @defgroup IWDG_Private_Defines IWDG Private Defines
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118 * @{
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119 */
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120 /* Status register need 5 RC LSI divided by prescaler clock to be updated. With
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121 higher prescaler (256), and according to HSI variation, we need to wait at
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122 least 6 cycles so 48 ms. */
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123 #define HAL_IWDG_DEFAULT_TIMEOUT 48U
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124 /**
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125 * @}
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126 */
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127
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128 /* Private macro -------------------------------------------------------------*/
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129 /* Private variables ---------------------------------------------------------*/
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130 /* Private function prototypes -----------------------------------------------*/
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131 /* Exported functions --------------------------------------------------------*/
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132
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133 /** @addtogroup IWDG_Exported_Functions
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134 * @{
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135 */
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136
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137 /** @addtogroup IWDG_Exported_Functions_Group1
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138 * @brief Initialization and Start functions.
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139 *
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140 @verbatim
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141 ===============================================================================
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142 ##### Initialization and Start functions #####
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143 ===============================================================================
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144 [..] This section provides functions allowing to:
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145 (+) Initialize the IWDG according to the specified parameters in the
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146 IWDG_InitTypeDef of associated handle.
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147 (+) Once initialization is performed in HAL_IWDG_Init function, Watchdog
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148 is reloaded in order to exit function with correct time base.
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149
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150 @endverbatim
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151 * @{
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152 */
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153
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154 /**
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155 * @brief Initialize the IWDG according to the specified parameters in the
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156 * IWDG_InitTypeDef and start watchdog. Before exiting function,
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157 * watchdog is refreshed in order to have correct time base.
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158 * @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
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159 * the configuration information for the specified IWDG module.
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160 * @retval HAL status
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161 */
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162 HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg)
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163 {
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164 uint32_t tickstart;
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165
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166 /* Check the IWDG handle allocation */
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167 if(hiwdg == NULL)
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168 {
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169 return HAL_ERROR;
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170 }
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171
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172 /* Check the parameters */
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173 assert_param(IS_IWDG_ALL_INSTANCE(hiwdg->Instance));
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174 assert_param(IS_IWDG_PRESCALER(hiwdg->Init.Prescaler));
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175 assert_param(IS_IWDG_RELOAD(hiwdg->Init.Reload));
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176
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177 /* Enable IWDG. LSI is turned on automaticaly */
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178 __HAL_IWDG_START(hiwdg);
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179
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180 /* Enable write access to IWDG_PR and IWDG_RLR registers by writing 0x5555 in KR */
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181 IWDG_ENABLE_WRITE_ACCESS(hiwdg);
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182
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183 /* Write to IWDG registers the Prescaler & Reload values to work with */
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184 hiwdg->Instance->PR = hiwdg->Init.Prescaler;
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185 hiwdg->Instance->RLR = hiwdg->Init.Reload;
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186
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187 /* Check pending flag, if previous update not done, return timeout */
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188 tickstart = HAL_GetTick();
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189
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190 /* Wait for register to be updated */
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191 while(hiwdg->Instance->SR != RESET)
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192 {
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193 if((HAL_GetTick() - tickstart ) > HAL_IWDG_DEFAULT_TIMEOUT)
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194 {
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195 return HAL_TIMEOUT;
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196 }
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197 }
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198
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199 /* Reload IWDG counter with value defined in the reload register */
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200 __HAL_IWDG_RELOAD_COUNTER(hiwdg);
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201
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202 /* Return function status */
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203 return HAL_OK;
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204 }
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205
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206 /**
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207 * @}
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208 */
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209
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210 /** @addtogroup IWDG_Exported_Functions_Group2
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211 * @brief IO operation functions
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212 *
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213 @verbatim
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214 ===============================================================================
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215 ##### IO operation functions #####
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216 ===============================================================================
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217 [..] This section provides functions allowing to:
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218 (+) Refresh the IWDG.
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219
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220 @endverbatim
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221 * @{
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222 */
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223
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224 /**
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225 * @brief Refresh the IWDG.
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226 * @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
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227 * the configuration information for the specified IWDG module.
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228 * @retval HAL status
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229 */
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230 HAL_StatusTypeDef HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg)
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231 {
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232 /* Reload IWDG counter with value defined in the reload register */
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233 __HAL_IWDG_RELOAD_COUNTER(hiwdg);
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234
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235 /* Return function status */
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236 return HAL_OK;
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237 }
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238
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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 /**
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244 * @}
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245 */
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246
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247 #endif /* HAL_IWDG_MODULE_ENABLED */
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248 /**
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249 * @}
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250 */
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251
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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 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/