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| 483170 | 1 | /** |
| Q | 2 | ****************************************************************************** |
| 3 | * @file stm32f0xx_hal_wwdg.c | |
| 4 | * @author MCD Application Team | |
| 5 | * @brief WWDG HAL module driver. | |
| 6 | * This file provides firmware functions to manage the following | |
| 7 | * functionalities of the Window Watchdog (WWDG) peripheral: | |
| 8 | * + Initialization and Configuration function | |
| 9 | * + IO operation functions | |
| 10 | @verbatim | |
| 11 | ============================================================================== | |
| 12 | ##### WWDG specific features ##### | |
| 13 | ============================================================================== | |
| 14 | [..] | |
| 15 | Once enabled the WWDG generates a system reset on expiry of a programmed | |
| 16 | time period, unless the program refreshes the counter (T[6;0] downcounter) | |
| 17 | before reaching 0x3F value (i.e. a reset is generated when the counter | |
| 18 | value rolls over from 0x40 to 0x3F). | |
| 19 | ||
| 20 | (+) An MCU reset is also generated if the counter value is refreshed | |
| 21 | before the counter has reached the refresh window value. This | |
| 22 | implies that the counter must be refreshed in a limited window. | |
| 23 | ||
| 24 | (+) Once enabled the WWDG cannot be disabled except by a system reset. | |
| 25 | ||
| 26 | (+) WWDGRST flag in RCC_CSR register informs when a WWDG reset has | |
| 27 | occurred (check available with __HAL_RCC_GET_FLAG(RCC_FLAG_WWDGRST)). | |
| 28 | ||
| 29 | (+) The WWDG downcounter input clock is derived from the APB clock divided | |
| 30 | by a programmable prescaler. | |
| 31 | ||
| 32 | (+) WWDG downcounter clock (Hz) = PCLK / (4096 * Prescaler) | |
| 33 | ||
| 34 | (+) WWDG timeout (ms) = (1000 * (T[5;0] + 1)) / (WWDG downcounter clock) | |
| 35 | where T[5;0] are the lowest 6 bits of downcounter. | |
| 36 | ||
| 37 | (+) WWDG Counter refresh is allowed between the following limits : | |
| 38 | (++) min time (ms) = (1000 * (T[5;0] - Window)) / (WWDG downcounter clock) | |
| 39 | (++) max time (ms) = (1000 * (T[5;0] - 0x40)) / (WWDG downcounter clock) | |
| 40 | ||
| 41 | (+) Min-max timeout value @48 MHz(PCLK): ~85,3us / ~5,46 ms | |
| 42 | ||
| 43 | (+) The Early Wakeup Interrupt (EWI) can be used if specific safety | |
| 44 | operations or data logging must be performed before the actual reset is | |
| 45 | generated. When the downcounter reaches the value 0x40, an EWI interrupt | |
| 46 | is generated and the corresponding interrupt service routine (ISR) can | |
| 47 | be used to trigger specific actions (such as communications or data | |
| 48 | logging), before resetting the device. | |
| 49 | In some applications, the EWI interrupt can be used to manage a software | |
| 50 | system check and/or system recovery/graceful degradation, without | |
| 51 | generating a WWDG reset. In this case, the corresponding interrupt | |
| 52 | service routine (ISR) should reload the WWDG counter to avoid the WWDG | |
| 53 | reset, then trigger the required actions. | |
| 54 | Note:When the EWI interrupt cannot be served, e.g. due to a system lock | |
| 55 | in a higher priority task, the WWDG reset will eventually be generated. | |
| 56 | ||
| 57 | (+) Debug mode : When the microcontroller enters debug mode (core halted), | |
| 58 | the WWDG counter either continues to work normally or stops, depending | |
| 59 | on DBG_WWDG_STOP configuration bit in DBG module, accessible through | |
| 60 | __HAL_DBGMCU_FREEZE_WWDG() and __HAL_DBGMCU_UNFREEZE_WWDG() macros | |
| 61 | ||
| 62 | ##### How to use this driver ##### | |
| 63 | ============================================================================== | |
| 64 | [..] | |
| 65 | (+) Enable WWDG APB1 clock using __HAL_RCC_WWDG_CLK_ENABLE(). | |
| 66 | ||
| 67 | (+) Set the WWDG prescaler, refresh window, counter value and Early Wakeup | |
| 68 | Interrupt mode using using HAL_WWDG_Init() function. | |
| 69 | This enables WWDG peripheral and the downcounter starts downcounting | |
| 70 | from given counter value. | |
| 71 | Init function can be called again to modify all watchdog parameters, | |
| 72 | however if EWI mode has been set once, it can't be clear until next | |
| 73 | reset. | |
| 74 | ||
| 75 | (+) The application program must refresh the WWDG counter at regular | |
| 76 | intervals during normal operation to prevent an MCU reset using | |
| 77 | HAL_WWDG_Refresh() function. This operation must occur only when | |
| 78 | the counter is lower than the window value already programmed. | |
| 79 | ||
| 80 | (+) if Early Wakeup Interrupt mode is enable an interrupt is generated when | |
| 81 | the counter reaches 0x40. User can add his own code in weak function | |
| 82 | HAL_WWDG_EarlyWakeupCallback(). | |
| 83 | ||
| 84 | *** WWDG HAL driver macros list *** | |
| 85 | ================================== | |
| 86 | [..] | |
| 87 | Below the list of most used macros in WWDG HAL driver. | |
| 88 | ||
| 89 | (+) __HAL_WWDG_GET_IT_SOURCE: Check the selected WWDG's interrupt source. | |
| 90 | (+) __HAL_WWDG_GET_FLAG: Get the selected WWDG's flag status. | |
| 91 | (+) __HAL_WWDG_CLEAR_FLAG: Clear the WWDG's pending flags. | |
| 92 | ||
| 93 | @endverbatim | |
| 94 | ****************************************************************************** | |
| 95 | * @attention | |
| 96 | * | |
| 97 | * <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2> | |
| 98 | * | |
| 99 | * Redistribution and use in source and binary forms, with or without modification, | |
| 100 | * are permitted provided that the following conditions are met: | |
| 101 | * 1. Redistributions of source code must retain the above copyright notice, | |
| 102 | * this list of conditions and the following disclaimer. | |
| 103 | * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 104 | * this list of conditions and the following disclaimer in the documentation | |
| 105 | * and/or other materials provided with the distribution. | |
| 106 | * 3. Neither the name of STMicroelectronics nor the names of its contributors | |
| 107 | * may be used to endorse or promote products derived from this software | |
| 108 | * without specific prior written permission. | |
| 109 | * | |
| 110 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 111 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 112 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 113 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
| 114 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 115 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 116 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| 117 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| 118 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 119 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 120 | * | |
| 121 | ****************************************************************************** | |
| 122 | */ | |
| 123 | ||
| 124 | /* Includes ------------------------------------------------------------------*/ | |
| 125 | #include "stm32f0xx_hal.h" | |
| 126 | ||
| 127 | /** @addtogroup STM32F0xx_HAL_Driver | |
| 128 | * @{ | |
| 129 | */ | |
| 130 | ||
| 131 | #ifdef HAL_WWDG_MODULE_ENABLED | |
| 132 | /** @defgroup WWDG WWDG | |
| 133 | * @brief WWDG HAL module driver. | |
| 134 | * @{ | |
| 135 | */ | |
| 136 | ||
| 137 | /* Private typedef -----------------------------------------------------------*/ | |
| 138 | /* Private define ------------------------------------------------------------*/ | |
| 139 | /* Private macro -------------------------------------------------------------*/ | |
| 140 | /* Private variables ---------------------------------------------------------*/ | |
| 141 | /* Private function prototypes -----------------------------------------------*/ | |
| 142 | /* Exported functions --------------------------------------------------------*/ | |
| 143 | ||
| 144 | /** @defgroup WWDG_Exported_Functions WWDG Exported Functions | |
| 145 | * @{ | |
| 146 | */ | |
| 147 | ||
| 148 | /** @defgroup WWDG_Exported_Functions_Group1 Initialization and Configuration functions | |
| 149 | * @brief Initialization and Configuration functions. | |
| 150 | * | |
| 151 | @verbatim | |
| 152 | ============================================================================== | |
| 153 | ##### Initialization and Configuration functions ##### | |
| 154 | ============================================================================== | |
| 155 | [..] | |
| 156 | This section provides functions allowing to: | |
| 157 | (+) Initialize and start the WWDG according to the specified parameters | |
| 158 | in the WWDG_InitTypeDef of associated handle. | |
| 159 | (+) Initialize the WWDG MSP. | |
| 160 | ||
| 161 | @endverbatim | |
| 162 | * @{ | |
| 163 | */ | |
| 164 | ||
| 165 | /** | |
| 166 | * @brief Initialize the WWDG according to the specified. | |
| 167 | * parameters in the WWDG_InitTypeDef of associated handle. | |
| 168 | * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains | |
| 169 | * the configuration information for the specified WWDG module. | |
| 170 | * @retval HAL status | |
| 171 | */ | |
| 172 | HAL_StatusTypeDef HAL_WWDG_Init(WWDG_HandleTypeDef *hwwdg) | |
| 173 | { | |
| 174 | /* Check the WWDG handle allocation */ | |
| 175 | if(hwwdg == NULL) | |
| 176 | { | |
| 177 | return HAL_ERROR; | |
| 178 | } | |
| 179 | ||
| 180 | /* Check the parameters */ | |
| 181 | assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance)); | |
| 182 | assert_param(IS_WWDG_PRESCALER(hwwdg->Init.Prescaler)); | |
| 183 | assert_param(IS_WWDG_WINDOW(hwwdg->Init.Window)); | |
| 184 | assert_param(IS_WWDG_COUNTER(hwwdg->Init.Counter)); | |
| 185 | assert_param(IS_WWDG_EWI_MODE(hwwdg->Init.EWIMode)); | |
| 186 | ||
| 187 | /* Init the low level hardware */ | |
| 188 | HAL_WWDG_MspInit(hwwdg); | |
| 189 | ||
| 190 | /* Set WWDG Counter */ | |
| 191 | WRITE_REG(hwwdg->Instance->CR, (WWDG_CR_WDGA | hwwdg->Init.Counter)); | |
| 192 | ||
| 193 | /* Set WWDG Prescaler and Window */ | |
| 194 | WRITE_REG(hwwdg->Instance->CFR, (hwwdg->Init.EWIMode | hwwdg->Init.Prescaler | hwwdg->Init.Window)); | |
| 195 | ||
| 196 | /* Return function status */ | |
| 197 | return HAL_OK; | |
| 198 | } | |
| 199 | ||
| 200 | ||
| 201 | /** | |
| 202 | * @brief Initialize the WWDG MSP. | |
| 203 | * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains | |
| 204 | * the configuration information for the specified WWDG module. | |
| 205 | * @note When rewriting this function in user file, mechanism may be added | |
| 206 | * to avoid multiple initialize when HAL_WWDG_Init function is called | |
| 207 | * again to change parameters. | |
| 208 | * @retval None | |
| 209 | */ | |
| 210 | __weak void HAL_WWDG_MspInit(WWDG_HandleTypeDef *hwwdg) | |
| 211 | { | |
| 212 | /* Prevent unused argument(s) compilation warning */ | |
| 213 | UNUSED(hwwdg); | |
| 214 | ||
| 215 | /* NOTE: This function should not be modified, when the callback is needed, | |
| 216 | the HAL_WWDG_MspInit could be implemented in the user file | |
| 217 | */ | |
| 218 | } | |
| 219 | ||
| 220 | /** | |
| 221 | * @} | |
| 222 | */ | |
| 223 | ||
| 224 | /** @defgroup WWDG_Exported_Functions_Group2 IO operation functions | |
| 225 | * @brief IO operation functions | |
| 226 | * | |
| 227 | @verbatim | |
| 228 | ============================================================================== | |
| 229 | ##### IO operation functions ##### | |
| 230 | ============================================================================== | |
| 231 | [..] | |
| 232 | This section provides functions allowing to: | |
| 233 | (+) Refresh the WWDG. | |
| 234 | (+) Handle WWDG interrupt request and associated function callback. | |
| 235 | ||
| 236 | @endverbatim | |
| 237 | * @{ | |
| 238 | */ | |
| 239 | ||
| 240 | /** | |
| 241 | * @brief Refresh the WWDG. | |
| 242 | * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains | |
| 243 | * the configuration information for the specified WWDG module. | |
| 244 | * @retval HAL status | |
| 245 | */ | |
| 246 | HAL_StatusTypeDef HAL_WWDG_Refresh(WWDG_HandleTypeDef *hwwdg) | |
| 247 | { | |
| 248 | /* Write to WWDG CR the WWDG Counter value to refresh with */ | |
| 249 | WRITE_REG(hwwdg->Instance->CR, (hwwdg->Init.Counter)); | |
| 250 | ||
| 251 | /* Return function status */ | |
| 252 | return HAL_OK; | |
| 253 | } | |
| 254 | ||
| 255 | /** | |
| 256 | * @brief Handle WWDG interrupt request. | |
| 257 | * @note The Early Wakeup Interrupt (EWI) can be used if specific safety operations | |
| 258 | * or data logging must be performed before the actual reset is generated. | |
| 259 | * The EWI interrupt is enabled by calling HAL_WWDG_Init function with | |
| 260 | * EWIMode set to WWDG_EWI_ENABLE. | |
| 261 | * When the downcounter reaches the value 0x40, and EWI interrupt is | |
| 262 | * generated and the corresponding Interrupt Service Routine (ISR) can | |
| 263 | * be used to trigger specific actions (such as communications or data | |
| 264 | * logging), before resetting the device. | |
| 265 | * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains | |
| 266 | * the configuration information for the specified WWDG module. | |
| 267 | * @retval None | |
| 268 | */ | |
| 269 | void HAL_WWDG_IRQHandler(WWDG_HandleTypeDef *hwwdg) | |
| 270 | { | |
| 271 | /* Check if Early Wakeup Interrupt is enable */ | |
| 272 | if(__HAL_WWDG_GET_IT_SOURCE(hwwdg, WWDG_IT_EWI) != RESET) | |
| 273 | { | |
| 274 | /* Check if WWDG Early Wakeup Interrupt occurred */ | |
| 275 | if(__HAL_WWDG_GET_FLAG(hwwdg, WWDG_FLAG_EWIF) != RESET) | |
| 276 | { | |
| 277 | /* Clear the WWDG Early Wakeup flag */ | |
| 278 | __HAL_WWDG_CLEAR_FLAG(hwwdg, WWDG_FLAG_EWIF); | |
| 279 | ||
| 280 | /* Early Wakeup callback */ | |
| 281 | HAL_WWDG_EarlyWakeupCallback(hwwdg); | |
| 282 | } | |
| 283 | } | |
| 284 | } | |
| 285 | ||
| 286 | ||
| 287 | /** | |
| 288 | * @brief WWDG Early Wakeup callback. | |
| 289 | * @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains | |
| 290 | * the configuration information for the specified WWDG module. | |
| 291 | * @retval None | |
| 292 | */ | |
| 293 | __weak void HAL_WWDG_EarlyWakeupCallback(WWDG_HandleTypeDef* hwwdg) | |
| 294 | { | |
| 295 | /* Prevent unused argument(s) compilation warning */ | |
| 296 | UNUSED(hwwdg); | |
| 297 | ||
| 298 | /* NOTE: This function should not be modified, when the callback is needed, | |
| 299 | the HAL_WWDG_EarlyWakeupCallback could be implemented in the user file | |
| 300 | */ | |
| 301 | } | |
| 302 | ||
| 303 | /** | |
| 304 | * @} | |
| 305 | */ | |
| 306 | ||
| 307 | /** | |
| 308 | * @} | |
| 309 | */ | |
| 310 | ||
| 311 | #endif /* HAL_WWDG_MODULE_ENABLED */ | |
| 312 | /** | |
| 313 | * @} | |
| 314 | */ | |
| 315 | ||
| 316 | /** | |
| 317 | * @} | |
| 318 | */ | |
| 319 | ||
| 320 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ | |
