tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L1/stm32l1xx_hal_iwdg.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32l1xx_hal_iwdg.c
   4   * @author  MCD Application Team
   5   * @version V1.0.0
   6   * @date    5-September-2014
   7   * @brief   IWDG HAL module driver.
   8   *
   9   *          This file provides firmware functions to manage the following
  10   *          functionalities of the IWDG peripheral:
  11   *           + Initialization and Configuration functions
  12   *           + IO operation functions
  13   *           + Peripheral State functions
  14   *
  15   @verbatim
  16
  17 ================================================================================
  18                     ##### IWDG specific features #####
  19 ================================================================================
  20     [..]
  21     (+) The IWDG can be started by either software or hardware (configurable
  22          through option byte).
  23     (+) The IWDG is clocked by its own dedicated Low-Speed clock (LSI) and
  24          thus stays active even if the main clock fails.
  25       (+) Once the IWDG is started, the LSI is forced ON and cannot be disabled
  26          (LSI cannot be disabled too), and the counter starts counting down from
  27          the reset value of 0xFFF. When it reaches the end of count value (0x000)
  28          a system reset is generated.
  29     (+) The IWDG counter should be refreshed at regular intervals, otherwise the
  30          watchdog generates an MCU reset when the counter reaches 0.
  31     (+) The IWDG is implemented in the VDD voltage domain that is still functional
  32          in STOP and STANDBY mode (IWDG reset can wake-up from STANDBY).
  33       (+) IWDGRST flag in RCC_CSR register can be used to inform when an IWDG
  34          reset occurs.
  35
  36     (+) Min-max timeout value @37KHz (LSI): ~108us / ~28.3s
  37          The IWDG timeout may vary due to LSI frequency dispersion. STM32L1xx
  38          devices provide the capability to measure the LSI frequency (LSI clock
  39          connected internally to TIM10 CH1 input capture). The measured value
  40          can be used to have an IWDG timeout with an acceptable accuracy.
  41          For more information, please refer to the STM32L1xx Reference manual.
  42
  43                      ##### How to use this driver #####
  44   ==============================================================================
  45     [..]
  46       (+) Set the IWDG prescaler and reload value
  47           using HAL_IWDG_Init() function.
  48       (+) Use IWDG using HAL_IWDG_Start() function to:
  49           (++) Enable write access to IWDG_PR and IWDG_RLR registers.
  50           (++) Configure the IWDG prescaler and counter reload values.
  51           (++) Reload IWDG counter with value defined in the IWDG_RLR register.
  52           (++) Start the IWDG, when the IWDG is used in software mode (no need
  53                to enable the LSI, it will be enabled by hardware).
  54       (+) Then the application program must refresh the IWDG counter at regular
  55           intervals during normal operation to prevent an MCU reset, using
  56           HAL_IWDG_Refresh() function.
  57
  58      *** IWDG HAL driver macros list ***
  59      ====================================
  60      [..]
  61        Below the list of most used macros in IWDG HAL driver.
  62
  63       (+) __HAL_IWDG_START: Enable the IWDG peripheral
  64       (+) __HAL_IWDG_RELOAD_COUNTER: Reloads IWDG counter with value defined in the reload register
  65       (+) __HAL_IWDG_ENABLE_WRITE_ACCESS : Enable write access to IWDG_PR and IWDG_RLR registers
  66       (+) __HAL_IWDG_DISABLE_WRITE_ACCESS : Disable write access to IWDG_PR and IWDG_RLR registers
  67       (+) __HAL_IWDG_GET_FLAG: Get the selected IWDG's flag status
  68       (+) __HAL_IWDG_CLEAR_FLAG: Clear the IWDG's pending flags
  69
  70   @endverbatim
  71   ******************************************************************************
  72   * @attention
  73   *
  74   * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
  75   *
  76   * Redistribution and use in source and binary forms, with or without modification,
  77   * are permitted provided that the following conditions are met:
  78   *   1. Redistributions of source code must retain the above copyright notice,
  79   *      this list of conditions and the following disclaimer.
  80   *   2. Redistributions in binary form must reproduce the above copyright notice,
  81   *      this list of conditions and the following disclaimer in the documentation
  82   *      and/or other materials provided with the distribution.
  83   *   3. Neither the name of STMicroelectronics nor the names of its contributors
  84   *      may be used to endorse or promote products derived from this software
  85   *      without specific prior written permission.
  86   *
  87   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  88   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  89   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  90   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  91   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  92   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  93   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  94   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  95   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  96   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  97   *
  98   ******************************************************************************
  99   */
 100
 101 /* Includes ------------------------------------------------------------------*/
 102 #include "stm32l1xx_hal.h"
 103
 104 /** @addtogroup STM32L1xx_HAL_Driver
 105   * @{
 106   */
 107
 108 /** @defgroup IWDG IWDG
 109   * @brief IWDG HAL module driver.
 110   * @{
 111   */
 112
 113 #ifdef HAL_IWDG_MODULE_ENABLED
 114
 115 /* Private typedef -----------------------------------------------------------*/
 116 /* Private define ------------------------------------------------------------*/
 117
 118 /** @defgroup IWDG_Private_Defines IWDG Private Defines
 119   * @{
 120   */
 121
 122 #define HAL_IWDG_DEFAULT_TIMEOUT (uint32_t)1000
 123
 124 /**
 125   * @}
 126   */
 127
 128 /* Private macro -------------------------------------------------------------*/
 129 /* Private variables ---------------------------------------------------------*/
 130 /* Private function prototypes -----------------------------------------------*/
 131 /* Private functions ---------------------------------------------------------*/
 132
 133 /** @defgroup IWDG_Exported_Functions IWDG Exported Functions
 134   * @{
 135   */
 136
 137 /** @defgroup IWDG_Exported_Functions_Group1 Initialization and de-initialization functions
 138  *  @brief    Initialization and Configuration functions.
 139  *
 140 @verbatim
 141  ===============================================================================
 142           ##### Initialization and de-initialization functions #####
 143  ===============================================================================
 144     [..]  This section provides functions allowing to:
 145       (+) Initialize the IWDG according to the specified parameters
 146           in the IWDG_InitTypeDef and create the associated handle
 147       (+) Initialize the IWDG MSP
 148       (+) DeInitialize IWDG MSP
 149
 150 @endverbatim
 151   * @{
 152   */
 153
 154 /**
 155   * @brief  Initializes the IWDG according to the specified
 156   *         parameters in the IWDG_InitTypeDef and creates the associated handle.
 157   * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
 158   *                the configuration information for the specified IWDG module.
 159   * @retval HAL status
 160   */
 161 HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg)
 162 {
 163   /* Check the IWDG handle allocation */
 164   if(hiwdg == HAL_NULL)
 165   {
 166     return HAL_ERROR;
 167   }
 168
 169   /* Check the parameters */
 170   assert_param(IS_IWDG_ALL_INSTANCE(hiwdg->Instance));
 171   assert_param(IS_IWDG_PRESCALER(hiwdg->Init.Prescaler));
 172   assert_param(IS_IWDG_RELOAD(hiwdg->Init.Reload));
 173
 174   /* Check pending flag, if previous update not done, return error */
 175   if((__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_PVU) != RESET)
 176      &&(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_RVU) != RESET))
 177   {
 178     return HAL_ERROR;
 179   }
 180
 181   if(hiwdg->State == HAL_IWDG_STATE_RESET)
 182   {
 183     /* Init the low level hardware */
 184     HAL_IWDG_MspInit(hiwdg);
 185   }
 186
 187   /* Change IWDG peripheral state */
 188   hiwdg->State = HAL_IWDG_STATE_BUSY;
 189
 190   /* Enable write access to IWDG_PR and IWDG_RLR registers */
 191   __HAL_IWDG_ENABLE_WRITE_ACCESS(hiwdg);
 192
 193   /* Write to IWDG registers the IWDG_Prescaler & IWDG_Reload values to work with */
 194   MODIFY_REG(hiwdg->Instance->PR, IWDG_PR_PR, hiwdg->Init.Prescaler);
 195   MODIFY_REG(hiwdg->Instance->RLR, IWDG_RLR_RL, hiwdg->Init.Reload);
 196
 197   /* Change IWDG peripheral state */
 198   hiwdg->State = HAL_IWDG_STATE_READY;
 199
 200   /* Return function status */
 201   return HAL_OK;
 202 }
 203
 204 /**
 205   * @brief  Initializes the IWDG MSP.
 206   * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
 207   *                the configuration information for the specified IWDG module.
 208   * @retval None
 209   */
 210 __weak void HAL_IWDG_MspInit(IWDG_HandleTypeDef *hiwdg)
 211 {
 212   /* NOTE : This function Should not be modified, when the callback is needed,
 213             the HAL_IWDG_MspInit could be implemented in the user file
 214    */
 215 }
 216
 217 /**
 218   * @}
 219   */
 220
 221 /** @defgroup IWDG_Exported_Functions_Group2 IO operation functions
 222  *  @brief   IO operation functions
 223  *
 224 @verbatim
 225  ===============================================================================
 226                       ##### IO operation functions #####
 227  ===============================================================================
 228     [..]  This section provides functions allowing to:
 229       (+) Start the IWDG.
 230       (+) Refresh the IWDG.
 231
 232 @endverbatim
 233   * @{
 234   */
 235
 236 /**
 237   * @brief  Starts the IWDG.
 238   * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
 239   *                the configuration information for the specified IWDG module.
 240   * @retval HAL status
 241   */
 242 HAL_StatusTypeDef HAL_IWDG_Start(IWDG_HandleTypeDef *hiwdg)
 243 {
 244   /* Process Locked */
 245   __HAL_LOCK(hiwdg);
 246
 247     /* Change IWDG peripheral state */
 248   hiwdg->State = HAL_IWDG_STATE_BUSY;
 249
 250   /* Start the IWDG peripheral */
 251   __HAL_IWDG_START(hiwdg);
 252
 253     /* Reload IWDG counter with value defined in the RLR register */
 254   __HAL_IWDG_RELOAD_COUNTER(hiwdg);
 255
 256   /* Change IWDG peripheral state */
 257   hiwdg->State = HAL_IWDG_STATE_READY;
 258
 259   /* Process Unlocked */
 260   __HAL_UNLOCK(hiwdg);
 261
 262   /* Return function status */
 263   return HAL_OK;
 264 }
 265
 266 /**
 267   * @brief  Refreshes the IWDG.
 268   * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
 269   *                the configuration information for the specified IWDG module.
 270   * @retval HAL status
 271   */
 272 HAL_StatusTypeDef HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg)
 273 {
 274   uint32_t tickstart = 0;
 275
 276   /* Process Locked */
 277   __HAL_LOCK(hiwdg);
 278
 279     /* Change IWDG peripheral state */
 280   hiwdg->State = HAL_IWDG_STATE_BUSY;
 281
 282   tickstart = HAL_GetTick();
 283
 284   /* Wait until RVU flag is RESET */
 285   while(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_RVU) != RESET)
 286   {
 287     if((HAL_GetTick() - tickstart ) > HAL_IWDG_DEFAULT_TIMEOUT)
 288     {
 289       /* Set IWDG state */
 290       hiwdg->State = HAL_IWDG_STATE_TIMEOUT;
 291
 292        /* Process unlocked */
 293       __HAL_UNLOCK(hiwdg);
 294
 295       return HAL_TIMEOUT;
 296     }
 297   }
 298
 299   /* Reload IWDG counter with value defined in the reload register */
 300   __HAL_IWDG_RELOAD_COUNTER(hiwdg);
 301
 302   /* Change IWDG peripheral state */
 303   hiwdg->State = HAL_IWDG_STATE_READY;
 304
 305   /* Process Unlocked */
 306   __HAL_UNLOCK(hiwdg);
 307
 308   /* Return function status */
 309   return HAL_OK;
 310 }
 311
 312 /**
 313   * @}
 314   */
 315
 316 /** @defgroup IWDG_Exported_Functions_Group3 Peripheral State functions
 317  *  @brief    Peripheral State functions.
 318  *
 319 @verbatim
 320  ===============================================================================
 321                       ##### Peripheral State functions #####
 322  ===============================================================================
 323     [..]
 324     This subsection permits to get in run-time the status of the peripheral
 325     and the data flow.
 326
 327 @endverbatim
 328   * @{
 329   */
 330
 331 /**
 332   * @brief  Returns the IWDG state.
 333   * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
 334   *                the configuration information for the specified IWDG module.
 335   * @retval HAL state
 336   */
 337 HAL_IWDG_StateTypeDef HAL_IWDG_GetState(IWDG_HandleTypeDef *hiwdg)
 338 {
 339   return hiwdg->State;
 340 }
 341
 342 /**
 343   * @}
 344   */
 345
 346 /**
 347   * @}
 348   */
 349
 350 #endif /* HAL_IWDG_MODULE_ENABLED */
 351 /**
 352   * @}
 353   */
 354
 355 /**
 356   * @}
 357   */
 358
 359 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
 360