Diff: targets/cmsis/TARGET_STM/TARGET_STM32L0/stm32l0xx_hal_iwdg.c

Revision:

382:ee426a420dbb

Parent:

376:cb4d9db17537

Child:

387:643a59b3dbac

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32L0/stm32l0xx_hal_iwdg.c	Mon Nov 03 10:45:07 2014 +0000
@@ -0,0 +1,410 @@
+/**
+  ******************************************************************************
+  * @file    stm32l0xx_hal_iwdg.c
+  * @author  MCD Application Team
+  * @version V1.1.0
+  * @date    18-June-2014
+  * @brief   IWDG HAL module driver.
+  *          This file provides firmware functions to manage the following 
+  *          functionalities of the Independent Watchdog (IWDG) peripheral:
+  *           + Initialization and de-initialization functions
+  *           + IO operation functions
+  *           + Peripheral State functions
+  *         
+  @verbatim
+  ==============================================================================
+                    ##### IWDG Generic features #####
+  ==============================================================================
+    [..] 
+    (+) The IWDG can be started by either software or hardware (configurable
+         through option byte).
+
+    (+) The IWDG is clocked by its own dedicated Low-Speed clock (LSI) and
+         thus stays active even if the main clock fails.
+         Once the IWDG is started, the LSI is forced ON and cannot be disabled
+         (LSI cannot be disabled too), and the counter starts counting down from
+         the reset value of 0xFFF. When it reaches the end of count value (0x000)
+         a system reset is generated.
+
+    (+) The IWDG counter should be refreshed at regular intervals, otherwise the
+         watchdog generates an MCU reset when the counter reaches 0.
+
+    (+) The IWDG is implemented in the VDD voltage domain that is still functional
+         in STOP and STANDBY mode (IWDG reset can wake-up from STANDBY).
+         IWDGRST flag in RCC_CSR register can be used to inform when an IWDG
+         reset occurs.
+
+    [..] Min-max timeout value @32KHz (LSI): ~0.512ms / ~32.0s
+         The IWDG timeout may vary due to LSI frequency dispersion. STM32L0xx
+         devices provide the capability to measure the LSI frequency (LSI clock
+         connected internally to TIM5 CH4 input capture). The measured value
+         can be used to have an IWDG timeout with an acceptable accuracy.
+
+
+                     ##### How to use this driver #####
+  ==============================================================================
+    [..]
+    If Window option is disabled
+    
+      (+) Use IWDG using HAL_IWDG_Init() function to :
+         (++) Enable write access to IWDG_PR, IWDG_RLR.
+         (++) Configure the IWDG prescaler, counter reload value.
+              This reload value will be loaded in the IWDG counter each time the counter
+              is reloaded, then the IWDG will start counting down from this value.
+      (+) Use IWDG using HAL_IWDG_Start() function to :
+         (++) Reload IWDG counter with value defined in the IWDG_RLR register.
+         (++) Start the IWDG, when the IWDG is used in software mode (no need 
+              to enable the LSI, it will be enabled by hardware).
+      (+) Then the application program must refresh the IWDG counter at regular
+          intervals during normal operation to prevent an MCU reset, using
+          HAL_IWDG_Refresh() function.
+    [..] 
+    if Window option is enabled:
+      
+      (+) Use IWDG using HAL_IWDG_Start() function to enable IWDG downcounter
+      (+) Use IWDG using HAL_IWDG_Init() function to :
+         (++) Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers.
+         (++) Configure the IWDG prescaler, reload value and window value.
+      (+) Then the application program must refresh the IWDG counter at regular
+          intervals during normal operation to prevent an MCU reset, using
+          HAL_IWDG_Refresh() function.
+
+     *** IWDG HAL driver macros list ***
+     ====================================
+     [..]
+       Below the list of most used macros in IWDG HAL driver.
+       
+      (+) __HAL_IWDG_START: Enable the IWDG peripheral
+      (+) __HAL_IWDG_RELOAD_COUNTER: Reloads IWDG counter with value defined in the reload register    
+      (+) __HAL_IWDG_ENABLE_WRITE_ACCESS : Enable write access to IWDG_PR and IWDG_RLR registers
+      (+) __HAL_IWDG_DISABLE_WRITE_ACCESS : Disable write access to IWDG_PR and IWDG_RLR registers
+      (+) __HAL_IWDG_GET_FLAG: Get the selected IWDG's flag status    
+            
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32l0xx_hal.h"
+
+/** @addtogroup STM32L0xx_HAL_Driver
+  * @{
+  */
+
+/** @defgroup IWDG
+  * @brief IWDG HAL module driver.
+  * @{
+  */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup IWDG_Private_Functions
+  * @{
+  */
+
+/** @defgroup IWDG_Group1 Initialization and de-initialization functions 
+ *  @brief    Initialization and Configuration functions.
+ *
+@verbatim
+ ===============================================================================
+          ##### Initialization and de-initialization functions #####
+ ===============================================================================
+    [..]  This section provides functions allowing to:
+      (+) Initialize the IWDG according to the specified parameters
+          in the IWDG_InitTypeDef and create the associated handle
+      (+) Manage Window option
+      (+) Initialize the IWDG MSP
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Initializes the IWDG according to the specified
+  *         parameters in the IWDG_InitTypeDef and creates the associated handle.
+  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
+  *                the configuration information for the specified IWDG module.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg)
+{
+  uint32_t tickstart = 0;
+
+  /* Check the IWDG handle allocation */
+  if(hiwdg == NULL)
+  {
+    return HAL_ERROR;
+  }
+
+  /* Check the parameters */
+  assert_param(IS_IWDG_PRESCALER(hiwdg->Init.Prescaler));
+  assert_param(IS_IWDG_RELOAD(hiwdg->Init.Reload));
+  assert_param(IS_IWDG_WINDOW(hiwdg->Init.Window));
+
+  /* Check pending flag, if previous update not done, return error */
+  if((__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_PVU) != RESET)
+     &&(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_RVU) != RESET)
+     &&(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_WVU) != RESET))
+  {
+    return HAL_ERROR;
+  }
+
+  if(hiwdg->State == HAL_IWDG_STATE_RESET)
+  { 
+  /* Init the low level hardware */
+  HAL_IWDG_MspInit(hiwdg);
+  }
+
+  /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_BUSY;
+
+  /* Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers */
+  /* by writing 0x5555 in KR */
+  __HAL_IWDG_ENABLE_WRITE_ACCESS(hiwdg);
+
+  /* Write to IWDG registers the IWDG_Prescaler & IWDG_Reload values to work with */
+  MODIFY_REG(hiwdg->Instance->PR, (uint32_t)IWDG_PR_PR, hiwdg->Init.Prescaler);
+  MODIFY_REG(hiwdg->Instance->RLR, (uint32_t)IWDG_RLR_RL, hiwdg->Init.Reload);
+
+  /* check if window option is enabled */
+  if (((hiwdg->Init.Window) != IWDG_WINDOW_DISABLE) || ((hiwdg->Instance->WINR) != IWDG_WINDOW_DISABLE))
+  {
+    tickstart = HAL_GetTick();
+
+     /* Wait for register to be updated */
+    while((uint32_t)(hiwdg->Instance->SR) != RESET)
+    {
+      if((HAL_GetTick() - tickstart ) > 1000)
+      {
+        /* Set IWDG state */
+        hiwdg->State = HAL_IWDG_STATE_TIMEOUT;
+        return HAL_TIMEOUT;
+      }
+    }
+
+    /* Write to IWDG WINR the IWDG_Window value to compare with */
+    MODIFY_REG(hiwdg->Instance->WINR, (uint32_t)IWDG_WINR_WIN, hiwdg->Init.Window);
+
+  }
+  /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_READY;
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Initializes the IWDG MSP.
+  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
+  *                the configuration information for the specified IWDG module.
+  * @retval None
+  */
+__weak void HAL_IWDG_MspInit(IWDG_HandleTypeDef *hiwdg)
+{
+  /* NOTE : This function Should not be modified, when the callback is needed,
+            the HAL_IWDG_MspInit could be implemented in the user file
+   */
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup IWDG_Group2 IO operation functions  
+ *  @brief   IO operation functions  
+ *
+@verbatim
+ ===============================================================================
+                      ##### IO operation functions #####
+ ===============================================================================
+    [..]  This section provides functions allowing to:
+      (+) Start the IWDG.
+      (+) Refresh the IWDG.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Starts the IWDG.
+  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
+  *                the configuration information for the specified IWDG module.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_IWDG_Start(IWDG_HandleTypeDef *hiwdg)
+{
+  uint32_t tickstart = 0;
+
+  /* Process locked */
+  __HAL_LOCK(hiwdg); 
+
+    /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_BUSY;
+
+  /* Reload IWDG counter with value defined in the RLR register */
+  if ((hiwdg->Init.Window) == IWDG_WINDOW_DISABLE)
+  {
+  __HAL_IWDG_RELOAD_COUNTER(hiwdg);
+  }
+
+  /* Enable the IWDG peripheral */
+  __HAL_IWDG_START(hiwdg);
+
+  tickstart = HAL_GetTick();
+
+  /* Wait until PVU, RVU, WVU flag are RESET */
+  while( (__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_PVU) != RESET)
+        &&(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_RVU) != RESET)
+          &&(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_WVU) != RESET) )
+  {
+    
+    if((HAL_GetTick() - tickstart ) > 1000)
+    {
+      /* Set IWDG state */
+      hiwdg->State = HAL_IWDG_STATE_TIMEOUT;
+      
+      /* Process unlocked */
+      __HAL_UNLOCK(hiwdg);
+      
+      return HAL_TIMEOUT;
+    }
+  }
+
+  /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_READY;
+
+  /* Process Unlocked */
+  __HAL_UNLOCK(hiwdg);
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Refreshes the IWDG.
+  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
+  *                the configuration information for the specified IWDG module.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg)
+{
+  uint32_t tickstart = 0;
+
+  /* Process Locked */
+  __HAL_LOCK(hiwdg);
+
+    /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_BUSY;
+
+  tickstart = HAL_GetTick();
+
+  /* Wait until RVU flag is RESET */
+  while(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_RVU) != RESET)
+  {
+    if((HAL_GetTick() - tickstart ) > 1000)
+    {
+      /* Set IWDG state */
+      hiwdg->State = HAL_IWDG_STATE_TIMEOUT;
+
+       /* Process unlocked */
+      __HAL_UNLOCK(hiwdg);
+
+      return HAL_TIMEOUT;
+    }
+  }
+
+  /* Reload IWDG counter with value defined in the reload register */
+  __HAL_IWDG_RELOAD_COUNTER(hiwdg);
+
+  /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_READY;
+
+  /* Process Unlocked */
+  __HAL_UNLOCK(hiwdg);
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup IWDG_Group3 Peripheral State functions 
+ *  @brief    Peripheral State functions.
+ *
+@verbatim
+ ===============================================================================
+                      ##### Peripheral State functions #####
+ ===============================================================================
+    [..]
+    This subsection permits to get in run-time the status of the peripheral
+    and the data flow.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Returns the IWDG state.
+  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
+  *                the configuration information for the specified IWDG module.
+  * @retval HAL state
+  */
+HAL_IWDG_StateTypeDef HAL_IWDG_GetState(IWDG_HandleTypeDef *hiwdg)
+{
+  return hiwdg->State;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* HAL_IWDG_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/