Diff: targets/cmsis/TARGET_STM/TARGET_STM32F0/stm32f0xx_hal_iwdg.c

Revision:

392:2b59412bb664

Parent:

340:28d1f895c6fe

Child:

441:d2c15dda23c1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32F0/stm32f0xx_hal_iwdg.c	Fri Nov 07 08:15:08 2014 +0000
@@ -0,0 +1,416 @@
+/**
+  ******************************************************************************
+  * @file    stm32f0xx_hal_iwdg.c
+  * @author  MCD Application Team
+  * @version V1.1.0
+  * @date    03-Oct-2014
+  * @brief   IWDG HAL module driver.
+  *          This file provides firmware functions to manage the following 
+  *          functionalities of the IWDG peripheral:
+  *           + Initialization and Configuration functions
+  *           + IO operation functions
+  *           + Peripheral State functions
+  *         
+  @verbatim
+ ===============================================================================
+                        ##### IWDG Specific 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 @41KHz (LSI): ~0.1ms / ~25.5s
+          The IWDG timeout may vary due to LSI frequency dispersion. STM32F0x
+          devices provide the capability to measure the LSI frequency (LSI clock
+          connected internally to TIM16 CH1 input capture). The measured value
+          can be used to have an IWDG timeout with an acceptable accuracy.
+          For more information, please refer to the STM32F0x Reference manual.
+
+ ===============================================================================
+                        ##### 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 "stm32f0xx_hal.h"
+
+/** @addtogroup STM32F0xx_HAL_Driver
+  * @{
+  */
+
+/** @defgroup IWDG IWDG HAL module driver
+  * @brief IWDG HAL module driver.
+  * @{
+  */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+
+/** @defgroup IWDG_Private_Defines IWDG Private Defines
+  * @{
+  */
+
+#define HAL_IWDG_DEFAULT_TIMEOUT (uint32_t)1000
+
+/**
+  * @}
+  */
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup IWDG_Exported_Functions IWDG Exported Functions
+  * @{
+  */
+
+/** @defgroup IWDG_Exported_Functions_Group1 Initialization and de-initialization functions 
+ *  @brief    Initialization and Configuration functions. 
+ *
+@verbatim    
+ ===============================================================================
+              ##### 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
+      (+) DeInitialize 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 == HAL_NULL)
+  {
+    return HAL_ERROR;
+  }
+  
+  /* Check the parameters */
+  assert_param(IS_IWDG_ALL_INSTANCE(hiwdg->Instance));
+  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, IWDG_PR_PR, hiwdg->Init.Prescaler);
+  MODIFY_REG(hiwdg->Instance->RLR, 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) > HAL_IWDG_DEFAULT_TIMEOUT)
+      { 
+        /* 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, 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_Exported_Functions_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) > HAL_IWDG_DEFAULT_TIMEOUT)
+    { 
+      /* 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) > HAL_IWDG_DEFAULT_TIMEOUT)
+    { 
+      /* 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_Exported_Functions_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****/