Diff: targets/cmsis/TARGET_STM/TARGET_DISCO_L053C8/stm32l0xx_hal_wwdg.c

Revision:

376:cb4d9db17537

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_DISCO_L053C8/stm32l0xx_hal_wwdg.c	Fri Oct 31 11:00:10 2014 +0000
@@ -0,0 +1,461 @@
+/**
+  ******************************************************************************
+  * @file    stm32l0xx_hal_wwdg.c
+  * @author  MCD Application Team
+  * @version V1.1.0
+  * @date    18-June-2014
+  * @brief   WWDG HAL module driver.
+  *          This file provides firmware functions to manage the following 
+  *          functionalities of the Window Watchdog (WWDG) peripheral:
+  *           + Initialization and de-initialization functions
+  *           + IO operation functions
+  *           + Peripheral State functions        
+  @verbatim
+  ==============================================================================
+                      ##### WWDG specific features #####
+  ==============================================================================
+  [..] 
+    Once enabled the WWDG generates a system reset on expiry of a programmed
+       time period, unless the program refreshes the counter (downcounter)
+       before reaching 0x3F value (i.e. a reset is generated when the counter
+       value rolls over from 0x40 to 0x3F).
+
+        (+) An MCU reset is also generated if the counter value is refreshed
+            before the counter has reached the refresh window value. This
+            implies that the counter must be refreshed in a limited window.
+        (+) Once enabled the WWDG cannot be disabled except by a system reset.
+        (+) WWDGRST flag in RCC_CSR register can be used to inform when a WWDG
+            reset occurs.               
+        (+) The WWDG counter input clock is derived from the APB clock divided
+            by a programmable prescaler.
+        (+) WWDG counter clock = PCLK1 / Prescaler
+            WWDG timeout = (WWDG counter clock) * (counter value) 
+        (+) Min-max timeout value @32 MHz(PCLK1): ~128.0 us / ~65.54 ms
+
+
+                     ##### How to use this driver #####
+  ==============================================================================
+  [..]
+    (+) Enable WWDG APB1 clock using __WWDG_CLK_ENABLE().
+    (+) Set the WWDG prescaler, refresh window and counter value
+        using HAL_WWDG_Init() function.
+    (+) Start the WWDG using HAL_WWDG_Start() function.
+        When the WWDG is enabled the counter value should be configured to
+        a value greater than 0x40 to prevent generating an immediate reset.
+    (+) Optionally you can enable the Early Wakeup Interrupt (EWI) which is
+        generated when the counter reaches 0x40, and then start the WWDG using
+        HAL_WWDG_Start_IT().
+        Once enabled, EWI interrupt cannot be disabled except by a system reset.
+    (+) Then the application program must refresh the WWDG counter at regular
+        intervals during normal operation to prevent an MCU reset, using
+        HAL_WWDG_Refresh() function. This operation must occur only when
+        the counter is lower than the refresh window value already programmed.
+        
+     *** WWDG HAL driver macros list ***
+     ==================================
+     [..]
+       Below the list of most used macros in WWDG HAL driver.
+       
+      (+) __HAL_WWDG_ENABLE: Enable the WWDG peripheral 
+      (+) __HAL_WWDG_GET_FLAG: Get the selected WWDG's flag status
+      (+) __HAL_WWDG_CLEAR_FLAG: Clear the WWDG's pending flags 
+      (+) __HAL_WWDG_ENABLE_IT:  Enables the WWDG early wakeup interrupt  
+
+  @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 WWDG 
+  * @brief WWDG HAL module driver.
+  * @{
+  */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup WWDG_Private_Functions
+  * @{
+  */
+
+/** @defgroup WWDG_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 WWDG according to the specified parameters
+          in the WWDG_InitTypeDef and create the associated handle
+      (+) DeInitialize the WWDG peripheral
+      (+) Initialize the WWDG MSP
+      (+) DeInitialize the WWDG MSP
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Initializes the WWDG according to the specified
+  *         parameters in the WWDG_InitTypeDef and creates the associated handle.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_WWDG_Init(WWDG_HandleTypeDef *hwwdg)
+{
+  uint32_t tmp = 0;
+
+  /* Check the WWDG handle allocation */
+  if(hwwdg == NULL)
+  {
+    return HAL_ERROR;
+  }
+
+  /* Check the parameters */
+  assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance));
+  assert_param(IS_WWDG_PRESCALER(hwwdg->Init.Prescaler));
+  assert_param(IS_WWDG_WINDOW(hwwdg->Init.Window));
+  assert_param(IS_WWDG_COUNTER(hwwdg->Init.Counter));
+  
+  if(hwwdg->State == HAL_WWDG_STATE_RESET)
+  {
+    /* Init the low level hardware */
+    HAL_WWDG_MspInit(hwwdg);
+  }
+
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_BUSY;
+
+  /* Set WWDG Prescaler and Window */
+  /* Get the CFR register value */
+  tmp = hwwdg->Instance->CFR;
+
+  /* Clear WDGTB[1:0] and W[6:0] bits */
+  tmp &= ((uint32_t)~(WWDG_CFR_WDGTB | WWDG_CFR_W));
+
+  /* Prepare the WWDG Prescaler and Window parameters */
+  tmp |= hwwdg->Init.Prescaler | hwwdg->Init.Window;
+
+  /* Write to WWDG CFR */
+  hwwdg->Instance->CFR = tmp;
+
+  /* Set WWDG Counter */
+  /* Get the CR register value */
+  tmp = hwwdg->Instance->CR;
+
+  /* Clear T[6:0] bits */
+  tmp &= (uint32_t)~((uint32_t)WWDG_CR_T);
+
+  /* Prepare the WWDG Counter parameter */
+  tmp |= (hwwdg->Init.Counter);
+
+  /* Write to WWDG CR */
+  hwwdg->Instance->CR = tmp;  
+
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_READY;
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  DeInitializes the WWDG peripheral.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_WWDG_DeInit(WWDG_HandleTypeDef *hwwdg)
+{
+  /* Check the parameters */
+  assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance));
+
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_BUSY;
+
+  /* DeInit the low level hardware */
+  HAL_WWDG_MspDeInit(hwwdg);
+
+  /* Reset WWDG Control register */
+  hwwdg->Instance->CR  = (uint32_t)0x0000007F;
+
+  /* Reset WWDG Configuration register */
+  hwwdg->Instance->CFR = (uint32_t)0x0000007F;
+
+  /* Reset WWDG Status register */
+  hwwdg->Instance->SR  = 0; 
+
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_RESET;
+  
+  /* Release Lock */
+  __HAL_UNLOCK(hwwdg);
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Initializes the WWDG MSP.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval None
+  */
+__weak void HAL_WWDG_MspInit(WWDG_HandleTypeDef *hwwdg)
+{
+  /* NOTE: This function Should not be modified, when the callback is needed,
+           the HAL_WWDG_MspInit could be implemented in the user file
+   */
+}
+
+/**
+  * @brief  DeInitializes the WWDG MSP.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval None
+  */
+__weak void HAL_WWDG_MspDeInit(WWDG_HandleTypeDef *hwwdg)
+{
+  /* NOTE: This function Should not be modified, when the callback is needed,
+           the HAL_WWDG_MspDeInit could be implemented in the user file
+   */
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup WWDG_Group2 IO operation functions 
+ *  @brief    IO operation functions 
+ *
+@verbatim
+  ==============================================================================
+                      ##### IO operation functions #####
+  ==============================================================================  
+  [..]  
+    This section provides functions allowing to:
+      (+) Start the WWDG.
+      (+) Refresh the WWDG.
+      (+) Handle WWDG interrupt request.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Starts the WWDG.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_WWDG_Start(WWDG_HandleTypeDef *hwwdg)
+{
+  /* Process Locked */
+  __HAL_LOCK(hwwdg); 
+
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_BUSY;
+
+  /* Enable the peripheral */
+  __HAL_WWDG_ENABLE(hwwdg);
+
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_READY;
+
+  /* Process Unlocked */
+  __HAL_UNLOCK(hwwdg);
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Starts the WWDG with interrupt enabled.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_WWDG_Start_IT(WWDG_HandleTypeDef *hwwdg)
+{
+  /* Process Locked */
+  __HAL_LOCK(hwwdg);
+
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_BUSY;
+
+  /* Enable the Early Wakeup Interrupt */
+  __HAL_WWDG_ENABLE_IT(WWDG_IT_EWI);
+
+  /* Enable the peripheral */
+  __HAL_WWDG_ENABLE(hwwdg);
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Refreshes the WWDG.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @param  Counter: value of counter to put in WWDG counter
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_WWDG_Refresh(WWDG_HandleTypeDef *hwwdg, uint32_t Counter)
+{
+  /* Process Locked */
+  __HAL_LOCK(hwwdg);
+
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_BUSY;
+
+  /* Check the parameters */
+  assert_param(IS_WWDG_COUNTER(Counter));
+
+  /* Write to WWDG CR the WWDG Counter value to refresh with */
+  MODIFY_REG(hwwdg->Instance->CR, (uint32_t)WWDG_CR_T, Counter);
+  
+  /* Change WWDG peripheral state */
+  hwwdg->State = HAL_WWDG_STATE_READY;
+
+  /* Process Unlocked */
+  __HAL_UNLOCK(hwwdg);
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Handles WWDG interrupt request.
+  * @note   The Early Wakeup Interrupt (EWI) can be used if specific safety operations
+  *         or data logging must be performed before the actual reset is generated.
+  *         The EWI interrupt is enabled using __HAL_WWDG_ENABLE_IT() macro.
+  *         When the downcounter reaches the value 0x40, and EWI interrupt is
+  *         generated and the corresponding Interrupt Service Routine (ISR) can
+  *         be used to trigger specific actions (such as communications or data
+  *         logging), before resetting the device.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval None
+  */
+void HAL_WWDG_IRQHandler(WWDG_HandleTypeDef *hwwdg)
+{
+  /* WWDG Early Wakeup Interrupt occurred */
+  if(__HAL_WWDG_GET_FLAG(hwwdg, WWDG_FLAG_EWIF) != RESET)
+  {
+    /* Early Wakeup callback */ 
+    HAL_WWDG_WakeupCallback(hwwdg);
+
+    /* Change WWDG peripheral state */
+    hwwdg->State = HAL_WWDG_STATE_READY;
+
+    /* Clear the WWDG Data Ready flag */
+    __HAL_WWDG_CLEAR_IT(hwwdg, WWDG_FLAG_EWIF);
+
+    /* Process Unlocked */
+    __HAL_UNLOCK(hwwdg);
+  }
+}
+
+/**
+  * @brief  Early Wakeup WWDG callback.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval None
+  */
+__weak void HAL_WWDG_WakeupCallback(WWDG_HandleTypeDef* hwwdg)
+{
+  /* NOTE: This function Should not be modified, when the callback is needed,
+           the HAL_WWDG_WakeupCallback could be implemented in the user file
+   */
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup WWDG_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 WWDG state.
+  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains
+  *              the configuration information for the specified WWDG module.
+  * @retval HAL state
+  */
+HAL_WWDG_StateTypeDef HAL_WWDG_GetState(WWDG_HandleTypeDef *hwwdg)
+{
+  return hwwdg->State;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* HAL_WWDG_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/