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/**
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******************************************************************************
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* @file stm32f4xx_wwdg.c
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* @author MCD Application Team
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* @version V1.0.0RC1
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* @date 25-August-2011
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* @brief This file provides firmware functions to manage the following
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* functionalities of the Window watchdog (WWDG) peripheral:
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* - Prescaler, Refresh window and Counter configuration
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* - WWDG activation
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* - Interrupts and flags management
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*
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* @verbatim
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*
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* ===================================================================
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* WWDG features
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* ===================================================================
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*
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* Once enabled the WWDG generates a system reset on expiry of a programmed
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* time period, unless the program refreshes the counter (downcounter)
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* before to reach 0x3F value (i.e. a reset is generated when the counter
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* value rolls over from 0x40 to 0x3F).
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* An MCU reset is also generated if the counter value is refreshed
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* before the counter has reached the refresh window value. This
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* implies that the counter must be refreshed in a limited window.
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*
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* Once enabled the WWDG cannot be disabled except by a system reset.
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*
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* WWDGRST flag in RCC_CSR register can be used to inform when a WWDG
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* reset occurs.
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*
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* The WWDG counter input clock is derived from the APB clock divided
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* by a programmable prescaler.
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*
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* WWDG counter clock = PCLK1 / Prescaler
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* WWDG timeout = (WWDG counter clock) * (counter value)
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*
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* Min-max timeout value @30 MHz(PCLK1): ~136.5 us / ~69.9 ms
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*
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* ===================================================================
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* How to use this driver
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* ===================================================================
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* 1. Enable WWDG clock using RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE) function
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*
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* 2. Configure the WWDG prescaler using WWDG_SetPrescaler() function
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*
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* 3. Configure the WWDG refresh window using WWDG_SetWindowValue() function
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*
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* 4. Set the WWDG counter value and start it using WWDG_Enable() function.
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* When the WWDG is enabled the counter value should be configured to
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* a value greater than 0x40 to prevent generating an immediate reset.
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*
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* 5. Optionally you can enable the Early wakeup interrupt which is
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* generated when the counter reach 0x40.
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* Once enabled this interrupt cannot be disabled except by a system reset.
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*
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* 6. Then the application program must refresh the WWDG counter at regular
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* intervals during normal operation to prevent an MCU reset, using
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* WWDG_SetCounter() function. This operation must occur only when
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* the counter value is lower than the refresh window value,
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* programmed using WWDG_SetWindowValue().
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*
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* @endverbatim
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*
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******************************************************************************
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* @attention
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*
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* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f4xx_wwdg.h"
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#include "stm32f4xx_rcc.h"
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/** @addtogroup STM32F4xx_StdPeriph_Driver
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* @{
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*/
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/** @defgroup WWDG
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* @brief WWDG driver modules
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* ----------- WWDG registers bit address in the alias region ----------- */
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#define WWDG_OFFSET (WWDG_BASE - PERIPH_BASE)
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/* Alias word address of EWI bit */
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#define CFR_OFFSET (WWDG_OFFSET + 0x04)
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#define EWI_BitNumber 0x09
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#define CFR_EWI_BB (PERIPH_BB_BASE + (CFR_OFFSET * 32) + (EWI_BitNumber * 4))
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/* --------------------- WWDG registers bit mask ------------------------ */
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/* CFR register bit mask */
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#define CFR_WDGTB_MASK ((uint32_t)0xFFFFFE7F)
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#define CFR_W_MASK ((uint32_t)0xFFFFFF80)
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#define BIT_MASK ((uint8_t)0x7F)
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/** @defgroup WWDG_Private_Functions
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* @{
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*/
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/** @defgroup WWDG_Group1 Prescaler, Refresh window and Counter configuration functions
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* @brief Prescaler, Refresh window and Counter configuration functions
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*
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@verbatim
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===============================================================================
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Prescaler, Refresh window and Counter configuration functions
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===============================================================================
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@endverbatim
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* @{
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*/
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/**
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* @brief Deinitializes the WWDG peripheral registers to their default reset values.
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* @param None
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* @retval None
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*/
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void WWDG_DeInit(void)
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{
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, DISABLE);
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}
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/**
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* @brief Sets the WWDG Prescaler.
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* @param WWDG_Prescaler: specifies the WWDG Prescaler.
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* This parameter can be one of the following values:
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* @arg WWDG_Prescaler_1: WWDG counter clock = (PCLK1/4096)/1
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* @arg WWDG_Prescaler_2: WWDG counter clock = (PCLK1/4096)/2
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* @arg WWDG_Prescaler_4: WWDG counter clock = (PCLK1/4096)/4
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* @arg WWDG_Prescaler_8: WWDG counter clock = (PCLK1/4096)/8
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* @retval None
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*/
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void WWDG_SetPrescaler(uint32_t WWDG_Prescaler)
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{
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uint32_t tmpreg = 0;
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/* Check the parameters */
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assert_param(IS_WWDG_PRESCALER(WWDG_Prescaler));
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/* Clear WDGTB[1:0] bits */
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tmpreg = WWDG->CFR & CFR_WDGTB_MASK;
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/* Set WDGTB[1:0] bits according to WWDG_Prescaler value */
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tmpreg |= WWDG_Prescaler;
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/* Store the new value */
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WWDG->CFR = tmpreg;
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}
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/**
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* @brief Sets the WWDG window value.
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* @param WindowValue: specifies the window value to be compared to the downcounter.
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* This parameter value must be lower than 0x80.
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* @retval None
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*/
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void WWDG_SetWindowValue(uint8_t WindowValue)
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{
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__IO uint32_t tmpreg = 0;
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/* Check the parameters */
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assert_param(IS_WWDG_WINDOW_VALUE(WindowValue));
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/* Clear W[6:0] bits */
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tmpreg = WWDG->CFR & CFR_W_MASK;
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/* Set W[6:0] bits according to WindowValue value */
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tmpreg |= WindowValue & (uint32_t) BIT_MASK;
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/* Store the new value */
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WWDG->CFR = tmpreg;
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}
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/**
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* @brief Enables the WWDG Early Wakeup interrupt(EWI).
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* @note Once enabled this interrupt cannot be disabled except by a system reset.
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* @param None
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* @retval None
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*/
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void WWDG_EnableIT(void)
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{
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*(__IO uint32_t *) CFR_EWI_BB = (uint32_t)ENABLE;
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}
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/**
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* @brief Sets the WWDG counter value.
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* @param Counter: specifies the watchdog counter value.
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* This parameter must be a number between 0x40 and 0x7F (to prevent generating
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* an immediate reset)
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* @retval None
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*/
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void WWDG_SetCounter(uint8_t Counter)
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{
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/* Check the parameters */
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assert_param(IS_WWDG_COUNTER(Counter));
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/* Write to T[6:0] bits to configure the counter value, no need to do
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a read-modify-write; writing a 0 to WDGA bit does nothing */
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WWDG->CR = Counter & BIT_MASK;
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}
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/**
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* @}
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*/
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/** @defgroup WWDG_Group2 WWDG activation functions
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* @brief WWDG activation functions
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*
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@verbatim
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===============================================================================
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WWDG activation function
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===============================================================================
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@endverbatim
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* @{
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*/
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/**
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* @brief Enables WWDG and load the counter value.
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* @param Counter: specifies the watchdog counter value.
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* This parameter must be a number between 0x40 and 0x7F (to prevent generating
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* an immediate reset)
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* @retval None
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*/
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void WWDG_Enable(uint8_t Counter)
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{
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/* Check the parameters */
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assert_param(IS_WWDG_COUNTER(Counter));
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WWDG->CR = WWDG_CR_WDGA | Counter;
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}
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/**
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* @}
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*/
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/** @defgroup WWDG_Group3 Interrupts and flags management functions
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* @brief Interrupts and flags management functions
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*
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@verbatim
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===============================================================================
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Interrupts and flags management functions
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===============================================================================
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@endverbatim
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* @{
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*/
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/**
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* @brief Checks whether the Early Wakeup interrupt flag is set or not.
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* @param None
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* @retval The new state of the Early Wakeup interrupt flag (SET or RESET)
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*/
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FlagStatus WWDG_GetFlagStatus(void)
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{
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FlagStatus bitstatus = RESET;
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if ((WWDG->SR) != (uint32_t)RESET)
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{
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bitstatus = SET;
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}
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else
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{
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bitstatus = RESET;
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}
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return bitstatus;
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}
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/**
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* @brief Clears Early Wakeup interrupt flag.
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* @param None
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* @retval None
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*/
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void WWDG_ClearFlag(void)
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{
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WWDG->SR = (uint32_t)RESET;
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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/**
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* @}
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*/
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/**
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* @}
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*/
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/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
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