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278 lines
8.6 KiB
C
278 lines
8.6 KiB
C
/******************** (C) COPYRIGHT 2006 STMicroelectronics ********************
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* File Name : 91x_wdg.c
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* Author : MCD Application Team
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* Date First Issued : 05/18/2006 : Version 1.0
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* Description : This file provides all the WDG software functions.
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********************************************************************************
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* History:
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* 05/24/2006 : Version 1.1
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* 05/18/2006 : Version 1.0
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********************************************************************************
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* THE PRESENT SOFTWARE 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 TIME.
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* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
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* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
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* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
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* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*******************************************************************************/
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/* Includes ------------------------------------------------------------------*/
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#include "91x_wdg.h"
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#include "91x_scu.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* WDG End of Count interrupt Flag */
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#define WDG_FLAG_EC 0x0001
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/* WDG End of Count interrupt request */
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#define WDG_IT_EC 0x0001
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/* WDG Start/Stop counter */
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#define WDG_Counter_Start 0x0002
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#define WDG_Counter_Stop 0xFFFD
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Registers reset value */
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/******************************************************************************
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* Function Name : WDG_DeInit
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* Description : Deinitializes the WDG peripheral registers to their default
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* reset values.
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* Input : None
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* Output : None
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* Return : None
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*******************************************************************************/
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void WDG_DeInit(void)
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{
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SCU_APBPeriphReset(__WDG, ENABLE); /*WDG peripheral under Reset */
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SCU_APBPeriphReset(__WDG, DISABLE); /*WDG peripheral Reset off*/
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}
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/*******************************************************************************
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* Function Name : WDG_StructInit
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* Description : Fills the WDG_InitTypeDef structure member with its reset
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* value.
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* Input : WDG_InitStruct : pointer to a WDG_InitTypeDef structure
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* which will be initialized.
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* Output : None
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* Return : None
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*******************************************************************************/
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void WDG_StructInit(WDG_InitTypeDef *WDG_InitStruct)
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{
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/* Select the Watchdog running mode*/
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WDG_InitStruct->WDG_Mode = WDG_Mode_Timer;
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/* Select the source clock */
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WDG_InitStruct-> WDG_ClockSource = WDG_ClockSource_Apb;
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/* Initialize Prescaler */
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WDG_InitStruct->WDG_Prescaler =0xFF;
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/* Initialize Preload */
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WDG_InitStruct->WDG_Preload =0xFFFF;
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}
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/*******************************************************************************
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* Function Name : WDG_Init
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* Description : Initializes WDG peripheral according to the specified
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* parameters in the WDG_InitStruct.
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* Input : WDG_InitStruct: pointer to a WDG_InitTypeDef structure that
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* contains the configuration information for the WDG peripheral.
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* Output : None
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* Return : None
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*******************************************************************************/
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void WDG_Init(WDG_InitTypeDef* WDG_InitStruct)
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{
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if(WDG_InitStruct->WDG_ClockSource == WDG_ClockSource_Apb)
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{
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/* Select The APB clock as clock source */
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WDG->CR &= WDG_ClockSource_Apb;
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}
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else
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{
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/* Select the RTC clock as source */
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WDG->CR |= WDG_ClockSource_Rtc ;
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}
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/* Configure WDG Prescaler register value */
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WDG->PR = WDG_InitStruct->WDG_Prescaler;
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/* Configure WDG Pre-load register value */
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WDG->VR = WDG_InitStruct->WDG_Preload ;
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if(WDG_InitStruct->WDG_Mode == WDG_Mode_Timer)
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{
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/* Select Timer mode */
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WDG->CR &= WDG_Mode_Timer;
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}
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else
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{
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/* Select WDG mode */
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WDG->CR |= WDG_Mode_Wdg ;
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}
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}
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/*******************************************************************************
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* Function Name : WDG_Cmd
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* Description : Enables or disables the WDG peripheral.
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* Input : NewState: new state of the WDG peripheral (Newstate can be
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* ENABLE or DISABLE)
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* Output : None
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* Return : None
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*******************************************************************************/
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void WDG_Cmd(FunctionalState NewState )
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{
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if((WDG->CR & WDG_Mode_Wdg) == 0)
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{
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/* Timer mode */
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if(NewState == ENABLE)
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{
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/* Start timer by setting SC bit in Control register */
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WDG->CR |= WDG_Counter_Start;
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}
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else
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{
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/* Stop timer by clearning SC bit in Control register */
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WDG->CR &= WDG_Counter_Stop;
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}
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}
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else
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{
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/* Watchdog mode */
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if(NewState == ENABLE)
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{
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WDG->KR = WDG_KeyValue1;
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WDG->KR = WDG_KeyValue2;
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}
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}
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}
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/*******************************************************************************
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* Function Name : WDG_ITConfig
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* Description : Enables or disables the WDG End of Count(EC) interrupt.
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* Input : Newstate: new state of the End of Count(EC) WDG interrupt.
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* This parameter can be: ENABLE or DISABLE.
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* Output : None
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* Return : None
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*******************************************************************************/
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void WDG_ITConfig(FunctionalState NewState)
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{
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if(NewState == ENABLE)
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{
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/* Enable the End of Count interrupt */
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WDG->MR |= WDG_IT_EC;
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}
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else
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{
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/* Disable the End of Count interrupt */
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WDG->MR &= ~WDG_IT_EC;
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}
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}
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/*******************************************************************************
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* Function Name : WDG_GetCounter
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* Description : Gets the WDG<44>s current counter value.
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* Input : None
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* Output : None
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* Return : The WDG current counter value
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*******************************************************************************/
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u16 WDG_GetCounter(void)
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{
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return WDG->CNT;
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}
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/*******************************************************************************
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* Function Name : WDG_GetITStatus
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* Description : Checks whether the WDG End of Count(EC) interrupt is occured or not.
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* Input : None
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* Output : None
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* Return : The new state of WDG_IT (SET or RESET).
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*******************************************************************************/
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ITStatus WDG_GetITStatus(void)
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{
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if(((WDG->SR & WDG_IT_EC) != RESET )&&((WDG->MR & WDG_IT_EC) != RESET ))
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{
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return SET;
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}
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else
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{
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return RESET;
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}
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}
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/*******************************************************************************
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* Function Name : WDG_ClearITPendingBit
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* Description : Clears the WDG's End of Count(EC) interrupt pending bit.
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* Input : None
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* Output : None
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* Return : None
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*******************************************************************************/
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void WDG_ClearITPendingBit(void)
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{
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/* Clear the EC pending bit */
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WDG->SR &= ~WDG_IT_EC;
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}
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/*******************************************************************************
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* Function Name : WDG_ClearFlag
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* Description : Clears the WDG's End of Count(EC) Flag.
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* Input : None
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* Output : None
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* Return : None
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*******************************************************************************/
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void WDG_ClearFlag(void)
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{
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/* Clear the EC Flag */
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WDG->SR &= ~WDG_FLAG_EC;
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}
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/*******************************************************************************
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* Function Name : WDG_GetFlagStatus
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* Description : Checks whether the WDG End of Count(EC) flag is set or not.
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* Input : None
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* Output : None
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* Return : The new state of the WDG_FLAG (SET or RESET).
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*******************************************************************************/
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FlagStatus WDG_GetFlagStatus(void)
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{
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if((WDG->SR & WDG_FLAG_EC) != RESET )
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{
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return SET;
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}
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else
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{
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return RESET;
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}
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}
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/******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/
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