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| /******************** (C) COPYRIGHT 2008 STMicroelectronics ******************** |
| * File Name : 91x_wdg.c |
| * Author : MCD Application Team |
| * Version : V2.1 |
| * Date : 12/22/2008 |
| * Description : This file provides all the WDG firmware functions. |
| ******************************************************************************** |
| * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS |
| * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. |
| * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, |
| * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE |
| * CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING |
| * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. |
| *******************************************************************************/ |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "91x_wdg.h" |
| #include "91x_scu.h" |
| /* Private typedef -----------------------------------------------------------*/ |
| /* Private define ------------------------------------------------------------*/ |
| |
| |
| /* WDG End of Count interrupt Flag */ |
| #define WDG_FLAG_EC 0x0001 |
| |
| |
| /* WDG End of Count interrupt request */ |
| #define WDG_IT_EC 0x0001 |
| |
| |
| |
| /* WDG Start/Stop counter */ |
| #define WDG_Counter_Start 0x0002 |
| #define WDG_Counter_Stop 0xFFFD |
| |
| |
| /* Private macro -------------------------------------------------------------*/ |
| /* Private variables ---------------------------------------------------------*/ |
| /* Registers reset value */ |
| /* Private function prototypes -----------------------------------------------*/ |
| /* Private functions ---------------------------------------------------------*/ |
| |
| /******************************************************************************* |
| * Function Name : WDG_StructInit |
| * Description : Fills the WDG_InitTypeDef structure member with its reset |
| * value. |
| * Input : WDG_InitStruct : pointer to a WDG_InitTypeDef structure |
| * which will be initialized. |
| * Output : None |
| * Return : None |
| *******************************************************************************/ |
| void WDG_StructInit(WDG_InitTypeDef *WDG_InitStruct) |
| { |
| |
| /* Select the source clock */ |
| WDG_InitStruct-> WDG_ClockSource = WDG_ClockSource_Apb; |
| |
| /* Initialize Prescaler */ |
| WDG_InitStruct->WDG_Prescaler =0xFF; |
| |
| /* Initialize Preload */ |
| WDG_InitStruct->WDG_Preload =0xFFFF; |
| |
| |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_Init |
| * Description : Initializes WDG peripheral according to the specified |
| * parameters in the WDG_InitStruct. |
| * Input : WDG_InitStruct: pointer to a WDG_InitTypeDef structure that |
| * contains the configuration information for the WDG peripheral. |
| * Output : None |
| * Return : None |
| *******************************************************************************/ |
| void WDG_Init(WDG_InitTypeDef* WDG_InitStruct) |
| { |
| |
| |
| if(WDG_InitStruct->WDG_ClockSource == WDG_ClockSource_Apb) |
| { |
| /* Select The APB clock as clock source */ |
| WDG->CR &= WDG_ClockSource_Apb; |
| } |
| |
| else |
| { |
| /* Select the RTC clock as source */ |
| WDG->CR |= WDG_ClockSource_Rtc ; |
| } |
| |
| /* Configure WDG Prescaler register value */ |
| WDG->PR = WDG_InitStruct->WDG_Prescaler; |
| |
| /* Configure WDG Pre-load register value */ |
| WDG->VR = WDG_InitStruct->WDG_Preload ; |
| |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_TimerModeCmd |
| * Description : Enables or disables the WDG timer mode |
| * Input : NewState: new state of the WDG peripheral (Newstate can be |
| * ENABLE or DISABLE) |
| * Output : None |
| * Return : None |
| *******************************************************************************/ |
| void WDG_TimerModeCmd(FunctionalState NewState) |
| { |
| if(NewState == ENABLE) |
| { |
| /* Start timer by setting SC bit in Control register */ |
| WDG->CR |= WDG_Counter_Start; |
| } |
| else |
| { |
| /* Stop timer by clearning SC bit in Control register */ |
| WDG->CR &= WDG_Counter_Stop; |
| } |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_StartWatchdogMode |
| * Description : Starts the watchdog mode |
| * Input : None |
| * Output : None |
| * Return : None |
| *******************************************************************************/ |
| void WDG_StartWatchdogMode(void) |
| { |
| /*reload watchdog*/ |
| WDG->KR = WDG_KeyValue1; |
| WDG->KR = WDG_KeyValue2; |
| |
| /*start watchdog*/ |
| WDG->CR |= WDG_Mode_Wdg; |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_ITConfig |
| * Description : Enables or disables the WDG End of Count(EC) interrupt. |
| * Input : Newstate: new state of the End of Count(EC) WDG interrupt. |
| * This parameter can be: ENABLE or DISABLE. |
| * Output : None |
| * Return : None |
| *******************************************************************************/ |
| void WDG_ITConfig(FunctionalState NewState) |
| { |
| if(NewState == ENABLE) |
| { |
| /* Enable the End of Count interrupt */ |
| WDG->MR |= WDG_IT_EC; |
| } |
| else |
| { |
| /* Disable the End of Count interrupt */ |
| WDG->MR &= ~WDG_IT_EC; |
| } |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_GetCounter |
| * Description : Gets the WDGs current counter value. |
| * Input : None |
| * Output : None |
| * Return : The WDG current counter value |
| *******************************************************************************/ |
| u16 WDG_GetCounter(void) |
| { |
| return WDG->CNT; |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_GetITStatus |
| * Description : Checks whether the WDG End of Count(EC) interrupt is occured or not. |
| * Input : None |
| * Output : None |
| * Return : The new state of WDG_IT (SET or RESET). |
| *******************************************************************************/ |
| ITStatus WDG_GetITStatus(void) |
| { |
| if(((WDG->SR & WDG_IT_EC) != RESET )&&((WDG->MR & WDG_IT_EC) != RESET )) |
| { |
| return SET; |
| } |
| else |
| { |
| return RESET; |
| } |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_ClearITPendingBit |
| * Description : Clears the WDG's End of Count(EC) interrupt pending bit. |
| * Input : None |
| * Output : None |
| * Return : None |
| *******************************************************************************/ |
| void WDG_ClearITPendingBit(void) |
| { |
| /* Clear the EC pending bit */ |
| WDG->SR &= ~WDG_IT_EC; |
| |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_ClearFlag |
| * Description : Clears the WDG's End of Count(EC) Flag. |
| * Input : None |
| * Output : None |
| * Return : None |
| *******************************************************************************/ |
| void WDG_ClearFlag(void) |
| { |
| /* Clear the EC Flag */ |
| |
| WDG->SR &= ~WDG_FLAG_EC; |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_GetFlagStatus |
| * Description : Checks whether the WDG End of Count(EC) flag is set or not. |
| * Input : None |
| * Output : None |
| * Return : The new state of the WDG_FLAG (SET or RESET). |
| *******************************************************************************/ |
| FlagStatus WDG_GetFlagStatus(void) |
| { |
| if((WDG->SR & WDG_FLAG_EC) != RESET ) |
| { |
| return SET; |
| } |
| else |
| { |
| return RESET; |
| } |
| } |
| |
| /******************************************************************************* |
| * Function Name : WDG_Reload |
| * Description : reloads the watchdog counter in watchdog mode |
| * Input : None |
| * Output : None |
| * Return : none |
| *******************************************************************************/ |
| void WDG_Reload(void) |
| { |
| WDG->KR = WDG_KeyValue1; |
| WDG->KR = WDG_KeyValue2; |
| } |
| |
| |
| /******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/ |