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/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_wwdg.c
* Author : MCD Application Team
* Version : V2.0.2
* Date : 07/11/2008
* Description : This file provides all the WWDG firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE 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 FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_wwdg.h"
#include "stm32f10x_rcc.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* ----------- WWDG registers bit address in the alias region ----------- */
#define WWDG_OFFSET (WWDG_BASE - PERIPH_BASE)
/* Alias word address of EWI bit */
#define CFR_OFFSET (WWDG_OFFSET + 0x04)
#define EWI_BitNumber 0x09
#define CFR_EWI_BB (PERIPH_BB_BASE + (CFR_OFFSET * 32) + (EWI_BitNumber * 4))
/* --------------------- WWDG registers bit mask ------------------------ */
/* CR register bit mask */
#define CR_WDGA_Set ((u32)0x00000080)
/* CFR register bit mask */
#define CFR_WDGTB_Mask ((u32)0xFFFFFE7F)
#define CFR_W_Mask ((u32)0xFFFFFF80)
#define BIT_Mask ((u8)0x7F)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : WWDG_DeInit
* Description : Deinitializes the WWDG peripheral registers to their default
* reset values.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void WWDG_DeInit(void)
{
RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, DISABLE);
}
/*******************************************************************************
* Function Name : WWDG_SetPrescaler
* Description : Sets the WWDG Prescaler.
* Input : - WWDG_Prescaler: specifies the WWDG Prescaler.
* This parameter can be one of the following values:
* - WWDG_Prescaler_1: WWDG counter clock = (PCLK1/4096)/1
* - WWDG_Prescaler_2: WWDG counter clock = (PCLK1/4096)/2
* - WWDG_Prescaler_4: WWDG counter clock = (PCLK1/4096)/4
* - WWDG_Prescaler_8: WWDG counter clock = (PCLK1/4096)/8
* Output : None
* Return : None
*******************************************************************************/
void WWDG_SetPrescaler(u32 WWDG_Prescaler)
{
u32 tmpreg = 0;
/* Check the parameters */
assert_param(IS_WWDG_PRESCALER(WWDG_Prescaler));
/* Clear WDGTB[1:0] bits */
tmpreg = WWDG->CFR & CFR_WDGTB_Mask;
/* Set WDGTB[1:0] bits according to WWDG_Prescaler value */
tmpreg |= WWDG_Prescaler;
/* Store the new value */
WWDG->CFR = tmpreg;
}
/*******************************************************************************
* Function Name : WWDG_SetWindowValue
* Description : Sets the WWDG window value.
* Input : - WindowValue: specifies the window value to be compared to
* the downcounter.
* This parameter value must be lower than 0x80.
* Output : None
* Return : None
*******************************************************************************/
void WWDG_SetWindowValue(u8 WindowValue)
{
u32 tmpreg = 0;
/* Check the parameters */
assert_param(IS_WWDG_WINDOW_VALUE(WindowValue));
/* Clear W[6:0] bits */
tmpreg = WWDG->CFR & CFR_W_Mask;
/* Set W[6:0] bits according to WindowValue value */
tmpreg |= WindowValue & BIT_Mask;
/* Store the new value */
WWDG->CFR = tmpreg;
}
/*******************************************************************************
* Function Name : WWDG_EnableIT
* Description : Enables the WWDG Early Wakeup interrupt(EWI).
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void WWDG_EnableIT(void)
{
*(vu32 *) CFR_EWI_BB = (u32)ENABLE;
}
/*******************************************************************************
* Function Name : WWDG_SetCounter
* Description : Sets the WWDG counter value.
* Input : - Counter: specifies the watchdog counter value.
* This parameter must be a number between 0x40 and 0x7F.
* Output : None
* Return : None
*******************************************************************************/
void WWDG_SetCounter(u8 Counter)
{
/* Check the parameters */
assert_param(IS_WWDG_COUNTER(Counter));
/* Write to T[6:0] bits to configure the counter value, no need to do
a read-modify-write; writing a 0 to WDGA bit does nothing */
WWDG->CR = Counter & BIT_Mask;
}
/*******************************************************************************
* Function Name : WWDG_Enable
* Description : Enables WWDG and load the counter value.
* - Counter: specifies the watchdog counter value.
* This parameter must be a number between 0x40 and 0x7F.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void WWDG_Enable(u8 Counter)
{
/* Check the parameters */
assert_param(IS_WWDG_COUNTER(Counter));
WWDG->CR = CR_WDGA_Set | Counter;
}
/*******************************************************************************
* Function Name : WWDG_GetFlagStatus
* Description : Checks whether the Early Wakeup interrupt flag is set or not.
* Input : None
* Output : None
* Return : The new state of the Early Wakeup interrupt flag (SET or RESET)
*******************************************************************************/
FlagStatus WWDG_GetFlagStatus(void)
{
return (FlagStatus)(WWDG->SR);
}
/*******************************************************************************
* Function Name : WWDG_ClearFlag
* Description : Clears Early Wakeup interrupt flag.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void WWDG_ClearFlag(void)
{
WWDG->SR = (u32)RESET;
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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