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jeremybenn |
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
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* File Name : stm32f10x_wwdg.c
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* Author : MCD Application Team
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* Date First Issued : 09/29/2006
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* Description : This file provides all the WWDG firmware functions.
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********************************************************************************
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* History:
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* 04/02/2007: V0.2
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* 02/05/2007: V0.1
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* 09/29/2006: V0.01
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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 "stm32f10x_wwdg.h"
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#include "stm32f10x_rcc.h"
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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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/* Alias word address of EWIF bit */
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#define SR_OFFSET (WWDG_OFFSET + 0x08)
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#define EWIF_BitNumber 0x00
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#define SR_EWIF_BB (PERIPH_BB_BASE + (SR_OFFSET * 32) + (EWIF_BitNumber * 4))
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/* --------------------- WWDG registers bit mask ------------------------ */
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/* CR register bit mask */
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#define CR_WDGA_Set ((u32)0x00000080)
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/* CFR register bit mask */
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#define CFR_WDGTB_Mask ((u32)0xFFFFFE7F)
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#define CFR_W_Mask ((u32)0xFFFFFF80)
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#define BIT_Mask ((u8)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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/*******************************************************************************
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* Function Name : WWDG_DeInit
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* Description : Deinitializes the WWDG 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 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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* Function Name : WWDG_SetPrescaler
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* Description : Sets the WWDG Prescaler.
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* Input : - WWDG_Prescaler: specifies the WWDG Prescaler.
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* This parameter can be one of the following values:
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* - WWDG_Prescaler_1: WWDG counter clock = (PCLK1/4096)/1
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* - WWDG_Prescaler_2: WWDG counter clock = (PCLK1/4096)/2
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* - WWDG_Prescaler_4: WWDG counter clock = (PCLK1/4096)/4
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* - WWDG_Prescaler_8: WWDG counter clock = (PCLK1/4096)/8
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* Output : None
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* Return : None
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*******************************************************************************/
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void WWDG_SetPrescaler(u32 WWDG_Prescaler)
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{
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u32 tmpreg = 0;
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/* Check the parameters */
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assert(IS_WWDG_PRESCALER(WWDG_Prescaler));
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/* Clear WDGTB[8:7] bits */
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tmpreg = WWDG->CFR & CFR_WDGTB_Mask;
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/* Set WDGTB[8:7] 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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* Function Name : WWDG_SetWindowValue
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* Description : Sets the WWDG window value.
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* Input : - WindowValue: specifies the window value to be compared to
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* the downcounter.
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* This parameter value must be lower than 0x80.
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* Output : None
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* Return : None
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*******************************************************************************/
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void WWDG_SetWindowValue(u8 WindowValue)
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{
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u32 tmpreg = 0;
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/* Check the parameters */
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assert(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 & 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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* Function Name : WWDG_EnableIT
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* Description : Enables the WWDG Early Wakeup interrupt(EWI).
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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 WWDG_EnableIT(void)
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{
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*(vu32 *) CFR_EWI_BB = (u32)ENABLE;
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}
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/*******************************************************************************
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* Function Name : WWDG_SetCounter
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* Description : Sets the WWDG counter value.
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* Input : - Counter: specifies the watchdog counter value.
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* This parameter must be a number between 0x40 and 0x7F.
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* Output : None
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* Return : None
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*******************************************************************************/
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void WWDG_SetCounter(u8 Counter)
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{
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/* Check the parameters */
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assert(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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* Function Name : WWDG_Enable
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* Description : Enables WWDG and load the counter value.
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* - Counter: specifies the watchdog counter value.
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* This parameter must be a number between 0x40 and 0x7F.
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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 WWDG_Enable(u8 Counter)
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{
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/* Check the parameters */
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assert(IS_WWDG_COUNTER(Counter));
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WWDG->CR = CR_WDGA_Set | Counter;
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}
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/*******************************************************************************
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* Function Name : WWDG_GetFlagStatus
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* Description : Checks whether the Early Wakeup interrupt 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 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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return (FlagStatus)(*(vu32 *) SR_EWIF_BB);
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}
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/*******************************************************************************
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* Function Name : WWDG_ClearFlag
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* Description : Clears Early Wakeup interrupt 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 WWDG_ClearFlag(void)
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{
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WWDG->SR = (u32)RESET;
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}
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/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
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