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jeremybenn |
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
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* File Name : stm32f10x_iwdg.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 IWDG 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_iwdg.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* ---------------------- IWDG registers bit mask ------------------------ */
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/* KR register bit mask */
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#define KR_Reload ((u16)0xAAAA)
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#define KR_Enable ((u16)0xCCCC)
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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 : IWDG_WriteAccessCmd
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* Description : Enables or disables write access to IWDG_PR and IWDG_RLR
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* registers.
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* Input : - IWDG_WriteAccess: new state of write access to IWDG_PR and
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* IWDG_RLR registers.
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* This parameter can be one of the following values:
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* - IWDG_WriteAccess_Enable: Enable write access to
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* IWDG_PR and IWDG_RLR registers
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* - IWDG_WriteAccess_Disable: Disable write access to
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* IWDG_PR and IWDG_RLR registers
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* Output : None
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* Return : None
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*******************************************************************************/
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void IWDG_WriteAccessCmd(u16 IWDG_WriteAccess)
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{
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/* Check the parameters */
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assert(IS_IWDG_WRITE_ACCESS(IWDG_WriteAccess));
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IWDG->KR = IWDG_WriteAccess;
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}
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/*******************************************************************************
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* Function Name : IWDG_SetPrescaler
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* Description : Sets IWDG Prescaler value.
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* Input : - IWDG_Prescaler: specifies the IWDG Prescaler value.
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* This parameter can be one of the following values:
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* - IWDG_Prescaler_4: IWDG prescaler set to 4
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* - IWDG_Prescaler_8: IWDG prescaler set to 8
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* - IWDG_Prescaler_16: IWDG prescaler set to 16
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* - IWDG_Prescaler_32: IWDG prescaler set to 32
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* - IWDG_Prescaler_64: IWDG prescaler set to 64
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* - IWDG_Prescaler_128: IWDG prescaler set to 128
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* - IWDG_Prescaler_256: IWDG prescaler set to 256
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* Output : None
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* Return : None
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*******************************************************************************/
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void IWDG_SetPrescaler(u8 IWDG_Prescaler)
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{
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/* Check the parameters */
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assert(IS_IWDG_PRESCALER(IWDG_Prescaler));
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IWDG->PR = IWDG_Prescaler;
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}
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/*******************************************************************************
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* Function Name : IWDG_SetReload
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* Description : Sets IWDG Reload value.
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* Input : - Reload: specifies the IWDG Reload value.
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* This parameter must be a number between 0 and 0x0FFF.
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* Output : None
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* Return : None
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*******************************************************************************/
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void IWDG_SetReload(u16 Reload)
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{
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/* Check the parameters */
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assert(IS_IWDG_RELOAD(Reload));
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IWDG->RLR = Reload;
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}
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/*******************************************************************************
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* Function Name : IWDG_ReloadCounter
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* Description : Reloads IWDG counter with value defined in the reload register
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* (write access to IWDG_PR and IWDG_RLR registers disabled).
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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 IWDG_ReloadCounter(void)
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{
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IWDG->KR = KR_Reload;
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}
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/*******************************************************************************
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* Function Name : IWDG_Enable
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* Description : Enables IWDG (write access to IWDG_PR and IWDG_RLR registers
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* disabled).
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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 IWDG_Enable(void)
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{
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IWDG->KR = KR_Enable;
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}
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/*******************************************************************************
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* Function Name : IWDG_GetFlagStatus
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* Description : Checks whether the specified IWDG flag is set or not.
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* Input : - IWDG_FLAG: specifies the flag to check.
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* This parameter can be one of the following values:
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* - IWDG_FLAG_PVU: Prescaler Value Update on going
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* - IWDG_FLAG_RVU: Reload Value Update on going
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* Output : None
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* Return : The new state of IWDG_FLAG (SET or RESET).
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*******************************************************************************/
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FlagStatus IWDG_GetFlagStatus(u16 IWDG_FLAG)
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{
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FlagStatus bitstatus = RESET;
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/* Check the parameters */
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assert(IS_IWDG_FLAG(IWDG_FLAG));
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if ((IWDG->SR & IWDG_FLAG) != (u32)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 the flag status */
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return bitstatus;
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}
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/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
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