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/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_iwdg.c
* Author : MCD Application Team
* Version : V2.0.2
* Date : 07/11/2008
* Description : This file provides all the IWDG 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_iwdg.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* ---------------------- IWDG registers bit mask ------------------------ */
/* KR register bit mask */
#define KR_KEY_Reload ((u16)0xAAAA)
#define KR_KEY_Enable ((u16)0xCCCC)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : IWDG_WriteAccessCmd
* Description : Enables or disables write access to IWDG_PR and IWDG_RLR
* registers.
* Input : - IWDG_WriteAccess: new state of write access to IWDG_PR and
* IWDG_RLR registers.
* This parameter can be one of the following values:
* - IWDG_WriteAccess_Enable: Enable write access to
* IWDG_PR and IWDG_RLR registers
* - IWDG_WriteAccess_Disable: Disable write access to
* IWDG_PR and IWDG_RLR registers
* Output : None
* Return : None
*******************************************************************************/
void IWDG_WriteAccessCmd(u16 IWDG_WriteAccess)
{
/* Check the parameters */
assert_param(IS_IWDG_WRITE_ACCESS(IWDG_WriteAccess));
IWDG->KR = IWDG_WriteAccess;
}
/*******************************************************************************
* Function Name : IWDG_SetPrescaler
* Description : Sets IWDG Prescaler value.
* Input : - IWDG_Prescaler: specifies the IWDG Prescaler value.
* This parameter can be one of the following values:
* - IWDG_Prescaler_4: IWDG prescaler set to 4
* - IWDG_Prescaler_8: IWDG prescaler set to 8
* - IWDG_Prescaler_16: IWDG prescaler set to 16
* - IWDG_Prescaler_32: IWDG prescaler set to 32
* - IWDG_Prescaler_64: IWDG prescaler set to 64
* - IWDG_Prescaler_128: IWDG prescaler set to 128
* - IWDG_Prescaler_256: IWDG prescaler set to 256
* Output : None
* Return : None
*******************************************************************************/
void IWDG_SetPrescaler(u8 IWDG_Prescaler)
{
/* Check the parameters */
assert_param(IS_IWDG_PRESCALER(IWDG_Prescaler));
IWDG->PR = IWDG_Prescaler;
}
/*******************************************************************************
* Function Name : IWDG_SetReload
* Description : Sets IWDG Reload value.
* Input : - Reload: specifies the IWDG Reload value.
* This parameter must be a number between 0 and 0x0FFF.
* Output : None
* Return : None
*******************************************************************************/
void IWDG_SetReload(u16 Reload)
{
/* Check the parameters */
assert_param(IS_IWDG_RELOAD(Reload));
IWDG->RLR = Reload;
}
/*******************************************************************************
* Function Name : IWDG_ReloadCounter
* Description : Reloads IWDG counter with value defined in the reload register
* (write access to IWDG_PR and IWDG_RLR registers disabled).
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void IWDG_ReloadCounter(void)
{
IWDG->KR = KR_KEY_Reload;
}
/*******************************************************************************
* Function Name : IWDG_Enable
* Description : Enables IWDG (write access to IWDG_PR and IWDG_RLR registers
* disabled).
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void IWDG_Enable(void)
{
IWDG->KR = KR_KEY_Enable;
}
/*******************************************************************************
* Function Name : IWDG_GetFlagStatus
* Description : Checks whether the specified IWDG flag is set or not.
* Input : - IWDG_FLAG: specifies the flag to check.
* This parameter can be one of the following values:
* - IWDG_FLAG_PVU: Prescaler Value Update on going
* - IWDG_FLAG_RVU: Reload Value Update on going
* Output : None
* Return : The new state of IWDG_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus IWDG_GetFlagStatus(u16 IWDG_FLAG)
{
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_IWDG_FLAG(IWDG_FLAG));
if ((IWDG->SR & IWDG_FLAG) != (u32)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
/* Return the flag status */
return bitstatus;
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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