www.pudn.com > Micrium-ST-uCOS-II-LCD-STM32-SK.rar > stm32f10x_iwdg.c

/******************** (C) COPYRIGHT 2007 STMicroelectronics ******************** 
* File Name          : stm32f10x_iwdg.c 
* Author             : MCD Application Team 
* Date First Issued  : 09/29/2006 
* Description        : This file provides all the IWDG firmware functions. 
******************************************************************************** 
* History: 
* 05/21/2007: V0.3 
* 04/02/2007: V0.2 
* 02/05/2007: V0.1 
* 09/29/2006: V0.01 
******************************************************************************** 
* 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 "stm32f10x_iwdg.h" 
 
/* Private typedef -----------------------------------------------------------*/ 
/* Private define ------------------------------------------------------------*/ 
/* ---------------------- IWDG registers bit mask ------------------------ */ 
/* KR register bit mask */ 
#define KR_Reload    ((u16)0xAAAA) 
#define KR_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(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(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(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_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_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(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 2007 STMicroelectronics *****END OF FILE****/