有个窗口看门狗的问题想问一下

只看该作者 · 2014-9-1 15:30

看手册上说有两种情况会复位：一、计数器小于0x40；二、在窗口外设置计数器。
现在我用想看看在窗口内进行喂狗的效果。所以用定时器中断在窗口内进行喂狗，程序如下：
#include "stm32f10x.h"

#define LED_OFF GPIO_SetBits(GPIOF, GPIO_Pin_7);
#define LED_ON GPIO_ResetBits(GPIOF, GPIO_Pin_7);

void GPIO_Configuration(void);
void RCC_Configuration(void);
void NVIC_Configuration(void);
void WWDG_Configuration(void);
void Timer_Configuration(void);
void  Delay(u32);

int main(void)
{
RCC_Configuration();
GPIO_Configuration();
WWDG_Configuration();
NVIC_Configuration();
Timer_Configuration();
LED_ON;    //开启LED灯，提示复位
Delay(100);
LED_OFF;    //关闭LED灯，提示复位结束
TIM_Cmd(TIM1, ENABLE);
while(1)
{

}
}

void WWDG_IRQHandler(void)    //窗口看门狗中断服务程序，设置计数器的值
{
  WWDG_ClearFlag();
  WWDG_SetCounter(0x43);
}

void TIM1_UP_IRQHandler(void)    //定时器中断服务程序，设置窗口看门狗计数器的值
{
WWDG_SetCounter(0x43);
TIM_ClearITPendingBit(TIM1, TIM_IT_Update);
}

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description : Configures the different system clocks.
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/
void RCC_Configuration(void)
{

/* Enable Prefetch Buffer 设置预取缓冲器可以提高CPU的执行速度*/
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);

/* RCC system reset(for debug purpose) */
RCC_DeInit();

/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);

/* Wait till HSE is ready */
while (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);
//也可以用：while (!(RCC_WaitForHSEStartUp()== SUCCESS));

/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);

/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

/* Enable PLL */
RCC_PLLCmd(ENABLE);

/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);

/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08);

/* Enable GPIOB clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOF|RCC_APB2Periph_TIM1 , ENABLE);// 使能APB2外设GPIOB时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //选择PX.10/11
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //管脚频率为50MHZ
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //模式为推挽输出
    GPIO_Init(GPIOF, &GPIO_InitStructure);

}
//GPIO的配置设置，包括管脚、模式和频率

void WWDG_Configuration(void)    //窗口看门狗初始化程序
{
  WWDG_SetPrescaler(WWDG_Prescaler_8);
  WWDG_SetWindowValue(0x70);
  WWDG_Enable(0x43);
  WWDG_ClearFlag();
  WWDG_EnableIT();

}

void NVIC_Configuration(void) //定时器和窗口看门狗中断的中断优先级
{
NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = WWDG_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_InitStructure.NVIC_IRQChannel=TIM1_UP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_Init(&NVIC_InitStructure);

}

void  Delay(u32  dly)
{  u16  i;

for(; dly>0; dly--)
   for(i=0; i<600; i++);
}

void Timer_Configuration(void) //定时器初始化程序，设置为很短的时间进入中断，然后进行喂狗

{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

  TIM_TimeBaseStructure.TIM_Prescaler = 0;  // No prescaling ,可以改变编码器计数对于脉冲输入个数的倍数。
  TIM_TimeBaseStructure.TIM_Period = 999;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  TIM_ClearFlag(TIM1, TIM_FLAG_Update);
  TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
  //Reset counter

      TIM_Cmd(TIM1, DISABLE);

}
程序运行结果是：LED灯始终在亮，应该是一直在复位。设置的计数器的值都是在窗口内，为什么还会复位呢？