闲来无事，拿起STM32 的板子，实验一下看门狗程序，
结果发现 IWDG 和 WWDG 似乎均不起作用：
把程序贴上：
IWDG:
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System Clocks Configuration ---------------------------------------------*/
RCC_Configuration();
/* GPIO configuration ------------------------------------------------------*/
GPIO_Configuration();
/* Check if the system has resumed from IWDG reset -------------------------*/
if(RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET)
{ /* IWDGRST flag set */
/* Turn on led connected to PC.06 */
GPIO_WriteBit(GPIOB, GPIO_Pin_6, Bit_SET);
/* Clear reset flags */
RCC_ClearFlag();
}
else
{ /* IWDGRST flag is not set */
/* Turn off led connected to PC.06 */
GPIO_WriteBit(GPIOB, GPIO_Pin_6, Bit_RESET);
}
/* Configure EXTI Line9 to generate an interrupt on falling edge -----------*/
EXTI_Configuration();
/* NVIC configuration ------------------------------------------------------*/
NVIC_Configuration();
/* Configure SysTick to generate an interrupt each 250ms -------------------*/
SysTick_Configuration();
/* IWDG timeout equal to 350ms (the timeout may varies due to LSI frequency
dispersion) -------------------------------------------------------------*/
/* Enable write access to IWDG_PR and IWDG_RLR registers */
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* IWDG counter clock: 32KHz(LSI) / 32 = 1KHz */
IWDG_SetPrescaler(IWDG_Prescaler_32);
/* Set counter reload value to 349 */
IWDG_SetReload(349);
/* Reload IWDG counter */
IWDG_ReloadCounter();
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
while(1)
{
}
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK */
RCC_PCLK1Config(RCC_HCLK_Div1);
/* Flash 0 wait state */
FLASH_SetLatency(FLASH_Latency_0);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Select HSE as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
/* Wait till HSE is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x04)
{
}
}
/* Enable GPIOC, GPIOB and AFIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_AFIO, 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;
/* Configure PC.06 and PC.07 as Output push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Configure PB9 as input floating (EXTI Line9) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
WWDG:
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System Clocks Configuration ---------------------------------------------*/
RCC_Configuration();
/* GPIO configuration ------------------------------------------------------*/
GPIO_Configuration();
/* Check if the system has resumed from WWDG reset -------------------------*/
if(RCC_GetFlagStatus(RCC_FLAG_WWDGRST) != RESET)
{ /* WWDGRST flag set */
/* Turn on led connected to PC.06 */
GPIO_WriteBit(GPIOB, GPIO_Pin_6, Bit_SET);
/* Clear reset flags */
RCC_ClearFlag();
}
else
{ /* WWDGRST flag is not set */
/* Turn off led connected to PC.06 */
GPIO_WriteBit(GPIOB, GPIO_Pin_6, Bit_SET);
}
/* WWDG configuration --------------------------------------------------------*/
/* Enable WWDG clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);
/* WWDG clock counter = (PCLK1/4096)/8 = 244 Hz (~4 ms) */
WWDG_SetPrescaler(WWDG_Prescaler_8);
/* Set Window value to 0x41 */
WWDG_SetWindowValue(0x41);
/* Enable WWDG and set counter value to 0x7F, WWDG timeout = ~4 ms * 64 = 262 ms */
WWDG_Enable(0x7F);
/* Clear EWI flag */
WWDG_ClearFlag();
/* Enable EW interrupt */
WWDG_EnableIT();
while (1)
{
}
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK */
RCC_PCLK1Config(RCC_HCLK_Div1);
/* Flash 0 wait state */
FLASH_SetLatency(FLASH_Latency_0);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Select HSE as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
/* Wait till HSE is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x04)
{
}
}
/* Enable GPIOC, GPIOB and AFIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);
}
请大家看看。 |
楼主
标题置顶
标题高亮
