使用STM32F103,用定时器中断,输出比较---输入捕获---定时器更新中断,都发现;我只使能了一个通道的中断,但是每次进中断的是都会出现CC1IF到CC4IF中断标志位全部都置位;这个是为什么呀? |
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如果你没使能相关事件的中断,也肯定不会因该事件而进中断的。
void TIM4_Init( u16 arr, u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure={0};
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure={0};
NVIC_InitTypeDef NVIC_InitStructure = {0};
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD | RCC_APB2Periph_TIM1, ENABLE );
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15|GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOD, &GPIO_InitStructure );
TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit( TIM4, &TIM_TimeBaseInitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ARRPreloadConfig(TIM4, ENABLE);
TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
TIM_Cmd( TIM4, ENABLE );
}
void TIM4_IRQHandler(void)
{
if(TIM_GetITStatus(TIM4,TIM_IT_Update) == SET)
{
// __disable_irq();
GPIO_SetBits(GPIOD,GPIO_Pin_15);
GPIO_ResetBits(GPIOD,GPIO_Pin_15);
// __enable_irq();
TIM_ClearFlag(TIM4,TIM_IT_Update);
}
}
int main(void)
{
USART_Printf_Init(115200);
printf("SystemClk:%d\r\n",SystemCoreClock);
TIM4_Init( 36000, 3-1);//144/3/36000=1.33KHz
while(1)
{
GPIO_SetBits(GPIOD,GPIO_Pin_14);
GPIO_ResetBits(GPIOD,GPIO_Pin_14);
};
}
void TIM4_Init( u16 arr, u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure={0};
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure={0};
NVIC_InitTypeDef NVIC_InitStructure = {0};
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD | RCC_APB2Periph_TIM1, ENABLE );
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15|GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOD, &GPIO_InitStructure );
TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit( TIM4, &TIM_TimeBaseInitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ARRPreloadConfig(TIM4, ENABLE);
TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
TIM_Cmd( TIM4, ENABLE );
}
void TIM4_IRQHandler(void)
{
if(TIM_GetITStatus(TIM4,TIM_IT_Update) == SET)
{
// __disable_irq();
GPIO_SetBits(GPIOD,GPIO_Pin_15);
GPIO_ResetBits(GPIOD,GPIO_Pin_15);
// __enable_irq();
TIM_ClearFlag(TIM4,TIM_IT_Update);
}
}
int main(void)
{
USART_Printf_Init(115200);
printf("SystemClk:%d\r\n",SystemCoreClock);
TIM4_Init( 36000, 3-1);//144/3/36000=1.33KHz
while(1)
{
GPIO_SetBits(GPIOD,GPIO_Pin_14);
GPIO_ResetBits(GPIOD,GPIO_Pin_14);
};
}
没有你说的那些,直接这样 在debug下看CC1IF/CC2IF/CC3IF/CC4IF全都会被置1