原子大哥，请教一下，我在用TIM1的PWM输入捕获功能测周期和占空比的时候，进入不了定时器中断函数处理函数，这是什么原因啊？ 其中PWM脉冲是由TIM3产生的10kHz脉冲。
程序如下：
void Capture（void）
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_ResetBits(GPIOA, GPIO_Pin_8);
TIM_DeInit(TIM1); //将外设TIM1寄存器重设为默认值
/*设置时间基准*/
TIM_TimeBaseStructure.TIM_Prescaler=0; //时钟频率的预分频值
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period=7200-1; //自动重装载寄存器周期值
TIM_TimeBaseStructure.TIM_ClockDivision=0x0; //时钟分割值
TIM_TimeBaseStructure.TIM_RepetitionCounter=0x0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); //初始化TIM1的时间基数数据
TIM_ICInitStructure.TIM_Channel= TIM_Channel_1;//选择通道2
TIM_ICInitStructure.TIM_ICPolarity= TIM_ICPolarity_Rising;//上升沿
TIM_ICInitStructure.TIM_ICSelection= TIM_ICSelection_IndirectTI;//通道方向选择
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;/*每次检测到捕获输入就触发一次捕获 */
TIM_ICInitStructure.TIM_ICFilter=0x00;/* 对分频率没有影响 选择输入比较滤波器*/
TIM_PWMIConfig(TIM1, &TIM_ICInitStructure); //根据参数配置TIM外设信息
TIM_SelectInputTrigger(TIM1, TIM_TS_TI1FP1); //选择IC1为始终触发源
TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Reset);//TIM从模式：触发信号的上升沿重新初始化计数器和触发寄存器的更新事件
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable); //启动定时器的被动触发
TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE); //打开中断
TIM_Cmd(TIM1,ENABLE);
}
void TIM1_IRQHandler(void)
{
printf("进入TIM1_IRQHandler
");
TIM_ClearFlag(TIM1, TIM_IT_CC1);
}
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void PPM_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_ResetBits(GPIOA, GPIO_Pin_8);
TIM_DeInit(TIM1); //???TIM1?????????
/*??????*/
TIM_TimeBaseStructure.TIM_Prescaler=0; //?????????
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period=7200-1; //???????????
TIM_TimeBaseStructure.TIM_ClockDivision=0x0; //?????
TIM_TimeBaseStructure.TIM_RepetitionCounter=0x0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); //???TIM1???????
TIM_ICInitStructure.TIM_Channel= TIM_Channel_1;//????2
TIM_ICInitStructure.TIM_ICPolarity= TIM_ICPolarity_Rising;//???
TIM_ICInitStructure.TIM_ICSelection= TIM_ICSelection_IndirectTI;//??????
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;/*???????????????? */
TIM_ICInitStructure.TIM_ICFilter=0x00;/* ???????? ?????????*/
TIM_PWMIConfig(TIM1, &TIM_ICInitStructure); //??????TIM????
TIM_SelectInputTrigger(TIM1, TIM_TS_TI1FP1); //??IC1??????
TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Reset);//TIM???:???????????????????????????
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable); //??????????
TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE); //????
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn; //TIM1??
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //?????0?
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //????3?
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?????
NVIC_Init(&NVIC_InitStructure); //??NVIC_InitStruct???????????NVIC???
TIM_Cmd(TIM1,ENABLE);
TIM1->SR=0; TIM_ClearITPendingBit(TIM1, TIM_IT_CC1);
}
/////////////////////////////////////////////////////////
void TIM1_CC_IRQHander(void)
{
if(TIM_GetITStatus(TIM1,TIM_IT_CC1)!= RESET)
{
TIM_ClearITPendingBit(TIM1, TIM_IT_CC1);
}
}
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