关于输入捕获的问题

wysjsj

void DC_TIM5_Cap_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM5_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
    
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE);  
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOC,GPIO_PinSource1, GPIO_AF_TIM5);

TIM_TimeBaseStructure.TIM_Period            = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler         = 84-1;    //1M Hz
TIM_TimeBaseStructure.TIM_ClockDivision     = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode       = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM5,&TIM_TimeBaseStructure); 

TIM5_ICInitStructure.TIM_Channel     = TIM_Channel_2;
// TIM5_ICInitStructure.TIM_Channel   = TIM_Channel_1;       //改为通道1
TIM5_ICInitStructure.TIM_ICPolarity  = TIM_ICPolarity_Rising;
TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; 
TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; 
TIM5_ICInitStructure.TIM_ICFilter    = 0;
TIM_ICInit(TIM5,&TIM5_ICInitStructure); 
  
NVIC_InitStructure.NVIC_IRQChannel                   = TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority        = 1; 
NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM_ClearFlag(TIM5,TIM_IT_CC1|TIM_IT_CC2);
TIM_ITConfig(TIM5,TIM_IT_CC1|TIM_IT_CC2,ENABLE);
TIM_Cmd(TIM5,ENABLE);
}

u8   TIM5CH1_CAPTURE_STA = 0;   //输入捕获状态             
u16  TIM5CH1_CAPTURE_VAL = 0;   //输入捕获值
static u8 k = 0,i;
void TIM5_IRQHandler(void)
{
if ((TIM5->SR & TIM_IT_CC1) && (TIM5->DIER & TIM_IT_CC1)) //捕获 1 发生捕获事件
{
if(TIM5CH1_CAPTURE_STA == 1)    //捕获到一个下降沿 
{
TIM5CH1_CAPTURE_STA = 0;
TIM5CH1_CAPTURE_VAL = TIM5->CCR1;
// TIM5CH1_CAPTURE_VAL = TIM5->CCR1;
TIM5->CCER &= ~(1<<1);   //设置为上升沿捕获
TIM_CAP_SET[k++] = (u8)(TIM5CH1_CAPTURE_VAL / 1000);
}
else                   //捕获上升沿
{
// TIM5CH1_CAPTURE_STA=0;      //清空
TIM5CH1_CAPTURE_VAL = 0;
TIM1->CNT = 0;
TIM5CH1_CAPTURE_STA = 1;     //标记捕获到了上升沿
TIM5->CCER |= 1<<1; //设置为下降沿捕获
}

}

if ((TIM5->SR & TIM_IT_CC2) && (TIM5->DIER & TIM_IT_CC2)) //捕获 1 发生捕获事件
{
if(TIM5CH1_CAPTURE_STA == 1)    //捕获到一个下降沿 
{
TIM5CH1_CAPTURE_STA = 0;
TIM5CH1_CAPTURE_VAL = TIM5->CCR2;
// TIM5CH1_CAPTURE_VAL = TIM5->CCR1;
TIM5->CCER &= ~(1<<1);   //设置为上升沿捕获

TIM_CAP_SET[k++] = (u8)(TIM5CH1_CAPTURE_VAL / 1000);
}
else                   //捕获上升沿
{
// TIM5CH1_CAPTURE_STA=0;      //清空
TIM5CH1_CAPTURE_VAL = 0;
TIM1->CNT = 0;
TIM5CH1_CAPTURE_STA = 1;     //标记捕获到了上升沿
TIM5->CCER |= 1<<1; //设置为下降沿捕获
}
}
TIM5->SR = ~(TIM_IT_CC1|TIM_IT_CC2);  //清除中断标志位
}

求助大神，PC1口有连续变化的高电平，想通过TIM5输入捕获到高电平持续时间，但是使用通道2时，只能进入使能TIM_IT_CC1中断，使用通道1时，只能进入使能TIM_IT_CC2中断，并且TIM5_CCR1,TIM5_CCR2都锁存不到TIM5_CNT的值，捕获的到电平长度，不知道什么原因，板子是STM32F429。

正点原子

帮顶。。。。