【求助】应用输入捕获功能，影响串口通讯。

chenleiweb

我使用的芯片是STM32F103T8U6，做输入脉冲捕获，目的实现相邻脉冲时间间隔统计，可是我用信号发生器模拟脉冲输入的时候，脉冲输入频率大于60Hz串口通讯就不稳定了，在大的话串口受到很大影响，直到不通讯了。请大侠指点。



void NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure; 

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

    

/* Enable the USART1 Interrupt */

  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

  //----------------------------------------------------------------

  NVIC_InitStructure.NVIC_IRQChannel                   = TIM2_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority         = 2;

  NVIC_InitStructure.NVIC_IRQChannelCmd                 = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

//----------------------------------------------------------------

  NVIC_InitStructure.NVIC_IRQChannel                   = TIM3_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority         = 1;

  NVIC_InitStructure.NVIC_IRQChannelCmd                 = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

}

//-----------------------------------------------------------------------------

void Initial_Timer2_ExternalClock(void)

{

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

//----

TIM_DeInit(TIM2);   //yjj??

TIM_TimeBaseStructure.TIM_Period   = 4999;

TIM_TimeBaseStructure.TIM_Prescaler = 7199;                 //??????count???????á±?·????????ó????±?·?????????????????1??

TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;     //=TIM1_CKD_DIV4,??????CK_INT??·????????ùfilter???????í????????????????

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   //TIM?ò??????????

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);     //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);

//----------------------------------------------------

TIM_Cmd(TIM2, ENABLE);  //????TIMx???è  

}

//------------------------------------------------------

void TIM2_IRQHandler(void)

{

  //----

if(TIM_GetFlagStatus(TIM2, TIM_IT_CC1) != RESET)

{

if (DI_X1 == 0)

{

PTim2Cout++;

if(chen == 0 && PTim2Cout > 10)

{

PTim2Cout = 0;

chen = 1;

GPIO_SetBits(MCU_POWER_DIR); //??????????

}

else if(chen == 1 && PTim2Cout > 6)

{

chen = 0;

PTim2Cout = 0;

GPIO_ResetBits(MCU_POWER_DIR); //??????????  

}

}

else   PTim2Cout = 0;

    TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);        

}

}

//-----------------------------------------------------------------------------

//?????¨?±?÷?????????????????±????????????PA6????????????????

void Initial_Timer3_ExternalClock(void)

{

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

TIM_ICInitTypeDef  TIM3_ICInitStructure;

//----

TIM_DeInit(TIM3);   //yjj??

TIM_TimeBaseStructure.TIM_Period   = 65535;

TIM_TimeBaseStructure.TIM_Prescaler = 719;                //??????count???????á±?·????????ó????±?·?????????????????1??

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //=TIM1_CKD_DIV4,??????CK_INT??·????????ùfilter???????í????????????????

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   //TIM?ò??????????

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);    //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

  //??????TIM3????????????

TIM3_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 ?????????? IC1??????TI1??

TIM3_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //??????????

TIM3_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //??????TI1??

TIM3_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //????????·???,??·??? 

TIM3_ICInitStructure.TIM_ICFilter = 0x00; //IC1F=0000 ???????????¨?÷ ?????¨

TIM_ICInit(TIM3, &TIM3_ICInitStructure);

TIM_ITConfig(TIM3, TIM_IT_Update | TIM_IT_CC1, ENABLE); //???í?ü?????? ,???íCC1IE????????

TIM_Cmd(TIM3, ENABLE);  //????TIM3  

}

//------------------------------------------------------

void TIM3_IRQHandler(void)

{

if((TIM3CH1_CAPTURE_STA&0X80)==0) //????????????

{  

if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)

{    

//if((TIM3CH1_CAPTURE_STA&0X3F)==0X3F)//?????????¤??

if((TIM3CH1_CAPTURE_STA&0X08)==0X08)//?????????¤???¨LND712_5S_0X08??\?¨ZP1206_8S_0X0C??\?¨J705_20S_0X1E??

{

TIM3CH1_CAPTURE_STA|=0X80; //±ê????????????????

TIM3CH1_CAPTURE_VAL=0XFFFF;

GPIO_SetBits(MCU_POWER_C);

delay_ms(2);

}else TIM3CH1_CAPTURE_STA++;

}

if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)//????1·??ú????????

{

TIM3CH1_CAPTURE_STA|=0X80; //±ê??????????????????????

TIM3CH1_CAPTURE_VAL=TIM_GetCapture1(TIM3);

GPIO_SetBits(MCU_POWER_C);

delay_ms(2);    

}           

  }  

  TIM_ClearITPendingBit(TIM3, TIM_IT_CC1|TIM_IT_Update); //????????±ê????

}

正点原子

你的中断服务函数里面,延时函数去掉试试.
delay_ms,去掉!!

chenleiweb

回复【2楼】正点原子:
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谢谢