请教高手，为什么多路捕获只能第一路有效？

liuxy67 · 发表于 2017-10-5 09:55:35

我们用定时器2的第一、二路做输入捕获，但第二路始终没有数据，不知为何，请高手指教！程序如下：
TIM_ICInitTypeDef  TIM2_ICInitStructure;

void TIM2_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //ê1ÄüTIM2ê±Öó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //ê1ÄüGPIOAê±Öó

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0|GPIO_Pin_1;  //PA0 Çå3yÖ®Ç°éèÖÃ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //PA0 êäèë èõéÏà-
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_0|GPIO_Pin_1);    //PA0

//3õê¼»ˉ¶¨ê±Æ÷2 TIM2
TIM_TimeBaseStructure.TIM_Period = arr; //éè¶¨¼ÆêyÆ÷×Ô¶ˉÖØ×°Öμ
TIM_TimeBaseStructure.TIM_Prescaler =psc; //Ô¤·ÖÆμÆ÷
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòéÏ¼ÆêyÄ￡ê½
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥Î»

//3õê¼»ˉTIM2êäèë2¶»ñ2Îêy
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 Ñ¡Ôñêäèë¶Ë IC1ó3éäμ½TI1éÏ
    TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //ÏÂ½μÑØ2¶»ñ  TIM_ICPolarity_Rising; //éÏéyÑØ2¶»ñ
    TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //ó3éäμ½TI1éÏ
    TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;    //ÅäÖÃêäèë·ÖÆμ,2»·ÖÆμ
    TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 ÅäÖÃêäèëÂË2¨Æ÷ 2»ÂË2¨
    TIM_ICInit(TIM2, &TIM2_ICInitStructure);

TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC2S=01 Ñ¡Ôñêäèë¶Ë IC2ó3éäμ½TI1éÏ
    TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //ÏÂ½μÑØ2¶»ñ  TIM_ICPolarity_Rising; //éÏéyÑØ2¶»ñ
    TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //ó3éäμ½TI1éÏ
    TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;    //ÅäÖÃêäèë·ÖÆμ,2»·ÖÆμ
    TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 ÅäÖÃêäèëÂË2¨Æ÷ 2»ÂË2¨
    TIM_ICInit(TIM2, &TIM2_ICInitStructure);

//ÖD¶Ï·Ö×é3õê¼»ˉ
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;  //TIM2ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //ÏèÕ¼óÅÏè¼¶2¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //′óóÅÏè¼¶0¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);  //¸ù¾YNVIC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèNVIC¼Ä′æÆ÷

TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC1,ENABLE);//ÔêDí¸üDÂÖD¶Ï ,ÔêDíCC1IE2¶»ñÖD¶Ï
TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC2,ENABLE);

//TIM_ClearFlag(TIM3, TIM_IT_CC1| TIM_IT_CC2| TIM_FLAG_Update);
  TIM_Cmd(TIM2,ENABLE ); //ê1Äü¶¨ê±Æ÷2
}

u8  TIM2CH1_CAPTURE_STA=0,TIM2CH2_CAPTURE_STA=0; //êäèë2¶»ñ×′ì¬

u16 TIM2CH1_CAPTURE_VAL=0; //êäèë1
u16 TIM2CH1_CAPTURE_old=0;
u16 TIM2CH1_CAPTURE_now=0;

u16 TIM2CH2_CAPTURE_VAL=0; //êäèë2
u16 TIM2CH2_CAPTURE_old=0;
u16 TIM2CH2_CAPTURE_now=0; //êäèë2¶»ñÖμ

//¶¨ê±Æ÷5ÖD¶Ï·tÎñ3ìDò
void TIM2_IRQHandler(void)
{

if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //¼ÆêyÆ÷¼ÆÂú
{
TIM2CH1_CAPTURE_STA++;
if (TIM2CH1_CAPTURE_STA>0X01)
{
TIM2CH1_CAPTURE_STA=0;
TIM2CH1_CAPTURE_VAL=0XFFFF;
TIM2CH1_CAPTURE_old=0;
TIM2CH1_CAPTURE_now=0;
}

TIM2CH2_CAPTURE_STA++;
if (TIM2CH2_CAPTURE_STA>0X01)
{
TIM2CH2_CAPTURE_STA=0;
TIM2CH2_CAPTURE_VAL=0XFFFF;
TIM2CH2_CAPTURE_old=0;
TIM2CH2_CAPTURE_now=0;
}
TIM_ClearITPendingBit(TIM2, TIM_IT_Update); //Çå3yÖD¶Ï±êÖ¾Î»
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//2¶»ñ1·￠éú2¶»ñêÂ¼t
{
if( TIM2CH1_CAPTURE_VAL!=0XFFFF) //2¶»ñμ½ò»¸öÏÂ½μÑØ
{
TIM2CH1_CAPTURE_now=TIM_GetCapture1(TIM2);
TIM2CH1_CAPTURE_VAL=((TIM2CH1_CAPTURE_now+(TIM2CH1_CAPTURE_STA*50000))-TIM2CH1_CAPTURE_old)/2;
TIM2CH1_CAPTURE_old=TIM2CH1_CAPTURE_now;
TIM2CH1_CAPTURE_STA=0;
}
else
{
TIM2CH1_CAPTURE_old=TIM_GetCapture1(TIM2);
TIM2CH1_CAPTURE_now=0;
TIM2CH1_CAPTURE_VAL=0XFFFE;
TIM2CH1_CAPTURE_STA=0;
}
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1); //Çå3yÖD¶Ï±êÖ¾Î»
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)//2¶»ñ1·￠éú2¶»ñêÂ¼t
{
if( TIM2CH2_CAPTURE_VAL!=0XFFFF) //2¶»ñμ½ò»¸öÏÂ½μÑØ
{
TIM2CH2_CAPTURE_now=TIM_GetCapture2(TIM2);
TIM2CH2_CAPTURE_VAL=((TIM2CH2_CAPTURE_now+(TIM2CH2_CAPTURE_STA*50000))-TIM2CH2_CAPTURE_old)/2;
TIM2CH2_CAPTURE_old=TIM2CH2_CAPTURE_now;
TIM2CH2_CAPTURE_STA=0;
}
else
{
TIM2CH2_CAPTURE_old=TIM_GetCapture2(TIM2);
TIM2CH2_CAPTURE_now=0;
TIM2CH2_CAPTURE_VAL=0XFFFE;
TIM2CH2_CAPTURE_STA=0;
}
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2); //Çå3yÖD¶Ï±êÖ¾Î»
}

}