STM32F103输入捕获50HzPWM得到的值一直递减

追梦者之友 · 发表于 2017-2-10 09:16:52

void PWM_IN_Config(void)
{

   GPIO_InitTypeDef       GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
   TIM_ICInitTypeDef  TIM4_ICInitStructure;

   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);    //ê1ÄüTIM4ê±Öó
   RCC_APB2PeriphClockCmd(RCC_GPIO_TIM4, ENABLE);

   GPIO_InitStructure.GPIO_Pin  = TIM4_CH1 | TIM4_CH2 | TIM4_CH3 | TIM4_CH4;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
   GPIO_Init(GPIOB, &GPIO_InitStructure);
   GPIO_ResetBits(GPIO_TIM4,TIM4_CH1 | TIM4_CH2 | TIM4_CH3 | TIM4_CH4);

   //3õê¼»ˉ¶¨ê±Æ÷4 TIM4
   TIM_TimeBaseStructure.TIM_Period = 2499;                //éè¶¨¼ÆêyÆ÷×Ô¶ˉÖØ×°Öμ
   TIM_TimeBaseStructure.TIM_Prescaler =71;                      //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(TIM4, &TIM_TimeBaseStructure);             //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥Î»

   //3õê¼»ˉTIM4êäèë2¶»ñ2Îêy
   TIM4_ICInitStructure.TIM_Channel = TIM_Channel_1;             //CC1S=01 Ñ¡Ôñêäèë¶Ë IC1ó3éäμ½TI1éÏ
    TIM4_ICInitStructure.TIM_ICPolarity =TIM_ICPolarity_Rising;    //éÏéyÑØ2¶»ñ
    TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //ó3éäμ½TI1éÏ
    TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;          //ÅäÖÃêäèë·ÖÆμ,2»·ÖÆμ
    TIM4_ICInitStructure.TIM_ICFilter = 0x00;                      //IC1F=0000 ÅäÖÃêäèëÂË2¨Æ÷ 2»ÂË2¨
    TIM_ICInit(TIM4, &TIM4_ICInitStructure);

   TIM4_ICInitStructure.TIM_Channel = TIM_Channel_2;             //CC1S=01 Ñ¡Ôñêäèë¶Ë IC1ó3éäμ½TI1éÏ
    TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;    //éÏéyÑØ2¶»ñ
    TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //ó3éäμ½TI1éÏ
    TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;          //ÅäÖÃêäèë·ÖÆμ,2»·ÖÆμ
    TIM4_ICInitStructure.TIM_ICFilter = 0x00;                      //IC1F=0000 ÅäÖÃêäèëÂË2¨Æ÷ 2»ÂË2¨
    TIM_ICInit(TIM4, &TIM4_ICInitStructure);

TIM4_ICInitStructure.TIM_Channel = TIM_Channel_3;             //CC1S=01 Ñ¡Ôñêäèë¶Ë IC1ó3éäμ½TI1éÏ
    TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;    //éÏéyÑØ2¶»ñ
    TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //ó3éäμ½TI1éÏ
    TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;          //ÅäÖÃêäèë·ÖÆμ,2»·ÖÆμ
    TIM4_ICInitStructure.TIM_ICFilter = 0x00;                      //IC1F=0000 ÅäÖÃêäèëÂË2¨Æ÷ 2»ÂË2¨
    TIM_ICInit(TIM4, &TIM4_ICInitStructure);

TIM4_ICInitStructure.TIM_Channel = TIM_Channel_4;             //CC1S=01 Ñ¡Ôñêäèë¶Ë IC1ó3éäμ½TI1éÏ
    TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;    //éÏéyÑØ2¶»ñ
    TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //ó3éäμ½TI1éÏ
    TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;          //ÅäÖÃêäèë·ÖÆμ,2»·ÖÆμ
    TIM4_ICInitStructure.TIM_ICFilter = 0x00;                      //IC1F=0000 ÅäÖÃêäèëÂË2¨Æ÷ 2»ÂË2¨
    TIM_ICInit(TIM4, &TIM4_ICInitStructure);

   TIM_Cmd(TIM4,ENABLE );

   TIM_ITConfig(TIM4, TIM_IT_CC1, ENABLE);       //ÔêDí¸üDÂÖD¶Ï ,ÔêDíCC1IE2¶»ñÖD¶Ï
   TIM_ITConfig(TIM4, TIM_IT_CC2, ENABLE);
   TIM_ITConfig(TIM4, TIM_IT_CC3, ENABLE);
   TIM_ITConfig(TIM4, TIM_IT_CC4, ENABLE);

}
/*====================================================================================================*/
/*====================================================================================================*
**oˉêy : TIM4_IRQHandler
**1|Äü : TIM4ÖD¶Ï·tÎñ
**êäèë : None
**Y”3ö : None
**±¸×￠ : None
**====================================================================================================*/
/*====================================================================================================*/
void TIM4_IRQHandler(void)
{
   if (TIM_GetITStatus(TIM4, TIM_IT_CC1) != RESET)          //2¶»ñ1·￠éú2¶»ñêÂ¼t
{


TIM_ClearITPendingBit(TIM4, TIM_IT_CC1); //Çå3yÖD¶Ï±êÖ¾Î»
if(GPIO_ReadInputDataBit(GPIO_TIM4,TIM4_CH1) == 1)
{
   TIM_OC1PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC1P=1 éèÖÃÎaÏÂ½μÑØ2¶»ñ
      d=TIM_GetCapture1(TIM4);
   }
else
{
LED_Init();
   TIM_OC1PolarityConfig(TIM4,TIM_ICPolarity_Rising); //CC1P=0 éèÖÃÎaéÏéyÑØ2¶»ñ
      d=TIM_GetCapture1(TIM4);
   if(Rise[0]>Drop[0]) RC_Pwm_In[0] = 65535-Rise[0] + Drop[0];
else                RC_Pwm_In[0] = Drop[0] - Rise[0];
   }
}


if (TIM_GetITStatus(TIM4, TIM_IT_CC2) != RESET) //2¶»ñ1·￠éú2¶»ñêÂ¼t
{ //LED_Init();
TIM_ClearITPendingBit(TIM4, TIM_IT_CC2); //Çå3yÖD¶Ï±êÖ¾Î»
if(GPIO_ReadInputDataBit(GPIO_TIM4,TIM4_CH2) == 1)
{
   TIM_OC2PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC1P=1 éèÖÃÎaÏÂ½μÑØ2¶»ñ
      //d=TIM_GetCapture2(TIM4);
   }
/* else
{
   TIM_OC2PolarityConfig(TIM4,TIM_ICPolarity_Rising); //CC1P=0 éèÖÃÎaéÏéyÑØ2¶»ñ
      d=TIM_GetCapture2(TIM4);
   if(Rise[1]>Drop[1])  RC_Pwm_In[1] = 65535-Rise[1] + Drop[1];
else                RC_Pwm_In[1] = Drop[1] - Rise[1];
   } */
}

if (TIM_GetITStatus(TIM4, TIM_IT_CC3) != RESET)          //2¶»ñ1·￠éú2¶»ñêÂ¼t
{
TIM_ClearITPendingBit(TIM4, TIM_IT_CC3); //Çå3yÖD¶Ï±êÖ¾Î»
if(GPIO_ReadInputDataBit(GPIO_TIM4,TIM4_CH3) == 1)
{
   TIM_OC3PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC1P=1 éèÖÃÎaÏÂ½μÑØ2¶»ñ
      Rise[2]=TIM_GetCapture3(TIM4);
   }
else
{
   TIM_OC3PolarityConfig(TIM4,TIM_ICPolarity_Rising); //CC1P=0 éèÖÃÎaéÏéyÑØ2¶»ñ
      Drop[2]=TIM_GetCapture3(TIM4);
   if(Rise[2]>Drop[2]) RC_Pwm_In[2] = 65535-Rise[2] + Drop[2];
else                RC_Pwm_In[2] = Drop[2] - Rise[2];
   }
}

if (TIM_GetITStatus(TIM4, TIM_IT_CC4) != RESET)          //2¶»ñ1·￠éú2¶»ñêÂ¼t
{
TIM_ClearITPendingBit(TIM4, TIM_IT_CC4); //Çå3yÖD¶Ï±êÖ¾Î»
   if(GPIO_ReadInputDataBit(GPIO_TIM4,TIM4_CH4) == 1)
{
   TIM_OC4PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC1P=1 éèÖÃÎaÏÂ½μÑØ2¶»ñ
      Rise[3]=TIM_GetCapture4(TIM4);
   }
else
{
   TIM_OC4PolarityConfig(TIM4,TIM_ICPolarity_Rising); //CC1P=0 éèÖÃÎaéÏéyÑØ2¶»ñ
      Drop[3]=TIM_GetCapture4(TIM4);
   if(Rise[3]>Drop[3])  RC_Pwm_In[3] = 65535-Rise[3] + Drop[3];
else                RC_Pwm_In[3] = Drop[3] - Rise[3];
   }
}
}