F103的TIM5_CH2测方波低电平时间

CortexMaxMin · 发表于 2018-4-10 16:19:43

我的这个程序是按照原子哥的例程改的，但为啥数据不对呢？请教原子哥和各位大神。
初始化：
void TIM5_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE); //ê1ÄüTIM5ê±Öó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);  //ê1ÄüGPIOAê±Öó

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;  //PA0 Çå3yÖ®Ç°éèÖÃ
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD; //PA0 êäèë
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_0);    //PA0 ÏÂà-

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD; //ÏÂà-
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_1);    ////PA1

//3õê¼»ˉ¶¨ê±Æ÷5 TIM5
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(TIM5,&TIM_TimeBaseStructure); //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥Î»

//3õê¼»ˉTIM5êäèë2¶»ñ2Îêy
   TIM5_ICInitStructure.TIM_Channel=TIM_Channel_1; //CC1S=01 Ñ¡Ôñêäèë¶Ë IC1ó3éäμ½TI1éÏ
    TIM5_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Rising; //éÏéyÑØ2¶»ñ/////
    TIM5_ICInitStructure.TIM_ICSelection=TIM_ICSelection_DirectTI; //ó3éäμ½TI1éÏ
    TIM5_ICInitStructure.TIM_ICPrescaler=TIM_ICPSC_DIV1;    //ÅäÖÃêäèë·ÖÆμ,2»·ÖÆμ
    TIM5_ICInitStructure.TIM_ICFilter=0x00;//IC1F=0000 ÅäÖÃêäèëÂË2¨Æ÷ 2»ÂË2¨
    TIM_ICInit(TIM5,&TIM5_ICInitStructure);

   TIM5_ICInitStructure.TIM_Channel=TIM_Channel_2;
TIM5->CCMR1|=1<<8; //CC2通道被配置为输入，IC2映射在TI2上；
TIM5->CCMR1|=0<<12 ;//IC2F=0000,无滤波
TIM5->CCMR1|=0<<10; //不分频
TIM5->CCER|=1<<4;  //捕获2使能
TIM5_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Falling;//CH2 ÏÂ½μÑØ2¶»ñ
   TIM_ICInit(TIM5,&TIM5_ICInitStructure);

//ÖD¶Ï·Ö×é3õê¼»ˉ
NVIC_InitStructure.NVIC_IRQChannel=TIM5_IRQn;  //TIM5ÖD¶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(TIM5,TIM_IT_Update|TIM_IT_CC1|TIM_IT_CC2,ENABLE);//ÔêDí¸üDÂÖD¶Ï ,ÔêDíCC1IE,CC2IE2¶»ñÖD¶Ï
TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC2,ENABLE);
  TIM_Cmd(TIM5,ENABLE); //ê1Äü¶¨ê±Æ÷5

}

中断：（这里屏蔽了CH1的）
//¶¨ê±Æ÷5ÖD¶Ï·tÎñ3ìDò
void TIM5_IRQHandler(void)
{
//CH1
/*if((TIM5CH1_CAPTURE_STA&0X80)==0)//»1Î′3é1|2¶»ñ
{

   if(TIM_GetITStatus(TIM5, TIM_IT_Update)!=RESET)
{
if(TIM5CH1_CAPTURE_STA&0X40)//òÑ¾-2¶»ñμ½¸ßμçÆ½áË
{
if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)//¸ßμçÆ½ì«3¤áË
{
TIM5CH1_CAPTURE_STA|=0X80;//±ê¼Ç3é1|2¶»ñáËò»′Î¸ßμçÆ½
TIM5CH1_CAPTURE_VAL=0XFFFF;
}else TIM5CH1_CAPTURE_STA++;
}
}

if(TIM_GetITStatus(TIM5,TIM_IT_CC1)!=RESET)//2¶»ñ1·￠éú2¶»ñêÂ¼t
{

if(TIM5CH1_CAPTURE_STA&0x40)// //2¶»ñμ½ò»¸öÏÂ½μÑØ
{
TIM5CH1_CAPTURE_STA|=0X80;    //±ê¼Ç3é1|2¶»ñμ½ò»′Î¸ßμçÆ½Âö¿í
TIM5CH1_CAPTURE_VAL=TIM5->CCR1; //2¶»ñÖμ
TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=0 éèÖÃÎaéÏéyÑØ2¶»ñ
}
else    //»1Î′¿aê¼,μúò»′Î2¶»ñéÏéyÑØ
{
TIM5CH1_CAPTURE_STA=0; //Çå¿Õ
TIM5CH1_CAPTURE_VAL=0;
TIM5->CNT=0;
TIM5CH1_CAPTURE_STA|=0X40; //±ê¼Ç2¶»ñμ½áËéÏéyÑØ
   TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //CC1P=1 éèÖÃÎaÏÂ½μÑØ2¶»ñ
}

}
}*/
//----------CH2:

if((TIM5CH2_CAPTURE_STA&0X80)==0)//»1Î′3é1|2¶»ñ
{

if(TIM_GetITStatus(TIM5,TIM_IT_Update)!=RESET)
{
if(TIM5CH2_CAPTURE_STA&0X40)//òÑ¾-2¶»ñμ½ μíμçÆ½áË
{
if((TIM5CH2_CAPTURE_STA&0X3F)==0X3F)//μíμçÆ½ì«3¤áË
{
TIM5CH2_CAPTURE_STA|=0X80;//±ê¼Ç3é1|2¶»ñáËò»′ÎdiμçÆ½
TIM5CH2_CAPTURE_VAL=0XFFFF;
}else TIM5CH2_CAPTURE_STA++;
}
}

if(TIM_GetITStatus(TIM5,TIM_IT_CC2)!=RESET)//2¶»ñ2·￠éú2¶»ñêÂ¼t
{

if((TIM5CH1_CAPTURE_STA&0x40)==0)// //2¶»ñμ½ò»¸ö éÏéyÑØ
{
   LED1=1;
TIM5CH2_CAPTURE_STA|=0X80;    //±ê¼Ç3é1|2¶»ñμ½ò»′ÎdiμçÆ½Âö¿í
// TIM5CH2_CAPTURE_VAL=TIM5->CCR2-TIM5CH1_CAPTURE_VAL; //2¶»ñdiμçÆ½Öμ
TIM5CH2_CAPTURE_VAL=TIM5->CCR2;
TIM_OC2PolarityConfig(TIM5,TIM_ICPolarity_Falling); //éèÖÃÎaÏÂ½μÑØ2¶»ñ
}
else    //»1Î′¿aê¼,μúò»′Î2¶»ñ  ÏÂ½μÑØ
{
      LED1=0;
TIM5CH2_CAPTURE_STA=0; //Çå¿Õ
TIM5CH2_CAPTURE_VAL=0;
TIM5->CNT=0;
TIM5CH2_CAPTURE_STA|=0X40; //±ê¼Ç2¶»ñμ½áËÏÂ½μÑØ
   TIM_OC2PolarityConfig(TIM5,TIM_ICPolarity_Rising); //éèÖÃÎaéÏéyÑØ2¶»ñ
}

}
}

//TIM_ClearITPendingBit(TIM5,TIM_IT_CC1|TIM_IT_Update|TIM_IT_CC2); //Çå3yÖD¶Ï±êÖ¾Î»
TIM_ClearITPendingBit(TIM5,TIM_IT_Update|TIM_IT_CC2); //Çå3yÖD¶Ï±êÖ¾Î»
}
////////////

主函数里：
while(1)
{
delay_ms(300);

/*if(TIM5CH1_CAPTURE_STA&0X80)//3é1|2¶»ñμ½áËò»′ÎéÏéyÑØ
{
high=TIM5CH1_CAPTURE_STA&0X3F;//μíáùÎ»Îaòç3ö′Îêy
high*=65536;//òç3öê±¼ä×üoí//ò»′Îòç3öê±¼äÎa65536us,óDTIM5CH1_CAPTURE_STA&0X3F′Îòç3ö
high+=TIM5CH1_CAPTURE_VAL;//μÃμ½×üμÄ¸ßμçÆ½ê±¼ä
printf("HIGH:%.3Lf us\r\n",high);//′òó¡×üμÄ¸ßμçÆ½ê±¼ä
TIM5CH1_CAPTURE_STA=0;//¿aÆôÏÂò»′Î2¶»ñ
}*/

if(TIM5CH2_CAPTURE_STA&0X80)//3é1|2¶»ñμ½áËò»′ÎéÏéyÑØ
{
printf("%d",TIM5CH2_CAPTURE_VAL);
low=TIM5CH2_CAPTURE_STA&0X3F;//μíáùÎ»Îaòç3ö′Îêy
low*=65536;//òç3öê±¼ä×üoí//ò»′Îòç3öê±¼äÎa65536us,óDTIM5CH1_CAPTURE_STA&0X3F′Îòç3ö
low+=TIM5CH2_CAPTURE_VAL;//μÃμ½×üμÄ¸ßμçÆ½ê±¼ä
printf("--LOW:%.3Lf us\r\n",low);//′òó¡×üμÄ¸ßμçÆ½ê±¼ä
TIM5CH2_CAPTURE_STA=0;//¿aÆôÏÂò»′Î2¶»ñ
}

}

CortexMaxMin · 发表于 2018-4-10 16:21:26

我发现应该是计数器没清零，但还是没找到问题

正点原子 · 发表于 2018-4-11 01:14:41

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F103的TIM5_CH2测方波低电平时间

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