stm32f103ze通用定时器测频率和占空比。

只看该作者 · 2015-11-26 22:20

初始化配置如下
TIM_ICInitTypeDef  TIM5_ICInitStructure;

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 Çå³ýÖ®Ç°ÉèÖÃ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 ÊäÈë
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_0);    //PA0 ÏÂÀ

//³õÊ¼»¯¶¨Ê±Æ÷5 TIM5
TIM_TimeBaseStructure.TIM_Period = arr; //Éè¶¨¼ÆÊýÆ÷×Ô¶¯ÖØ×°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;  //TIMÏòÉÏ¼ÆÊýÄ£Ê½
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //¸ù¾ÝTIM_TimeBaseInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯TIMxµÄÊ±¼ä»ùÊýµ¥Î»

//³õÊ¼»¯TIM5ÊäÈë²¶»ñ²ÎÊý
TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 Ñ¡ÔñÊäÈë¶Ë IC1Ó³Éäµ½TI1ÉÏ
    TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //ÉÏÉýÑØ²¶»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);

//ÖÐ¶Ï·Ö×é³õÊ¼»¯
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;  //TIM3ÖÐ¶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);  //¸ù¾ÝNVIC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯ÍâÉèNVIC¼Ä´æÆ÷

TIM_ITConfig(TIM5,TIM_IT_CC1,ENABLE);//TIM_IT_Update|ÔÊÐí¸üÐÂÖÐ¶Ï ,ÔÊÐíCC1IE²¶»ñÖÐ¶Ï

   TIM_Cmd(TIM5,ENABLE ); //Ê¹ÄÜ¶¨Ê±Æ÷5

}

只看该作者 · 2015-11-26 22:21

把中断贴出来，求大侠，测频率不准，占空比严重错误。

u8  TIM5CH1_CAPTURE_STA=0; //ÊäÈë²¶»ñ×´Ì¬
u16 TIM5CH1_CAPTURE_VAL1=0; //ÊäÈë²¶»ñÖµ
u16 TIM5CH1_CAPTURE_VAL2=0; //ÊäÈë²¶»ñÖµ
u8 duty=0;
u32 fre=0;

//¶¨Ê±Æ÷5ÖÐ¶Ï·þÎñ³ÌÐò
void TIM5_IRQHandler(void)
{
if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//²¶»ñ1·¢Éú²¶»ñÊÂ¼þ
{
if(TIM5CH1_CAPTURE_STA&0X40) //²¶»ñµ½Ò»¸öÏÂ½µÑØ
{
TIM5CH1_CAPTURE_STA=0; //±ê¼Ç³É¹¦²¶»ñµ½Ò»´ÎÉÏÉýÑØ
TIM5CH1_CAPTURE_VAL1=TIM_GetCapture1(TIM5);
   TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=0 ÉèÖÃÎªÉÏÉýÑØ²¶»ñ
}else    //»¹Î´¿ªÊ¼,µÚÒ»´Î²¶»ñÉÏÉýÑØ
{ TIM5CH1_CAPTURE_VAL2=TIM_GetCapture1(TIM5);

duty=TIM5CH1_CAPTURE_VAL1*100/TIM5CH1_CAPTURE_VAL2;
fre=1000000/TIM5CH1_CAPTURE_VAL2;
LCD_ShowString(12,160,200,16,16,"T5 Fre:    Hz,Duty: %");
LCD_ShowNum(68,160,fre,7,16);
LCD_ShowNum(188,160,duty,3,16);

// TIM5CH1_CAPTURE_STA=0; //Çå¿Õ
TIM5CH1_CAPTURE_VAL1=0;
TIM5CH1_CAPTURE_VAL2=0;
     TIM_SetCounter(TIM5,0);
TIM5CH1_CAPTURE_STA|=0X40; //±ê¼Ç²¶»ñµ½ÁËÉÏÉýÑØ
   TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //CC1P=1 ÉèÖÃÎªÏÂ½µÑØ²¶»ñ
}
}
TIM_ClearITPendingBit(TIM5, TIM_IT_CC1);//|TIM_IT_Update); //Çå³ýÖÐ¶Ï±êÖ¾Î»
}