STM32F4单片机TIM12做输入捕获的问题

qinshou

各位大神，你们是否有遇到过使用TIM9或者TIM12做输入捕获实验呢？我最近在做TIM12做输入捕获实验，发现TIM12输入捕获中断可以进去，但是计数值始终不变，例程如下：

void TIM12_CH1_Cap_Init(uint16_t arr,uint16_t psc)
{
TIM_ICInitTypeDef  TIM12_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM12,ENABLE);   //TIM5ʱÖÓʹÄÜ   
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); /* PA0,PA12-> ×óÓÒÂö³åÊäÈë */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14; //GPIOA0
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸´Óù¦ÄÜ
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //ËÙ¶È100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //ÍÆÍ츴ÓÃÊä³ö
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; //ÏÂÀ­
GPIO_Init(GPIOB,&GPIO_InitStructure); //³õʼ»&macrA0
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_TIM12); //PA0¸´ÓÃλ¶¨Ê±Æ÷5
  
   
TIM_TimeBaseStructure.TIM_Prescaler=psc;  //¶¨Ê±Æ÷·ÖƵ
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //ÏòÉϼÆÊýģʽ
TIM_TimeBaseStructure.TIM_Period=arr;   //×Ô¶¯ÖØ×°ÔØÖµ
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

TIM_TimeBaseInit(TIM12,&TIM_TimeBaseStructure);

//³õʼ»¯TIM5ÊäÈ벶»ñ²ÎÊý
TIM11_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01  Ñ¡ÔñÊäÈë¶Ë IC1Ó³Éäµ½TI1ÉÏ
    TIM11_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //ÉÏÉýÑز¶»ñ
    TIM11_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //Ó³Éäµ½TI1ÉÏ
    TIM11_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;  //ÅäÖÃÊäÈë·ÖƵ,²»·ÖƵ
    TIM11_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 ÅäÖÃÊäÈëÂ˲¨Æ÷ ²»Â˲¨

    TIM_ICInit(TIM12, &TIM12_ICInitStructure);
  
TIM_ITConfig(TIM12,TIM_IT_Update|TIM_IT_CC1,ENABLE);//ÔÊÐí¸üÐÂÖÐ¶Ï ,ÔÊÐíCC1IE²¶»ñÖжÏ

    TIM_Cmd(TIM12,ENABLE );  //ʹÄܶ¨Ê±Æ÷5
TIM_OC1PolarityConfig(TIM12,TIM_ICPolarity_Rising); //CC1P=0 ÉèÖÃΪÉÏÉýÑز¶»ñ

NVIC_InitStructure.NVIC_IRQChannel = TIM8_BRK_TIM12_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//ÇÀÕ¼ÓÅÏȼ¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =2;  //×ÓÓÅÏȼ¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   //IRQͨµÀʹÄÜ
NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õʼ»¯VIC¼Ä´æÆ÷¡¢

}



void TIM8_BRK_TIM12_IRQHandler(void)
{      
if(TIM_GetITStatus(TIM12, TIM_IT_CC1) != RESET)//²¶»ñ1·¢Éú²¶»ñʼþ
{
  TIM12CH1_CAPTURE_VAL+=1;////Âö³åÀÛ¼Ó.
}                     
  
TIM_ClearITPendingBit(TIM12, TIM_IT_CC1|TIM_IT_Update); //Çå³ýÖжϱê־λ
}

qinshou

问题解决了

qinshou

有人看吗？

翼行园子

仿真去找问题   直接在中断函数打断点  Watch窗口 去看下计数值  

qinshou

翼行园子 发表于 2019-8-26 17:29
仿真去找问题   直接在中断函数打断点  Watch窗口 去看下计数值

仿真的结果时输入捕获驱动配置不进去，配置的值不是仿真出来的值

15025420415

qinshou 发表于 2019-8-26 15:55
问题解决了

请问问题出在什么地方啊

刘ZC

把 TIM12CH1_CAPTURE_VAL设置为静态变量吧