我现在正在做小车测速，用的是外部脉冲计数，计数值始终显示是0，求助

钻石徐老二

帮忙看一下，做了一天了，始终没找到毛病，比较急，谢谢了，


#include "CE_SU.h"
#include "led.h"
#include "usart.h"


void TIM3_cesu_Init(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        TIM_TimeBaseInitTypeDef   TIM_TimeBaseStructure;

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOD, &GPIO_InitStructure);
       
  TIM_DeInit(TIM3);
  TIM_TimeBaseStructure.TIM_Period =0xFFFF;       
        TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

        TIM_ClearFlag(TIM3, TIM_FLAG_Update);       
        TIM_ETRClockMode2Config(TIM3, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
        TIM_SetCounter(TIM3, 0);
        TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
        TIM_Cmd(TIM3, ENABLE);
}




void TIM6_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);

        TIM_TimeBaseStructure.TIM_Period = arr;
        TIM_TimeBaseStructure.TIM_Prescaler =psc;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
        TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);

        TIM_ITConfig( TIM6, TIM_IT_Update ,ENABLE  );
        NVIC_InitStructure.NVIC_IRQChannel = TIM6_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);

        TIM_Cmd(TIM6, ENABLE);
                                                         
}


u16        TIM3_CAPTURE_VAL;
float speed;

void TIM6_IRQHandler(void)  
{
        TIM_Cmd(TIM3, DISABLE);
       
       
        if (TIM_GetITStatus(TIM6, TIM_IT_Update) != RESET)
                {
                       
               
                TIM_ClearITPendingBit(TIM6, TIM_IT_Update);  
                TIM3_CAPTURE_VAL=TIM_GetCounter(TIM3);               
                speed=TIM3_CAPTURE_VAL;       
               
     TIM_SetCounter(TIM3,0);
               
                       
                }
               
               
                TIM_Cmd(TIM3, ENABLE);
}

xyl210xyl

两点，你中断里怎么写，还有smcr的寄存器值配进去了没，仿真查看该寄存器值是不是按手册说明的控制值

龙战云野

我现在在做PID电机调速，你这个问题很简单，一个定时中断，一个外部中断就OK了。
外部中断：
#include "exti.h"
#include "led.h"
#include "key.h"
#include "delay.h"
#include "usart.h"

//////////////////////////////////////////////////////////////////////////////////         
//±¾3ìDòÖ»1©Ñ§Ï°ê1óÃ￡¬Î′¾-×÷ÕßDí¿é￡¬2»μÃóÃóúÆäËüèÎoÎóÃí¾
//Mini STM32¿a·￠°å
//ía2¿ÖD¶Ï Çy¶ˉ′úÂë                          
//ÕyμãÔ-×ó@ALIENTEK
//¼¼êõÂÛì3:www.openedv.com
//DT¸ÄèÕÆú:2010/12/01  
//°æ±¾￡oV1.0
//°æè¨ËùóD￡¬μá°æ±Ø¾¿¡￡
//Copyright(C) ÕyμãÔ-×ó 2009-2019
//All rights reserved          
//////////////////////////////////////////////////////////////////////////////////           

extern unsigned int s1;
extern unsigned int s2;
//ía2¿ÖD¶Ï3õê¼»ˉoˉêy
void EXTIX_Init(void)
{

          EXTI_InitTypeDef EXTI_InitStructure;
          NVIC_InitTypeDef NVIC_Initok;

          RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);//ía2¿ÖD¶Ï￡¬Dèòaê1ÄüAFIOê±Öó

          KEY_Init();//3õê¼»ˉ°′¼ü¶Ôó|ioÄ￡ê½

    //GPIOA.0          ÖD¶ÏÏßòÔ¼°ÖD¶Ï3õê¼»ˉÅäÖÃ
          GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);

           EXTI_InitStructure.EXTI_Line=EXTI_Line0;
          EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;       
          EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
          EXTI_InitStructure.EXTI_LineCmd = ENABLE;
          EXTI_Init(&EXTI_InitStructure);                //¸ù¾YEXTI_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèEXTI¼Ä′æÆ÷

          NVIC_Initok.NVIC_IRQChannel = EXTI0_IRQn;                        //ê1Äü°′¼üËùÔúμÄía2¿ÖD¶Ïí¨μà
          NVIC_Initok.NVIC_IRQChannelPreemptionPriority = 0x02;        //ÇàÕ¼óÅÏ輶2
          NVIC_Initok.NVIC_IRQChannelSubPriority = 0x02;                                        //×óóÅÏ輶1
          NVIC_Initok.NVIC_IRQChannelCmd = ENABLE;                                                                //ê1Äüía2¿ÖD¶Ïí¨μà
          NVIC_Init(&NVIC_Initok);            //¸ù¾YNVIC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèNVIC¼Ä′æÆ÷
//GPIOC.5 ÖD¶ÏÏßòÔ¼°ÖD¶Ï3õê¼»ˉÅäÖÃ
          GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource5);

          EXTI_InitStructure.EXTI_Line=EXTI_Line5;
          EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;       
          EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//ϽμÑØ′￥·￠
          EXTI_InitStructure.EXTI_LineCmd = ENABLE;
          EXTI_Init(&EXTI_InitStructure);                 //¸ù¾YEXTI_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèEXTI¼Ä′æÆ÷

                NVIC_Initok.NVIC_IRQChannel = EXTI9_5_IRQn;                        //ê1Äü°′¼üËùÔúμÄía2¿ÖD¶Ïí¨μà
          NVIC_Initok.NVIC_IRQChannelPreemptionPriority = 0x02;        //ÇàÕ¼óÅÏ輶2￡¬
          NVIC_Initok.NVIC_IRQChannelSubPriority = 0x01;                                        //×óóÅÏ輶1
          NVIC_Initok.NVIC_IRQChannelCmd = ENABLE;                                                                //ê1Äüía2¿ÖD¶Ïí¨μà
          NVIC_Init(&NVIC_Initok);

        }


void EXTI0_IRQHandler(void)
{
s1=s1+1;

        EXTI_ClearITPendingBit(EXTI_Line0);  //Çå3yEXTI0Ïß·1òÆeλ
}

void EXTI9_5_IRQHandler(void)
{                       
        s2=s2+1;
         EXTI_ClearITPendingBit(EXTI_Line5);    //Çå3yLINE5éÏμÄÖD¶Ï±ê־λ  
}
定时中断：
#include "timer.h"
#include "led.h"
  
//í¨óö¨ê±Æ÷ÖD¶Ï3õê¼»ˉ
//Õaàïê±ÖóÑ¡ÔñÎaAPB1μÄ2±¶￡¬¶øAPB1Îa36M
//arr￡o×Ô¶ˉÖØ×°Öμ¡￡
//psc￡oê±ÖóÔ¤·ÖÆμêy
//Õaàïê1óÃμÄêǶ¨ê±Æ÷3!
extern unsigned int k;
//unsigned int s1;
//unsigned int s2;
//extern unsigned int a1;
//extern unsigned int a2;
void TIM3_Int_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //ê±Öóê1Äü

        TIM_TimeBaseStructure.TIM_Period = arr; //éèÖÃÔúÏÂò»¸ö¸üDÂê¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔؼÄ′æÆ÷ÖüÆúμÄÖμ         ¼Æêyμ½5000Îa500ms
        TIM_TimeBaseStructure.TIM_Prescaler =psc; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ  10KhzμļÆêyÆμÂê  
        TIM_TimeBaseStructure.TIM_ClockDivision = 0; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòéϼÆêyÄ￡ê½
        TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥λ

        TIM_ITConfig(  //ê1Äü»òÕßê§ÄüÖ¸¶¨μÄTIMÖD¶Ï
                TIM3, //TIM2
                TIM_IT_Update ,
                ENABLE  //ê1Äü
                );
        NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3ÖD¶Ï
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //ÏèÕ¼óÅÏ輶0¼¶
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //′óóÅÏ輶3¼¶
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
        NVIC_Init(&NVIC_InitStructure);  //¸ù¾YNVIC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèNVIC¼Ä′æÆ÷

        TIM_Cmd(TIM3, ENABLE);  //ê1ÄüTIMxíaéè
                                                         
}

void TIM3_IRQHandler(void)   //TIM3ÖD¶Ï
{
        if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //¼ì2éÖ¸¶¨μÄTIMÖD¶Ï·￠éúóë·ñ:TIM ÖD¶ÏÔ′
                {
                        k++;
                TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //Çå3yTIMxμÄÖD¶Ï′y′|àíλ:TIM ÖD¶ÏÔ′
               
                }
}

外带一句，我做的是两路电机测试的，所以有两个外部中断服务函数

xyl210xyl

龙战云野 发表于 2016-6-15 13:14
我现在在做PID电机调速，你这个问题很简单，一个定时中断，一个外部中断就OK了。
外部中断：
#include "e ...

紧抓寄存器值