输入捕获实验

南辰 · 发表于 2020-12-21 15:49:02

用的是正点原子mini开发板stm32f103RCT6
************main函数**************
#include "sys.h"
#include "delay.h"

#include "led.h"
#include "usart.h"
#include "exti.h"
#include "key.h"
#include "time.h"
#include "pwm.h"
#include "capture.h"

int main(void)
{
u16 i=0;
u32 temp=0;

delay_init();
LED_Init();
KEY_Init();
//My_EXTIX_Init();
//USART1_Init(9600);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);  //ÖÐ¶ÏÓÅÏÈ¼¶·Ö×é ·Ö2×é
//My_TIM3_Init(4999,7199);//Tout=((4999+1)*(7199+1))/72M=500ms
//My_TIM1_PWM_Init(300,0);

My_TIM5_capture_Init(0xffff,71);//Tout=((4999+1)*(71+1))/72M=500ms
//APB1=36M£¬µ±·ÖÆµÏµÊý¡Ù1Ê±£¬ÔòAPB1Ê±ÖÓÆµÂÊx2£¬¹ÊÎª72M

while(1)
{
      //LED0=!LED0;
      //delay_ms(100);//ÏÖÏó£ºLED0ÉÁË¸½Ï¿ì¼ä¸ô100ms£¬LED1ÉÁË¸½ÏÂý¼ä¸ô500ms
      if(TIM5_CH1_CAPTURE_STA&0x80)
      {
         temp=TIM5_CH1_CAPTURE_STA&0x3f;//»ñÈ¡Òç³ö´ÎÊý
         temp*=0xffff;//Òç³öÒ»´ÎÊÇ0xffff Òç³öÊ±¼ä×ÜºÍ
         temp+=TIM5_CH1_CAPTURE_VAL;//×ÜµÄ¸ßµçÆ½³ÖÐøÊ±¼ä
         printf("¸ßµçÆ½³ÖÐøÊ±¼ä£º%d  us\r\n",temp);
         TIM5_CH1_CAPTURE_STA=0;
      }
      i++;
      if(i%20==0)
      {
         LED1=!LED1;
      }

      delay_ms(10);
}

}

********capture.c************
#include "capture.h"
#include "capture.h"

u8 TIM5_CH1_CAPTURE_STA=0;
u16 TIM5_CH1_CAPTURE_VAL=0;

void My_TIM5_capture_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD;//PA0ÏÂÀ
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_ResetBits(GPIOA,GPIO_Pin_0);//PA0ÏÂÀ

TIM_TimeBaseStructure.TIM_Period=arr;
TIM_TimeBaseStructure.TIM_Prescaler=psc;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; // TDTS=Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//ÏòÉÏ¼ÆÊýÄ£Ê½
TIM_TimeBaseInit(TIM5,&TIM_TimeBaseStructure);

TIM_ICInitStructure.TIM_Channel=TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPrescaler=TIM_ICPSC_DIV1;//²»·ÖÆµ
TIM_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection=TIM_ICSelection_DirectTI;//ÅäÖÃIC1Ö±½ÓÓ³Éäµ½TI1ÉÏ
TIM_ICInitStructure.TIM_ICFilter=0x00;//IC1F=0000;ÅäÖÃÊäÈëÂË²¨Æ÷  ²»ÂË²¨
TIM_ICInit(TIM5,&TIM_ICInitStructure);//ÊäÈë²¶»ñ

TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);

NVIC_InitStructure.NVIC_IRQChannel=TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//ÇÀÕ¼ÓÅÏÈ¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;//×ÓÓÅÏÈ¼¶
NVIC_Init(&NVIC_InitStructure);

TIM_Cmd(TIM5,ENABLE);

}

void TIM5_IRQHandler(void)
{
//ÒòÎª¿ªÆôÁË¸üÐÂºÍ²¶»ñÁ½¸öÖÐ¶ÏTIM_IT_Update|TIM_IT_CC1£¬ËùÒÔÊ×ÏÈÒªÅÐ¶ÏÖÐ¶ÏÀàÐÍ
if((TIM5_CH1_CAPTURE_STA&0x80)==0)
{
      if(TIM_GetITStatus(TIM5,TIM_IT_Update)!= RESET)//½øÈë¸üÐÂÖÐ¶Ï
      {
         if(TIM5_CH1_CAPTURE_STA&0x40)//ÅÐ¶Ï´Î¸ßÎ»Îª1
         {
            if((TIM5_CH1_CAPTURE_STA&0x3f)==0x3f)//0x3fÎª0011 1111£¬Òç³ö´ÎÊý³¬¹ý×î´óÖµ
            {
                  TIM5_CH1_CAPTURE_STA|=0X80;//Ç¿ÖÆ²¶»ñÍê³É
                  TIM5_CH1_CAPTURE_VAL=0xffff;//´ËÊ±×î´ó²¶»ñÖµÎª0xffff  (u16ÀàÐÍ)
            }
            else
            {
                  TIM5_CH1_CAPTURE_STA++;
            }
         }
      }

      if(TIM_GetITStatus(TIM5,TIM_IT_CC1)!= RESET)//½øÈë²¶»ñÖÐ¶Ï
      {
         if(TIM5_CH1_CAPTURE_STA&0x40)  //0x40¼´0100 0000£¬´Î¸ßÎ»Îª¸ßµçÆ½²¶»ñ±êÖ¾Î» ÅÐ¶ÏÏàÓëÊÇ·ñµÈÓÚ1
         {
            TIM5_CH1_CAPTURE_STA|=0X80;//0x80¼´1000 0000£¬×î¸ßÎ»Îª²¶»ñÍê³É±êÖ¾Î» TIM5_CH1_CAPTURE_STA=TIM5_CH1_CAPTURE_STA|0X80  ×î¸ßÎ»ÖÃ1
            TIM5_CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);//²¶»ñ±È½Ï¼Ä´æÆ÷µÄÖµ¾ÍÊÇ¼ÆÊýÆ÷µÄÖµ
            TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising);
         }
         else
         {
            TIM5_CH1_CAPTURE_STA=0;//²¶»ñ×´Ì¬Çå0
            TIM5_CH1_CAPTURE_VAL=0;
            TIM5_CH1_CAPTURE_STA|=0X40;//¼´TIM5_CH1_CAPTURE_STA=TIM5_CH1_CAPTURE_STA|0X40 ´Î¸ßÎ»ÖÃ1
            TIM_Cmd(TIM5,DISABLE );//¹Ø±Õ¶¨Ê±Æ÷
            TIM_SetCounter(TIM5,0);//ÉèÖÃ¼ÆÊýÆ÷³õÖµÎª0
            TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);//TIM_OCPolarity_Low¼´ÎªTIM_ICPolarity_Falling£¬¾ùÎª0x0002
            TIM_Cmd(TIM5,ENABLE );
         }
      }
}

TIM_ClearITPendingBit(TIM5,TIM_IT_Update|TIM_IT_CC1);
}

*********capture.h***********
#ifndef _capture_H
#define _capture_H

#include "sys.h"

extern u8 TIM5_CH1_CAPTURE_STA;
extern u16 TIM5_CH1_CAPTURE_VAL;

void My_TIM5_capture_Init(u16 arr,u16 psc);
void TIM5_IRQHandler(void);

#endif