超声波测距源码STM32

【实例简介】超声波测距源码关于STM32的源码
【实例截图】
【核心代码】#include "delay.h"
#include "uw.h"


uint overcount=0;


void CH_SR04_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructer;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructer;
NVIC_InitTypeDef NVIC_InitStructer;

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

/*TRIG*/
GPIO_InitStructer.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructer.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructer.GPIO_Pin=GPIO_Pin_6;
GPIO_Init(GPIOB, &GPIO_InitStructer);

/*ECOH*/
GPIO_InitStructer.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructer.GPIO_Pin=GPIO_Pin_9;
GPIO_Init(GPIOB, & GPIO_InitStructer);

/*TIM2*/
TIM_DeInit(TIM2);
TIM_TimeBaseInitStructer.TIM_Period=999;
TIM_TimeBaseInitStructer.TIM_Prescaler=71; 
TIM_TimeBaseInitStructer.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInitStructer.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructer);

//TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE );
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE );

NVIC_InitStructer.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStructer.NVIC_IRQChannelSubPriority=0;
NVIC_InitStructer.NVIC_IRQChannel=TIM2_IRQn;
NVIC_InitStructer.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructer);

TIM_Cmd(TIM2, DISABLE);
}



float Senor_Using(void) //·µ»Ø¾àÀëÖµ
{
float length=0,sum=0;
u16 tim;
uint i=0;

while(i!=5)
{
PBout(6)=1; 
delay_us(20); 
PBout(6)=0;

while(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_9)==RESET);
TIM_Cmd(TIM2,ENABLE);

i =1;
while(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_9)==SET);
TIM_Cmd(TIM2,DISABLE);

tim=TIM_GetCounter(TIM2);

length=(tim overcount*1000)/58.0;
//length=(tim overcount*1000)*0.0001*340/2;
sum=length sum;
TIM2->CNT=0; 
overcount=0; 
//delay_ms(100);
}
length=sum/5;
return length;
}


void TIM2_IRQHandler(void) 
{
if(TIM_GetITStatus(TIM2,TIM_IT_Update)!=RESET)
{
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
overcount ;

  }
}