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- 2021-3-13
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1金钱
#include "wave.h"
#include "sys.h"
#include "delay.h"
#include "usart.h"
#define Trig GPIO_Pin_4//éèÖÃòy½Å4Îa3¬éù2¨μÄ·¢Ëíòy½Å
#define Echo GPIO_Pin_6//éèÖÃòy½Å6Îa3¬éù2¨μĽóêüòy½Å
float Distance;
void Wave_SRD_Init(void)
{
GPIO_InitTypeDef GPIO_InitSture;
EXTI_InitTypeDef EXTI_InitSture;
NVIC_InitTypeDef NVIC_InitSture;
//èç1ûía2¿ÖD¶ÏμÄ»°Ôòò»¶¨ê1ÄüAFIO¸′óÃ1|Äü
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOE,ENABLE);
//ÅäÖÃIO¶Ë¿ú
GPIO_InitSture.GPIO_Mode=GPIO_Mode_Out_PP; //íÆíìêä3öÄ£ê½
GPIO_InitSture.GPIO_Pin=Trig; //½« E4óúTrigÏàá¬
GPIO_InitSture.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOE,&GPIO_InitSture);
GPIO_InitSture.GPIO_Mode=GPIO_Mode_IPD; //à-êäèëÄ£ê½
GPIO_InitSture.GPIO_Pin=Echo; //½« E6óúEchoÏàá¬
GPIO_InitSture.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOE,&GPIO_InitSture);
//ÖD¶Ïoí6¶Ë¿úó3éäò»Æe
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource6);
//ía2¿ÖD¶ÏÅäÖÃ
EXTI_InitSture.EXTI_Line=EXTI_Line6;
EXTI_InitSture.EXTI_LineCmd=ENABLE;
EXTI_InitSture.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitSture.EXTI_Trigger=EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitSture);
//ÖD¶ÏóÅÏè¼¶1üàí
NVIC_InitSture.NVIC_IRQChannel=EXTI9_5_IRQn;
NVIC_InitSture.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitSture.NVIC_IRQChannelPreemptionPriority=2;
NVIC_InitSture.NVIC_IRQChannelSubPriority=2;
NVIC_Init(&NVIC_InitSture);
}
//ía2¿ÖD¶Ï·tÎñoˉêy
void EXTI9_5_IRQHandler(void)
{
delay_us(10);
if(EXTI_GetITStatus(EXTI_Line6)!=RESET)
{
TIM_SetCounter(TIM3,0);
TIM_Cmd(TIM3,ENABLE);
while(GPIO_ReadInputDataBit(GPIOE,Echo)); //μè′yμíμçÆ½
TIM_Cmd(TIM3,DISABLE);
Distance=TIM_GetCounter(TIM3)*340/200.0;
if(Distance>0)
{
printf("Distance:%f cm\r\n",Distance);
delay_ms(20);
}
EXTI_ClearITPendingBit(EXTI_Line6);
}
}
//3¬éù2¨′¥·¢ìõ¼toˉêy
void Wave_SRD_Strat(void)
{
GPIO_SetBits(GPIOE,Trig); //½«TrigéèÖÃÎa¸ßμçÆ½
delay_us(20); //3ÖDø′óóú10us′¥·¢£¬′¥·¢3¬éù2¨Ä£¿é1¤×÷
GPIO_ResetBits(GPIOE,Trig);
}
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