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#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "hcsr04.h"
int main(void)
{
float length;
delay_init(); //延時函數(shù)初始化
uart_init(115200); //串口初始化為115200
HCSR04_Init();
printf("超聲波初始化成功");//檢測超聲波是否初始化
length=gettime();
printf("距離為:%.3f cm\n",length);//打印總的距離
}
//以上是主函數(shù)模塊
#include "hcsr04.h"
#include "delay.h"
u16 msHcCount =0;
void HCSR04_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能PB端口時鐘
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //PB.13 端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度為50MHz
GPIO_Init(GPIOB, &GPIO_InitStructure); //根據(jù)設(shè)定參數(shù)初始化GPIOB.13
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14; //PB.14 端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //下拉輸入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度為50MHz
GPIO_Init(GPIOB, &GPIO_InitStructure); //根據(jù)設(shè)定參數(shù)初始化GPIOB.14
//定時器TIM3初始化
TIM_TimeBaseStructure.TIM_Period =10000-1; //設(shè)置在下一個更新事件裝入活動的自動重裝載寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =7200-1; //設(shè)置用來作為TIMx時鐘頻率除數(shù)的預(yù)分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設(shè)置時鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數(shù)模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據(jù)指定的參數(shù)初始化TIMx的時間基數(shù)單位
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中斷,允許更新中斷
//中斷優(yōu)先級NVIC設(shè)置
TIM_ClearFlag(TIM3,TIM_FLAG_Update);
TIM_ITConfig(TIM6,TIM_IT_Update,ENABLE);
hcsr04_NVIC();
TIM_Cmd(TIM3,ENABLE);
}
static void opentimerhc()
{
TIM_SetCounter(TIM2,0);
msHcCount=0;
TIM_Cmd (TIM2,ENABLE);
}
static void closeimerhc()
{
TIM_Cmd(TIM2,DISABLE);
}
void hcsr04_NVIC(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//設(shè)置NVIC中斷分組2:2位搶占優(yōu)先級，2位響應(yīng)優(yōu)先級
// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設(shè)置NVIC中斷分組2:2位搶占優(yōu)先級，2位響應(yīng)優(yōu)先級
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //先占優(yōu)先級1級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //從優(yōu)先級0級
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器
}
void TIM3_IRQHandler(void) //TIM3中斷
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //檢查TIM3更新中斷發(fā)生與否
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx更新中斷標(biāo)志
msHcCount++;
}
}
u32 gettime(void)//時間獲取函數(shù)
{
u32 t=0;
t=msHcCount*1000;
t+=TIM_GetCounter(TIM2);
TIM2->CNT=0;
return t；
delay_ms(50);
}
float hcgetlength(void)
{
u32 t=0;
int i=0;
float lengthTemp=0;
float sum=0;
while(i!=5)
{
GPIO_ResetBits(GPIOB,GPIO_Pin_13); //預(yù)拉低trig引腳
delay_ms(20);
GPIO_SetBits(GPIOB,GPIO_Pin_13);
delay_ms(20);
GPIO_ResetBits(GPIOB,GPIO_Pin_13);//發(fā)出脈沖
while(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14)==0)//等待信號發(fā)出，信號發(fā)出，計數(shù)器置0，同時變?yōu)楦唠娖?br />
{
opentimerhc();
i=i+1;
}
while(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14)==1)//等待信號接收，信號發(fā)出時，引腳一直置1
{
closeimerhc();
t=gettime();
lengthTemp=((float)t*170/1000);
sum=lengthTemp+sum;
}
lengthTemp=sum/5.0;
return lengthTemp;
}
}
這是超聲波模塊
這個就是程序，我不曉得有什么問題，串口助手什么都不說要不就是測不了距離，是我的串口的問題還是，程序問題？
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[復(fù)制鏈接]
