stm32超声波测距程序

1、精选优质文档-倾情为你奉上单片机用的是STM32F103VC系列，超声波是淘宝买的一个模块，只有5个引脚，用起来很方便。用的时候只需要其中4个脚，VCC,GND,TRIG,ECHO。 TRIG接PA8,OUT_PP模式；ECHO接PA9,IN_FLOATING模式。 #include "stm32f10x_heads.h"#include "HelloRobot.h"#include "display.h" void Tim2_Init(void); void TIM2_IRQHandler(void)i

2、f(GPIO_ReadInputDataBit(GPIOE,GPIO_Pin_12)=0)GPIO_SetBits(GPIOE,GPIO_Pin_12);elseGPIO_ResetBits(GPIOE,GPIO_Pin_12);  TIM_ClearFlag(TIM2, TIM_FLAG_Update); int main(void)u16 count;float length;BSP_Init();Tim2_Init();/定时器初始化函数LCM_Init();delay_nms(5);GPIO_ResetBits(GPIOA,GPIO_Pin_8);Disp

3、lay_List_Char(1,0,"distance:"); /PA8:Trig PA0:Echo while (1)GPIO_SetBits(GPIOA,GPIO_Pin_8);delay_nus(20);/拉高超过10us，发射超声波GPIO_ResetBits(GPIOA,GPIO_Pin_8); TIM2->CNT=0;/计数器清0while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_9)=0);/等待ECHO脚高电平 TIM_Cmd(TIM2, ENABLE);/ TIM2 enable cou

4、nter 允许tim2计数 while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_9)=1)&&(TIM2->CNT<TIM2->ARR-10); TIM_Cmd(TIM2, DISABLE); count=TIM2->CNT;/ECHO脚低电平后读取计数器的值，从而算出往返时间length=count/58.0;Display_List_Char(1,9," ");Display_List_Float(1,9,length);delay_nms(200); vo

5、id Tim2_Init(void)TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_DeInit(TIM2);/复位TIM2定时器TIM_TimeBaseStructure.TIM_Period = 49999;TIM_TimeBaseStructure.TIM_Prescaler = 71;TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBaseInit(TIM2, & TIM_TimeBaseStructure); TIM_ClearFla