stm32超聲波測(cè)距程序

1、精選優(yōu)質(zhì)文檔-傾情為你奉上單片機(jī)用的是STM32F103VC系列，超聲波是淘寶買的一個(gè)模塊，只有5個(gè)引腳，用起來很方便。用的時(shí)候只需要其中4個(gè)腳，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();/定時(shí)器初始化函數(shù)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);/拉高超過10us，發(fā)射超聲波GPIO_ResetBits(GPIOA,GPIO_Pin_8); TIM2->CNT=0;/計(jì)數(shù)器清0while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_9)=0);/等待ECHO腳高電平 TIM_Cmd(TIM2, ENABLE);/ TIM2 enable cou

4、nter 允許tim2計(jì)數(shù) while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_9)=1)&&(TIM2->CNT<TIM2->ARR-10); TIM_Cmd(TIM2, DISABLE); count=TIM2->CNT;/ECHO腳低電平后讀取計(jì)數(shù)器的值，從而算出往返時(shí)間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);/復(fù)位TIM2定時(shí)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