stm32驱动超声波模块
下面是关于stm32驱动超声波模块的一段代码,有需要的朋友可以复制参考,希望对大家能够有所帮助和启发。
#define HCSR04_PORT GPIOB #define HCSR04_CLK RCC_APB2Periph_GPIOB #define HCSR04_TRIG GPIO_Pin_8 #define HCSR04_ECHO GPIO_Pin_9 #define TRIG_Send(n) do{ if(n == 0) GPIO_ResetBits(HCSR04_PORT,HCSR04_TRIG); else if(n == 1) GPIO_SetBits(HCSR04_PORT,HCSR04_TRIG); }while(0) #define ECHO_Reci GPIO_ReadInputDataBit(GPIOB,HCSR04_ECHO) void UltrasonicInit(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(HCSR04_CLK, ENABLE); //IO初始化 GPIO_InitStructure.GPIO_Pin = HCSR04_TRIG; //发送电平引脚 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//推挽输出 GPIO_Init(HCSR04_PORT, &GPIO_InitStructure); GPIO_ResetBits(HCSR04_PORT,HCSR04_TRIG); GPIO_InitStructure.GPIO_Pin = HCSR04_ECHO; //返回电平引脚 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入 GPIO_Init(HCSR04_PORT, &GPIO_InitStructure); GPIO_ResetBits(HCSR04_PORT,HCSR04_ECHO); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; //生成用于定时器设置的结构体 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE); //使能对应RCC时钟 //配置定时器基础结构体 TIM_DeInit(TIM6); TIM_TimeBaseStructure.TIM_Period = (1000-1); //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 计数到1000为1ms TIM_TimeBaseStructure.TIM_Prescaler =(72-1); //设置用来作为TIMx时钟频率除数的预分频值 1M的计数频率 1US计数 TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;//不分频 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式 TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位 TIM_ClearFlag(TIM6, TIM_FLAG_Update); //清除更新中断,免得一打开中断立即产生中断 TIM_ITConfig(TIM6,TIM_IT_Update,ENABLE); //打开定时器更新中断 NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitStructure.NVIC_IRQChannel = TIM6_IRQn; //选择串口1中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占式中断优先级设置为1 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应式中断优先级设置为1 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能中断 NVIC_Init(&NVIC_InitStructure); TIM_Cmd(TIM6,DISABLE); } //定时器6中断服务程序 u32 msHcCount = 0; void TIM6_IRQHandler(void) //TIM6中断 { if (TIM_GetITStatus(TIM6, TIM_IT_Update) != RESET) //检查TIM3更新中断发生与否 { TIM_ClearITPendingBit(TIM6, TIM_IT_Update); //清除TIMx更新中断标志 msHcCount++; } } static void OpenTimerForHc() //打开定时器 { TIM_SetCounter(TIM6,0); //清除计数 msHcCount = 0; TIM_Cmd(TIM6, ENABLE); //使能TIMx外设 } static void CloseTimerForHc() //关闭定时器 { TIM_Cmd(TIM6, DISABLE); //使能TIMx外设 } //获取定时器时间 u32 GetEchoTimer(void) { u32 t = 0; t = msHcCount*1000; //将MS转换成US t += TIM_GetCounter(TIM6); //得到总的US TIM6->CNT = 0; //将TIM6计数寄存器的计数值清零 return t; } //一次获取超声波测距数据 两次测距之间需要相隔一段时间,隔断回响信号 //为了消除余震的影响,取五次数据的平均值进行加权滤波。 float Hcsr04GetLength(void ) { u32 t = 0; int i = 0; float lengthTemp = 0; float sum = 0; while(i!=5) { /*发送一个20ms的脉冲*/ TRIG_Send(1); osDelay(20); TRIG_Send(0); while(ECHO_Reci == 0); //等待接收口高电平输出(超声波发出) OpenTimerForHc(); //打开定时器 while(ECHO_Reci == 1); //等待超声波返回 CloseTimerForHc(); //关闭定时器 t = GetEchoTimer(); //获取时间,分辨率为1US lengthTemp = ((float)t*17/1000.0);//cm sum = lengthTemp + sum ; i = i + 1; } lengthTemp = sum/5.0; return lengthTemp; }
最后在个大家提供一些stm32方面的参考资料
(stm32直流电机驱动)
http://www.makeru.com.cn/live/1392_1218.html?s=45051
(stm32 温湿度采集)
http://www.makeru.com.cn/live/detail/1476.html?s=45051
( ADC读取光照传感器)
http://www.makeru.com.cn/live/1392_1004.html?s=45051
(stm32串口应用)
http://www.makeru.com.cn/live/1392_1164.html?s=45051