求解超声波F4

hby1997 · 发表于 2017-4-1 18:31:14

这部分是写在UWave.c里的
#define TRIG_PORT    GPIOA  //TRIG
#define ECHO_PORT    GPIOA  //ECHO
#define TRIG_PIN    GPIO_Pin_7 //TRIG
#define ECHO_PIN    GPIO_Pin_0 //ECHO
float UWave_Distance;

void UWave_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

//ÅäÖÃIO¿Ú
GPIO_InitStructure.GPIO_Pin= TRIG_PIN;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_100MHz;
//GPIO_Init(GPIOA,&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin=ECHO_PIN;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_100MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

EXTI_InitStructure.EXTI_Line = EXTI_Line0;//LINE0
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

}

void EXIT0_IRQnHandler(void)
{
//delay_ms(10);

  if(EXTI_GetITStatus(EXTI_Line0)!=RESET)
  {
TIM_SetCounter(TIM2,0);
TIM_Cmd(TIM2,ENABLE);

   while(GPIO_ReadInputDataBit(ECHO_PORT,ECHO_PIN));

   TIM_Cmd(TIM2,DISABLE);
   UWave_Distance=TIM_GetCounter(TIM2)*340/1000/2;

  }
  if(UWave_Distance>10)
  { LED0=!LED0;
LED1=!LED1;
delay_ms(30);
  }
  EXTI_ClearITPendingBit(EXTI_Line4);
}
void UWave_StartMeasure(void)
{
  GPIO_SetBits(TRIG_PORT,TRIG_PIN);
  delay_us(40);
  GPIO_ResetBits(TRIG_PORT,TRIG_PIN);

}
这部分是写在main.c中的
int main(void)
{
extern float UWave_Distance;
delay_init(168);
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
uart_init(115200);
LED_Init();
  TIMER_Init(5000-1,8400-1);
UWave_Init();

while(1)
{
// GPIO_ResetBits(GPIOF,GPIO_Pin_9);
   //GPIO_SetBits(GPIOF,GPIO_Pin_10);
   UWave_StartMeasure();
//printf("%f",UWave_Distance);
   delay_ms(1000);
}
}
然后还有定时器的配置
void TIMER_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseInitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

TIM_TimeBaseInitStructure.TIM_Period=arr;
TIM_TimeBaseInitStructure.TIM_Prescaler=psc;
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure);

TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE); //
TIM_Cmd(TIM2,ENABLE);

NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn; //
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x02;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);

}
void TIM2_IRQHandler(void)
{
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
}
以上是我写的代码，具体思路是利用超声波模块在trig发送一个大于10us的高电平，利用外部中断在ECHO接收高电平的时候发生上升沿中断，我是第一次自己写，写完后MDK5是0Warning0Erros的，
但是具体实施起来超声波就没办法工作，求大佬帮忙看一下，真的谢谢你们了，顺便我附上了我自己的工程文件，如果看上边不方便，可以下载看看，能这样真的是帮大忙了