stm32超声波模块测距程序

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楼主 | 2018-6-29 15:12 | 只看该作者回帖奖励

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STM32, 测距程序, 超声波模块, pi, IO

#include &quot;stm32f10x_tim.h&quot;
#include &quot;sys.h&quot;
#include &quot;delay.h&quot;
#include &quot;usart.h&quot;

void LED_Init(void)
{

GPIO_InitTypeDef  GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;       //*管配置管家
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_All);


RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;             // * trlg控制管家配置
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_7);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;          / / * echo接收管脚配置
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void Tim2_Init(void)
{
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef       TIM_OCInitStructure;
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);       //  时钟配置求大神看一下这里是否有错误！！
      TIM_DeInit(TIM2);
      TIM_TimeBaseStructure.TIM_Period = 20000;
      TIM_TimeBaseStructure.TIM_Prescaler =36000;
      TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
      TIM_Cmd(TIM2,ENABLE);
      TIM_ClearFlag(TIM2,TIM_FLAG_Update);
      TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
}
int main(void)
  {
      const u16 a[10] ={0xd00,0xfddf,0xb04,0x944,0x9c2,0x960,0x920,0xdc4,0x900,0x940 };
      u8 t=0;
      u16 time,juli,i;
      delay_init();
      NVIC_Configuration();
      uart_init(9600);
      LED_Init();
      Tim2_Init();
      while(1)
            {
               GPIO_SetBits(GPIOB,GPIO_Pin_7);
               TIM2->CNT=0;
               TIM_Cmd(TIM2,ENABLE);
               delay_us(1000);
               GPIO_ResetBits(GPIOB,GPIO_Pin_7);
                     while(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_6)==1)
                     {
                              TIM_Cmd(TIM2,DISABLE);
                              time=TIM2->CNT;    //* 这个time为什么一直是0？

                     }
            juli=340*(time/2);
            i=juli%10;
            GPIO_Write(GPIOA,a);
      delay_ms(1000);
}

}

经ST-LINK调试那个time一直为零这是为什么程序那里有错误，

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stm32超声波模块测距程序

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