STM32超声测距

ID:702176 · 发表于 2020-3-4 10:55

附加代码：
#include "stm32f10x.h"
#include "stm32f10x_tim.h"
#include "misc.h"
#include "eight_segment_display.h"

unsigned char tab[3]={0,0,0};
unsigned char tab1[8]={6,4,1,7,3,6,0,8};
unsigned char tab2[8]={6,4,1,7,3,6,0,4};
u16 overcount=0;
unsigned char flag;
//设置中断优先级
void NVIC_Config(void)
{
      NVIC_InitTypeDef NVIC_InitStructer;

      //NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

      NVIC_InitStructer.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructer.NVIC_IRQChannelSubPriority       = 0;
      NVIC_InitStructer.NVIC_IRQChannel                =TIM1_UP_IRQn;
      NVIC_InitStructer.NVIC_IRQChannelCmd             = ENABLE;

      NVIC_Init(&NVIC_InitStructer);
}
void  StartModule(void)
  {
      int delay=0xFf;
   GPIO_ResetBits(GPIOA,GPIO_Pin_0);                      //开启发送脚
      while(delay--);

      GPIO_SetBits(GPIOA,GPIO_Pin_0);
  }

      unsigned int Conut(void)
{
         float length=0;
         u16 tim;
         tim = TIM_GetCounter(TIM1);
         length=(tim+overcount*1000)/58.0;
         TIM1->CNT=0;
         overcount = 0;             //中断溢出次数清零
         return (unsigned int)length;
}
/*
@brief 初始化八段数码管，并在8个数码管上显示数值0~7
@param None
@retval 返回0表示正常结束
*/
int main(void){
unsigned char i;
int tmp;
int       delay1=0xfFf;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructer;
NVIC_Config();
seg_display_init(); //初始化数码管
i=0;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
//定时器TIM2初始化
TIM_DeInit(TIM1);
TIM_TimeBaseInitStructer.TIM_Period       = 10000-1;                                              //定时周期为1000
TIM_TimeBaseInitStructer.TIM_Prescaler    = 8-1;                                                       //分频系数8
TIM_TimeBaseInitStructer.TIM_ClockDivision = TIM_CKD_DIV1;                      //不分频
TIM_TimeBaseInitStructer.TIM_CounterMode = TIM_CounterMode_Up;//向上计数
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructer);

//开启更新中断
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);
//中断参数设置
NVIC_Config();
//关闭定时器使能
TIM_Cmd(TIM1,DISABLE);

int delay=0xFFf;
while(delay--);
while(1){
      StartModule();
      while(!GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_9));
      TIM_Cmd(TIM1,ENABLE);
      while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_9));
      TIM_Cmd(TIM1,DISABLE);
      tmp=Conut();
      tab[0]=tmp/100;
      tab[1]=(tmp%100)/10;
      tab[2]=tmp%10;

      if(!GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_12))
      {
            i=0;
            delay=0x4f;
            while(delay--)
            {
                  set_com_digit(i,tab[i++]);
                  if(i==3){
                  i=0;
                  }
                     delay1=0x4Ff;
                  while(delay1--);
                     close_coms(); //关闭所有的com口
            };
         }
         else
         {
            i=0;
            delay=0x4f;
            while(delay--)
            {
                  set_com_digit(i,tab2[i++]);
                  if(i==8){
                  i=0;
                  }
                  delay1=0x4Ff;
                  while(delay1--);
                     close_coms(); //关闭所有的com口
            };
         }
}

//return 0;
}

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