STM32定时器时间获取的问题

爱学习的人 · 发表于 2018-6-27 17:28:45

我想做一个声音定位，四个声音接收模块分别连接PB6、PB7、PB8、PB9，想用定时器测量每两个声音接收模块收到时间的时间差，但是定时器获取的时间却不对，下面是代码：
void TIM3_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_Initsture;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); //使能引脚时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //定时器3使能
GPIO_Initsture.GPIO_Pin = GPIO_Pin_6;
GPIO_Initsture.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOB,&GPIO_Initsture);
GPIO_SetBits(GPIOB,GPIO_Pin_6);

GPIO_Initsture.GPIO_Pin = GPIO_Pin_7;
GPIO_Initsture.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB,&GPIO_Initsture);
GPIO_SetBits(GPIOB,GPIO_Pin_7);

GPIO_Initsture.GPIO_Pin = GPIO_Pin_8;
GPIO_Initsture.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB,&GPIO_Initsture);
GPIO_SetBits(GPIOB,GPIO_Pin_8);

GPIO_Initsture.GPIO_Pin = GPIO_Pin_9;
GPIO_Initsture.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB,&GPIO_Initsture);
GPIO_SetBits(GPIOB,GPIO_Pin_9);

TIM_TimeBaseStructure.TIM_Period = arr; //重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //时钟分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

TIM_ClearFlag(TIM3,TIM_FLAG_Update);  //清除更新中断
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //打开定时器更新下中断

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
TIM_Cmd(TIM3, DISABLE);  //使能TIMx外设

}
void TIM3_IRQHandler(void)  //定时器中断
{
if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  //检查TIM2更新中断是否发生
{
  TIM_ClearITPendingBit(TIM3, TIM_IT_Update);  //清除TIM2更新中断
  msTime++;
}
}
int time1,time2,time3;
void Sound_Positioning(void)
{
msTime = 0;
if(IN1 == 0)
{
  TIM_SetCounter(TIM3,0);//将定时器中的数清零
  TIM_Cmd(TIM3,ENABLE);//打开定时器
  if(IN1 == 0&&IN2 == 0)
  {
time1 = TIM3->CNT;//获取第一个时间
time1 = time1 + msTime*1000;
if(IN1 == 0&&IN2 == 0&&IN3 == 0)
{
time2 = TIM3->CNT;//获取第二个时间
time2 = time2 + msTime*1000;
if(IN1 == 0&&IN2 == 0&&IN3 == 0&&IN4 == 0)  //1 2 3 4
{
   time3 = TIM3->CNT;//获取第三个时间
   time3 = time3 + msTime*1000;
   TIM_Cmd(TIM3,DISABLE);//关闭定时器
}
}
else if(IN1 == 0&&IN2 == 0&&IN4 == 0)
{
time2 = TIM_GetCounter(TIM3);//获取第二个时间
   time3 = time3 + msTime*1000;
if(IN1 == 0&&IN2 == 0&&IN3 == 0&&IN4 == 0)  //1 2 4 3
{
   time3 = TIM_GetCounter(TIM3);//获取第三个时间
   time3 = time3 + msTime*1000;
   TIM_Cmd(TIM3,DISABLE);//关闭定时器
   TIM_SetCounter(TIM3,0);//将定时器中的数清零
}
}
  }
  else if(IN1 == 0&&IN3 == 0)
  {
time1 = TIM_GetCounter(TIM3);//获取第一个时间
   time3 = time3 + msTime*1000;
if(IN1 == 0&&IN3 == 0&&IN2 == 0)
{
time2 = TIM_GetCounter(TIM3);//获取第二个时间
   time3 = time3 + msTime*1000;
if(IN1 == 0&&IN2 == 0&&IN3 == 0&&IN4 == 0) //1 3 2 4
{
   time3 = TIM_GetCounter(TIM3);//获取第三个时间
   time3 = time3 + msTime*1000;
   TIM_Cmd(TIM3,DISABLE);//关闭定时器
   TIM_SetCounter(TIM3,0);//将定时器中的数清零
}
}
else if(IN1 == 0&&IN3 == 0&&IN4 == 0)
{
time2 = TIM_GetCounter(TIM3);//获取第二个时间
   time3 = time3 + msTime*1000;
if(IN1 == 0&&IN2 == 0&&IN3 == 0&&IN4 == 0) //1 3 4 2
{
   time3 = TIM_GetCounter(TIM3);//获取第三个时间
   time3 = time3 + msTime*1000;
   TIM_Cmd(TIM3,DISABLE);//关闭定时器
   TIM_SetCounter(TIM3,0);//将定时器中的数清零
}
}
  }
  else if(IN1 == 0&&IN4 == 0)
  {
time1 = TIM_GetCounter(TIM3);//获取第一个时间
   time3 = time3 + msTime*1000;
if(IN1 == 0&&IN4 == 0&&IN2 == 0)
{
time2 = TIM_GetCounter(TIM3);//获取第二个时间
   time3 = time3 + msTime*1000;
if(IN1 == 0&&IN2 == 0&&IN3 == 0&&IN4 == 0) //1 4 2 3
{
   time3 = TIM_GetCounter(TIM3);//获取第三个时间
   time3 = time3 + msTime*1000;
   TIM_Cmd(TIM3,DISABLE);//关闭定时器
   TIM_SetCounter(TIM3,0);//将定时器中的数清零
}
}
else if(IN1 == 0&&IN4 == 0&&IN3 == 0)
{
time2 = TIM_GetCounter(TIM3);//获取第二个时间
   time3 = time3 + msTime*1000;
if(IN1 == 0&&IN2 == 0&&IN3 == 0&&IN4 == 0) //1 4 3 2
{
   time3 = TIM_GetCounter(TIM3);//获取第三个时间
   time3 = time3 + msTime*1000;
   TIM_Cmd(TIM3,DISABLE);//关闭定时器
   TIM_SetCounter(TIM3,0);//将定时器中的数清零
}
}
  }
}
GPIO_SetBits(GPIOB,GPIO_Pin_6);
GPIO_SetBits(GPIOB,GPIO_Pin_7);
GPIO_SetBits(GPIOB,GPIO_Pin_8);
GPIO_SetBits(GPIOB,GPIO_Pin_9);
printf("%d  %d  %d \r\n",time1,time2,time3);

}

怎么也得不出正确时间，焦头烂额两天了，请各位指教一下。非常感谢！