stm32 测车轮转速 除了配置定时器对外部脉冲计数 ，还需要配置其他定时器么来采集脉冲么？（请教大家）

fangxiaoyanzhou

硬件连接 ：PE.7复用为TIM1.ETR, PD.13复用为TIM4-CH2（输出PWM），PE.7连接PD.13，对PWM计数。
问题如下：1想配置PE.8输出PWM,但是PWM和TIM1的周期一样，担心溢出所以改用TIM4对PE.7计数。实际可以用PE.8？
2.要完成测车轮转速，是不是还要开定时器，在T时间内对外部脉冲计数，从而得到转速？
3.能不能使用软件来定时采样脉冲，再计数处理？
 下面脉冲计数的代码：

void RCC_Configuration(void);

void GPIO_Configuration(void);

void NVIC_Configuration(void);

void Delay(__IO uint32_t nCount);

void tim1_confi(void);

void tim4_confi(void);  //TIM4初始化

u16 counter=0;

int main(void)

{ 

// u8 i=0; 

  /* System Clocks Configuration */

  RCC_Configuration();

        

  /* Configure the GPIO ports */

  GPIO_Configuration();

  /*Configure tim1 and tim4 */

  tim1_confi();

  tim4_confi();

  while (1)

  {

  counter=TIM_GetCounter(TIM1);  //只能读出最终值，采样的时钟要比输入信号快。

  }

}

void Delay(__IO uint32_t nCount)

{

  for(; nCount != 0; nCount--);

}

void RCC_Configuration(void)

{

  /* Setup the microcontroller system. Initialize the Embedded Flash Interface,  

     initialize the PLL and update the SystemFrequency variable. */

  SystemInit();

   

  /* EnableGPIO Port, GPIO_LED and AFIO clock */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE  | RCC_APB2Periph_AFIO, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);  //使能定时器TIM1时钟

}

void GPIO_Configuration(void)

{

 GPIO_InitTypeDef  GPIO_InitStructure;

 

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE); //使能PE端口时钟

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);  //使能定时器TIM1时钟

 GPIO_PinRemapConfig (GPIO_FullRemap_TIM1 ,ENABLE );  //重映射

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; // 端口配置

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //输入

 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度为50MHz

 GPIO_Init(GPIOE, &GPIO_InitStructure); //根据设定参数初始化GPIOE.7

// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //PE.8 端口配置

// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出

// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度为50MHz

// GPIO_Init(GPIOE, &GPIO_InitStructure); //根据设定参数初始化GPIOE.8

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); //使能PD端口时钟

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);  //使能定时器TIM4时钟

  GPIO_PinRemapConfig (GPIO_Remap_TIM4  ,ENABLE );  //重映射

  GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13 ;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 

  GPIO_Init(GPIOD, &GPIO_InitStructure); 

}

 void tim1_confi(void)  //TIM1初始化

 {

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

    TIM_DeInit( TIM1 ) ;

  /* Time Base configuration */

TIM_TimeBaseStructure.TIM_Period = 0XFFFF; //

TIM_TimeBaseStructure.TIM_Prescaler = 72-1;

  TIM_TimeBaseStructure.TIM_ClockDivision = 0;

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); 

/* TIM1-ETR Configuration */

  TIM_ETRClockMode2Config (TIM1,TIM_ExtTRGPSC_OFF,TIM_ExtTRGPolarity_NonInverted,0);

TIM_SetCounter( TIM1,0) ; //从零计数

TIM_Cmd(TIM1, ENABLE); //使能打开

 }

  void tim4_confi(void)  //TIM4初始化

  {

 // TIM4-CH2基本计数器设置（设置PWM频率）

// 频率=TIM1_CLK/(ARR+1)

     TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;

    TIM_DeInit( TIM4 ) ;

    TIM_BaseInitStructure.TIM_Period = 100;  // 确定T=2.35ms,34%

    TIM_BaseInitStructure.TIM_Prescaler = 72-1;  

    TIM_BaseInitStructure.TIM_ClockDivision = 0;

    TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_BaseInitStructure.TIM_RepetitionCounter = 0;

    TIM_TimeBaseInit(TIM4, &TIM_BaseInitStructure);

 //启用ARR的影子寄存器（直到产生更新事件才更改设置）

TIM_ARRPreloadConfig(TIM3, ENABLE);

//TIM4_OC2模块设置

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

TIM_OCInitStructure.TIM_Pulse = 50;

TIM_OC2Init(TIM4, &TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);

//TIM3开启

TIM_Cmd(TIM4, ENABLE);

//TIM1_OC通道输出PWM（一定要加）

TIM_CtrlPWMOutputs(TIM4, ENABLE);

  

  }

#ifdef  USE_FULL_ASSERT

/**

  * @brief  Reports the name of the source file and the source line number

  *   where the assert_param error has occurred.

  * @param file: pointer to the source file name

  * @param line: assert_param error line source number

  * @retval : None

  */

void assert_failed(uint8_t* file, uint32_t line)

{ 

  /* User can add his own implementation to report the file name and line number,

     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */

  while (1)

  {

  }

}

#endif

正点妹子

     码盘吗？ 那得两路信号，测车轮的速度方向       

fangxiaoyanzhou

回复【2楼】正点妹子:
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左右各一路。上面只列举了一路

fangxiaoyanzhou

回复【2楼】正点妹子:
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用的光电管，应该测不出方向

青玉更落星雨

为什么需要两个定时器