STM32F103RC怎么样同时捕获16路脉冲输入?

发表于 2009-7-21 15:43

STM32F103RC怎么样同时捕获16路脉冲输入? TI3FP3 /TI4FP4 怎么样定义?要算出每个脉冲的宽度

发表于 2009-7-21 15:52

用TIM1,TIM2,TIM3,TIM4 的TIM_Channel_1、TIM_Channel_2 共8路我会，但TIM_Channel_3、TIM_Channel_4的　TIM_SelectInputTrigger 的触发方式不知道用哪个呀?
TIM_SelectInputTrigger(TIM1, TIM_TS_TI1FP1);
TIM_SelectInputTrigger(TIM1, TIM_TS_TI2FP2);
TIM_SelectInputTrigger(TIM1, TIM_TS_TI3FP3);
TIM_SelectInputTrigger(TIM1, TIM_TS_TI4FP4);

发表于 2009-7-21 16:01

//Init Timer1 CC3
TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;

TIM_ICInit(TIM1, &TIM_ICInitStructure);

//Init Timer1 CC4

TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;

TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;

TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;

TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;

TIM_ICInitStructure.TIM_ICFilter = 0x0;

TIM_ICInit(TIM1, &TIM_ICInitStructure);

TIM_SelectInputTrigger(TIM1, TIM_TS_TI3FP3);
是这样吗?

发表于 2009-7-21 16:09

以前有帖子讨论过这个问题。

发表于 2009-7-21 16:13

那我现在要同时捕获16路脉冲(高低电平方波)输入要怎么样处理?

发表于 2009-7-21 16:22

频率低可以用捕获+中断方式，频率高就没有办法了。

发表于 2009-7-21 16:23

能不能同时捕获16路脉冲(高低电平方波)？

发表于 2009-7-21 16:25

频率很能低，不超过50Hz

发表于 2009-7-21 16:36

用16路外部中断来实现吗？我怕外部中断精度不够呀

发表于 2009-7-21 16:40

频率低可以用捕获+中断方式要用哪些中断?

发表于 2009-7-21 16:54

配置定时器为自由计数，即从0x0000计数到0xFFFF，然后重复从0x0000开始。

对于每个通道都是先输入捕获上升沿，发生捕获时产生中断，中断中读出捕获数值，记作IC0，再把捕获边沿改为下降沿，再次发生捕获中断时再读出捕获数值，记作IC1，最后IC0与IC1之差就是脉冲的宽度；在处理下降沿再把捕获边沿改为上升沿，即可进入下一次捕获计算。

2次IC0之差就是外部信号的频率。

发表于 2009-7-21 16:55

每个定时器最多有4个输入捕获通道。

发表于 2009-7-21 17:20

是否每个定时器要启用４个中断?
如:
TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);
TIM_ITConfig(TIM1, TIM_IT_CC2, ENABLE);
TIM_ITConfig(TIM1, TIM_IT_CC3, ENABLE);
TIM_ITConfig(TIM1, TIM_IT_CC4, ENABLE);

发表于 2009-7-21 17:21

发表于 2009-7-21 17:29

TIM_SelectInputTrigger(TIM1, TIM_TS_TI1FP1); 对于此函数的第二个参数用什么呢? TIM_TS_TI1FP1 还是TIM_TS_TI2FP2

发表于 2009-7-21 17:41

不清楚再来问。

其实，你要求的功能用不到这个函数。

发表于 2009-7-21 17:51

发表于 2009-7-21 18:02

谢了.香主

发表于 2009-7-22 13:59

/*******************************************************************************
* Function Name  : NVIC_Config
*
* Description    : None
*
* Arguments      : None
*
* Returns        : None
*******************************************************************************/
static void NVIC_Config(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    /* Set the Vector Table base location at 0x08000000 */
    NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x00);

    /* Configure one bit for preemption priority */
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);

    /* TIM1 IRQ configuration Priority : 1 -----------------------------------*/
    NVIC_InitStructure.NVIC_IRQChannel = TIM1_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /* TIM2 IRQ configuration Priority : 1 -----------------------------------*/
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /* TIM3 IRQ configuration Priority : 1 -----------------------------------*/
    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /* TIM4 IRQ configuration Priority : 1 -----------------------------------*/
    NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);


}

/*******************************************************************************
* Function Name  : TIM_16CaptureInitial
*
* Description    : None
*
* Arguments      : None
*
* Returns        : None
*******************************************************************************/
static void TIM_16CaptureInitial(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_ICInitTypeDef  TIM_ICInitStructure;

  /* Timer Base configuration */
  TIM_TimeBaseStructure.TIM_Period = 65535;
  TIM_TimeBaseStructure.TIM_Prescaler = 7199;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x00;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  // TIMx Input Capture Configuration
  //TIM_ICInitStructure.TIM_ICMode = TIM_ICMode_ICAP;
  TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStructure.TIM_ICFilter = 0;

  TIM_ICInit(TIM1, &TIM_ICInitStructure);
  TIM_ICInit(TIM2, &TIM_ICInitStructure);
  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  TIM_ICInit(TIM4, &TIM_ICInitStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
  TIM_ICInit(TIM1, &TIM_ICInitStructure);
  TIM_ICInit(TIM2, &TIM_ICInitStructure);
  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  TIM_ICInit(TIM4, &TIM_ICInitStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;
  TIM_ICInit(TIM1, &TIM_ICInitStructure);
  TIM_ICInit(TIM2, &TIM_ICInitStructure);
  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  TIM_ICInit(TIM4, &TIM_ICInitStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;
  TIM_ICInit(TIM1, &TIM_ICInitStructure);
  TIM_ICInit(TIM2, &TIM_ICInitStructure);
  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  TIM_ICInit(TIM4, &TIM_ICInitStructure);

  //Enable TIMx Capture Compare x Interrupt source
  TIM_ITConfig(TIM1,TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4,ENABLE);
  TIM_ITConfig(TIM2,TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4,ENABLE);
  TIM_ITConfig(TIM3,TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4,ENABLE);
  TIM_ITConfig(TIM4,TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4,ENABLE);


  /* Enable timer counter */
  TIM_Cmd(TIM1,ENABLE);
  TIM_Cmd(TIM2,ENABLE);
  TIM_Cmd(TIM3,ENABLE);
  TIM_Cmd(TIM4,ENABLE);

}

发表于 2009-7-22 14:05

脉冲长度 1ms -- 6000ms
CPU(72MHz)

STM32F103RC怎么样同时捕获16路脉冲输入?

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TIM1,TIM2,TIM3,TIM4

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STM32F103RC怎么样同时捕获16路脉冲输入

高低电平方波的频率是多少？

能不能同时捕获16路脉冲(高低电平方波)？

频率很能低，不超过50Hz

用16路外部中断来实现吗？

用哪些中断

如果频率只有50Hz，可以使用捕获+中断方式

按照11楼的办法，使用4个定时器可以实现同时捕获16路脉冲输

是否每个定时器要启用４个中断?

YES

TIM_SelectInputTrigger

你能先看看手册吗？

这才是你要的

谢了

同时捕获16路脉冲输入

香主,脉冲长度太大,以上的程序可以吗

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