?頻率測量：

?頻率>中界頻率：適用測周法? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 頻率<中界頻率：適用測頻法

第一步：配置GPIO，TIM的時(shí)基單元
? ? ? ? ? ? ?在配置TIM的時(shí)基單元參數(shù)有些許不同。

	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_Period = 65536 - 1;		//ARR
	TIM_TimeBaseInitStructure.TIM_Prescaler = 72 - 1;		//PSC
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;


	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);



    TIM_TimeBaseInitStructure.TIM_Period = 65536 - 1;		//ARR
    
    以最大量程計(jì)數(shù)，防止計(jì)數(shù)溢出




    TIM_TimeBaseInitStructure.TIM_Prescaler = 72 - 1;		//PSC 

    這個(gè)決定計(jì)數(shù)頻率：72M/PSC，這里取72-1，則計(jì)數(shù)頻率就1MHZ

    最低頻率：1MHZ／65535 = 15HZ  所以最低頻率由PSC決定

初始化輸入捕獲單元：void TIM_ICInit()；
?

/**
  * @brief  Initializes the TIM peripheral according to the specified
  *         parameters in the TIM_ICInitStruct.
  * @param  TIMx: where x can be  1 to 17 except 6 and 7 to select the TIM peripheral.
  * @param  TIM_ICInitStruct: pointer to a TIM_ICInitTypeDef structure
  *         that contains the configuration information for the specified TIM peripheral.
  * @retval None
  */
void TIM_ICInit(TIM_TypeDef* TIMx, TIM_ICInitTypeDef* TIM_ICInitStruct)
{
  ......
}


   參數(shù)講解

	TIM_ICInitStructure.TIM_Channel =          選擇通道

	TIM_ICInitStructure.TIM_ICFilter =         選擇濾波器

	TIM_ICInitStructure.TIM_ICPolarity =       選擇觸發(fā)極性

	TIM_ICInitStructure.TIM_ICPrescaler =      選擇分頻系數(shù)

	TIM_ICInitStructure.TIM_ICSelection =      選擇觸發(fā)信號的輸入端      

配置觸發(fā)源：void TIM_SelectInputTrigger()
?

/**
  * @brief  Selects the Input Trigger source
  * @param  TIMx: where x can be  1, 2, 3, 4, 5, 8, 9, 12 or 15 to select the TIM peripheral.
  * @param  TIM_InputTriggerSource: The Input Trigger source.
  *   This parameter can be one of the following values:
  *     @arg TIM_TS_ITR0: Internal Trigger 0
  *     @arg TIM_TS_ITR1: Internal Trigger 1
  *     @arg TIM_TS_ITR2: Internal Trigger 2
  *     @arg TIM_TS_ITR3: Internal Trigger 3
  *     @arg TIM_TS_TI1F_ED: TI1 Edge Detector
  *     @arg TIM_TS_TI1FP1: Filtered Timer Input 1
  *     @arg TIM_TS_TI2FP2: Filtered Timer Input 2
  *     @arg TIM_TS_ETRF: External Trigger input
  * @retval None
  */
void TIM_SelectInputTrigger(TIM_TypeDef* TIMx, uint16_t TIM_InputTriggerSource)
{
  ...........
}

選擇從模式：void TIM_SelectSlaveMode()
?

/**
  * @brief  Selects the TIMx Slave Mode.
  * @param  TIMx: where x can be 1, 2, 3, 4, 5, 8, 9, 12 or 15 to select the TIM peripheral.
  * @param  TIM_SlaveMode: specifies the Timer Slave Mode.
  *   This parameter can be one of the following values:
  *     @arg TIM_SlaveMode_Reset: Rising edge of the selected trigger signal (TRGI) re-initializes
  *                               the counter and triggers an update of the registers.
  *     @arg TIM_SlaveMode_Gated:     The counter clock is enabled when the trigger signal (TRGI) is high.
  *     @arg TIM_SlaveMode_Trigger:   The counter starts at a rising edge of the trigger TRGI.
  *     @arg TIM_SlaveMode_External1: Rising edges of the selected trigger (TRGI) clock the counter.
  * @retval None
  */
void TIM_SelectSlaveMode(TIM_TypeDef* TIMx, uint16_t TIM_SlaveMode)
{
  .............
}

使能定時(shí)器：void TIM_Cmd()；
?

/**
  * @brief  Enables or disables the specified TIM peripheral.
  * @param  TIMx: where x can be 1 to 17 to select the TIMx peripheral.
  * @param  NewState: new state of the TIMx peripheral.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void TIM_Cmd(TIM_TypeDef* TIMx, FunctionalState NewState)
{
  ............
}

那么，怎么獲取周期呢：根據(jù)測周法：fx = fc / N??
?

根據(jù)測周法：fx = fc / N

fc  為標(biāo)準(zhǔn)頻率  根據(jù)PSC的配置 fc = 1MHZ


 則 N 等于輸入捕獲的值： TIM_GetCapture1()、 TIM_GetCapture2()、 TIM_GetCapture3()、 
                        TIM_GetCapture4()、

/**
  * @brief  Gets the TIMx Input Capture 2 value.
  * @param  TIMx: where x can be 1, 2, 3, 4, 5, 8, 9, 12 or 15 to select the TIM peripheral.
  * @retval Capture Compare 1 Register value.
  */
uint16_t TIM_GetCapture1(TIM_TypeDef* TIMx)
{
  ..............
}


如何測占空比？只需要將CH2通道配置成相反的的數(shù)

然后 Duty = CCR(CH2)/CCR(CH1)  or  CCR(CH1)/CCR(CH2) 

其他函數(shù)：void TIM_PWMIConfig()；文章來源地址http://www.zghlxwxcb.cn/news/detail-645275.html

/**
  * @brief  Configures the TIM peripheral according to the specified
  *         parameters in the TIM_ICInitStruct to measure an external PWM signal.
  * @param  TIMx: where x can be  1, 2, 3, 4, 5, 8, 9, 12 or 15 to select the TIM peripheral.
  * @param  TIM_ICInitStruct: pointer to a TIM_ICInitTypeDef structure
  *         that contains the configuration information for the specified TIM peripheral.
  * @retval None
  */
void TIM_PWMIConfig(TIM_TypeDef* TIMx, TIM_ICInitTypeDef* TIM_ICInitStruct)
{
.........................
}



將通道CH1和CH2配置成相反的參數(shù)，不支持CH3，和CH4

快速配置成PWMI的標(biāo)準(zhǔn)模型

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