STM32F2定时器1通道1输入捕获
- Q1 @1 j/ a) @5 i一、中文手册上的配置步骤
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1.1初始化通道对应的IO口
4 {: I) @2 D% K0 qGPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//选择通道对应的IO口

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1.2选择输入捕获的通道
InitStructure.TIM_Channel = TIM_Channel_1;
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选择有效输入端：TIMx_CCR1必须连接到TI1输入，所以写入TIMx_CCR1寄存器中的
) r  z0 \! A% v" dCC1S=01，只要CC1S不为’00’，通道被配置为输入，并且TIMx_CCR1寄存器变为只读
* i! F9 }/ o( @4 C注意 CC1S仅在通道关闭时(TIMx_CCER寄存器的CC1E=0)才是可写的，配置之前调用
1 a9 m0 v3 m5 D/ p4 N+ ]void TIM_DeInit(TIM_TypeDef* TIMx)即可

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' ]. A! {1 G0 V! T1.3配置滤波器为所需带宽–TIM_ICInitStructure.TIM_ICFilter = 0x00;
  u9 A  i. M2 Q8 M  o; l根据输入信号的特点，配置输入滤波器为所需的带宽(即输入为TIx时，输入滤波器控制位是
TIMx_CCMRx寄存器中的ICxF位)。假设输入信号在最多5个内部时钟周期的时间内抖动，
5 M9 w; j$ V& t% e" Z% l8 I我们须配置滤波器的带宽长于5个时钟周期；因此我们可以(以f DTS 频率)连续采样8次，以确
认在TI1上一次真实的边沿变换，即在TIMx_CCMR1寄存器中写入IC1F=0011。
1.4选择有效转换边沿–TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
选择TI1通道的有效转换边沿，在TIMx_CCER寄存器中写入CC1P=0(上升沿)。

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* x3 b9 _9 ^6 m; l- K/ D2 o3 ]1.5配置输入预分频器–TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  F) k9 _, m& C" f& Y在本例中，我们希望捕获发生在每一个有效的电平转换时刻，因此预
分频器被禁止(写TIMx_CCMR1寄存器的IC1PS=00)。
1.6 TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
- B1 x9 a) R0 _( P; CTIM_ICSelection_DirectTI -->TI1,TI2,TI3,TI4 对应IC1,IC2,IC3,IC4;
: F6 m8 W( E7 B. m8 DTIM_ICSelection_IndirectTI–>TI1,TI2,TI3,TI4 对应IC2,IC1,IC4,IC3;
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1 X' c9 N: i, J  Q$ D& C, l5 ^4 w2.1完整代码
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1. RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
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2. RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
   
3. GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_10;//根据通道所对应的IO口修改
   
4. GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
   
5. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
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6. GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
   
7. GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP ;
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8. GPIO_Init(GPIOA, &GPIO_InitStructure);  
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9. GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_TIM1);
   
10. 
    
11. TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;
    
12. TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;//TIM_Input_Capture_Polarity
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13. TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;//TIM_Input_Capture_Selection
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14. TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
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15. TIM_ICInitStructure.TIM_ICFilter = 0x00;
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16. TIM_ICInit(TIM1, &TIM_ICInitStructure);
    
17. 
    
18. NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
    
19. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    
20. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    
21. NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    
22. NVIC_Init(&NVIC_InitStructure);

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3.1输入捕获启动DMA传输配置

1.         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 , ENABLE);
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2.         DMA_DeInit(DMA2_Stream6);
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3.         DMA_InitStructure.DMA_Channel = DMA_Channel_6;  
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4.         DMA_InitStructure.DMA_PeripheralBaseAddr =(uint32_t) GPIOD->IDR;
   
5.         DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)DEF_Buffer;
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6.         DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
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7.         DMA_InitStructure.DMA_BufferSize = 40000;
   
8.         DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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9.         DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
   
10.         DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    
11.         DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
    
12.         DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
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13.         DMA_InitStructure.DMA_Priority = DMA_Priority_High;
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14.         DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
    
15.         DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
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16.         DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    
17.         DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    
18.         DMA_Init(DMA2_Stream6, &DMA_InitStructure);

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- d! u3 A9 c' O9 \9 r) M; e3 ]3.2启动传输

1.         TIM_DMAConfig(TIM1, TIM_DMABase_CCR1, TIM_DMABurstLength_1Transfer);
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2.         TIM_DMACmd(TIM1, TIM_DMA_CC1, ENABLE);
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3.         
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4.         /* Enable the CC2 Interrupt Request */
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5.         TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);
   
6.         /* TIM enable counter */
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7.         TIM_Cmd(TIM1, ENABLE);
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8.         DMA_Cmd(DMA2_Stream6, ENABLE);
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