【原创】TIM2_CH1高速脉冲DMA捕获（STM32F407ZE）

ID:90014 · 发表于 2015-9-14 15:12

/**
  * @brief  TIM2_DMA_Capture_Config
  * @param  None
  * @retval None
  */
void TIM2_DMA_Capture_Config(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
  DMA_InitTypeDef DMA_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_ICInitTypeDef TIM_ICInitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
#ifdef TIM2_CH1_ETR_PA15
/** TIM2 GPIO Configuration
PA15  ------> TIM2_CH1_ETR
*/
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15; /* PA15: TIM2_CH1 捕获脚 */
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_25MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource15, GPIO_AF_TIM2);
#else
  #ifdef TIM2_CH1_ETR_PA5
/** TIM2 GPIO Configuration
   PA5  ------> TIM2_CH1_ETR
*/
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5; /* PA5: TIM2_CH1 捕获脚 */
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_25MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_TIM2);
  #else
/** TIM2 GPIO Configuration
   PA0  ------> TIM2_CH1_ETR
*/
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0; /* PA0: TIM2_CH1 捕获脚 */
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_25MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource0, GPIO_AF_TIM2);
  #endif
#endif
  DMA_DeInit(DMA1_Stream5);
  /* Enable DMA1 clocks ****************************************/
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
  //TIM2_CH1 CCR1的捕获模式
  /* DMA1_Stream5 channel0 configuration **************************************/
  DMA_InitStructure.DMA_Channel = DMA_Channel_3;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&TIM2->CCR1);
  DMA_InitStructure.DMA_Memory0BaseAddr = (u32)TIM2_CCR1_Buff;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; /* 0：从外设读  */
  DMA_InitStructure.DMA_BufferSize = 20;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA1_Stream5, &DMA_InitStructure);
  DMA_ITConfig(DMA1_Stream5, DMA_IT_TC, ENABLE);
  DMA_Cmd(DMA1_Stream5, ENABLE);

  /* Enable the TIM2 gloabal Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
  NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  TIM_DeInit(TIM2);
  /* TIM2 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 0xFFFFFFFF;  // TIMx_ARR 32位 1000000us
  TIM_TimeBaseStructure.TIM_Prescaler = 0;       // TIMx_PSC 16位 APB1 Timer clk 84MHz
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  /* TIMx configuration: Input Capture mode ---------------------
  The external signal is connected to TIMx CH1 pin
  ------------------------------------------------------------ */
  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 = 0x0;
  TIM_ICInit(TIM2, &TIM_ICInitStructure);
  TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1);
  TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);
  TIM_SelectCCDMA(TIM2,ENABLE);
  TIM_DMAConfig(TIM2, TIM_DMABase_CCR1, TIM_DMABurstLength_16Bytes);
  TIM_DMACmd(TIM2, TIM_DMA_CC1, ENABLE);
  TIM_SetCounter(TIM2, 0);
  /* TIM2 enable counter */
  TIM_Cmd(TIM2, ENABLE);
}

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