/**
* @brief TIM5_DMA_Capture_Config
* @param None
* @retval None
*/
void TIM5_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);
/** TIM5 GPIO Configuration
PA1 ------> TIM5_CH2
*/
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1; /* PA1: TIM5_CH2 捕獲腳 */
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_PinSource1, GPIO_AF_TIM5);
DMA_DeInit(DMA1_Stream4);
/* Enable DMA1 clocks ****************************************/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
//TIM5_CH2 的捕獲模式CCR2
/* DMA1_Stream4 channel6 configuration **************************************/
DMA_InitStructure.DMA_Channel = DMA_Channel_6;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&TIM5->CCR2);
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)TIM5_CCR2_Buff;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; /* 0：從外設讀 */
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_Stream4, &DMA_InitStructure);
DMA_ITConfig(DMA1_Stream4, DMA_IT_TC, ENABLE);
DMA_Cmd(DMA1_Stream4, ENABLE);
/* Enable the TIM5 gloabal Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM5_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_Stream4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_DeInit(TIM5);
/* TIM5 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, 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(TIM5, &TIM_TimeBaseStructure);
/* TIMx configuration: Input Capture mode ---------------------
The external signal is connected to TIMx CH1 pin
------------------------------------------------------------ */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
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(TIM5, &TIM_ICInitStructure);
TIM_SelectInputTrigger(TIM5, TIM_TS_TI2FP2);
TIM_SelectSlaveMode(TIM5, TIM_SlaveMode_Reset);
TIM_SelectCCDMA(TIM5,ENABLE);
TIM_DMAConfig(TIM5, TIM_DMABase_CCR2, TIM_DMABurstLength_16Bytes);
TIM_DMACmd(TIM5, TIM_DMA_CC2, ENABLE);
TIM_SetCounter(TIM5, 0);
/* TIM5 Enable Counter */
TIM_Cmd(TIM5, ENABLE);
}
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