STM32的PWM輸入模式設置并用DMA接收數據

/**********************************************************************             函數**********************************************************************//**********************************************************************             接口函數:初始化紅外學習模塊**********************************************************************/void inf_infrared_study_init( void ){//初始化io口inf_init_io( );//初始化中斷//inf_init_irq();//初始化定時器inf_init_timer( );//打開DMAinf_infrared_study_open_dma( 1 );//打開定時器inf_infrared_study_open_timer( 1 );}/**********************************************************************             初始化io口**********************************************************************/static void inf_init_io( void ){//定義IO初始化結構體GPIO_InitTypeDef GPIO_InitStructure;//初始化時鐘RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );//管腳初始化  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;//設置為輸入           GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//初始化         GPIO_Init( GPIOA, &GPIO_InitStructure );}/**********************************************************************             初始化中斷**********************************************************************/static void inf_init_irq( void ){//定義外部中斷結構體EXTI_InitTypeDef EXTI_InitStructure;//初始化中斷腳復用時鐘RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO, ENABLE );//配置中斷源GPIO_EXTILineConfig( GPIO_PortSourceGPIOB, GPIO_PinSource1 );// 配置下降沿觸發EXTI_ClearITPendingBit( EXTI_Line1 );EXTI_InitStructure.EXTI_Line = EXTI_Line1;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_Init( &EXTI_InitStructure );}/**********************************************************************             初始化定時器**********************************************************************/static void inf_init_timer( void ){//定義定時器結構體TIM_TimeBaseInitTypeDef timInitStruct;//輸入捕獲結構體TIM_ICInitTypeDef tim_icinit;//定義DMA結構體DMA_InitTypeDef DMA_InitStructure;//啟動DMA時鐘RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );//DMA1通道配置DMA_DeInit( DMA1_Channel2 );//外設地址DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) ( &TIM1->CCR1 );//內存地址DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) Rx_Buf_Tim_Dma1;//dma傳輸方向單向DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;//設置DMA在傳輸時緩沖區的長度DMA_InitStructure.DMA_BufferSize = RX_LEN_TIM_DMA;//設置DMA的外設遞增模式，一個外設DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//設置DMA的內存遞增模式DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//外設數據字長DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//內存數據字長DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//設置DMA的傳輸模式//DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//設置DMA的優先級別DMA_InitStructure.DMA_Priority = DMA_Priority_High;//設置DMA的2個memory中的變量互相訪問DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;DMA_Init( DMA1_Channel2, &DMA_InitStructure );//啟動DMA時鐘RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );//DMA1通道配置DMA_DeInit( DMA1_Channel3 );//外設地址DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) ( &TIM1->CCR2 );//內存地址DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) Rx_Buf_Tim_Dma2;//dma傳輸方向單向DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;//設置DMA在傳輸時緩沖區的長度DMA_InitStructure.DMA_BufferSize = RX_LEN_TIM_DMA;//設置DMA的外設遞增模式，一個外設DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//設置DMA的內存遞增模式DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//外設數據字長DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//內存數據字長DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//設置DMA的傳輸模式//DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//設置DMA的優先級別DMA_InitStructure.DMA_Priority = DMA_Priority_High;//設置DMA的2個memory中的變量互相訪問DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;DMA_Init( DMA1_Channel3, &DMA_InitStructure );//開啟時鐘RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1, ENABLE );//重新將Timer設置為缺省值TIM_DeInit( TIM1 );//采用內部時鐘提供時鐘源TIM_InternalClockConfig( TIM1 );//預分頻timInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;//計數頻率為500ns跳轉1次      timInitStruct.TIM_Prescaler = SystemCoreClock / 1 - 1;//向上計數          timInitStruct.TIM_CounterMode = TIM_CounterMode_Up;timInitStruct.TIM_RepetitionCounter = 0;//這個值實際上就是TIMX->ARR，延時開始時重新設定即可 timInitStruct.TIM_Period = 0xffff;//初始化定時器TIM_TimeBaseInit( TIM1, &timInitStruct );//輸入捕獲配置//選擇通道tim_icinit.TIM_Channel = TIM_Channel_1;//硬件濾波tim_icinit.TIM_ICFilter = 0x0;//觸發捕獲的電平tim_icinit.TIM_ICPolarity = TIM_ICPolarity_Falling;//每次檢測到觸發電平都捕獲tim_icinit.TIM_ICPrescaler = TIM_ICPSC_DIV1;//通道方向選擇tim_icinit.TIM_ICSelection = TIM_ICSelection_DirectTI;//初始化//TIM_ICInit(TIM1,&tim_icinit);TIM_PWMIConfig( TIM1, &tim_icinit );//禁止ARR預裝載緩沖器  //TIM_ARRPreloadConfig(TIM1, DISABLE);  //輸入跳變選擇TIM_SelectInputTrigger( TIM1, TIM_TS_TI1FP1 );//從機模式:復位模式TIM_SelectSlaveMode( TIM1, TIM_SlaveMode_Reset );//主從模式選擇TIM_SelectMasterSlaveMode( TIM1, TIM_MasterSlaveMode_Enable );//配置定時器的DMATIM_DMAConfig( TIM1, TIM_DMABase_CCR1, TIM_DMABurstLength_2Bytes );//產生DMA請求信號TIM_DMACmd( TIM1, TIM_DMA_CC1, ENABLE );//配置定時器的DMATIM_DMAConfig( TIM1, TIM_DMABase_CCR2, TIM_DMABurstLength_2Bytes );//產生DMA請求信號TIM_DMACmd( TIM1, TIM_DMA_CC2, ENABLE );//打開定時器TIM_Cmd( TIM1, ENABLE );}/**********************************************************************             接口函數:打開定時器*參數:state:狀態:0:關閉,1:打開**********************************************************************/void inf_infrared_study_open_timer( uint8_t state ){if ( state ){TIM_Cmd( TIM1, ENABLE );}else{TIM_Cmd( TIM1, DISABLE );}}/**********************************************************************             接口函數:打開中斷*參數:state:狀態:0:關閉,1:打開**********************************************************************/void inf_infrared_study_open_irq( uint8_t state ){//定義中斷結構體NVIC_InitTypeDef NVIC_InitStructure;if ( state ){//打開中斷NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;        //通道設置為外部中斷線NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;     //中斷搶占先等級NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;            //中斷響應優先級NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;               //打開中斷NVIC_Init( &NVIC_InitStructure );                                 //初始化}else{//關閉中斷NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;        //通道設置為外部中斷線NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;     //中斷搶占先等級NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;            //中斷響應優先級NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;              //打開中斷NVIC_Init( &NVIC_InitStructure );                                 //初始化}}/**********************************************************************             接口函數:打開DMA*參數:state:狀態:0:關閉,1:打開**********************************************************************/void inf_infrared_study_open_dma( uint8_t state ){if ( state ){//設置傳輸數據長度//DMA_SetCurrDataCounter(DMA1_Channel3,RX_LEN_TIM_DMA);//打開DMADMA_Cmd( DMA1_Channel2, ENABLE );DMA_Cmd( DMA1_Channel3, ENABLE );}else{DMA_Cmd( DMA1_Channel2, DISABLE );DMA_Cmd( DMA1_Channel3, ENABLE );}}/**********************************************************************             接口函數:得到DMA接收幀長*返回:幀長**********************************************************************/uint16_t inf_infrared_study_dma_rx_len( void ){//獲得接收幀幀長return ( RX_LEN_TIM_DMA - DMA_GetCurrDataCounter( DMA1_Channel2 ) );}