[mw_shl_code=c,true]//定时器2通道2输入捕获配置 //arr：自动重装值(TIM2,TIM5是32位的!!) //psc：时钟预分频数 TIM_ICInitTypeDef TIM2_ICInitStructure; void TIM2_CH2_Cap_Init(u32 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); //TIM2时钟使能 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOB, ENABLE); //使能PORTA时钟 TIM_DeInit(TIM2); //数据总线使能 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All; //GPIOB GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//输入 GPIO_Init(GPIOB,&GPIO_InitStructure); //初始化PA1 //产生捕获源 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //GPIOA3 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//复用功能 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //下拉 GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA0 //时钟脚 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //GPIOA1 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; //下拉 GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA1 GPIO_PinAFConfig(GPIOA,GPIO_PinSource1,GPIO_AF_TIM2); //PA1复用位定时器2 TIM_TimeBaseStructure.TIM_Prescaler=psc; //定时器分频 TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式 TIM_TimeBaseStructure.TIM_Period=arr; //自动重装载值 TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure); //初始化TIM2输入捕获参数 TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC2S=01 选择输入端 IC1映射到TI1上 TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;//上升沿捕获 TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上 TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频 TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波 TIM_ICInit(TIM2, &TIM2_ICInitStructure); //产生DMA请求信号 TIM_DMACmd(TIM2, TIM_DMA_CC2, ENABLE); //打开定时器 TIM_Cmd(TIM2, ENABLE); } unsigned short SendBuff[1024]; void MYDMA_Config(void) { DMA_InitTypeDef DMA_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1时钟使能 DMA_DeInit(DMA1_Stream6); while (DMA_GetCmdStatus(DMA1_Stream6) != DISABLE){}//等待DMA可配置 /* 配置 DMA Stream */ DMA_InitStructure.DMA_Channel = DMA_Channel_3; //通道选择 DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&GPIOB->IDR;//DMA外设地址 DMA_InitStructure.DMA_Memory0BaseAddr = (u32)SendBuff;//DMA 存储器0地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//外设模式到存储器 DMA_InitStructure.DMA_BufferSize = 1;//数据传输量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设非增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外设数据长度:16位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//存储器数据长度:16位 DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;// 使用循环模式 DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;//中等优先级 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//存储器突发单次传输 DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//外设突发单次传输 DMA_Init(DMA1_Stream6, &DMA_InitStructure);//初始化DMA Stream DMA_Cmd(DMA1_Stream6,ENABLE); } int main(void) { delay_init(168); //初始化延时函数 uart_init(115200);//初始化串口波特率为115200 TIM2_CH2_Cap_Init(256,0); //以xMhz的频率计数 MYDMA_Config();//DMA1,STEAM6,CH3,外设为TIM2,存储器为 SendBuff,长度为:1 while(1) { //捕获源 delay_us(100); GPIO_ResetBits(GPIOA, GPIO_Pin_3); delay_us(100); GPIO_SetBits(GPIOA, GPIO_Pin_3); } } [/mw_shl_code] 请问大家这段代码哪还有问题，我用KEIL调试，watch窗口监视SendBuff，没数据搬用进来