DMA_InitTypeDef DMA_InitStructure; DMA_InitStructure.DMA_PeripheralBaseAddr = par;//DMA外设地址DMA_InitStructure.DMA_MemoryBaseAddr = mar;//DMA 存储器0地址DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//存储器到外设模式 DMA_InitStructure.DMA_BufferSize = ndtr;//数据传输量DMA_InitStructure.DMA_...
ENABLE);/*DMA配置*/DMA_InitStructure.DMA_PeripheralBaseAddr=USART1_DR_Base;//串口数据寄存器地址DMA_InitStructure.DMA_MemoryBaseAddr=(uint32_t)SendBuff;//内存地址(要传输的变量的指针)DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralDST;//方向(从内存到外设)DMA_InitStructure.DMA_BufferSize=500;//传输...
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SendBuff; //内存地址(要传输的变量的指针) DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //方向(从内存到外设) DMA_InitStructure.DMA_BufferSize = 500; //传输内容的大小 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设...
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)mem_addr; /* 发送数据buf */ DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; /* 传输方向:内存->外设 */ DMA_InitStructure.DMA_BufferSize = mem_size; /* 发送数据buf大小 */ DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; ...
DMA的作用就是实现数据的直接传输,而去掉了传统数据传输需要CPU寄存器参与的环节,主要涉及四种情况的数据传输,但本质上是一样的,都是从内存的某一区域传输到内存的另一区域(外设的数据寄存器本质上就是内存的一个存储单元)。四种情况的数据传输如下: 外设到内存 ...
DMA_DIR_PeripheralDST (( uint32_t ) 0x00000010 ) 2 #define DMA_DIR_PeripheralSRC (( uint32_t ) 0x00000000 ) DMA通道x配置寄存器(DMA_CCRx): 外设地址增量模式: 1 #define DMA_PeripheralInc_Enable (( uint32_t ) 0x00000040 ) 2
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //数据传输方向,从内存读取发送到外设 DMA_InitStructure.DMA_BufferSize = cndtr; //DMA通道的DMA缓存的大小 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变 ...
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = USART3_DMA_send_buffersize; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_...
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//外设为写入目标 DMA_InitStructure.DMA_BufferSize = BufferSize / 4; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址不自增 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; ...
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; /*传输大小DMA_BufferSize=SENDBUFF_SIZE*/ DMA_InitStructure.DMA_BufferSize = SENDBUFF_SIZE; /*外设地址不增*/ DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; /*内存地址自增*/ ...