- UID
- 1029342
- 性别
- 男
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至此,整个DMA总算设置好了,但是,DMA通道又是怎样与外设联系在一起的呢?哈哈,这也是我当初最想知道的一个事情,别急!容我想喝口茶~~~~~~哈哈哈!
要使DMA与外设建立有效连接,这不是DMA自身的事情,是各个外设的事情,每个外设都有 一个xxx_DMACmd(XXXx,Enable )函数,如果使DMA与ADC建立有效联系,就使用ADC_DMACmd(ADC1,Enable); (这里我启用了ADC中的ADC1模块)。
一个简单的例子 transfer a word data buffer from FLASH memory to embedded SRAM memory.
在V3.1.2库的位置
STM32F10x_StdPeriph_Lib_V3.1.2\Project\STM32F10x_StdPeriph_Examples\DMA\FLASH_RAM
/* DMA1 channel6 configuration */
DMA_DeInit(DMA1_Channel6);
//peripheral base address
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SRC_Const_Buffer;
//memory base address
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)DST_Buffer;
//数据传输方向 Peripheral is source
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
//缓冲区大小 Number of data to be transferred (0 up to 65535).数据传输数目
DMA_InitStructure.DMA_BufferSize = BufferSize;
// the Peripheral address register is incremented
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;
//the memory address register is incremented
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
//the Peripheral data width
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_High;
//the DMAy Channelx will be used in memory-to-memory transfer
//DMA通道的操作可以在没有外设请求的情况下进行,这种操作就是存储器到存储器模式。
DMA_InitStructure.DMA_M2M = DMA_M2M_Enable;
DMA_Init(DMA1_Channel6, &DMA_InitStructure);
/* Enable DMA1 Channel6 Transfer Complete interrupt */
DMA_ITConfig(DMA1_Channel6, DMA_IT_TC, ENABLE);
/* Enable DMA1 Channel6 transfer */
DMA_Cmd(DMA1_Channel6, ENABLE);
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