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typedef struct
{
uint32_t Request; /*!< Specifies the request selected for the specified channel.
This parameter can be a value of @ref DMA_request */
uint32_t Direction; /*!< Specifies if the data will be transferred from memory to peripheral,
from memory to memory or from peripheral to memory.
This parameter can be a value of @ref DMA_Data_transfer_direction */
uint32_t PeriphInc; /*!< Specifies whether the Peripheral address register should be incremented or not.
This parameter can be a value of @ref DMA_Peripheral_incremented_mode */
uint32_t MemInc; /*!< Specifies whether the memory address register should be incremented or not.
This parameter can be a value of @ref DMA_Memory_incremented_mode */
uint32_t PeriphDataAlignment; /*!< Specifies the Peripheral data width.
This parameter can be a value of @ref DMA_Peripheral_data_size */
uint32_t MemDataAlignment; /*!< Specifies the Memory data width.
This parameter can be a value of @ref DMA_Memory_data_size */
uint32_t Mode; /*!< Specifies the operation mode of the DMAy Channelx.
This parameter can be a value of @ref DMA_mode
@note The circular buffer mode cannot be used if the memory-to-memory
data transfer is configured on the selected Channel */
uint32_t Priority; /*!< Specifies the software priority for the DMAy Channelx.
This parameter can be a value of @ref DMA_Priority_level */
} DMA_InitTypeDef;
typedef struct
{
__IO uint32_t CCR; /*!< DMA channel x configuration register */
__IO uint32_t CNDTR; /*!< DMA channel x number of data register */
__IO uint32_t CPAR; /*!< DMA channel x peripheral address register */
__IO uint32_t CMAR; /*!< DMA channel x memory address register */
} DMA_Channel_TypeDef;
DMAy_Channelx->CNDTR = DMA_InitStruct->DMA_BufferSize;
而CNDTR即数据传输数量 (Number of data to transfer)
数据传输数量为0至65535。这个寄存器只能在通道不工作(DMA_CCRx的EN=0)时写入。通
道开启后该寄存器变为只读,指示剩余的待传输字节数目。寄存器内容在每次DMA传输后递
减。
数据传输结束后,寄存器的内容或者变为0;或者当该通道配置为自动重加载模式时,寄存
器的内容将被自动重新加载为之前配置时的数值。
当寄存器的内容为0时,无论通道是否开启,都不会发生任何数据传输。
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