stm32F429DMA地址

### STM32F429 DMA Configuration and Address Handling In the context of configuring Direct Memory Access (DMA) on an STM32F429 microcontroller, several key aspects must be considered to ensure efficient data transfer between peripherals and memory without CPU intervention. The process involves enabling clocks for both DMA and any peripheral involved such as USART[^2], setting up specific parameters like direction, size, priority level, and finally initiating the DMA operation. #### Enabling Clocks To begin with, it is essential that the appropriate clock sources are enabled before performing any operations related to DMA or connected peripherals. This ensures all necessary hardware components receive power and can operate correctly during setup and execution phases. ```c RCC_APB1PeriphClockCmd(RCC_APB1Periph_DMA1 | RCC_APB1Periph_USART2, ENABLE); ``` #### Configuring DMA Channel Parameters Once clocks have been properly configured, attention turns towards specifying details about how data should move through the system: - **Direction**: Determines whether transfers occur from memory-to-peripheral (`DMA_DIR_PeripheralDST`) or vice versa. - **Buffer Size & Data Item Size**: Defines quantity along with individual element dimensions being moved per transaction cycle. - **Priority Level Setting**: Allows prioritization among multiple ongoing tasks within same channel/resource pool; options include low, medium, high, very_high. An example snippet illustrating these settings follows below specifically tailored around UART communication scenarios but applicable more broadly across different types of transactions supported by this architecture family member. ```c DMA_InitTypeDef DMA_InitStructure; // Configure DMA structure initialization parameters DMA_DeInit(DMA1_Channel5); // Reset register values associated with chosen line prior assignment new ones DMA_InitStructure.DMA_BufferSize = Buffer_Size; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&TxBuffer[0]; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA📐⚗️ ⚗️⚗️<tool_call>⚗📐📐📐📐📐📐⚗️📐⚗️📐⚗️📐⚗️