In STM32VLDiscovery their ST32F100RB microcontroller with a single DMA unit having 7 channels. Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system memory (random-access memory) independent of the central processing unit (CPU).. This article describes DMA controller used in the STM32 microcontrollers and its configuration. The first half of the transmit buffer is loaded with new data by the CPU in the Transmit Half Complete interrupt callback while the second half of the buffer is being transmitted by the DMA in the background. Chapter 10 DMA Controller Direct Memory Access (DMA) is one of several methods for coordinating the timing of data transfers between an input/output (I/O) device and the core processing unit or memory in a computer. In this post, I will take STM32 DMA as an example to show the advantages of using DMA over normal transferring method. The function above enables the DMA controller #2 (according to the STM32F410RB documentation, DMA#1 cannot be used for memory-to-memory transfers), and performs a single memory-to-memory transfer operation between s_Buffer1 and s_Buffer2. The STM32 microcontroller family has 2 DMA controllers, and 16 DMA “streams”. Without DMA, when the CPU is using programmed input/output, it is typically fully occupied for the entire duration of the read or write operation, and is thus unavailable to perform other work. Использование DMA c USART. In this example 2000 bytes will be transfered using DMA, Transmit Half Complete and Transmit Complete interrupts achieving the best performance.
Примеры использования DMA в STM32. DMA controller can do automated memory to memory data transfers, also do peripheral to memory and peripheral to peripheral. In this post, I will take STM32 DMA as an example to show the advantages of using DMA over normal transferring method.

DMA (Direct Memory Access) контроллер прямого доступа к памяти. DMA FT3 - memory write triggered at 3/4 (three words). Streams are pathways where memory can flow, and each processor has 8 to work with. Enable peripheral to memory or memory to peripheral dma operations through the DMAMUX on STM32xx. and it serves to descramble the processor of the transfer operations.
STM32 Transfer data buffer from FLASH memory to SRAM ... #define DMA_CHANNEL DMA_CHANNEL_0 #define DMA_INSTANCE_IRQ DMA2_Stream0_IRQn #define DMA_INSTANCE_IRQHANDLER DMA2_Stream0_IRQHandler #define BUFFER_SIZE 32 DMA_HandleTypeDef DmaHandle; ... /* Set to 1 if transfer is correctly completed */ DMA channels can be assigned one of four priority level: very high, high, medium, and low. DMA FT1 uses DMA with internal 4-word FIFO enabled. Set the peripheral register address in the DMA_CPARx register. The DMA controller provides quick read and write data from or into the memory. STM32 DMA Configuration    The following sequence should be followed to configure a DMA CHANNELx (where x is the channel number). In this example I used the DMA and the ADC to sample …

So, there is no need to change the DMA destination (you can't do it anyway while DMA is running), but you'll always be able to tell which half is ready by examining the DMA status bits.


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