UM1718 datasheet(95/231 Pages) STMICROELECTRONICS

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UM1718

STM32CubeMX User Interface

230

4.12.4

DMA Configuration window

Click DMA in the Configuration pane to open the DMA configuration window.

This window allows to configure the generic DMA controllers available on the MCU. The

DMA interfaces allow to perform data transfers between memories and peripherals while the

CPU is running, and memory to memory transfers (if supported).

Note:

Some IPs such as USB or Ethernet, have their own DMA controller, which is enabled by

default or via the IP configuration window.

Clicking Add in the DMA configuration window adds a new line at the end of the DMA

configuration window with a combo box proposing to choose between possible DMA

requests to be mapped to peripherals signals (see Figure 74).

Figure 74. Adding a new DMA request

Selecting a DMA request automatically assigns a stream among all the streams available, a

direction and a priority. When the DMA channel is configured, it is up to the application code

to fully describe the DMA transfer run-time parameters such as the start address, etc....

The DMA request (called channel for STM32F4 MCUs) is used to reserve a stream to

transfer data between peripherals and memories (see Figure 75). The stream priority will be

used to decide which stream to select for the next DMA transfer.

DMA controllers support a dual priority system using the software priority first, and in case of

equal software priorities, a hardware priority that is given by the stream number.

UM1718 bảng dữ liệu(PDF) 95 Page - STMicroelectronics