stm32 fsmc dma

The STM32 FSMC (Flexible Static Memory Controller) provides a flexible interface between the microcontroller and various types of external memories, including SRAM, NOR Flash, NAND Flash, and LCD displays. The FSMC supports both synchronous and asynchronous memory interfaces, and it can operate in multiple configurations, such as 8-bit, 16-bit, or 32-bit data bus width.

The DMA (Direct Memory Access) controller is a peripheral that allows data transfers between memory and peripherals without CPU intervention. The DMA controller can be used to transfer data to and from the FSMC interface, which can significantly improve the overall system performance.

To use DMA with FSMC, the DMA controller must be configured to transfer data from the memory to the FSMC interface or vice versa. This can be done using the DMA configuration registers, which allow the user to specify the source and destination addresses, the number of data items to transfer, and other parameters.

Once the DMA controller is configured, it can be triggered to start a data transfer by a software request or by a hardware trigger, such as a timer or a peripheral interrupt. During the data transfer, the DMA controller operates independently of the CPU, allowing the CPU to perform other tasks.

Overall, using DMA with FSMC can improve the performance and efficiency of a system that requires high-speed data transfers between the microcontroller and external memories or displays.