STM32F4-Discovery UART receive by DMA with included start-marker as well as an end-marker

No, the DMA controller cannot check the value of the data and stop or interrupt when a delimiter or marker byte is received. The DMA controller can only copy the received byte to memory. If you want to read variable length packets between delimiters then you need to use the CPU to check whether each byte is a delimiter. You can use the UART’s RX interrupt to check for the delimiter as each byte is received.

DMA might be useful for receiving a continuous stream of bytes or a packet of known length.

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