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Direct Memory Access (DMA)

Definition

A hardware peripheral that transfers data between memory regions or between peripherals and memory without CPU intervention. Frees the CPU to do other work during bulk transfers (ADC sampling, UART RX, SPI communication).

Why it matters

DMA bugs are among the hardest to diagnose in firmware. Cache coherency issues, channel priority conflicts, and incorrect transfer configurations cause intermittent data corruption that only appears under load.

Relevant MCU families

STM32ESP32NXP i.MX RTMicrochip SAM

Related problems

DMA Cache Coherency
DMA writes to memory while the CPU reads from stale cache. Data looks correct in the debugger but fails at runtime. Intermittent CRC failures nobody can explain.

Other terms

Stack WatermarkingHardFault HandlerMISRA C

AI tools that understand direct memory access (dma)

usefirmware's AI is built with deep knowledge of direct memory access (dma) and every other firmware concept. Not a general tool learning firmware on the fly.

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