Burst-Transfer DMA Firmware

I need compact, well-documented DMA firmware whose sole job is efficient data transfer. The code must be tuned for burst transfers and interface cleanly with an SPI peripheral.

The microcontroller already exposes a DMA engine; what’s missing is the firmware layer that sets up channels, kicks off each burst at the right moment, and signals completion back to the application. Timing is critical, so I expect zero-copy handling, minimal CPU intervention, and clear interrupt-driven logic.

Please write in C (or C++ if you can justify it) and include concise inline comments plus a short README that explains register usage, buffer alignment requirements, and how to scale the solution if I later choose to add UART or I2C.

Deliverables:
• Source code ready to build with my existing toolchain
• README covering setup, configuration constants, and an example burst transaction
• A brief test routine that proves stable transfers on SPI at the target clock rate

I’m happy to answer hardware-specific questions once you’re on board; let’s keep the first milestone focused on getting reliable bursts moving over SPI.