From DREQ to Interrupt: A Full Analysis of the "Express Delivery System" of RP2040 DMA
This article explains RP2040 DMA controller, its working modes, channel chaining, DREQ trigger mechanism and interrupt configuration.
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Project description
【Preliminary Note】The original hardware example in this article was written based on the RP2040. The actual hardware used in this hands-on demonstration features the W55RP20 as the main controller chip. The circuit logic and UF2 flashing operation principles are universally applicable, with only the main controller model differing. The original chip model mentioned in the circuit descriptions below is provided for reference purposes only. DMA The core responsibility of a kernel is to "compute and process tasks". If it is required to manually move data (such as reading data from a sensor and…
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