A Complete Guide to USB Protocol: Demystifying the Universal Serial Bus — From History and Architect
This article explains USB three-layer architecture, four endpoint transfer modes, descriptor types, six device states and full enumeration workflow for host-dev
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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. 1. USB Communication Layers The USB protocol consists of multiple layers, mainly including the following layers: Among them, from the bottom layer to the…
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