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embassy-usb: add CDC-ECM device and host class drivers - #7496
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leftger
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November 10, 2026 19:06
leftger
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November 11, 2026 09:27
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Summary
Adds the USB Communications Device Class - Ethernet Control Model (CDC-ECM, class 0x02, subclass 0x06) to
embassy-usb, supporting both device and host roles:class::cdc_ecm::device): Exposes raw Ethernet frame communication over USB bulk endpoints (no NTB encapsulation needed, unlike CDC-NCM). Integrates withembassy-net-driver-channelviainto_embassy_net_device(), allowing full TCP/IP networking withembassy-net. Handles standard ECM control requests (SET_ETHERNET_PACKET_FILTER,SET_ETHERNET_MULTICAST_FILTERS) and MAC address string conversion.class::cdc_ecm::host): ImplementsEcmMatcherandEcmHostdriver capable of attaching to USB Ethernet adapters, cellular 4G/LTE modems in ECM mode, and embedded devices running ECM gadget mode. Also providesinto_embassy_net_device()to pipe USB Ethernet directly intoembassy-net.