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Raspberry Pi Pico W as USB Wi-Fi Adapter
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Pico-usb-wifi is firmware for the Raspberry Pi Pico W that turns it into a driverless USB Wi-Fi adapter, enumerating as a USB CDC-NCM device.
Key facts
- The bridge runs over the RP2040’s native Full-Speed USB (12 Mbit/s), so throughput tops out around 4-5 Mbit/s of TCP payload
- ample for a dashboard or control surface, but a hard ceiling
- Transparent Layer-2 Bridging between the Pico W’s wireless and USB interfaces
- Out-of-band management and debug consoles over CDC-ACM serial; see Management Console and Debug Console
- High-water mark of the Wi-Fi-to-host USB-TX queue depth (out of 32)
Summary
The firmware works as a transparent layer-2 bridge that forwards frames between the Pico W’s wireless interface and its USB interface. No host-side driver, kernel module, or wireless stack is required; see No Host-Side Wi-Fi Stack. IPv4 and IPv6 with no NAT, no private subnet, and no port-forwarding to configure.