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CYW43xx WiFi SoC driver
=======================
This is a driver for the CYW43xx WiFi SoC.
There are four layers to the driver:
1. SDIO bus interface, provided by the host device/system.
2. Low-level CYW43xx interface, managing the bus, control messages, Ethernet
frames and asynchronous events. Includes download of SoC firmware. The
header file `cyw43_ll.h` defines the interface to this layer.
3. Mid-level CYW43xx control, to control and set WiFi parameters and manage
events. See `cyw43_ctrl.c`.
4. TCP/IP bindings to lwIP. See `cyw43_lwip.c`.
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