60 lines
2.2 KiB
ReStructuredText
60 lines
2.2 KiB
ReStructuredText
WiFi (Raspberry Pi Pico W) Support
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==================================
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WiFi is supported on the Raspberry Pi Pico W by selecting the "Raspberry Pi Pico W" board in the Boards Manager. It is generally compatible with the `Arduino WiFi library <https://www.arduino.cc/en/Reference/WiFi>`__ and the `ESP8266 Arduino WiFi library <https://github.com/esp8266/Arduino>`__.
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Enable WiFi support by selecting the `Raspberry Pi Pico W` board in the IDE and adding ``#include <WiFi.h>`` in your sketch.
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Supported Features
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------------------
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* WiFi connection (Open, WPA/WPA2)
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* Static IP or dynamic DHCP supported
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* Station Mode (STA, connects to an existing network)
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* Access Point Mode (AP, creates its own wireless network) with 4 clients
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* WiFi Scanning and Reporting
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* See the ``ScanNetworks.ino`` example to better understand the process.
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Important Information
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---------------------
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Please note that WiFi on the Pico W is a work-in-progress and there are some important caveats:
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* Adding WiFi increases flash usage by over 220KB
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* There is a 220KB binary firmware blob for the WiFi chip (CYW43-series) which the Pico W uses, even to control the onboard LED.
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* Adding WiFi increases RAM usage by ~40KB.
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* LWIP, the TCP/IP driver, requires preallocated buffers to allow it to run in non-polling mode (i.e. packets can be sent and received in the background without the application needing to explicitly do anything).
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* The WiFi driver is a little limited as of now, but fully functional for sending and receiving data
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* Extensible Authentication Protocol (EAP) is not supported
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* Combined STA/AP mode is not supported
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* Multicore is supported, but only one core may run ``WiFi`` code.
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* FreeRTOS is not yet supported due to the requirement for a very different LWIP implementation. PRs always appreciated!
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The WiFi library borrows much work from the `ESP8266 Arduino Core <https://github.com/esp8266/Arduino>`__ , especially the ``WiFiClient`` and ``WiFiServer`` classes.
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Special Thanks
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--------------
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Special thanks to:
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* @todbot for donating one of his Pico W boards to the effort
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* @d-a-v for much patient explanation about LWIP internals
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* The whole ESP8266 Arduino team for their network classes
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* Adafruit Industries for their kind donation
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