cyw43

WIP driver for the CYW43439 wifi chip, used in the Raspberry Pi Pico W. Implementation based on Infineon/wifi-host-driver.

Current status

Working:

• Station mode (joining an AP).
• Sending and receiving Ethernet frames.
• Using the default MAC address.
• embassy-net integration.
• RP2040 PIO driver for the nonstandard half-duplex SPI used in the Pico W.
• Using IRQ for device events
• GPIO support (for LED on the Pico W)

TODO:

• AP mode (creating an AP)
• Scanning
• Setting a custom MAC address.
• Investigate why can this use higher PIO speed.
• Bus sleep (unclear what the benefit is. Is it needed for IRQs? or is it just power consumption optimization?)

Running the example

• cargo install probe-rs-cli
• cd examples/rpi-pico-w
• WIFI_NETWORK=MyWifiNetwork WIFI_PASSWORD=MyWifiPassword cargo run --release

After a few seconds, you should see that DHCP picks up an IP address like this

11.944489 DEBUG Acquired IP configuration:
11.944517 DEBUG    IP address:      192.168.0.250/24
11.944620 DEBUG    Default gateway: 192.168.0.33
11.944722 DEBUG    DNS server 0:    192.168.0.33

The example implements a TCP echo server on port 1234. You can try connecting to it with:

nc 192.168.0.250 1234

Send it some data, you should see it echoed back and printed in the firmware's logs.

License

This work is licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.