acaa8b3e8b
total_len is already rounded up, so the `+ 3` is not needed. And even if it was, the calculation should have been `((total_len + 3) / 4)`. `(total_len + 3 / 4)` is equivalent to `total_len` and can overflow the slice, leading to a panic which can easily be triggered by sending large ICMP ECHO packets to the device.
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-netintegration.
TODO:
- AP mode (creating an AP)
- GPIO support (used for the Pico W LED)
- Scanning
- Setting a custom MAC address.
- RP2040 PIO driver for the nonstandard half-duplex SPI used in the Pico W. Probably porting this. (Currently bitbanging is used).
- Using the IRQ pin instead of polling the bus.
- 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-runcd examples/rpi-pico-wWIFI_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.