Initial Pico/2 W Bazel support

[armandomontanez]

Builds out initial Bazel support for Pico W wireless libraries. With these changes, it's now possible to produce working Wifi and Bluetooth applications for Pico W boards.

[armandomontanez]

Okay, marking this as ready for review since it's a pretty big step forward now. I've gotten BLE and Wifi examples working in pico-examples, I'm totally down to send out a PR for that later.

There's still a little more to go:

• MbedTLS hasn't been hooked up/tested.
• FreeRTOS interactions with the wireless libraries hasn't been tested.
• Gatt header compilation works for independent gatt files. If a gatt file depends on another, there's no way to get it (yet).
• Need to properly pin Python PIP dependencies for the gatt header creation.

[kilograham]

thx

[RyanDraves]

@armandomontanez, do you have BUILD files for the BLE & Wifi examples? I'm able to compile an example, but it's crashing on cyw43_arch_init for some unknown reason. I have these config options set:

        "--@pico-sdk//bazel/config:PICO_BT_ENABLE_BLE=True",
        "--@pico-sdk//bazel/config:PICO_BOARD=pico_w",
        "--@pico-sdk//bazel/config:PICO_BTSTACK_CONFIG=//project:btstack_config",

where btstack_config is just pulled from the examples. Is there additional configuration options that need to be set? I've found no projects on Github using this yet to reference

Happy to open an issue if that's preferred

[armandomontanez]

Try setting --@pico-sdk//bazel/config:PICO_MULTICORE_ENABLED=False. I was considering flipping the default to False for this reason. Wireless works with multicore support, but IIRC you have to either 1) flip some other configuration flags or 2) be careful about your init order.

I was testing against a bunch of the examples in pico-examples, I just put up a draft PR here: raspberrypi/pico-examples#587

[armandomontanez]

I filed #2139 to leave a breadcrumb.

[RyanDraves]

Thanks for the tips. I tried adding --@pico-sdk//bazel/config:PICO_MULTICORE_ENABLED=False without any luck. I was able to build and run the standalone example from your PR though; I'll go searching for the discrepancy and update here and/or the ticket when I find it

[RyanDraves]

I have it building now from my toy examples as well. My last issue was unrelated; --@pico-sdk//bazel/config:PICO_MULTICORE_ENABLED=False was the relevant fix. Thanks!