Bluetooth on PicoW Support

Enabling Bluetooth

To enable Bluetooth (BT), use the Tools->IP/Bluetooth Stack menu. It requires around 80KB of flash and 20KB of RAM when enabled.

Both Bluetooth Classic and BluetoothBLE are enabled in btstack_config.h.

Included Bluetooth Libraries

You may use the KeyboardBT, MouseBT, or JoystickBT to emulate a Bluetooth Classic HID device using the same API as their USB versions.

You may use the KeyboardBLE, MouseBLE, or JoystickBLE to emulate a Bluetooth Low Energy (BLE) HID device using the same API as their USB versions.

The SerialBT library implements a very simple SPP (Serial Port Profile) Serial-compatible port.

Connect and use Bluetooth peripherals with the PicoW using the BluetoothHIDMaster library.

BluetoothAudio (A2DP) is also supported, both sink and source.

Writing Custom Bluetooth Applications

You may also write full applications using the BTStack standard callback method, but please be aware that the Raspberry Pi team has built an interrupt-driven version of the BT execute loop, so there is no need to actually call btstack_run_loop_execute because the async_context handler will do it for you.

There is no need to call cyw43_arch_init in your code, either, as that is part of the PicoW variant booting process.

For many BTStack examples, you simply need call the included btstack_main() and make sure that hci_power_control(HCI_POWER_ON); is called afterwards to start processing (in the background).

You will also need to acquire the BT async_context system lock before calling any BTStack APIs. __lockBluetooth and __unlockBluetooth are provided in the PicoW variant code.

Note that if you need to modify the system btstack_config.h file, do so in the tools/libpico directory and rebuild the Pico SDK static library. Otherwise the change will not take effect in the precompiled code, leading to really bad behavior.