ports/stm32: Add Zephyr BLE support for WB55 and PYBD.#20
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Cleanup unused functions, macros and debug helpers that were never called or only conditionally compiled behind disabled feature flags. Removes dead registry system, PSA crypto stubs, LIFO operations, and various unused helper functions and inlines from kernel/device/config headers. Also deletes gatt_pragma.h which is unreferenced. Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
Add Zephyr BLE variant configuration for PYBD_SF6 board, with HCI UART readpacket support for bulk reading from the BT coprocessor. Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
Update mp_handle_pending() calls to use the mp_handle_pending_behaviour_t enum instead of bool, matching the current signature in py/scheduler.c. Add mp_bluetooth_zephyr_l2cap_flush_recv_notify() call to port_run_task, consistent with RP2 and nRF ports. Without this, deferred L2CAP recv notifications were never delivered to Python. Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
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Use ZEPHYR_BLE_POLL_INTERVAL_MS for poll timer values. Enable CONFIG_BT_AUTO_DATA_LEN_UPDATE for NUCLEO_WB55. Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
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Summary
Adds Zephyr BLE integration for the STM32 port, targeting the NUCLEO_WB55 and PYBD_SF6 boards. The WB55's BLE controller runs on the M0+ coprocessor (CPU2) and communicates with the M4 host via IPCC mailbox — the HCI driver in
mpzephyrport.cbridges this to the Zephyr BLE host's H4 transport.The IPCC/rfcore integration required careful handling of the CPU2 lifecycle: HCI_Reset must not be sent to CPU2 as it corrupts all 192KB of SRAM1. This is prevented by a
drv_quirk_no_reset()hook in the Zephyr host'shci_core.c.Build variants:
NUCLEO_WB55 BOARD_VARIANT=zephyr_bleandPYBD_SF6 BOARD_VARIANT=zephyr_ble.Depends on #19.
Testing
11/11 BLE multitests passing on WB55 with nRF52840 DK as peripheral. PYBD variant builds but has not been tested with Zephyr BLE (PYBD is primarily used as a NimBLE reference central).
Trade-offs and Alternatives
The STM32 integration touches several files beyond the BLE-specific code (linker scripts, FreeRTOS hooks, system_stm32 changes) because the WB55's dual-core architecture and IPCC memory layout require careful memory section placement. These changes are guarded by
MICROPY_BLUETOOTH_ZEPHYRdefines where possible.Generative AI
I used generative AI tools when creating this PR, but a human has checked the code and is responsible for the description above.