STM32WB55 using HSE for BLE, Disconnected (reason 0x08)

[gadifrish]

Hi everyone,

I’m trying to run the Bluetooth shell test on a Nucleo-WB55RG with HSE (no LSE crystal) under Zephyr, I’ve disabled low-power modes (CONFIG_PM=n), but I still get an immediate disconnect after 'got remote features' (reason 0x08).

My DTS overlay:

&ble_rf {
    status = "okay";
    clocks = <&rcc STM32_CLOCK(AHB3, 20)>,
             <&rcc STM32_SRC_HSE  RFWKP_SEL(3)>;
};

&rtc {
    status = "okay";
    clocks = <&rcc STM32_CLOCK_BUS_APB1 0x100000>,
             <&rcc STM32_SRC_HSE      RTC_SEL(3)>;
};

With LSE: init → advertising → connect → feature exchange → works.
With HSE: init → advertising → connect → feature exchange → immediate disconnect (0x08)

I’ve tried disabled Bluetooth features in prj.conf (still same result 0x08).

1. Is there a known-working DTS overlay example for WB55 + HSE in Zephyr?
2. Am I missing any patches, Kconfig flags or clock/devider settings?
3. Any pointers to sample code or tests that use the HSE path successfully?

@erwango

Thanks in advance!

[erwango]

@asm5878 FYI