Why can't STM32WB55 USB and BLE work at the same time, using firmware version 1.12.0.

[Imen.D]

Hello @垒垒.1,

Do you have still this problem to solve?

Have you an error message ?

Please share more details as much as possible to help you solve your issue.

Imen

[垒垒.1]

HI @Imen DAHMEN

I haven't solved the problem yet !!!! Help me !!

[垒垒.1]

HI @Imen DAHMEN

I haven't solved the problem yet

I'm developing an application which uses both USB CDC and BLE, using an stm32wb55cg USB_Dongle as my current target board. I've started by building two separate applications using STM32CubeMX(STM32Cube_FW_WB_V1.12.0) and stm32wb5x_BLE_Stack_full_fw1.12.0: 

1.CDC be used for the application communicating with PC

2.A BLE P2P client 

Both of these work fine on their own. But if I build an application that includes both components, the USB cdc device will not enumerate properly.

• I've tried some solutions, but they haven't worked, such as :

1. /**
   1. * This prevents the CPU2 to disable the HSI48 oscillator when
   2. * it does not use anymore the RNG IP
   3. */
   4.  
   5. LL_HSEM_1StepLock( HSEM, 5 );

I also found that if I commented out  UTIL_SEQ_Run(UTIL_SEQ_DEFAULT); , USB worked fine, and vice versa.

• The solution of this problem is very important to me, please help me!!!!!

[JPrin.3]

Is this solved already? If so, how?

[垒垒.1]

no
---Original---

[JPrin.3]

You should poll Sem5 until granted before configuring the clock for USB. See AN5289, figure 9. Else M0 will switch it off.

[BStic.2]

This was the answer! Thanks!