Hello @juvann
First let me thank you for posting .
It sounds like there may be an issue with how you are initializing the IPCC (Inter-Processor Communication Controller) and the USB CDC on the STM32WB55.
It's important to note that the IPCC is used to communicate between the Cortex-M4 and Cortex-M0+ cores on the STM32WB55.
Enabling the IPCC will likely impact the clocks for the Cortex-M4 core, which could be causing the problem with the USB CDC.
One possible solution would be to ensure that the USB clock is properly configured and enabled before calling the IPCC initialization functions. Additionally, you could check the clock configuration settings for the USB peripheral to make sure they are correct.
It's also good to check and make sure that both the Cortex-M4 and Cortex-M0+ cores are configured and enabled correctly, and that they are running at the correct clock speeds.
Another thing you could check is, if possible, try the same operation without enabling BLE. if the problem persists, it is most likely that problem is on the clock configuration, not on the BLE.
NB: For the USB CDC, it is important to configure the USB clock to the correct frequency, typically 48 MHz This clock is derived from the system clock, so it is also important to ensure that the system clock is configured to the correct frequency as well.
Thx
Ghofrane
