How to Read Data Role on USB C

[VH]

Hello,

I am using the NUCLEO-G071RB and the X-NUCLEO-DRP1M1 with the X-CUBE TXPP Software Bundle.

I created my project via the instructions from https://wiki.st.com/stm32mcu/wiki/STM32StepByStep:Getting_started_with_USB-Power_Delivery_Dual_Role.

Everything works fine.

I have a case where my device is always a sink but has to change Data Role. Is there a way to read the data role via the stack? I know that there is a defualt power role, which basically sets the Data Role ( Sink = UFP). And if there is a Data Role Swap Request I could just chnge my variable.Depending ont he Data Role I need to set a ID.

But is there a "nicer" way to read the Data Role from the Stack?

Thanks in advance.

[Roger SHIVELY]

Hello @VH ,

There has been a case created to resolve this question and we will be reaching out to you directly.

Regards,
Roger

[Adam BERLINGER · Accepted solution]

Hello,

you should be able to extract the current data role from the variable DPM_Params[PortNum].PE_DataRole. Usually the PortNum is 0, unless you have multiple ports. This value is automatically updated by the stack.
The parent structure array (DPM_Params) is defined in usbpd_dpm_core.c file.

When the requested data role swap is finished (acknowledged by the other side), the USBPD_DPM_Notification (defined in usbpd_dpm_user.c) is called with value USBPD_NOTIFY_DATAROLESWAP_UFP or USBPD_NOTIFY_DATAROLESWAP_DFP, depending on the new role.

Best regards,
Adam Berlinger