USB PD enable display port [STM32N6 - SNK]

[Brenden_PLUS]

* board - STM32N6570-DK

*  using STM Cube 1.19.0

* Example - USBPD_SNK

Goal - to enable Display port

Problem - is i'm getting stuck with the current example.  It gets stuck at SVDM_deiscovery_identity part.  Which in that packet i should be able to start to tell the host that i have display port capability, but i what is currently set it that the message is unsupported.  How would i go about enabling this.

Thoughts - In usbpd_vdm_user.c it seems like it has all the stuff that i need to start sending back these kind of messages but they don't seem to be called anywhere.  

There's a function called

* USBPD_VDM_DiscoverSVIDs()

But it doesn't seem to be called.  

Capture from  a STM32 PD G0 - with STM32CubeMonitor app

[Brenden_PLUS]

In usbpd_dpm_conf.h it seems you can edit the DPM_Settings.

So i enabled 

.PE_VDMSupport = USBPD_TRUE,

.PE_RespondsToDiscovSOP = USBPD_TRUE, /*!< Can respond successfully to a Discover Identity */ .PE_AttemptsDiscovSOP = USBPD_TRUE,

None of these made any further changes.  

[FBL]

Hi @Brenden_PLUS 

It seems we are getting strange behavior running the example ! An internal ticket is submitted to dedicated team (221407) for further investigation. 

About USBPD_VDM_DiscoverSVIDs API is called to retrieve SVID supported by device and answer to SVDM Discovery SVID init message sent by port partner

[Brenden_PLUS]

Do you have any info on whats weird about it?  I've currently moved to a different task, but figuring out this PD is very important to the project.  Just want to make sure this problems is or is not impeding my progress on my task. 

[FBL]

Hi @Brenden_PLUS 

I assume this line, __HAL_PWR_GET_FLAG(PWR_FLAG_USB33RDY) returns true if PWR_FLAG_USB33RDY is set. So, if the flag is set, the code is stuck in the instruction while(__HAL_PWR_GET_FLAG(PWR_FLAG_USB33RDY));

If the code is waiting for the flag to be set, a simple correction could be

 while(!__HAL_PWR_GET_FLAG(PWR_FLAG_USB33RDY));

Keep me updated, if you have further questions.

[Brenden_PLUS]

What i'm trying to currently figure out is how to to setup this software so that it supports a SVDM_DISCOVERY_IDENTITY response.  In the image from the first post you can see it replay's with a NOT_SUPPORTED response.

So i tried to do set in

* usbpd_dpm_conf.h

.PE_VDMSupport = USBPD_TRUE,

.PE_RespondsToDiscovSOP = USBPD_TRUE,

.PE_AttemptsDiscovSOP = USBPD_TRUE,

But they didn't do anything or at least i couldn't figure out what they did.  How do i enable or set the SVDM_DISCOVERY_IDENTITY as a sink pd device?

[FBL]

Hi @Brenden_PLUS 

I suggest you the demo provided for G0 eval board, it supports VDM as sink and source pd device.