* 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
1 ACCEPTED SOLUTION
Accepted Solutions
Currently using a
* STM32G071 nucleo board
SUB problem
The larger sub problem was i couldn't figure out how to get the VDM messages to work.
Solution
- use reference example DEMOUCPD with cpu STM32G081 eval board
- make sure your using USBPDCORE_PD3_FULL
- This is a compile part of the library that's linked in the middleware layer
- Enable VDMSupport
- You can do this in the ioc file in the middleware
- Or usbpd_dpm_conf.h
- In usbpd_dpm_userr.c, you need to init USBPD_VDM
USBPD_StatusTypeDef USBPD_DPM_UserInit(void)
{
/* USER CODE BEGIN USBPD_DPM_UserInit */
USBPD_VDM_UserInit(USBPD_PORT_0);
return USBPD_OK;
/* USER CODE END USBPD_DPM_UserInit */
}
- in usbpd_vdm_user.c you need to actually setup the callbacks for this subsystem
USBPD_StatusTypeDef USBPD_VDM_UserInit(uint8_t PortNum)
{
/* USER CODE BEGIN USBPD_VDM_UserInit */
USBPD_PE_InitVDM_Callback(PortNum, (USBPD_VDM_Callbacks *)&vdmCallbacks);
return USBPD_OK;
/* USER CODE END USBPD_VDM_UserInit */
}
At this point you'll need to start defining some of these objects and looking at the eval example will help a lot with it. At this point mixing most of the code in the usbpd_vdm_user.c from the eval project my usb monitor program looks like this. Which was huge! You can see the SNK send back a SVDM discovery identity packet!
Documentation that was really helpful
From the software stack guide
I suggest you the demo provided for G0 eval board, it supports VDM as sink and source pd device.
Currently using a
* STM32G071 nucleo board
SUB problem
The larger sub problem was i couldn't figure out how to get the VDM messages to work.
Solution
- use reference example DEMOUCPD with cpu STM32G081 eval board
- make sure your using USBPDCORE_PD3_FULL
- This is a compile part of the library that's linked in the middleware layer
- Enable VDMSupport
- You can do this in the ioc file in the middleware
- Or usbpd_dpm_conf.h
- In usbpd_dpm_userr.c, you need to init USBPD_VDM
USBPD_StatusTypeDef USBPD_DPM_UserInit(void)
{
/* USER CODE BEGIN USBPD_DPM_UserInit */
USBPD_VDM_UserInit(USBPD_PORT_0);
return USBPD_OK;
/* USER CODE END USBPD_DPM_UserInit */
}
- in usbpd_vdm_user.c you need to actually setup the callbacks for this subsystem
USBPD_StatusTypeDef USBPD_VDM_UserInit(uint8_t PortNum)
{
/* USER CODE BEGIN USBPD_VDM_UserInit */
USBPD_PE_InitVDM_Callback(PortNum, (USBPD_VDM_Callbacks *)&vdmCallbacks);
return USBPD_OK;
/* USER CODE END USBPD_VDM_UserInit */
}
At this point you'll need to start defining some of these objects and looking at the eval example will help a lot with it. At this point mixing most of the code in the usbpd_vdm_user.c from the eval project my usb monitor program looks like this. Which was huge! You can see the SNK send back a SVDM discovery identity packet!
Documentation that was really helpful
From the software stack guide
