USB PD Reseting issue

[HGorl.1]

Hi Stmteam,

I am using Stm32G081RB to Develop Source application.

please have a look at the source files and trace.

provider_port1

Note : trace file is from sink device attached to the Source Device currently we are looking to Develop complete solution.

Questions:

1. we couldn't see the PS_RDY msg from source device after the Power Setting across the VBUS. is there any timings to be met for Power establishment after Port negotiation with connected port partner?

Note : ADC reading after the power establishment is proper. I make sure the voltage read by the USBPD stack is correct by putting break point at BSP_PWR_VBUSGetVoltage in usbpd_pwr_user.c file.

Kindly don't hesitate to revert back (at any time) for more information about the product.

Thanks and Regards

Himavanth

[HGorl.1]

Hi Yohan M,

here is our trace from source side. still we are not able to view PS_RDY message.

Kindly help us out in debugging the application.

Thank you

• Himavanth

[Yohann M.]

Hi @HGorl.1​ 

Nice to see that now you are able to get the trace.

It seems that PE does not have time to send the PS_RDY. There is CC detach during the power transition after 12ms !?

1796 PE 25877 1 PE_SRC_SEND_CAPABILITIES

1797 OUT 25879 1 SRC_CAPABILITIES  DATA:2C9101222CD102002CB104003C2176C0 / 5V - 3A / 9V - 3A / 15V - 3A / [3.3V - 5.9V] - 3A SOP PD3   H:0x41A1   

1798 IN 25880 1 GOODCRC SOP   H:0x0001   

1799 NOTIF 25880 1 SRCCAP_SENT

1800 PE 25880 1 PE_SRC_WAIT_REQUEST

1801 IN 25882 1 REQUEST DATA: 96580231 / ObjectPosition:3 / GiveBack:0 / CapabilityMismatch:0 / USBCommunicationCapable:0 / NoUSBSuspend:1 / UnchunkedExtendedMessagesSupported:0 SOP PD3   H:0x1082   

1802 OUT 25882 1 GOODCRC SOP   H:0x0121   

1803 PE 25883 1 PE_SRC_NEGOTIATE_CAPABILITY

1804 OUT 25883 1 ACCEPT SOP PD3   H:0x03A3   

1805 IN 25884 1 GOODCRC SOP   H:0x0201   

1806 NOTIF 25884 1 REQUEST_ACCEPTED

1807 PE 25884 1 PE_SRC_TRANSITION_SUPPLY

1808 EVENT 25896 1 EVENT_DETACHED

Do you have a protection on your CC lines which can disconnect them?

Did you try at least to get a contract at 5V only? To do it, you could expose only the 1st PD0 in your source capabilities!

Regards,

Yohann

[Yohann M.]

One more point... you use an old version of our stack... Can you try to adapt your applications with latest stack I delivered with the ZIP file (USBPD _provider_port1_ST.7z) I sent to you on 25th of September?