STM32U575 FW update over USB Type-C

[ATroš.1]

Hello.

For my project I'd like an option to update firmware on my STM32U575 over USB Type-C connector either with the computer or with the USB flash drive.

Details:

• Board I'm developing has its own power, no power needed from USB. 
• When connected to the computer the communication between the PC and the STM32U575 shall be bidirectional.
• If the flash drive is inserted STM32U575 checks for the firmware update file and performs the FW update automatically.

Questions:

• USB Type-C does not have ID pin. Is FW update possible using USB Type-C?
• According to the schematic in the datasheet (section 3.3) I cannot use USB Type-C or can I?
• If yes, how should I wire my USB Type-C receptacle? Without additional interfaces in the middle if possible.

[FBL · Accepted solution]

Hello @ATroš.1 

IP pin is required for USB OTG when using USB as device and host. Otherwise, if using only USB device, you can implement firmware update using a routine in your firmware or using the USB DFU bootloader.

[ATroš.1]

Additional questions:

1. According to the connections in table 14 in this manual https://www.manualslib.com/manual/2296399/St-Stm32u5.html?page=31#manual will I be able to update the firmware on the STM32U575 in host mode and in device mode? Or just in one of them?
2. What if I use this connection in section 10.3 in this datasheet https://www.st.com/resource/en/application_note/dm00536349-usb-type-c-power-delivery-using-stm32xx-series-mcus-and-stm32xxx-series-mpus-stmicroelectronics.pdf will I be able to update the firmware on the STM32U575 in host mode and in device mode? Or just in one of them?

[Pavel A.]

AFAIK USB in all "normal" Windows systems (not relict WinCE or Windows Phone) acts only as host. So your board has to play device role.