USB_OTG_HS and STM32CubeMX

This topic has 4 replies, 2 voices, and was last updated 2 years, 3 months ago by Neeraj Dantu.

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- August 1, 2022 at 10:45 am #12579
  gil_he
  Participant
  hello,
  I have a USB-C connector connected to USB_DP2/DM2 in the OSD32MP157C.
  The interface is used as USB HS OTG, slave only, with Dual_Role_Device option.
  The USB-C connector uses only DP/DM and VBUS and these are connected to the Octavo.
  1. In the STM32CubeMX I defined USB_OTG_HS only in A7NS (Linux).
  I get the message: “Status: Partly disabled conflict with: SDMMC2: Mode MMC 8 bits Wide bus”.
  I am also using eMMC Flash on SDMMC2 (which is defined in all stages: BOOT ROM , FSBL and A7NS).
  What is the meaning of this status?
  2. I chose OTG/Dual_Role_Device Type C (we are using a type C connector).
  Should I check “Activate_SOF” and/or “Activate_VBUS”?
  thank you
  Gil
- August 2, 2022 at 4:52 am #12581
  gil_he
  Participant
  hello Neeraj,
  In addition to the above:
  It seems there is an issue with PA8 I chose for SDMMC2_D4.
  When choosing PB8 or PE4 the conflict is not there.
  PA8 also occupies the role of OTG_HS_SOF.
  If PA8 is used as SDMMC2_D4, OTG_HS_SOF cannot be asserted externally.
  However, internally, this token can be used and is used as part of the protocol.
  Am I correct with all that I wrote?
  Will we have an issue with our USB interface?
  thanks,
  Gil
  - This reply was modified 2 years, 3 months ago by gil_he.
- August 3, 2022 at 11:02 am #12588
  Neeraj Dantu
  Moderator
  Gil,
  “Status: Partly disabled conflict with: SDMMC2: Mode MMC 8 bits Wide bus“: This kind of error occurs when there is a pin conflict, which means you are trying to use the same pin in 2 interfaces. In this case PA8 is needed for OTG_HS_SOF. You can move the SDMMC2_D4 to other pins that are available.
  Please check whether you need SOF function as in most cases/reference designs, it is not used to implement a generic USBC interface. See https://www.st.com/resource/en/application_note/dm00389996-getting-started-with-stm32mp151-stm32mp153-and-stm32mp157-line-hardware-development-stmicroelectronics.pdf USB chapter for more information on USB use cases.
  Best,
  Neeraj
- August 4, 2022 at 12:34 pm #12590
  gil_he
  Participant
  Hi Neeraj,
  The design is over. For the current board revision.
  SDMMC2_D4 is routed to PA8.
  If I do not need this functionality, can I use the USBS interface without any issues?
  There is no SOF pin on the USBC connector. Does a design that do use this functionality, need to route some signal to this pin? (internally in the board).
  thanks,
  Gil
- August 8, 2022 at 1:01 pm #12593
  Neeraj Dantu
  Moderator
  Gil,
  SOF pin serves as an indicator to indicate a start of frame and not needed for core USB function. You can use the pin for SDMMC.
  Best,
  Neeraj
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