ULPI on the STM32H7B0 using USB3300

[Claydonkey]

I had success when using the ULPI interface on a STM32H7A3 (on the nucleo board) using an external ULPI transceiver board https://www.waveshare.com/usb3300-usb-hs-board.htm

but when porting over to the STM32H7B0, I am not having much success. I believe the only difference between the chips are that the 7B0 uses PC2_N and PC3_N which I have set as digital during initialization using the HAL

HAL_SYSCFG_AnalogSwitchConfig(SYSCFG_SWITCH_PC2, SYSCFG_SWITCH_PC2_CLOSE);
  HAL_SYSCFG_AnalogSwitchConfig(SYSCFG_SWITCH_PC3, SYSCFG_SWITCH_PC3_CLOSE);

also I have set the CRS sync source to USB HS with the same result

[Port6] FailedEnumeration : Unknown USB Device (Device Descriptor Request Failed)

The external board has been known to arrive DOA judging from other posts in this forum but it worked a couple of weeks ago on the H7A3 variant.

Are there any other concerns I should be aware of when using the ULPI on a H7B0 (VBTx)?

[Imen.D]

Hello @Claydonkey​ ,

Which STM32H7B0 line are you using ?

According to the STM32H7B0xB datasheet, for STM32H7B0 the ULPI is not supported for 100/144 packages, but This is not applied on all STM32H7 Packages.

I advise you to check the available pins/balls in "Table 7. STM32H7B0xB pin/ball definition", and the note related to ULPI interface availability on packages that do not feature PC2 and PC3 I/Os, in Table. STM32H7B0xB features and peripheral counts. 

 

When your question is answered, please close this topic by choosing Select as Best. This will help other users find that answer faster.

Imen

[Claydonkey]

According to the datasheet, ULPI is available for this 100pin variant...

[Claydonkey · Accepted solution]

Thanks for your suggestion Imen.

I have successfully got the two to talk... The traces (wires) were over 3 inches long in my initial setup and hence out of spec. I hardwired some small 1 inch wires between the two boards and bingo ULPI and USB HS are working.