USB HNP problem on STM32?

[zoltan2]

Hi,

I am trying to use Host Negotiation Protocol on STM32 boards.

Two boards are connected together stm32f4-discovery (A-device) and stm32f429i-disc1 (B-Device). VBUS sensing, HNPCAP is enabled at both side.

DHNPEN bit in GOTGCTL register is enabled after SetFeature(HNP Enable) received at B-Device and HSHNPEN is set after SetFeature(HNP Enable) ACK received at A-Device.

I see, that 7.5 ms after Suspending bus D+ goes low resulting SE0 state.

But 4 ms SE0 state D+ goes high, and no OTG interrupt fired on A-Device side.

On B-device side I see HNSSCHG interrupt, but HNGSCS flag in GOTGCTL register is 0 (HNP failed). I think the reason is, that A-Device doesn't apply Pull-up within 3 ms.

What can be the reason for this behaviour? What I missed to set up to get working HNP?

Thanks in advance.

Zoltan

[waclawek.jan]

You probably have a much deeper understanding of the OTG machine of the Synopsys USB module than anybody else here, so don't hold your breath waiting for a relevant answer.

For the less relevant ones, have you had a look at the OTG part of the SPL-based en.stm32_f105-07_f2_f4_usb-host-device_lib.zip ?

JW

[zoltan2]

Hi Jan,

Thanks for replying.

I already know this code, and double checked if it matches my code.

Unfortunately I haven't found any working example for HNP on STM32, which could be helpful for me.

Best Regards

Zoltan

[MChoh]

Hi Mr. Zoltan,

I am facing the exact same problem that no OTG interrupt is fired on the A-Device. Did you manage to get OTG working? It would be great if you can help me. Thanks.

Best Regards,

Mughees