Hello, I've seen, that the USBX host stack supports the ASIX AX88772B chip. Our goal is to connect an USB-to-LAN-converter to an STM32H7-Controller. So I setup everything (ThreadX, NetXDuo and USBX) and the AX88772B gets initialized without any issues in the setup routine (_ux_host_class_asix_setup). But as soon as I plug in the ethernet cable, the following is happening: I get an notification interrupt, that a cable was plugged in and the link state is set to UX_HOST_CLASS_ASIX_LINK_STATE_PENDING_UP (_ux_host_class_asix_interrupt_notification) A TX-Thread sets the state to UX_HOST_CLASS_ASIX_LINK_STATE_UP (_ux_host_class_asix_thread) But approximately 250ms after the UX_HOST_CLASS_ASIX_LINK_STATE_PENDING_UP was set, I receive another interrupt that says, that the link is down. And the link state goes to UX_HOST_CLASS_ASIX_LINK_STATE_PENDING_DOWN I tried out some stuff but nothing seems to help. It seems, that this "link-down"-interrupt is independend from what is happening in _ux_host_class_asix_thread. Must I poll the device in a certain way? Is there also a detailled documentation how to use the ASIX on USBX in a good way? Thanks for your help. Patrick

USBX with Asix AX88772B not working on an STM32H723

Patrick 1

Hello,
I've seen, that the USBX host stack supports the ASIX AX88772B chip. Our goal is to connect an USB-to-LAN-converter to an STM32H7-Controller.

So I setup everything (ThreadX, NetXDuo and USBX) and the AX88772B gets initialized without any issues in the setup routine (_ux_host_class_asix_setup).
But as soon as I plug in the ethernet cable, the following is happening:

I get an notification interrupt, that a cable was plugged in and the link state is set to UX_HOST_CLASS_ASIX_LINK_STATE_PENDING_UP (_ux_host_class_asix_interrupt_notification)
A TX-Thread sets the state to UX_HOST_CLASS_ASIX_LINK_STATE_UP (_ux_host_class_asix_thread)
But approximately 250ms after the UX_HOST_CLASS_ASIX_LINK_STATE_PENDING_UP was set, I receive another interrupt that says, that the link is down. And the link state goes to UX_HOST_CLASS_ASIX_LINK_STATE_PENDING_DOWN

I tried out some stuff but nothing seems to help. It seems, that this "link-down"-interrupt is independend from what is happening in _ux_host_class_asix_thread.

Must I poll the device in a certain way?

Is there also a detailled documentation how to use the ASIX on USBX in a good way?

Thanks for your help.
Patrick

Xiuwen Cai 366 Reputation points Microsoft Employee

2021-08-19T09:18:10.957+00:00

Hi Patrick, does your USB to LAN adapter have a LED that indicates the link state? If so, is that still on when you get link down interrupt?
Patrick 1 Reputation point

2021-08-19T09:21:43.353+00:00

Yes, there is an LED and it is still on after the link down interrupt was received.
Xiuwen Cai 366 Reputation points Microsoft Employee

2021-09-03T03:36:17.707+00:00

Hi Patrick, we identified some issues in the USBX ASIX class. We are working on it.