USBX drives CDC-ECM device as USB host

[rk3399]

When the CDC-ECM device reports the MAC address to USBX, the whole system stops. I would like to know what is the reason for this. My guess is that USBX is waiting for the CDC-ECM device to report the network connection status. But the CDC-ECM device doesn't do that. If my guess is correct, can you tell me where to find documentation on the CDC-ECM protocol, thanks! (From Google Translate, the following is the original Chinese text.)

当CDC-ECM设备向USBX报告MAC地址后，整个系统便停止了。我想知道这是什么原因。 我的猜测是USBX在等待CDC-ECM设备报告网络连接状态。但CDC-ECM设备并没有这样做。如果我的猜测是对的，可以告诉我在哪里能找到关于CDC-ECM协议的文档吗，感谢！

[rk3399]

何时会从这个等待返回

[xiaocq2001]

See ux_host_class_cdc_ecm_interrupt_notification.c, the semaphore is put when there is interrupt transfer notification about link state changes.

[xiaocq2001]

Please check CDC1.2_WMC1.1_012011.zip on USB.org for CDC ECM spec.

[rk3399]

Please check CDC1.2_WMC1.1_012011.zip on USB.org for CDC ECM spec. Thanks, this solved my doubt!