Could you provide the backtrace log?

QueueHandle_t red_line_queue; This simply declares a Queue handle, and does not create a queue. Before attempting use "red_line_queue" in any queue function, you need to ensure that the queue is created. You can do this by calling `xQueueCreate()` which creates a queue and returns a handle to the c...

Where do you call xQueueCreate() to actually create the queue?

Hub support is still on our todo list. See the USB Host Library documentation for more details.

The size of the TCB depends on configuration, so use `sizeof(StaticTask_t)` to get the TCB size at compile/run time

TWAI 所有收到的包都会写进去一个 RX Queue 里, 而且所有发出的包都会先写进一个 TX Queue。RX Queue 和 TX Queue 的大小都可以通过 twai_general_config_t 的 tx_queue_len 和 rx_queue_len 配的。

That setting enables Amazon SMP FreeRTOS, an SMP version of FreeRTOS written by Amazon themselves (see docs). If disabled, then IDF FreeRTOS is run instead, this is a modified version of FreeRTOS written by us that also supports SMP.

The the chip revision of the ESP32 chip on each board the same (i.e., what ECO version are the ESP32's)?

@marbalon In theory we could add this workaround, but the way I would prefer implementing this as follows: Integrate this workaround into the hub driver (i.e., where enumeration is handled) so that users don't need to handle this in their class drivers Make it an optional workaround via menuconfig H...

From what I can see, the "hcd_var == 2" means that it's currently set to the value of "URB_HCD_STATE_INFLIGHT". The "URB_HCD_STATE_INFLIGHT" state means that the URB has already been filled into one of the HCD's DMA lists. So the URB could either be: Already transmitting on the USB bus, but can get ...