nRF52840 communicate with gateway via USB

[Deang]

When I was testing USB on SDK16.0 with nrf52840, the gateway acted as the host, the following scenario 1 worked abnormally, and scenario 2 worked normally.

Scenario 1: When the USB host first sends more than 8 bytes of data to the device, the device goes into a suspended state;

Scenario 2: The device sends a request (8 bytes in length) to the host, the device responds to 4K data, and the host returns 4K data received.

Why does this happen?

Best Regards

[Jørgen Holmefjord]

Hi,

Can you provide some more details on what occurs in scenario 1, and provide an example with instructions on how to reproduce this?

Best regards,
Jørgen

[Deang]

Hi Jorgen,

Thanks you.  scenario 1 can repeat in “nordic_SDK_160\examples\peripheral\usbd_ble_uart”,  but there will be no problem communicating with PC

In the figure below, after the gateway open the device and delays for 1 second, it sends 4K datas to the device, but after sending a few hundred bytes, the USB bus is suspended and the reception fails.

[Deang]

Hi Jorgen,

Can you offer me some advice?

Is USB device configured incorrectly? Or is the gateway configured incorrectly? Or do these two configurations not match? or for any other reason.

[Jørgen Holmefjord]

Can you make sure that you are using production-revision of the nRF52840 chip? The Engineering samples have had many issues with the USBD peripheral. 

Can you also provide more details on the gateway device? What manufacturer/model is the USB Host device, and how does it communicate with the USB device?

[Deang]

Hi Jorgen, thank you for your response.

The silkscreen on this chip is: N52840 - QIAAD0 - 1851AA.
The chip of the gateway is MT7621.