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.