Reset during UART send/receive

[toruish]

I wrote UART echo sample based on ble_app_uart_c for S140/nRF52840-DK.

When nRF52 receive one line on USB/UART, it send same line to USB/UART.

I also write Linux socket sample for keep send/receive one text line to /dev/ttyACM0.

On normal condition, both sample works fine. I can see echoed line on Linux terminal.

But when I press "IF BOOT/RESET" during USB/UART is busy. nRF52 goes unstable condition.

On next open /dev/ttyACM0 is success, but no echo back. 

This unstable condition continues until power cycle on nRF52.

Do you know how to prevent becoming unstable condition?

I use nRF52840-DK, PCA10056 1.1.0

Thanks,

[Jared]

Hi,

Which SDK version are you using? Could you try the suggestion in this thread and see if the issue is still persistent.

regards

Jared

[toruish]

I use SDK 15.3.

Do you know nrf_drv_usbd_errata.h::nrf_drv_usbd_errata_type_52840_fp1 issue is fixed on 15.3?

[Jared]

Hi,

It should be fixed in the newest SDK. Do you experience the same issue with the unmodified example from the SDK? 

regards

Jared