Serial port only works when debugging

[keith v]

Custom app running on a nRF52 devboard. Serial port runs when I use the debugger and continues after I exit the debugger, but does not run from a cold start.

using the Nordic UART FIFO code. NRF_LOG_USES_UART=1 and DEBUG are defined in the C preprocessor settings

flow control disabled

Any ideas? Thanks

[keith v]

Yes the examples work fine, it's definitely something I ( or actually the previous developer did, as it has never worked right )

[FormerMember]

When the chip is running in debug mode, the HFCLK (HF crystal) is constantly running, could the problem be related to the HFCLK?

[smart_life]

Hello I have the same Problem. I use nRF52840, nRF5_SDK_15.0.0_a53641a, nrf5_SDK_for_Mesh_v2.0.1, Python3.5.2 64bit on linux mint 18 64bit. JLink_Linux_V633f_x86_64.

In aci_uart.py I set :  def __init__(self, port, baudrate=115200, device_name=None, rtscts=False):

In Debug-mode it works:

Activating auto-logging. Current session state plus future input saved.
Filename       : log/18-178-8-46_interactive_session.log
Mode           : backup
Output logging : False
Raw input log  : False
Timestamping   : False
State          : active
Python 3.5.2 (default, Nov 23 2017, 16:37:01)
Type 'copyright', 'credits' or 'license' for more information
IPython 6.4.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: send(cmd.Echo("test"))

In [2]: 2018-06-27 08:46:48,476 - INFO - ttyACM0: {event: DeviceEchoRsp, data: {'data': bytearray(b'test')}}

But if i plug out plug-in the device i get :

In [2]: 2018-06-27 08:49:12,153 - INFO - ttyACM0: cmd Echo, timeout waiting for event

in examples/serial/include/sdk_config.h  there are a lot of definitions with UART what exactly should i set to 1, if this is the problem ?

I'm new in this topic and my aim is to receive all the packets in the mesh and to send them to the host pc but first i whant to understand how to work with UART and this Board.

[FormerMember]

When I test ble_app_uart here, RTT works, and nRF_LOG has the following settings:

The log is set to DEFERRED mode, and the LOG is processed in idle_state_handle(). idle_stat_handle_should look like the following for correct processing of the log (bug in ble_app_uart SDK15):

static void idle_state_handle(void)
{
    if (NRF_LOG_PROCESS() == false)
    {
        nrf_pwr_mgmt_run();
    }
}