Testing an application
Follow the instructions in the testing section of the application’s documentation to make sure that the application runs as expected.
Information about the current state of the application is usually provided through the LEDs or through UART, or through both. See the user interface section of the application’s documentation for description of the LED states or available UART commands.
The nRF Connect for Visual Studio Code extension is a complete IDE for developing applications for nRF91, nRF53 and nRF52 Series devices. It includes nRF Terminal, which is an integrated serial port and RTT terminal to connect to your board. For detailed instructions, see the nRF Connect for Visual Studio Code documentation site.
To see the UART output, connect to the development kit with a terminal emulator, for example, PuTTY.
Connect with the following settings:
Baud rate: 115200
8 data bits
1 stop bit
HW flow control: None
If you want to send commands through UART, make sure to configure the required line endings and turn on local echo and local line editing:
UART can also be used for logging purposes as one of the logging backends.
To view the logging output using Real Time Transfer (RTT), modify the configuration settings of the application to override the default UART console:
CONFIG_USE_SEGGER_RTT=y CONFIG_RTT_CONSOLE=y CONFIG_UART_CONSOLE=n
SEGGER’s J-Link RTT can also be used for logging purposes as one of the logging backends.
SEGGER’s J-Link RTT is part of the J-Link Software and Documentation Pack. You must have this software installed on your platform to use RTT.
To run RTT on your platform, complete the following steps:
From the J-Link installation directory, open the J-Link RTT Viewer application:
On Windows, the executable is called
On Linux, the executable is called
Select the following options to configure your connection:
Connection to J-Link: USB
Target Device: Select your IC from the list
Target Interface and Speed: SWD, 4000 KHz
RTT Control Block: Auto Detection
Click OK to view the logging output from the device.