Rtt Communication - Segger J-Link User Manual

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13.3 RTT Communication

Communication with the RTT implementation on the target can be done with different
applications. The functionality can even be integrated into custom applications using
the J-Link SDK.
Using RTT in the target application is made easy. The implementation code is freely
available for download and can be integrated into any existing application. To com-
municate via RTT any J-Link can be used.
The simple way to communicate via the Terminal (Channel 0) is to create a connec-
tion to localhost:19021 with a Telnet client or similar, when a connection to J-Link
(e.g. via a debug session) is active.
The J-Link Software Package comes with some more advanced applications, which
demonstrates RTT functionality for different purposes.
13.3.1 RTT Viewer
The J-Link RTT Viewer is described in
13.3.2 RTT Client
J-Link RTT Client acts as a Telnet client, but automatically tries to reconnect to a J-
Link connection when a debug session is closed.
The J-Link RTT Client is part of the J-Link Software and Documentation Pack for Win-
dows, Linux and OS X and can be used for simple RTT use cases.
13.3.3 RTT Logger
With J-Link RTT Logger, data from Up-Channel 1 can be read and logged to a file. This
channel can for example be used to send performance analysis data to the host.
J-Link RTT Logger opens a dedicated connection to J-Link and can be used stand-
alone, without running a debugger.
The application is part of the J-Link Software and Documentation Pack for Windows,
Linux and OS X.
The source of J-Link RTT Logger can be used as a starting point to integrate RTT in
other PC applications, like debuggers, and is part of the J-Link SDK.
13.3.4 RTT in other host applications
RTT can also be integrated in any other PC application like a debugger or a data visu-
alizer in either of two ways.
1. The application can establish a socket connection to the RTT Telnet Server which
is opened on localhost:19021 when a J-Link connection is active.
2. The application creates its own connection to J-Link and uses the J-Link RTT API
which is part of the J-Link SDK to directly configure and use RTT.
J-Link / J-Trace (UM08001)
CHAPTER 13
J-Link RTT Viewer
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RTT