SEGGER Real Time Transfer

SEGGER's Real Time Transfer (RTT) is the proven technology for system monitoring and interactive user I/O in embedded applications. It combines the advantages of SWO and semihosting at very high performance.

For more information refer to

• RTT - SEGGER Knowledge Base
• RTT on segger.com

Usage

This package contains the RTT Target Sources. It can be used directly, either by including the Git Repository as a submodule, or by Download of the latest package, or as an CMSIS-Pack in CMSIS development tools.

General Usage and Configuration

To include RTT into a project, add RTT/SEGGER_RTT.c to the project sources and RTT as include directory.

RTT/SEGGER_RTT_ASM_ARMv7M.S is optional and can be added as additional source file for an assembly-optimized implementation of RTT functions. This file is compatible with ARMv7M and ARMv8M processors and most toolchains.

RTT can be configured through SEGGER_RTT_Conf.h. In most cases the default configuration is sufficient and SEGGER_RTT_Conf.h can be left untouched. In this case, Config can be added as include directory. If additional configuration is required, it is recommended to copy SEGGER_RTT_Conf.h to the project's configuration directory and make changes to the copy. That way, configuration does not get overwritten by an update of the package. In that case, do not add Config as include directory.

Additional Modules

The RTT Target Sources contain additional modules for printf-like output.

SEGGER_RTT_Printf.c provides a simple implementation of "printf" to write formatted strings directly via RTT.

Syscalls/SEGGER_RTT_Syscalls_*.c provides low-level retargeting functions for printf() to RTT with different toolchains.

Examples

The Examples dirctory includes some simple example and test applications to demonstrate RTT. Some examples can be run as bare-metal applications, some examples require additional modules, such as an RTOS.

• Main_RTT_InputEchoApp.c - Example application which echoes input on Channel 0.
• Main_RTT_MenuApp.c - Example application to demonstrate RTT bi-directional functionality.
• Main_RTT_PrintfTest.c - Example application to test RTT's simple printf implementation.
• Main_RTT_SpeedTestApp.c - Example application to measure RTT performance. (Requires embOS)

NOTE: The examples are not included in the CMSIS-Pack.

CMSIS-Pack

The CMSIS-Pack enables easy integration of RTT into CMSIS-based projects.

To use RTT in a csolution project add pack: SEGGER::RTT and component: SEGGER:RTT. The RTE directory is the project's config directory and contains the local copy of SEGGER_RTT_Conf.h for additional configuration.