rtlabs-com/m-bus

Modbus TCP and RTU stack for embedded devices

Modbus stack

This repository contains a Modbus stack. The stack is written to an OS abstraction layer and can also be used in a bare metal application. Using the abstraction layer, the stack can run on Linux, Windows or on an RTOS.

Cloning

Clone the source:

$ git clone --recurse-submodules https://github.com/rtlabs-com/m-bus.git

This will clone the repository with submodules. If you already cloned the repository without the --recurse-submodules flag then run this in the m-bus folder:

$ git submodule update --init --recursive

Prerequisites for all platforms

• CMake 3.14 or later

Windows

• Visual Studio 2019 or later

You can use a windows or unix shell as preferred. The following instructions are for a unix shell. CMake is assumed to be in your path.

$ cmake -B build.win64 -A x64
$ cmake --build build.win64 --config Release
$ cmake --build build.win64 --config Release --target check

This builds the project and runs the unit tests.

Linux

• GCC 4.6 or later

$ cmake -B build
$ cmake --build build --target all check

This builds the project and runs the unit tests.

rt-kernel

• Workbench 2020.1 or later

You should use a bash shell, such as for instance the Command Line in your Toolbox installation. Set the BSP variable to the name of the BSP you wish to build for. Set the RTK variable to the path of your rt-kernel tree.

Standalone project

This creates standalone makefiles.

$ RTK=/path/to/rt-kernel BSP=xmc48relax cmake \
   -B build.xmc48relax \
   -DCMAKE_TOOLCHAIN_FILE=cmake/tools/toolchain/rt-kernel.cmake \
   -G "Unix Makefiles"
$ cmake --build build.xmc48relax

Workbench project

This creates a Makefile project that can be imported to Workbench. The project will be created in the build directory. The build directory should be located outside of the source tree.

$ RTK=/path/to/rt-kernel BSP=xmc48relax cmake \
   -B build.xmc48relax -S /path/to/m-bus \
   -DCMAKE_TOOLCHAIN_FILE=cmake/tools/toolchain/rt-kernel.cmake \
   -DCMAKE_ECLIPSE_EXECUTABLE=/opt/rt-tools/workbench/Workbench \
   -DCMAKE_ECLIPSE_GENERATE_SOURCE_PROJECT=TRUE \
   -G "Eclipse CDT4 - Unix Makefiles"

A source project will also be created in the m-bus tree. This project can also be imported to Workbench. After importing, right-click on the project and choose New -> Convert to a C/C++ project. This will setup the project so that the indexer works correctly and the Workbench revision control tools can be used.

The library and the unit tests will be built. Note that the tests require a stack of at least 6 kB. You may have to increase CFG_MAIN_STACK_SIZE in your bsp include/config.h file.

Contributions

Contributions are welcome. If you want to contribute you will need to sign a Contributor License Agreement and send it to us either by e-mail or by physical mail. More information is available here.