Modbus RTU library for uC

Cloning

git clone --recurse-submodules https://github.com/wdl83/modbus_c

Supported targets

1. ATmega328p, slave only
2. STM8S003F3, slave only
3. STM32F103C8, slave only
4. Linux, slave and master

All targets use same implementation

• state machine
• memory

Linux RTU

Utilizes linux tty device as serial I/O. Allows validation and quick prototyping.

make -f rtu_linux.mk

ATMega328p RTU

make -f rtu_atmega328p.mk

Testing

Current state of RTU tests

Building

make -f rtu_linux_tests.mk

Running

make -f rtu_linux_tests.mk run

Tests can be executed with different targets

1. default, software RTU (linux RTU running in separate thread)

./obj/rtu_linux_tests

1. HW loopback. Use 2 USB to SERIAL converters with crossed RX/TX pins

./obj/rtu_linux -d /dev/ttyUSB1 -a 32 -t 10000 -T 20000 -D 1024 -p E
./obj/rtu_linux_tests -d /dev/ttyUSB0 -a 32 -t 10000 -T 20000 -p E

1. HW target. ATmega328p with obj_atmega328p/rtu_atmega328p.hex connected to PC

./obj/rtu_linux_tests -d /dev/ttyUSB0 -a 15 -p E

Same set of tests work with all targets listed above.

Coverage report

report