Modbus RTU Master and Slave library for STM32 microcontrollers based on Cube HAL and FreeRTOS. This is a port of the Modbus library for Arduino: https://github.com/smarmengol/Modbus-Master-Slave-for-Arduino

• Portable to any STM32 MCU supported by ST Cube HAL.
• Multithread-safe implementation based on FreeRTOS.
• Multiple instances of Modbus (Master and/or Slave) can run concurrently in the same MCU, only limited by the number of available UART/USART of the MCU.
• RS485 compatible.

├── LICENSE
├── README.md
├── ModbusF103 --> NUCLEO64-F103 Modbus Master and Slave example
├── ModbusF429 --> NUCLEO144-F429 Modbus Slave example
├── MODBUS-LIB --> Library Folder
    ├── Inc
    │   └── Modbus.h 
    └── Src
        ├── Modbus.c 
        └── UARTCallback.c 

Examples provided for STM32CubeIDE Version: 1.3.0 https://www.st.com/en/development-tools/stm32cubeide.html.

• Import the examples in the STM32CubeIDE from the system folder
• Connect your NUCLEO board
• Compile and start your debugging session!
• If you need to adjust the Baud rate or any other parameter use the Cube assistant (recommended). If you change the USART you need to enable the interrupts for the selected USART. Check UARTCallback.c for more details.
• For the ModbusF103 example, you can use external USB-to-serial adapters or connect the Master and Slave instances in a loopback (USART1 <--> USART3).
• The ModbusF429 example uses the ST-Link serial port. To test this example you don't need an external USB-to-serial adapter.

Linux: https://launchpad.net/~js-reynaud/+archive/ubuntu/qmodbus

Windows: https://sourceforge.net/projects/qmodbus/

Linux: https://sourceforge.net/projects/pymodslave/

Windows: https://sourceforge.net/projects/modrssim2/

• Implement wrapper functions for Master function codes. Currently, telegrams are defined manually.
• Improve function documentation
• Test with Rs485 transceivers (implemented but not tested)
• MODBUS TCP implementation