This repository contains Ada software for the implementation of a library for ASCII and RTU MODBUS protocol stack, both client (master) and server (slave).
The software has two versions, polling and interrupt driven, based on the serial demos blocking and nonblocking inside the Ada Drivers Library from Adacore. The main board used for developing this software was the NUCLEO-F429ZI, from ST Microelectronics, that has connectors for Arduino shields, so you may connect any RS-485 Arduino shield on it. If you want to use other boards, do the Project Wizard that comes with the Ada Drivers Library choosing your board. You will need to change the hardware addresses of the peripherals.ads files inside the src/mbus/blocking or src/mbus/nonblocking folders to adapt to your board.
You may use the GNAT Programming Studio from Adacore or Visual Studio Code from Microsoft to cross-compile these sources. For VSCode, it has a .vscode/tasks.json file that permits to check syntax and semantic, compile, build, clean, convert elf to hex and bin files and flash hex and bin files to board. Both IDEs need the ST-LINK (version 1.6 or later) to flash the executable to the nucleo board, but the VSCode has the option to use STM32CubeProgrammer and flash elf files.