The float formatting support is not enabled, check your MCU Settings from 'Project Properties > C/C++ Build > Settings > Tool Settings', or add manually '-u _printf_float' in linker flags. If the following problems happen during compiling by STM32CubeIDE, go to 'Project > Properties > C/C++ Build > Settings > Tool Settings > MCU Settings'Īnd then check the box 'Use float with printf from newlib-nano (-u _printf_float).' 1. The key files of the library used in this project is put in the library.On-line CRC calculation and free library.The CRC 16 calculation function is available from Lammert Bies.Turn on USART3, Mode: Asynchronous, Basic parameters: 115200 8N1.Turn on USART2, Mode: Asynchronous, Basic parameters: 115200 8N1.Turn on USART1, Mode: Asynchronous, Basic parameters: 9600 8N1.UART3: A HMI with the UART interface is used to show the device responses through the UART3.UART1: A 'RS-485 to TTL module' is used to convert the RS-485 signal because STM32 NUCLEO-F446RE (and Blue Pill) does not support RS-485 directly.Users can monitor the device responses from the STM32CubeIDE console monitor (or other serial monitor) via UART2.Send the device responses to the human-machine interface (HMI) via the UART3.Get responses from the device through RS-485.Send Modbus-RTU command to the device through RS-485 via the UART1.The test board is used to simulate the device for testing the functionalities of the main board. The main board is the major developing object in this project, providing all required functionalities. There are two boards used in this project, i.e., the main and test boards. The device responses are resolved by the STM32 NUCLEO-F446RE with cyclic redundancy check (CRC) and outputted to the human-machine interface (HMI).

The STM32 NUCLEO-F446RE board is used to communicate with the external device through RS-485 Modbus-RTU.

RS-485 Modbus-RTU Call Response and HMI Display with CRC for STM32 About the project

Modbus rtu crc