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STM32MP1 support available in SW4STM32

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world.
And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4; you can download a short video showcasing this on the ac6-tools website (registration required).

System Workbench for STM32


You are viewing a reply to ModBus RTU with LWip  

ModBus RTU with LWip

France

Hi Dilanka,

Yes you can implement Modbus-RTU on the STM32F7 discovery board you have using the Max485; They both communicate using 3V signaling. The connections you will have to do is connecting RO to the Rx for USART6, DO to Tx of USART6 and both RE/ and DE to the same GPIO, choosing one available on the same Arduino connector, like PB4 (selected as TIM3_CH1 on the Arduino pinout, but you can change it to be a GPIO).

It is even possible that one of the Modbus master stacks available (like the one cited by JuliusCaesar) may support this chip or a compatible one. In all cases what you need is just a stack supporting the STM32 USARTs and using a GPIO to control the transceivers.

If you need to save as much power as possible, you will need to use two GPIOs to command RE/ and DE independently, disabling both the receiver and transmitter when the bus is inactive (this is possible as, being the master of the bus, you know when a slave can talk on the bus).

HTH

Bernard (Ac6)