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Enable Modbus communication and Flash writing

Hi all,

I have a nice application that boots from Flash and works fine (almost..) I would really like to make it configurable via a GUI running on a normal PC.

As first thing I would like to write a simple example that allows me to write a number to flash via MODBUS then read this number and react accordingly (toggling a pin).

I am pretty sure I can handle the GUI part (I wrote one that uses an RS232 port, I have an RS232 to RS485 converter) but I have no idea where to start for the DSP side nor I understand how MODBUS addresses are related to DSP variables.

Is there anyone out there who has done something similar and has some example available to point me for a start?

 

Thank you very much for your precious time,

      Andrea