I have just pushed a feature branch (andypugh/mesa_modbus) to the LinuxCNC github.
It uses the Mesa FPGA UARTs (specifically pktUART) to offer real-time modbus connection directly between a Mesa card and a Modbus device.
Docs are here:
github.com/LinuxCNC/linuxcnc/blob/andypu...ers/mesa_modbus.adoc
Please let me know of anything that you feel you need to know that the docs omit.
At the moment you will find mesa_modbus.c and the modcompile script in linuxcnc-dev/src/hal/drivers/mesa_hostmot2/modbus along with some sample configuration files.
Pin assignments and names are compiled-in rather than being determined at load time.
