how to export macro to system.h?

There are a couple of good documents on all of this..

http://www.altera.com/literature/hb/qts/qts_qii54022.pdf

http://www.altera.com/literature/hb/nios2/n2sw_nii52018.pdf

We use the validation phase for the main clock frequency that feeds a SOPC module as it is usually derived and you don't really want them editable in the gui..

But I guess it's much the same depending on how you write the proc callback....

******* The following is in the ___hw.tcl file for the component **

set_module_property VALIDATION_CALLBACK validate

add_parameter clock_freq INTEGER

set_parameter_property clock_freq SYSTEM_INFO {CLOCK_RATE "clock"}

proc validate {} {

set_module_assignment embeddedsw.CMacro.FREQ [get_parameter_value clock_freq]

}

****

This will add a C Macro to the system.h file like this# define "SOPC_MODULE_NAME"_FREQ 1000000

the "clock" above is the endpoint you defined somewhere else in you tcl file.