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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

custom component and system.h

Hi,

I have create some components for SoPC Builder and now I am working on the device drivers.

Some of my components serialize datas and I need to setup the output frequency.

This frequency is function of the avalon port clock frequency.

I see that for custom component, the avalon port clock frequency isn't reported in the system.h file !

For some components like the ALTERA_AVALON_UART, when I create the system library I can find the frequency of the avalon port input clock. 

#define <component_name>_FREQ            50000000

Someone know how to do that for custom components ?

Thanks for any help

Fabrice

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    13 years ago

    Hello,

    It's allready some time ago, but I found a solution for QSYS:

    In the xxx_hw.tcl: 

    #  #  parameters#  
add_parameter CLOCK_RATE POSITIVE 100000000 ""
set_parameter_property CLOCK_RATE DEFAULT_VALUE 100000000
set_parameter_property CLOCK_RATE DISPLAY_NAME CLOCK_RATE
set_parameter_property CLOCK_RATE WIDTH ""
set_parameter_property CLOCK_RATE TYPE POSITIVE
set_parameter_property CLOCK_RATE UNITS Hertz
set_parameter_property CLOCK_RATE DESCRIPTION ""
set_parameter_property CLOCK_RATE HDL_PARAMETER true
set_parameter_property CLOCK_RATE SYSTEM_INFO_TYPE CLOCK_RATE
set_parameter_property CLOCK_RATE SYSTEM_INFO_ARG clock
#  #  parameters for system.h#  set in ELABORATION_CALLBACK because only then, the parameters are set...#  
set_module_property ELABORATION_CALLBACK elaborate
proc elaborate {} {
    set_module_assignment embeddedsw.CMacro.FREQ u
}

    This gives the folowing line in system.h: 

    #define MODULE_NAME_FREQ 100000000u

    This solution is not realy documented somewhere. But it looks like 

    set_module_assignment embeddedsw.CMacro.XXX text

    defines 

    #define MODULE_NAME_XXX text

    For the clock frequenty, this can only be done in the elaborate callback because the clock is not known at loading time.

    Regards,

    Hannes