Re: [myhdl-list] Constant ints in interfaces

[Josy B. <jos...@gm...>]

<snip>
> class Interface(object):
>      def __init__(self):
>          self.a = Signal(intbv(0, min=-1000, max=1000))
>          self.c = 10
> 
> where c gets converted as interface_name.c.
> 
> My understanding from the docs is that this should be supported, but I 
> might be missing something. I noticed this previously with IntEnum, 
but 
<snip>
Henry,

I noticed similar behaviour when using a class (as I also have local 
functions in the class), here is my code:
class CorrectionCoefficients(object):
    ''' a VHDL-record like object '''
    def __init__(self, WIDTH_PRNU, WIDTH_FPN, p = 0, f = 0):
        self.WIDTH_FPN = WIDTH_FPN
        self.WIDTH_PRNU = WIDTH_PRNU
        self.fpn = Signal(intbv(f)[WIDTH_FPN:])
        self.prnu = Signal(intbv(p)[WIDTH_PRNU:])


    def toCorrectionCoefficients(self, v):
        # need an unique name as 'alias' otherwise the 'self.WIDTH_FPN' 
shows up as a constant in the VHDL
        tccWIDTH_FPN = self.WIDTH_FPN
        @always_comb
        def tcc():
            lv = v
            self.fpn.next = lv[tccWIDTH_FPN:]
            self.prnu.next = lv[:tccWIDTH_FPN]

        return tcc

    def tointbv(self, y):
        ''' build a flattened vector from the record's elements in 
ascending order'''
        # need an unique name as 'alias' otherwise the 'self.WIDTH_FPN' 
shows up as a constant in the VHDL :)
        tiWIDTH_FPN = self.WIDTH_FPN

        @always_comb
        def ti():
            y.next[tiWIDTH_FPN:] = self.fpn
            y.next[:tiWIDTH_FPN] = self.prnu

        return ti
 

Regards,

Josy