Re: how is it with gtkwave and tracing interfaces?

Marcel Hellwig <[email protected]> Sun, 31 Jan 2016 12:38:23 +0100
Newsgroups	gmane.comp.python.myhdl
Message-ID	<[email protected]>
Hmmm. When I open gtkwave and look at the i_dut instance, I can see 5
signals: ClkxC, DxD[7:0], DxE, QxD[7:0], ResetxRn

so.. i don't get your problem, sorry :/

Greetings
Marcel

On 31.01.2016 11:42, David Belohrad wrote:
> Dear All,
> 
> based on my previous question on how to do efficiently testbench I have made a small demo register, including a testbench to see the signals in the gtkwave (see below). It is a combination of Marcel's and Christopher's approaches. In addition I have added an interface having reset and clock signals.
> 
> The testbench how it is below works fine, and in GTKwave under i_dut I have all the signals, including a reset and clock, so ... satisfaction.
> 
> How, I want to pass the interface into the DUT, hence line
> 
> self.args = (self.rc.ClkxC, self.rc.ResetxRN, self.DxD, self.DxE, self.QxD)
> 
> becomes
> 
> self.args = (self.rc, self.DxD, self.DxE, self.QxD)
> 
> and register declaration:
> 
> def register(ClkxC, ResetxRN, DxD, DxE, QxD):
>     @always_seq(ClkxC.posedge, ResetxRN)
> 
> becomes
> 
> def register(rc, DxD, DxE, QxD):
>     @always_seq(rc.ClkxC.posedge, rc.ResetxRN)
> 
> 
> and now the mystery comes. I can run such testbench, and it runs again fine. Problem is, when looking on gtkwave signals, the interface signals are not there. Hence I cannot see ClkxC and I cannot see ResetxRN. I can somehow see the clock, as i_dut instantiates ClockList with register ClockList(0), which indeed contains the clock. ResetxRN however disappeared.
> 
> Why is that? And how can I avoid this?
> 
> thanks
> 
> .d.
> 
> 
> 
> --------------------------------------------------------------------------------
> # really disgusting way how to link relative
> import sys
> sys.path.append('/home/belohrad/git/didt/MyHDL/rhea')
> 
> from myhdl import *
> import unittest
> from functools import wraps
> from rhea.system.clock import *
> from rhea.system.reset import *
> 
> class RC(object):
>     def __init__(self):
>         self.ClkxC = Clock(0, frequency=160e6)
>         self.ResetxRN = Reset(0, active = 0, async=True)
> 
> 
> def register(ClkxC, ResetxRN, DxD, DxE, QxD):
>     @always_seq(ClkxC.posedge, ResetxRN)
>     def ilogic():
>         if DxE:
>             QxD.next = DxD
>     return ilogic,
> 
> _trace = False
> 
> # decorator to trace problematic function
> def trace(func):
>     func.trace = True
>     return func
> 
> #decorator with main bench initialization
> def myhdltest(func):
>     @wraps(func)
>     def wrapper(self):
> 
>         def testbench():
>             @instance
>             def clockGen():
>                 yield self.rc.ClkxC.gen()
> 
>             @instance
>             def reset():
>                 yield self.rc.ResetxRN.pulse( (10,12,18) )
> 
>             @instance
>             def stimulus():
>                 yield func(self)
>                 raise StopSimulation
> 
>             i_dut = self.dut(*self.args)
>             return i_dut, stimulus, reset, clockGen
> 
>         #tracedec = getattr(wrapper, 'trace', None)  # True or None
>         #tracesel = getattr(self, 'trace', None)  # True or None
>         #tracecmd = _trace  # True or False
>         #trace = (x for x in (tracedec, tracesel, tracecmd) if x is not None).next()
> 
>         g = traceSignals(testbench) #if trace else self.dut(*self.args)
>         Simulation(g).run()
> 
>     return wrapper
> 
> 
> class testRegister(unittest.TestCase):
> 
>     def setUp(self):
>         # prepare instance of the item
> 
>         self.DxD, self.QxD = [Signal(intbv(0)[8:]) for x in xrange(2)]
>         self.DxE = Signal(bool(0))
>         self.rc = RC()
> 
>         # test instance
>         self.args = (self.rc.ClkxC, self.rc.ResetxRN, self.DxD, self.DxE, self.QxD)
>         self.dut=register
> 
> 
> 
>     @trace
>     @myhdltest
>     def testRegister(self):
> 
>         # stimulus
>         self.rc.ClkxC.next = 0
>         self.DxD.next = 0
>         self.DxE.next = 1
>         yield join(self.rc.ClkxC.posedge, self.rc.ResetxRN.posedge)
> 
>         # reset stage finished
>         self.DxD.next = 1
>         for i in range(10):
>             yield (self.rc.ClkxC.posedge)
>             self.DxD.next = 0
>         yield(delay(150))
> 
> 
> 
> unittest.main()
> 
> ------------------------------------------------------------------------------
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