Re: [myhdl-list] difficulty using itertools with MyHDL

[George P. <ge...@ga...>]

>> So at this point I would look for a workaround and convert
>> iterator objects to the "officially" supported types
>> (for behavior or structure) as desired. The advantage is
>> of course that no change to MyHDL would be required.
>>
>> A workaround for your case could be the following. Just use
>> itertools to set up your iterator as desired. Then convert
>> it to a generator using a one-liner generator expression, e.g.:
>>
>> ordered_tests = (t for t in chain(stage1, stage2, stopsim()))
>>
>> This should work for any iterator you can imagine.
>>
>>     
Hi Jan, I like your solution, but I've hit a snag and I'm not sure why 
I'm getting the error message below. Could you perhaps enlighten me? ;-)

I've pasted a stripped-down example below:

Thanks,
George


$ python -i test__ascii_timing_spec.py
 >>> eggs()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "test__ascii_timing_spec.py", line 92, in eggs
    sim.run()
  File "/usr/lib/python2.4/site-packages/myhdl/_Simulation.py", line 
132, in run

    waiter.next(waiters, actives, exc)
  File "/usr/lib/python2.4/site-packages/myhdl/_Waiter.py", line 128, in 
next
    schedule((_simulator._time + clause._time, self))
AttributeError: 'tuple' object has no attribute '_time'
 >>>

# 
---------------------------------------------------------------------------

from myhdl import Signal, delay, Simulation, instance, instances

def eggs():
   
    def bench(sigs, cts):
       
        def driver(sigs):
           
            clk = sigs['clk']
           
            for i in range(10):
                yield delay(1)
                clk.next = not clk
       
        def monitor(sigs, cts):
           
            clk = sigs['clk']
           
            i = 0
            while True:
               
                yield delay(1)
                print "clk = " + str(clk)
           
                i += 1
                 
        import itertools
       
        # Execute the driver and monitor together
        combo = (t for t in itertools.izip(driver(sigs), monitor(sigs, 
cts)))
       
        return combo


    sigs = dict(clk=Signal(bool(0)))
    ref_cts = dict(clk = [1, 0, 1, 0, 1, 0, 1, 1,
                          0, 0, 1, 1, 0, 0, 1, 1,
                          1, 1, 0, 0, 0, 0, 1, 1,
                          1, 1, 0, 0, 0, 0, 1, 1,
                          1, 1, 0, 0, 0, 0, 1, 1])

    sim = Simulation(bench(sigs, ref_cts))
    sim.run()   

# 
---------------------------------------------------------------------------