Re: [myhdl-list] always_comb exception

[Norbo <Nor...@gm...>]

Am 09.10.2013, 20:16 Uhr, schrieb Per Karlsson <bas...@gm...>:

> I suspect you are running from the interpreter.
> That won't work, because MyHDL uses inspection.
> Every piece of MyHDL code has to be written to an actual file somewhere  
> (or
> at least that's how I understand it).
>
> Cheers
> Per
>
>
> On Wed, Oct 9, 2013 at 7:48 PM, Steve Vejcik  
> <ste...@ea...>wrote:
>
>> Hi Folks - I'm just wetting my feet with myhdl and have run into a  
>> problem
>> running the simple latch example from the wiki. I'm running python 2.7  
>> with
>> myhdl v0.8. If anyone can offer some insight I'd appreciate it. Here's a
>> variant of the problem:
>>
>> def Mux(z, a, b, sel):
>>    @always_comb
>>    def muxLogic():
>>      if sel == 1:
>>        z.next = a
>>      else:
>>        z.next = b
>>    return muxLogic
>> >>> z, a, b, sel = [Signal(0) for i in range(4)]
>> >>> mux_1 = Mux(z,a,b,sel)
>>
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "<stdin>", line 2, in Mux
>>   File "/usr/local/lib/python2.7/dist-packages/myhdl/_always_comb.py",  
>> line
>> 64, in always_comb
>>     c = _AlwaysComb(func, symdict)
>>   File "/usr/local/lib/python2.7/dist-packages/myhdl/_always_comb.py",  
>> line
>> 185, in __init__
>>     s = inspect.getsource(func)
>>   File "/usr/lib/python2.7/inspect.py", line 701, in getsource
>>     lines, lnum = getsourcelines(object)
>>   File "/usr/lib/python2.7/inspect.py", line 690, in getsourcelines
>>     lines, lnum = findsource(object)
>>   File "/usr/lib/python2.7/inspect.py", line 538, in findsource
>>     raise IOError('could not get source code')
>> IOError: could not get source code
>>
>> Steve


Yes,a file is needed, you could also write it into a file for the  
interpreter,
then it should definitly work.
for example like this:


 from myhdl import *

source_text="""def Mux(z, a, b, sel):
    @always_comb
    def muxLogic():
      if sel == 1:
        z.next = a
      else:
        z.next = b
    return muxLogic
z, a, b, sel = [Signal(0) for i in range(4)]
mux_1 = Mux(z,a,b,sel)"""

source_file=open("sourcetext.txt","w")
source_file.write(source_text)
source_file.close()
dd=compile(source_text,"sourcetext.txt","exec")
exec(dd)


greetings
Norbo