Re: [myhdl-list] emulate always_seq decorator

[Jan D. <ja...@ja...>]

On 12/27/2013 09:01 AM, Marcel Hellwig wrote:
> Hi everyone,
>
> one of my devices is using yield a lot (state machine), but the
> decorators don't support generator functions.

The @instance decorator does. Why not simply use that?

Also, dynamic sensitivity lists are not supported in conversion.

Jan

  So I looked up in the
> source and wrote my own 'always_seq' decorator.
>
>> @instance
>>      def genFunction():
>>          #we emulate a @always_seq(clk.posedge)
>>          senslist = [clk.posedge]
>>
>>          if reset.async:
>>              if reset.active:
>>                  senslist.append(reset.posedge)
>>              else:
>>                  senslist.append(reset.negedge)
>>
>>          while True:
>>              yield senslist
>>
>>              if reset == reset.active:
>>                  presetSignals()
>>                  state.next = tState.FETCH
>>              else:
>>                  yield logic()
>
>
> the problem is, that toVHDL is now complaining about a lof ot things
>
>> myhdl.ConversionError: in file /home/marcel/studium/WISE1314/Projekt/hardware/cpu.py, line 254:
>>      Not supported: list
> this is the senslist = [clk.posedge] line. And also
>> myhdl.ConversionError: in file /home/marcel/studium/WISE1314/Projekt/hardware/cpu.py, line 266:
>>      Unsupported attribute: active
>
> (if reset == reset.active).
>
> How do I tell myhdl that he should translate this as usual?! Or tell me
> a different method to use yield inside a always_seq decorated function.
>
> Greetings,
> Marcel
>
>
>
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-- 
Jan Decaluwe - Resources bvba - http://www.jandecaluwe.com
     Python as a HDL: http://www.myhdl.org
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