Re: [myhdl-list] attribute enum_encoding: string;

[Angel E. <ang...@gm...>]

Chris,

I have not followed this in much detail so please excuse me if this is
obvious: Is this "enum" a MyHDL class? I ask because Python 3 will get
a builtin enum class. I think we should make sure that we make it
possible to use it if MyHDL is ever ported to Python 3.

Cheers,

Angel


On Thu, Sep 5, 2013 at 4:57 AM, Christopher Felton
<chr...@gm...> wrote:
> The following works without issue:
>
>      from myhdl import *
>
>      def m_think(clock,reset,thinking,sending,sent):
>
>          states = enum('IDLE', 'THINK', 'SEND_CMD', 'ADVANCE')
>          state = Signal(states.IDLE)
>
>          @always_seq(clock.posedge, reset=reset)
>          def rtl():
>              thinking.next = False
>              sending.next = False
>              if state == states.IDLE:
>                  state.next = states.THINK
>              elif state == states.THINK:
>                  thinking.next = True
>                  state.next = states.SEND_CMD
>              elif state == states.SEND_CMD:
>                  sending.next = True
>                  state.next = states.ADVANCE
>              elif state == states.ADVANCE:
>                  sent.next = sent+1
>                  state.next = states.IDLE
>              else:
>                  assert False, "Invalid states %s"%(state)
>
>          return rtl
>
>      def convert():
>          clock = Signal(bool(0))
>          reset = ResetSignal(0,active=0,async=True)
>          thinking = Signal(bool(0))
>          sending = Signal(bool(0))
>          sent = Signal(intbv(0,min=0,max=10e12))
>
>          toVHDL(m_think,clock,reset,thinking,sending,sent)
>
>      if __name__ == '__main__':
>          convert()
>
>     >> ghdl -a pck_myhdl_09.vhd m_think.vhd
>     >> ghdl -e m_think
>
> https://bitbucket.org/cfelton/examples/src/tip/state_machines/example1.py?at=default
>
> Note, I didn't test that the above example worked
> functionally.  I just put it together to demonstrate
> the "enum" type in VHDL is working.  In addition I am
> using a development snapshot but there hasn't been any
> changes in this area in the development, it is identical
> to the 0.8.
>
> Regards,
> Chris
>
> On 9/3/13 2:48 PM, David Holl wrote:
>> Hello, When using ghdl for syntax checks, I get the following error for
>> any state machine where encoding="one_hot":
>> pcie_drx.vhd:137:11: no declaration for "enum_encoding"
>>
>> I can resolve ghdl's complaints by adding
>> Â  attribute enum_encoding: string;
>> to the generated .vhd file.
>>
>> Is there a way to have this line included automatically in .vhd output?
>> Â I could add it via a shell script, but I'm wondering if there is
>> "better way" to do it. Â (or is GHDL in error?)
>>
>>
>> For example, here is an trimmed-down excerpt from the top of the .vhd
>> file showing where I add the line:
>>
>>     package pck_pcie_drx is
>>     Â  Â  attribute enum_encoding: string; Â <--- I need to add this line.
>>
>>     Â  Â  type t_enum_t_state_22 is (
>>
>>     Â  Â  IDLE,
>>
>>     Â  Â  THINK,
>>
>>     Â  Â  SEND_CMD,
>>
>>     Â  Â  ADVANCE
>>
>>     );
>>
>>     attribute enum_encoding of t_enum_t_state_22: type is "0001 0010
>>     0100 1000";
>>
>>     Â  Â  type t_enum_t_state_23 is (
>>     Â  Â  CMD,
>>     Â  Â  MWR_H0H1,
>>     Â  Â  MWR32_H2D0,
>>     Â  Â  MWR32_D1D2,
>>     Â  Â  MWR32_D3XX,
>>     Â  Â  MWR64_H2H3,
>>     Â  Â  MWR64_D0D1,
>>     Â  Â  DROP
>>     );
>>     attribute enum_encoding of t_enum_t_state_23: type is "00000001
>>     00000010 00000100 00001000 00010000 00100000 01000000 10000000";
>>     end package pck_pcie_drx;
>>     library IEEE;
>>     etc...
>>
>>
>>
>>
>> - David
>> Â  ps: Â Thank you for the fantastic MyHDL.
>>
>>
>>
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>
>
>
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