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

[Christopher F. <chr...@gm...>]

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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