Re: [myhdl-list] attribute enum_encoding: string;
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Re: [myhdl-list] attribute enum_encoding: string;
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From: Christopher F. <chr...@gm...> - 2013-09-05 11:03:36
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On 9/4/13 11:26 PM, David Holl wrote:
> Thank you for looking into it Chris. Â I confirm that the example code
> you sent works correctly with ghdl.
>
> But it still triggers the "no declaration" error in ghdl when I
> specify encoding='one_hot' for states:
>
> tensor(pts/0):~/m_think> diff old/m_think.py new/m_think.py
> 5c5
> < Â Â states = enum('IDLE', 'THINK', 'SEND_CMD', 'ADVANCE')
> ---
> > Â Â states = enum('IDLE', 'THINK', 'SEND_CMD', 'ADVANCE',
> encoding='one_hot')
>
Sorry for the confusion, yes I forgot to add the "encoding='one_hot'".
I have updated the example, for me I don't get the error, here
is a snip of the converted code
type t_enum_states_1 is (
IDLE,
THINK,
SEND_CMD,
ADVANCE
);
attribute enum_encoding of t_enum_states_1: type is "0001 0010 0100
1000";
>> ghdl -a pck_myhdl_09.vhd m_think.vhd
>> ghdl -e m_think
>> ghdl -r m_think
The version of GHDL I am using:
ghdl -v
GHDL 0.29 (20100109) [Sokcho edition]
Compiled with GNAT Version: 4.4.0 20080314 (experimental)
mcode code generator
Written by Tristan Gingold
I update the exampe:
https://bitbucket.org/cfelton/examples/src/tip/state_machines/example1.py
Regards,
Chris
>
> tensor(pts/0):~/m_think> python m_think.pyÂ
> ** ToVHDLWarning: Output port is read internally: sent
> tensor(pts/0):~/m_think> ghdl -a pck_myhdl_08.vhd m_think.vhd   Â
> Â Â Â Â Â Â Â Â Â
> m_think.vhd:15:11: no declaration for "enum_encoding"
> /usr/lib/ghdl/bin/ghdl: compilation error
> tensor(pts/0):~/m_think> echo $?
> 1
>
> I've attached the modify python code and generated vhdl.
>
> Thank you,
> David
>
>
> On Wed, Sep 4, 2013 at 10:57 PM, Christopher Felton
> <chr...@gm... <mailto:chr...@gm...>> wrote:
>
> The following works without issue:
>
> Â Â Â from myhdl import *
>
> Â Â Â def m_think(clock,reset,thinking,sending,sent):
>
> Â Â Â Â Â states = enum('IDLE', 'THINK', 'SEND_CMD', 'ADVANCE')
> Â Â Â Â Â state = Signal(states.IDLE)
>
> Â Â Â Â Â @always_seq(clock.posedge, reset=reset)
> Â Â Â Â Â def rtl():
> Â Â Â Â Â Â Â thinking.next = False
> Â Â Â Â Â Â Â sending.next = False
> Â Â Â Â Â Â Â if state == states.IDLE:
> Â Â Â Â Â Â Â Â Â state.next = states.THINK
> Â Â Â Â Â Â Â elif state == states.THINK:
> Â Â Â Â Â Â Â Â Â thinking.next = True
> Â Â Â Â Â Â Â Â Â state.next = states.SEND_CMD
> Â Â Â Â Â Â Â elif state == states.SEND_CMD:
> Â Â Â Â Â Â Â Â Â sending.next = True
> Â Â Â Â Â Â Â Â Â state.next = states.ADVANCE
> Â Â Â Â Â Â Â elif state == states.ADVANCE:
> Â Â Â Â Â Â Â Â Â sent.next = sent+1
> Â Â Â Â Â Â Â Â Â state.next = states.IDLE
> Â Â Â Â Â Â Â else:
> Â Â Â Â Â Â Â Â Â assert False, "Invalid states %s"%(state)
>
> Â Â Â Â Â return rtl
>
> Â Â Â def convert():
> Â Â Â Â Â clock = Signal(bool(0))
> Â Â Â Â Â reset = ResetSignal(0,active=0,async=True)
> Â Â Â Â Â thinking = Signal(bool(0))
> Â Â Â Â Â sending = Signal(bool(0))
> Â Â Â Â Â sent = Signal(intbv(0,min=0,max=10e12))
>
> Â Â Â Â Â toVHDL(m_think,clock,reset,thinking,sending,sent)
>
> Â Â Â if __name__ == '__main__':
> Â Â Â Â Â convert()
>
> Â Â >> ghdl -a pck_myhdl_09.vhd m_think.vhd
> Â Â >> 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. Â I just put it together to demonstrate
> the "enum" type in VHDL is working. Â 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:
> >
> > Â Â 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
> >
> > Â Â );
> >
> > Â Â attribute enum_encoding of t_enum_t_state_22: type is "0001
> 0010
> > Â Â 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
> > Â Â );
> > Â Â attribute enum_encoding of t_enum_t_state_23: type is "00000001
> > Â Â 00000010 00000100 00001000 00010000 00100000 01000000
> 10000000";
> > Â Â end package pck_pcie_drx;
> > Â Â library IEEE;
> > Â Â etc...
> >
> >
> >
> >
> > - David
> > Â  ps: Â Thank you for the fantastic MyHDL.
> >
> >
> >
> >
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>
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