Hallo Tristan,
Am 28.10.2015 um 20:59 schrieb Tristan Gingold:
> On 28/10/15 19:45, René Doß wrote:
>> Hallo,
>>
>> a record in the VHDL code and a struct in the C code.
>> I think inout is not nesesary. Both out parameter can be combined.
>>
>> record <-----return struct
>>
>>
>> This can work. Now is the question, how is the correct syntax?
>
> Yes, that's the best option: use a record and pass it as an inout
> parameter.
> Such a record is passed by reference, so you just have to declare the
> corresponding C struct.
>
> Tristan.
>
Ok you mean inout.
This is for me totally new. I used only in or out and only type int.
first what I need is like this in VHDL
record
value: std_logic_vector (31 downto 0); --
value
valid :
std_logic;
-- flag new valid value
ack:
std_logic; --
feedback value accepted
end record;
But I am unknowing how to handle std_logic in VHPI. I only use type
integer. For this I make cast.
the C struct I would wirte like this.
struct vhpi_struct {
int value;
int valid;
int ack;
}
I can not write the corresponding record <-> c struct. This my first
handicap.
René
>>
>>
>> René
>>
>>
>>
>> Am 27.10.2015 um 23:32 schrieb [email protected]:
>>> Le 2015-10-27 23:32, René Doß a écrit :
>>>> Hallo,
>>>>
>>>> I write on a cosimulation with the vhpi interface to C.
>>>>
>>>> Now I need a vhdl procedure that get from the C code some datas and
>>>> also
>>>> a flag.
>>>>
>>>> [vhdl]
>>>>
>>>> procedure vhpi_emu ( value: out integer; value_valid: out integer;
>>>> solved_back: in integer);
>>>>
>>>> attribute foreign of vhpi_emu :
>>>> procedure is "VHPIDIRECT vhpi_emu";
>>>>
>>>> [\vhdl]
>>>>
>>>>
>>>> How looks the c code for this procedure?
>>>> In C I have only return with one value.
>>>>
>>>>
>>>> How can connect a C function to this VHDL procedure?
>>>
>>> From my dim memories, VHDL should send a sort of record as inout,
>>> because VHDL must allocate itself the memory on its stack for the
>>> return data.
>>> Otherwise it's a huge can of worms (and you have had a taste already).
>>>
>>> I don't know the exact syntax however but my idea is :
>>> make a "out_record", send it to the C function
>>> which should receive it as a pointer to this record.
>>> that's a first thing to check ;-)
>>> C reads and writes it, then returns...
>>> C should not allocate memory (that is shared with GHDL),
>>> or in an extremely precise manner and for certain purposes.
>>>
>>> good luck,
>>> yg
>>>
>>> _______________________________________________
>>> Ghdl-discuss mailing list
>>> [email protected]
>>> https://mail.gna.org/listinfo/ghdl-discuss
>>
>>
>> _______________________________________________
>> Ghdl-discuss mailing list
>> [email protected]
>> https://mail.gna.org/listinfo/ghdl-discuss
>>
>
>
> _______________________________________________
> Ghdl-discuss mailing list
> [email protected]
> https://mail.gna.org/listinfo/ghdl-discuss
_______________________________________________
Ghdl-discuss mailing list
[email protected]
https://mail.gna.org/listinfo/ghdl-discuss
