I've created a record in VHDL
type direction is record
left : std_logic;
right : std_logic;
end record direction;
And I have function that should return this record with assigned values to left and right of either 0 or 1.
That part of function looks like this:
begin
if (x = 0) then
direction.left <= '0';
else
direction.left <= '1';
end if;
....
return direction;
end;
but I keep getting error that it cannot be used as a prefix in a selected name. I've never worked with a record inside a function, so I feel like I'm doing something wrong while accessing the elements of record.
Thank you for any help!
What you have defined is a type
A type is a descriptor to an item, usually a signal or a variable.
Common types in VHDL are std_logic, std_logic_vector, integer, etc... and you have the right to create your own type. The type direction you describe is OK.
To use it, you have to declare in your function a variable defined with this very type :
variable my_direction : direction;
Then you can use the variable my_direction in your function.
type direction is record
left : std_logic;
right : std_logic;
end record direction;
function my_func (x...) return direction is
variable my_direction : direction;
begin
if (x = 0) then
my_direction.left := '0';
else
my_direction.left := '1';
end if;
....
return my_direction;
end;