Creating a Random Point Generator in VHDL

[bb01919]

Hey, I am trying to create a Random Point generator with VHDL. I would like for points to generated randomly on the screen similar to the classic game Snake. Anybody have any ideas?

 

[rman1234]

Below is an example of a function to generate a random standard logic vector. You would need to put it in a loop to generate a string of random numbers. If the seed is the same, every time you call this function it will return the same std logic vector. This is the problem I had... If you can think of a more elegant way to use the code below I'd be interested.

  function random_std_logic_vector (vector_size : integer)
    return std_logic_vector is
    variable seed1, seed2: positive;
    variable rand: real;
    variable int_rand: integer;
    variable stim: std_logic_vector(vector_size-1 downto 0);    
  begin
--    loop 
    UNIFORM(seed1, seed2, rand);
    -- get a random value of size vector_size
    rand := rand * real(vector_size);
    int_rand := integer(floor(rand));
    -- 2. convert to std_logic_vector
    stim := std_logic_vector(to_unsigned(int_rand, stim'LENGTH));
    seed1 := integer(real(seed1) * rand);      
--    end loop;
    return stim;
  end;

EDIT: ensure that you add:
use ieee.math_real.all
for this to work.