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--! @file sm.vhd

--! @brief Maquina de Estados. Controla la operación interna y genera los mecanismos de sincronización con el exterior (interrupciones). 

--! @author Julián Andrés Guarín Reyes

--------------------------------------------------------------

-- RAYTRAC

-- Author Julian Andres Guarin

-- sm.vhd

-- This file is part of raytrac.

-- 

--     raytrac is free software: you can redistribute it and/or modify

--     it under the terms of the GNU General Public License as published by

--     the Free Software Foundation, either version 3 of the License, or

--     (at your option) any later version.

-- 

--     raytrac is distributed in the hope that it will be useful,

--     but WITHOUT ANY WARRANTY; without even the implied warranty of

--     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

--     GNU General Public License for more details.

-- 

--     You should have received a copy of the GNU General Public License

--     along with raytrac.  If not, see <http://www.gnu.org/licenses/>.

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

entity customCounter is

        generic (

                width : integer := 9;

        )

        port (

                clk,rst,go,set : in std_logic;

                setValue : in std_logic_vector(width - 1 downto 0);

                count : out std_logic_vector (width - 1 downto 0)

        );

end entity;

architecture customCounter_arch of customCounter is

        constant rstMasterValue : std_logic := '0';

        signal scount_d, scount_q : std_logic_vector(width-1 downto 0);

begin

        count <= scount_d;

        add_proc:

        process (scount_q,go,set,setValue)

        begin

                case set is

                        when '1'  => scount_d <= setValue;

                        when others => scount_d <= scount_q+go;

                end case;

        end process;

        count_proc:

        process (clk,rst)

        begin

                if rst=rstMasterValue then

                        scount_q <= (others => '0');

                elsif clk='1' and clk'event then

                        scount_q <= scount_d;

                end if;

        end process;

end architecture;