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-- Company:             University of Southern Denmark

-- Engineer:            Simon Falsig

-- 

-- Create Date:         19/03/2010 

-- Design Name:         uTosNet_spi Example

-- Module Name:         top - Behavioral 

-- File Name:           top.vhd

-- Project Name:        uTosNet

-- Target Devices:      SDU XC3S50AN Board

-- Tool versions:       Xilinx ISE 11.4

-- Description:         This is a simple example showing the use of the uTosNet_spi

--                                      module.

--

-- Revision: 

-- Revision 0.10 -      Initial release

--

-- Copyright 2010

--

-- This file is part of the uTosNet_spi Example

--

-- The uTosNet_spi Example is free software: you can redistribute it 

-- and/or modify it under the terms of the GNU Lesser General Public License as

-- published by the Free Software Foundation, either version 3 of the License,

-- or (at your option) any later version.

--

-- The uTosNet_spi Example 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 Lesser

-- General Public License for more details.

--

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

-- along with the uTosNet_spi Example. If not, see

-- <http://www.gnu.org/licenses/>.

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

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating

---- any Xilinx primitives in this code.

--library UNISIM;

--use UNISIM.VComponents.all;

entity top is

Port (  CLK_50M_I                       : in    STD_LOGIC;

                LEDS_O                          : out   STD_LOGIC_VECTOR(2 downto 0);

                SPI_MISO_O                      : out   STD_LOGIC;

                SPI_MOSI_I                      : in    STD_LOGIC;

                SPI_EN_I                        : in    STD_LOGIC;

                SPI_CLK_I                       : in    STD_LOGIC);

end top;

architecture Behavioral of top is

        component uTosNet_spi is

        Port (  clk_50M                                         : in    STD_LOGIC;

                        spi_miso                                        : out   STD_LOGIC;

                        spi_mosi                                        : in    STD_LOGIC;

                        spi_clk                                         : in    STD_LOGIC;

                        spi_en                                          : in    STD_LOGIC;

                        dataReg_addr                            : in    STD_LOGIC_VECTOR(5 downto 0);

                        dataReg_dataIn                          : in    STD_LOGIC_VECTOR(31 downto 0);

                        dataReg_dataOut                         : out   STD_LOGIC_VECTOR(31 downto 0);

                        dataReg_clk                                     : in    STD_LOGIC;

                        dataReg_writeEnable                     : in    STD_LOGIC);

        end component;

        type STATES is (IDLE, SETUP, CLK, DONE);

        signal state            : STATES := IDLE;

        signal nextState        : STATES := IDLE;

        signal dataReg_addr             : STD_LOGIC_VECTOR(5 downto 0);

        signal dataReg_dataIn   : STD_LOGIC_VECTOR(31 downto 0);

        signal dataReg_dataOut  : STD_LOGIC_VECTOR(31 downto 0);

        signal dataReg_clk              : STD_LOGIC;

        signal dataReg_we               : STD_LOGIC;

begin

        uTosNet_spiInst : uTosNet_spi

        Port map (      clk_50M => CLK_50M_I,

                                spi_miso => SPI_MISO_O,

                                spi_mosi => SPI_MOSI_I,

                                spi_en => SPI_EN_I,

                                spi_clk => SPI_CLK_I,

                                dataReg_addr => dataReg_addr,

                                dataReg_dataIn => dataReg_dataIn,

                                dataReg_dataOut => dataReg_dataOut,

                                dataReg_clk => dataReg_clk,

                                dataReg_writeEnable => dataReg_we);

        process(CLK_50M_I)

        begin

                if(CLK_50M_I = '1' and CLK_50M_I'event) then

                        state <= nextState;

                        case state is

                                when IDLE =>

                                when SETUP =>

                                        dataReg_addr <= "000000";

                                        dataReg_clk <= '0';

                                        dataReg_we <= '0';

                                when CLK =>

                                        dataReg_clk <= '1';

                                when DONE =>

                                        LEDS_O <= dataReg_dataOut(2 downto 0);

                        end case;

                end if;

        end process;

        process(state)

        begin

                case state is

                        when IDLE =>

                                nextState <= SETUP;

                        when SETUP =>

                                nextState <= CLK;

                        when CLK =>

                                nextState <= DONE;

                        when DONE =>

                                nextState <= IDLE;

                end case;

        end process;

end Behavioral;