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------------------------------------------------------------------------------
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-- This file is a part of the LPP VHDL IP LIBRARY
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-- Copyright (C) 2009 - 2010, Laboratory of Plasmas Physic - CNRS
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 2 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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----------------------------------------------------------------------------------
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-- Company:
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-- Engineer:
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--
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-- Create Date: 08:32:21 10/19/2010
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-- Design Name:
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-- Module Name: LCD_16x2_ENGINE - Behavioral
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-- Project Name:
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-- Target Devices:
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-- Tool versions:
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-- Description:
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--
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-- Dependencies:
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--
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-- Revision:
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-- Revision 0.01 - File Created
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-- Additional Comments:
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--
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----------------------------------------------------------------------------------
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library IEEE;
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use IEEE.STD_LOGIC_1164.ALL;
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use IEEE.NUMERIC_STD.ALL;
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library lpp;
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use lpp.amba_lcd_16x2_ctrlr.all;
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use lpp.LCD_16x2_CFG.all;
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entity LCD_16x2_ENGINE is
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generic(OSC_freqKHz : integer := 50000);
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Port ( clk : in STD_LOGIC;
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reset : in STD_LOGIC;
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DATA : in std_logic_vector(16*2*8-1 downto 0);
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CMD : in std_logic_vector(10 downto 0);
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Exec : in std_logic;
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Ready : out std_logic;
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LCD_CTRL : out LCD_DRVR_CTRL_BUSS
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);
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end LCD_16x2_ENGINE;
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architecture ar_LCD_16x2_ENGINE of LCD_16x2_ENGINE is
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constant ConfigTbl : LCD_CFG_Tbl :=(ClearDSPLY,FunctionSet,DSPL_CTRL,SetEntryMode,RetHome);
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signal SYNCH : LCD_DRVR_SYNCH_BUSS;
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signal DRIVER_CMD : LCD_DRVR_CMD_BUSS;
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signal FRAME_CLK : std_logic;
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signal FRAME_CLK_reg : std_logic;
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signal RefreshFlag : std_logic;
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signal CMD_Flag : std_logic;
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signal Exec_Reg : std_logic;
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type state_t is (INIT0,INIT1,INIT2,IDLE,Refresh,Refresh0,Refresh1,ReturnHome,GoLine2,GoLine2_0,ExecCMD0,ExecCMD1);
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signal state : state_t;
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signal i : integer range 0 to 32 := 0;
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begin
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Driver0 : LCD_16x2_DRIVER
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generic map(OSC_freqKHz)
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Port map(reset,clk,LCD_CTRL,SYNCH,DRIVER_CMD);
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FRAME_CLK_GEN0 : FRAME_CLK_GEN
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generic map(OSC_freqKHz)
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Port map( clk,reset,FRAME_CLK);
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process(reset,clk)
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begin
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if reset = '0' then
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state <= INIT0;
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Ready <= '0';
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RefreshFlag <= '0';
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i <= 0;
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elsif clk'event and clk ='1' then
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FRAME_CLK_reg <= FRAME_CLK;
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Exec_Reg <= Exec;
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if FRAME_CLK_reg = '0' and FRAME_CLK = '1' then
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RefreshFlag <= '1';
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elsif state = Refresh or state = Refresh0 or state = Refresh1 then
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RefreshFlag <= '0';
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end if;
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if Exec_Reg = '0' and Exec = '1' then
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CMD_Flag <= '1';
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elsif state = ExecCMD0 or state = ExecCMD1 then
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CMD_Flag <= '0';
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end if;
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case state is
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when INIT0 =>
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if SYNCH.DRVR_READY = '1' then
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DRIVER_CMD.Exec <= '1';
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DRIVER_CMD.Duration <= Duration_20ms;
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DRIVER_CMD.CMD_Data <= '0';
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DRIVER_CMD.Word <= ConfigTbl(i);
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i <= i + 1;
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state <= INIT1;
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else
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DRIVER_CMD.Exec <= '0';
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end if;
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when INIT1 =>
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state <= INIT2;
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DRIVER_CMD.Exec <= '0';
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when INIT2 =>
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if SYNCH.DRVR_READY = '1' then
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if i = 5 then
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state <= Idle;
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else
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state <= INIT0;
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end if;
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end if;
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when Idle=>
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DRIVER_CMD.Exec <= '0';
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if RefreshFlag = '1' then
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Ready <= '0';
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state <= Refresh;
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elsif CMD_Flag = '1' then
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Ready <= '0';
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state <= ExecCMD0;
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else
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Ready <= '1';
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end if;
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i <= 0;
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when Refresh=>
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if SYNCH.DRVR_READY = '1' then
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DRIVER_CMD.Exec <= '1';
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DRIVER_CMD.Duration <= Duration_100us;
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DRIVER_CMD.CMD_Data <= '1';
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DRIVER_CMD.Word <= DATA(i*8+7 downto i*8);
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i <= i + 1;
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state <= Refresh0;
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else
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DRIVER_CMD.Exec <= '0';
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end if;
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when Refresh0=>
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state <= Refresh1;
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DRIVER_CMD.Exec <= '0';
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when Refresh1=>
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if SYNCH.DRVR_READY = '1' then
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if i = 32 then
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state <= ReturnHome;
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elsif i = 16 then
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state <= GoLine2;
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else
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state <= Refresh;
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end if;
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end if;
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when ExecCMD0=>
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if SYNCH.DRVR_READY = '1' then
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DRIVER_CMD.Exec <= '1';
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DRIVER_CMD.Duration <= CMD(9 downto 8);
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DRIVER_CMD.CMD_Data <= '0';
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DRIVER_CMD.Word <= CMD(7 downto 0);
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state <= ExecCMD1;
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else
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DRIVER_CMD.Exec <= '0';
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end if;
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when ExecCMD1=>
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state <= Idle;
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DRIVER_CMD.Exec <= '0';
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when GoLine2=>
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if SYNCH.DRVR_READY = '1' then
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DRIVER_CMD.Exec <= '1';
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DRIVER_CMD.Duration <= Duration_100us;
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DRIVER_CMD.CMD_Data <= '0';
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DRIVER_CMD.Word <= X"C0";
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state <= GoLine2_0;
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else
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DRIVER_CMD.Exec <= '0';
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end if;
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when GoLine2_0=>
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state <= Refresh;
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DRIVER_CMD.Exec <= '0';
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when ReturnHome=>
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if SYNCH.DRVR_READY = '1' then
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DRIVER_CMD.Exec <= '1';
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DRIVER_CMD.Duration <= Duration_4ms;
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DRIVER_CMD.CMD_Data <= '0';
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DRIVER_CMD.Word <= X"02";
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state <= Idle;
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else
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DRIVER_CMD.Exec <= '0';
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end if;
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end case;
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end if;
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end process;
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end ar_LCD_16x2_ENGINE;
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