/*********************************************************************************

 * Company                    :

 * Engineer                    : 空气微凉

 *

 * Create Date                : 00:00:00 22/03/2013

 * Design Name                :

 * Module Name                :

 * Project Name                :

 * Target Devices            :

 * Tool versions                :

 * Description                :

 *                                   http://www.cnblogs.com/kongqiweiliang/

 * Dependencies                :

 *                                Avalon_MM_Slave_IP

 * Revision                    :

 * Revision                    : 0.01 - File Created

 * Additional Comments        :

 ********************************************************************************/

 `timescale 1ns/1ps

 `define    UD  #

 /*******************************************************************************/

 module Avalon_MM_Slave_LCD1602

 (

     //clock input

     input                                         icsi_clk            ,//

     input                                         ireset_n             ,//

     //Avalon_MM_Slave interface

     input                                         iavs_chipselect        ,//片选信号

     input                            [ :]         iavs_address        ,//地址,译码后确定寄存器offset

     input                                         iavs_write            ,//写使能信号

     input                            [:]         iavs_writedata        ,//32位写数据值

     //input                                         iavs_read            ,//读时能信号

     //input                            [31:0]         iavs_readdata        ,//32位读数据值

     //input                                         iavs_byteenable         //字节使能信号

     //hardware interface(Conduit End)

     output  reg                                 oLCD1602_RS            ,//

     output  reg                                 oLCD1602_RW            ,//

     output  reg                                 oLCD1602_EN            ,//

     output  reg                     [ :]         oLCD1602_DAT         //

 );

 //-------------------------------------------------------------------------------

 wire            oLCD1602_RS_N    ;//

 wire         oLCD1602_RW_N    ;//

 wire          oLCD1602_EN_N    ;//

 wire  [:]  oLCD1602_DAT_N    ;//    

 //LCD1602_RS

 always@(posedge icsi_clk or negedge ireset_n)begin

     if(!ireset_n)

         oLCD1602_RS <= 'h0;

     else

         oLCD1602_RS <= oLCD1602_RS_N    ;//

 end

 assign oLCD1602_RS_N = ((iavs_write && iavs_chipselect) && (iavs_address == 'h0)) ? iavs_writedata[0] : oLCD1602_RS;

 //LCD1602_RW

 always@(posedge icsi_clk or negedge ireset_n)begin

     if(!ireset_n)

         oLCD1602_RW <= 'h0;

     else

         oLCD1602_RW <= oLCD1602_RW_N    ;//

 end

 assign oLCD1602_RW_N = ((iavs_write && iavs_chipselect) && (iavs_address == 'h1)) ? iavs_writedata[0] : oLCD1602_RW;

 //LCD1602_EN

 always@(posedge icsi_clk or negedge ireset_n)begin

     if(!ireset_n)

         oLCD1602_EN <= 'h0;

     else

         oLCD1602_EN <= oLCD1602_EN_N    ;//

 end

 assign oLCD1602_EN_N = ((iavs_write && iavs_chipselect) && (iavs_address == 'h2)) ? iavs_writedata[0] : oLCD1602_EN;

 //LCD1602_DAT

 always@(posedge icsi_clk or negedge ireset_n)begin

     if(!ireset_n)

         oLCD1602_DAT <= 'h0;

     else

         oLCD1602_DAT <= oLCD1602_DAT_N    ;//

 end

 assign oLCD1602_DAT_N = ((iavs_write && iavs_chipselect) && (iavs_address == 'h3)) ? iavs_writedata[7:0] : oLCD1602_DAT;

 //-------------------------------------------------------------------------------

 endmodule 

 /*********************************************************************************

 * Company                   :

 * Engineer                  : 空气微凉

 *

 * Create Date               : 00:00:00 22/03/2013

 * Design Name               :

 * Module Name               :

 * Project Name              :

 * Target Devices            :

 * Tool versions             :

 * Description               :

 *

 * Dependencies              :

 *

 * Revision                  :

 * Revision                  : 0.01 - File Created

 * Additional Comments       :

 ********************************************************************************/

 #include <stdio.h>

 #include <string.h>

 #include "system.h"

 #include "altera_avalon_pio_regs.h"

 #include "alt_types.h"

 #include "unistd.h"

 #define LCD_RS(data)       IOWR(OLCD1602_BASE, 0, data)

 #define LCD_RW(data)       IOWR(OLCD1602_BASE, 1, data)

 #define LCD_EN(data)       IOWR(OLCD1602_BASE, 2, data)

 #define LCD_DATA(data)     IOWR(OLCD1602_BASE, 3, data)

 //#define    LCD1602_ADDR    (OLCD1602_BASE | (1<<31))

 //#define    LCD_RS          (*(volatile unsigned int*)(LCD1602_ADDR + 0x00))

 //#define    LCD_RW          (*(volatile unsigned int*)(LCD1602_ADDR + 0x04))

 //#define    LCD_EN          (*(volatile unsigned int*)(LCD1602_ADDR + 0x08))

 //#define    LCD_DATA        (*(volatile unsigned int*)(LCD1602_ADDR + 0x0C))

 /*Write Command*/

 void Write_Com(alt_u8 com)

 {

     LCD_RS();//LCD_RS = 0;

     usleep();

     LCD_DATA(com);//LCD_DATA = com;

     usleep();

     LCD_EN();//LCD_EN = 1;

     usleep();

     LCD_EN();//LCD_EN = 0;

     usleep();

 }

 /*Write Data*/

 void Write_Data(alt_u8 data)

 {

     LCD_RS();// LCD_RS = 1;

     usleep();

     LCD_DATA(data);//LCD_DATA = data;

     usleep();

     LCD_EN();//LCD_EN = 1;

     usleep();

     LCD_EN();//LCD_EN = 0;

     usleep();

 }

 /*LCD 1602 Initialization*/

 void LCD_Init(void)

 {

     LCD_EN();// LCD_EN = 0;

     LCD_RW();//LCD_RW = 0;

     usleep();

     Write_Com(0x38);

     Write_Com(0x0C);

     Write_Com(0x06);

     Write_Com(0x01);

     Write_Com(0x80);

 }

 void LCD_Display(alt_u8 row, alt_u8 col, alt_u8 *pCN)

 {

     alt_u8    i, addr;

     if(row == )

         addr = 0x80 + col;

     else

         addr = 0xC0 + col;

     Write_Com(addr);

     //while(*(pCN) != '\0')

     for(i=; i<strlen(pCN); i++)

     {

         Write_Data(*(pCN+i));

     }

 }

 int main(void)

 {

     LCD_Init();

     LCD_Display(,,(alt_u8*)"Avalon-MM IP2012");

     LCD_Display(,,(alt_u8*)" Made By Na Xia");

     while()

     {

     }

 }