Xilinx FPGA中使用LCD1602的方法

一、XPS中的設(shè)置

1.在XPS添加一個(gè)XPS General Purpose IO，并將其命名為“Char_LCD”。

注：這里的命名有一定的規(guī)則，將其命名為“Char_LCD”，是因?yàn)樵诤髞?lái)的C程序中調(diào)用LCD基地址的時(shí)候使用的名字為“XPAR_CHAR_LCD_BASEADDR”，如果將這個(gè)命名為其他的（比如XX），那么在下面的lcd.h中也要將
#define LCD_BASEADDR XPAR_CHAR_LCD_BASEADDR

這一句中的"CHAR_LCD"改成對(duì)應(yīng)的名稱。

2.配置Char_LCD中Channel 1的GPIO Data Channel Width為11并在Ports中設(shè)置為Connected to External Ports。

3.在System.ucf加入相應(yīng)的管教約束，這里提供Genesys Digilent開(kāi)發(fā)板中對(duì)應(yīng)的管腳約束，管腳的名稱自然而言和上面使用的名稱對(duì)應(yīng)。
#Char_LCD constraints
#Char_LCD_GPIO_IO_pin<0> corresponds to LCD_E
#Char_LCD_GPIO_IO_pin<1> corresponds to LCD_RS
#Char_LCD_GPIO_IO_pin<2> corresponds to LCD_RW
#Char_LCD_GPIO_IO_pin<3> corresponds to LCD_D7, <4> to LCD_D6... <10> to LCD_D0

二、SDK中的代碼模板

1.將lcd.h、lcd.c、sleep.h和sleep.c添加到工程的src文件夾中，并在需要調(diào)用LCD的代碼中添加
#include "lcd.h"

2.在使用LCD之前需要進(jìn)行初始化，添加下面代碼：
LCDOff();
LCDClear();
LCDOn();
LCDInit();

3.需要在LCD中顯示時(shí)，調(diào)用下面函數(shù)
LCDPrintString(First_Line, Second_Line; //First_Line和Second_Line都是char*類型

附件：博文中提到文件的源代碼：

1.lcd.h
/*******************************************************************************
*
* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
* SOLELY FOR USE IN DEVELOPING PROGRAMS AND SOLUTIONS FOR
* XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION
* AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION
* OR STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS
* IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
* AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
* FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY
* WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
* IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
* REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
* INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* (c) Copyright 2007 Xilinx, Inc.
* All rights reserved.
*
******************************************************************************/

#ifndef LCD_H
#define LCD_H

//=====================
// TEST FUNCTIONS
//=====================
void LCDTest();
void LCDTestMenu();
void LCDTestInput(char ch);

//=====================
// EXTERNAL FUNCTIONS
//=====================

#define LCD_BASEADDR XPAR_CHAR_LCD_BASEADDR //根據(jù)需要修改這里

void LCDOn();
void LCDOff();
void LCDClear();
void LCDInit();

void LCDEnableDisplayShift();
void LCDEnableCursorBlink();

void LCDDisableDisplayShift();
void LCDDisableCursorBlink();

void MoveCursorHome();
void MoveCursorRight();
void MoveCursorLeft();

void LCDSetLine(int line);
void LCDPrintChar(char c);
void LCDPrintString(char * line1, char * line2);

//=====================
// INTERNAL FUNCTIONS
//=====================
void InitInst(void);
void WriteInst(unsigned long inst1, unsigned long inst2);
void WriteData(unsigned long data1, unsigned long data2);
void WriteInst8(unsigned long inst);
void WriteData8(unsigned long data);

#endif

2.lcd.c
/******************************************************************************
*
* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
* AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
* SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE,
* OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
* APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
* THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
* AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
* FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY
* WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
* IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
* REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
* INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* (c) Copyright 2007 Xilinx Inc.
* All rights reserved.
*
******************************************************************************/