main.c

lcd1602的LPC2131程序,已经测试通过

/****************************************Copyright (c)**************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			main.c
** Last modified Date:  2004-09-16
** Last Version:		1.0
** Descriptions:		The main() function example template
**
**------------------------------------------------------------------------------------------------------
** Created by:			Chenmingji
** Created date:		2004-09-16
** Version:				1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************/
#include "config.h"

unsigned char LCM_Data = 0xFF; 
#define LCM_RS  1<<14
#define LCM_RW  1<<16
#define LCM_E   1<<18
#define LED     1<<20

void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM, unsigned char BuysC);
unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
void LCMInit(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char  *DData);
void Delay5Ms(void);
void Delay400Ms(void);
void IOInit(void);

unsigned char dle_net[] = {"**Easy_ARM2131**"};
unsigned char mail[] =    {"www.mcu123.com"};


int main (void)
{
IOInit(); 
LCMInit(); //LCM初始化
while(1)
{
DisplayListChar(0,0,dle_net);
DisplayListChar(0,1,mail);
}
}
//写数据
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //检测忙
IO0SET=LCM_RS ;
IO0CLR=LCM_RW ;
IO0CLR=LCM_Data;   
IO0SET=WDLCM;
Delay5Ms(); 
IO0CLR=LCM_E ; //若晶振速度太高可以在这后加小的延时 
Delay5Ms();
IO0SET=LCM_E ;
}

//写指令
void WriteCommandLCM(unsigned char WCLCM, unsigned char BuysC)
{
if (BuysC) ReadStatusLCM(); //根据需要检测忙
IO0CLR=LCM_RS ;
IO0CLR=LCM_RW ;
IO0CLR=LCM_Data;
IO0SET=WCLCM; 
Delay5Ms(); 
IO0CLR=LCM_E ; 
Delay5Ms();
IO0SET=LCM_E ;
}

//读数据
unsigned char ReadDataLCM(void)
{
IO0SET=LCM_RS ; 
IO0SET=LCM_RW ;
IO0CLR=LCM_E ;
Delay5Ms();
IO0SET=LCM_E ;
return(IO0SET&0XFF);
}

//读状态
unsigned char ReadStatusLCM(void)
{
IO0SET=LCM_Data;
IO0CLR=LCM_RS ;
IO0SET=LCM_RW ;
IO0CLR=LCM_E ;
Delay5Ms();
IO0SET|=LCM_E ;
return(IO0SET&0XFF);
}
//LCM初始化
void LCMInit(void) 
{
IO0CLR=LCM_Data ;
WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
WriteCommandLCM(0x38,0);
WriteCommandLCM(0x38,0);
WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
WriteCommandLCM(0x08,1); //关闭显示
WriteCommandLCM(0x01,1); //显示清屏
WriteCommandLCM(0x06,1); // 显示光标移动设置
WriteCommandLCM(0x0C,1); // 显示开及光标设置
}
//IO初始化
void IOInit(void)
{
PINSEL0=0X00000000;
IO0DIR=(LCM_Data|LCM_Data|LCM_RS|LCM_RW|LCM_E|LED) ;
IO0CLR=LED ;
}

//按指定位置显示一个字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
Y&= 0x1;
X&= 0xF; //限制X不能大于15，Y不能大于1
if(Y) X|=0x40;//当要显示第二行时地址码+0x40;
X|= 0x80; //算出指令码
WriteCommandLCM(X, 0); //这里不检测忙信号，发送地址码
WriteDataLCM(DData);
}

//按指定位置显示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char  *DData)
{
unsigned char ListLength;
ListLength = 0;
Y&=0x1;
X&=0xF; //限制X不能大于15，Y不能大于1
while (DData[ListLength]>0x20) //若到达字串尾则退出
{
if (X<= 0xF) //X坐标应小于0xF
{
DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
ListLength++;
X++;
}
}
}

//5ms延时
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}

//400ms延时
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA--)
{
TempCycB=7269;
while(TempCycB--);
}
}
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/