lcmmian.c

LCD1602的驱动

#include <reg51.h>   //头函数
#include<stdio.h>
#include<stdlib.h> 
#include<intrins.h>
#include<absacc.h>
sbit P1_4 = P1^4;
sbit P1_3 = P1^3;
sbit P1_5 = P1^5;
#define LCM_RW  P1_4   //定义引脚
#define LCM_RS  P1_3 
#define LCM_E   P1_5
#define LCM_Data  P2   //数据线
#define Busy    0x80 //用于检测LCM状态字中的Busy标识
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,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 code *DData);
void Delay5Ms(void);
void Delay400Ms(void);
//----------------------------------------------------------------------------------------------------//
       
unsigned char code uctech[]={"Win_belong_to"};
unsigned char code net[]={"Guo_Xiaoxin"};


void main(void)
{  
Delay400Ms(); //启动等待，等LCM讲入工作状态
LCMInit(); //LCM初始化
Delay5Ms(); //延时片刻(可不要)

DisplayListChar(0,0,uctech);
DisplayListChar(0,1,net);
ReadDataLCM();               
while(1);                        
}
//---------------------------------------------------------------------------------------------------//
//写数据
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //检测忙
LCM_Data = WDLCM;
LCM_RS = 1;
LCM_RW = 0;
LCM_E = 0;      //若晶振速度太高可以在这后加小的延时
LCM_E = 0;      //延时
LCM_E = 1;
}

//写指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
{
if (BuysC) ReadStatusLCM();    //根据需要检测忙
LCM_Data = WCLCM;
LCM_RS = 0;
LCM_RW = 0; 
LCM_E = 0;
LCM_E = 0;
LCM_E = 1; 
}

//读数据
unsigned char ReadDataLCM(void)
{
LCM_RS = 1; 
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
return(LCM_Data);
}

//读状态
unsigned char ReadStatusLCM(void)
{
LCM_Data = 0xFF; 
LCM_RS = 0;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
while (LCM_Data & Busy); //检测忙信号
return(LCM_Data);
}

void LCMInit(void) //LCM初始化
{
LCM_Data = 0;
WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
Delay5Ms(); 
WriteCommandLCM(0x38,0);
Delay5Ms(); 
WriteCommandLCM(0x38,0);
Delay5Ms(); 
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(0x0F,1); // 显示开及光标设置
}

//按指定位置显示一个字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)  
                                   //x表示列、y 表示行
{
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, 1);  //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 code *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,字符长度小于32
  {
   if (X <= 0xF)                //X坐标应小于0xF（15）
    {
     DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
     ListLength++;
     X++;
    }
  }
}


void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA--)
{
  TempCycB=7269;
  while(TempCycB--);
};   
}