lcm1602.c

来自「用单片机对lcm1602进行初始化显示“hello”」· C语言 代码 · 共 162 行

#include <reg51.h>
#define LCM_Data  P1
#define Busy 0x80 //用于检测LCM状态字中的Busy标识

unsigned char idata HelloBuffer[]={"Hello"} ;//{0x48,0x65,0x6c,0x6c,0x6f};
sbit LCM_RW = P2^0; //定义引脚
sbit LCM_RS = P2^1;
sbit LCM_E = P2^2 ;

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

//**********************************************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,BusyC) //BusyC为0时忽略忙检测
{
if (BusyC) 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;
Delay5Ms();
LCM_E = 1;
while (LCM_Data & Busy); //检测忙信号
return(LCM_Data);
}  
/*unsigned char ReadStatusLCM(void)
{
LCM_Data = 0xFF;
while(1)
{ 
 LCM_RS=0;
 LCM_RW = 1;
 LCM_E = 0;
 LCM_E = 0;
 LCM_E = 1;
 if(!Busy)
 break; //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();//Delay5Ms(); 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(0x0C,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 idata 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  idata* 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--);
};
}

void main(void)					 //采用12Mhz的时钟脉冲
{
  P1=0;
  Delay400Ms(); //启动等待，等LCM进入工作状态
  LCMInit();//初始化LCD
  DisplayListChar(3,0,HelloBuffer);//启动时的屏幕显示“Hello”
  Delay400Ms();
 // Delay400Ms();
 // Delay400Ms();
  WriteCommandLCM(0x07,1); 
 // WriteCommandLCM(0x01,1); //显示清屏
  while(1);
 }